Mother liquor reduction controllable recovery equipment of vacuum crystallizer

Abstract

The utility model discloses mother liquor reduction controllable recovery equipment for a vacuum crystallizer, and relates to the technical field related to spinning material recovery. The crystallizer comprises a crystallizer main body, a circulating pipe and a tubular heat exchanger, the tubular heat exchanger is arranged on one side of the crystallizer main body, the circulating pipe is fixedly communicated with the top end of the tubular heat exchanger, a conveying pipe is fixedly communicated with the upper part of the peripheral side of the circulating pipe, and a liquid recycling pipe is fixedly communicated with the bottom end of the tubular heat exchanger. By arranging the crystallizer main body, the circulating pipe and the tubular heat exchanger, the problems that invalid mother liquor is easily generated when a vacuum crystallizer removes crystal scars, and sodium sulfate solution generated by recovering crystals after crystallization is directly discharged, so that pollution is generated, and sodium sulfate is wasted are solved; the utility model has the advantages that the vacuum crystallizer does not generate invalid mother liquor when removing crystal scars, and a sodium sulfate solution for recovering crystals after crystallization can also be circulated to equipment for sodium sulfate crystallization production.

Description

Technical Field

[0001] The utility model belongs to the technical field related to spinning material recovery, in particular to a vacuum crystallizer mother liquor reduction controllable recovery device. Background Art

[0002] Cellulose is a macromolecular polysaccharide composed of glucose. It is insoluble in water and general organic solvents and is the main component of plant cell walls. Cellulose is the most widely distributed and abundant polysaccharide in nature, accounting for more than 50% of the carbon content in the plant kingdom. The cellulose content of cotton is close to 100%, which is the purest natural source of cellulose. In the cellulose manufacturing process, the sodium sulfate produced in the spinning process needs to be removed and recycled by a vacuum crystallizer, but it still has the following disadvantages in actual use:

[0003] During operation, when the vacuum crystallizer is running, "crystal scar blockage" will occur in the crystallizer after 40-50 hours of continuous operation, causing abnormal operation of the equipment. After the equipment needs to be shut down, the external device supplies acid, which enters the crystallizer to dissolve the crystal scar and make the equipment work normally again. However, after the external device supplies acid, the invalid mother liquor generated by the circulation of the crystal scar in the equipment can only be discharged directly, resulting in waste of mother liquor.

[0004] When the sodium sulfate crystals are crystallized in the vacuum crystallizer, they will be mixed with a part of the saturated sodium sulfate solution to facilitate its flow and transportation to the centrifugal drying equipment. In the centrifugal drying equipment, this part of the solution will be centrifuged out and processed. This part of the sodium sulfate solution not only needs to be processed, but also will produce sodium sulfate waste after discharge. Utility Model Content

[0005] The utility model aims to provide a mother liquor reduction and controllable recovery device for a vacuum crystallizer. By arranging a crystallizer main body, a circulation pipe and a shell-and-tube heat exchanger, the problem that invalid mother liquor is easily generated when the vacuum crystallizer removes crystal scars is solved, and the sodium sulfate solution generated by the recovered crystals after crystallization is directly discharged, which not only causes pollution but also causes waste of sodium sulfate.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model is a vacuum crystallizer mother liquor reduction controllable recovery device, comprising a crystallizer main body, a circulation pipe and a shell-and-tube heat exchanger, wherein a shell-and-tube heat exchanger is arranged on one side of the crystallizer main body, the top of the shell-and-tube heat exchanger is fixedly connected with a circulation pipe, the upper part of the circumference of the circulation pipe is fixedly connected with a delivery pipe, the circumference of the circulation pipe above and below the delivery pipe is fixedly provided with an electric control valve 2, the bottom end of the shell-and-tube heat exchanger is fixedly connected with a recovery liquid pipe, when working, the sodium sulfate solution entering the crystallizer main body is crystallized, the sodium sulfate solution is delivered to the delivery pipe through the circulation pipe, delivered to the delivery pump through the delivery pipe, delivered to the crystallizer main body through the delivery pump, the sodium sulfate solution passing through the crystallizer main body is heated by steam through the shell-and-tube heat exchanger, and when the heated sodium sulfate solution enters the crystallizer main body, the crystal scars crystallized in the crystallizer main body are dissolved and removed.

[0008] Furthermore, the output end of the crystallizer body is fixedly connected to an output pipe, and the peripheral side of the output pipe is fixedly connected to an electrically controlled valve 1. The crystallizer discharges the crystallized sodium sulfate and the solution together through the output pipe, and the output pipe is controlled to be on and off by the electrically controlled valve 1.

[0009] Furthermore, a delivery pump is fixed on the top of the crystallizer body, the output end of the delivery pump is connected to the crystallizer body, and the end of the delivery pipe away from the circulation pipe is fixedly connected to the input end of the delivery pump, and the sodium sulfate solution transported in the delivery pipe is pumped into the crystallizer body through the delivery pump.

[0010] Furthermore, a lower steam pipe is fixedly connected to the lower part of the circumferential side of the shell-and-tube heat exchanger, and an upper steam pipe is fixedly connected to the upper part of the circumferential side of the shell-and-tube heat exchanger. The lower steam pipe and the upper steam pipe are both arranged on the circumferential side of the shell-and-tube heat exchanger away from the crystallizer body. An electric control valve three is fixed to the circumferential side of the recovery liquid pipe. The shell-and-tube heat exchanger transports steam for heating the sodium sulfate solution passing therethrough into the shell-and-tube heat exchanger through the upper steam pipe, and after heating the sodium sulfate solution in the shell-and-tube heat exchanger, the steam is discharged through the lower steam pipe.

[0011] Furthermore, a circulation nozzle is fixedly connected to the lower part of the peripheral side of the crystallizer body, and an output nozzle is fixedly connected to the lower part of the peripheral side of the shell-and-tube heat exchanger near the position of the crystallizer body. The crystallizer body is connected to the connecting pipe through the circulation nozzle, and the shell-and-tube heat exchanger is connected to the connecting pipe through the output nozzle.

[0012] Furthermore, the end of the circulation nozzle away from the crystallizer body and the end of the output nozzle away from the shell-and-tube heat exchanger are fixedly connected to each other by a connecting pipe, and an electric control valve four is fixed on the peripheral side of the connecting pipe, and the connecting pipe is controlled to be on and off by the electric control valve four.

[0013] The utility model has the following beneficial effects:

[0014] The utility model solves the problem that invalid mother liquor is easily generated when removing crystal scars from a vacuum crystallizer by arranging a crystallizer main body, a circulation pipe and a shell-and-tube heat exchanger. When crystal scars are generated in the crystallizer main body, the second electric control valve above the delivery pipe is closed, the first electric control valve is closed, and the second electric control valve below the delivery pipe is opened, and the fourth electric control valve is opened. At this time, the sodium sulfate solution retained in the crystallizer main body is transported to through the connecting pipe, and the high-temperature and high-pressure steam is transported to the shell-and-tube heat exchanger through the upper steam pipe, so that the sodium sulfate solution passing through the shell-and-tube heat exchanger is heated to increase the efficiency. The solubility of the solution in sodium sulfate is transported to the circulation pipe at the same time, and then transported to the delivery pipe, and then pumped to the crystallizer body through the delivery pump to dissolve the crystal scar generated in the crystallizer body and remove the crystal scar in the crystallizer body. After completion, open the electric control valve 2 above the delivery pipe, open the electric control valve 1, and at the same time close the electric control valve 2 below the delivery pipe, close the electric control valve 4, and restore the normal crystallization operation of the crystallizer body. When the vacuum crystallizer removes the crystal scar, the original mother liquor is heated up to increase the solubility and dissolve the crystal scar, thereby reducing the generation of invalid mother liquor.

[0015] The utility model solves the problem that the sodium sulfate solution generated by the recovered crystals after the vacuum crystallizer is crystallized by directly discharging the sodium sulfate solution, which not only causes pollution but also causes the waste of sodium sulfate, by arranging a shell-and-tube heat exchanger. During operation, after the sodium sulfate is recovered, the excess sodium sulfate solution is transported to the recovery liquid pipe through the output pipeline of the recovery system in the heat cycle of removing crystal scars, and the electric control valve three is opened, so that the excess sodium sulfate solution in the recovery system enters the crystallizer body along with the sodium sulfate solution in the heat cycle of the crystallizer to remove crystal scars, and the excess sodium sulfate solution in the recovery system is recovered, thereby reducing the waste of sodium sulfate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A three-dimensional diagram of the assembly structure of a vacuum crystallizer mother liquor reduction and controllable recovery device;

[0018] Figure 2 This is a three-dimensional diagram of the main structure of the crystallizer;

[0019] Figure 3 It is a three-dimensional diagram of the circulation pipe structure;

[0020] Figure 4 It is a three-dimensional diagram of the structure of a shell and tube heat exchanger;

[0021] Figure 5It is a three-dimensional diagram of the connecting pipe structure.

[0022] Reference numerals:

[0023] 1. Crystallizer body; 101. Circulation nozzle; 102. Output pipe; 103. Electric control valve 1; 2. Circulation pipe; 201. Delivery pipe; 202. Electric control valve 2; 203. Delivery pump; 3. Shell-and-tube heat exchanger; 301. Upper steam pipe; 302. Lower steam pipe; 303. Output nozzle; 304. Recovery liquid pipe; 305. Electric control valve 3; 4. Connecting pipe; 401. Electric control valve 4. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment 1

[0025] See also Figure 1-5 The utility model is a vacuum crystallizer mother liquor reduction controllable recovery device, comprising a crystallizer body 1, a circulation pipe 2 and a shell-and-tube heat exchanger 3. The shell-and-tube heat exchanger 3 is arranged on one side of the crystallizer body 1. When the crystallizer body 1 is working, the sodium sulfate solution entering therein is recrystallized, and the circulating sodium sulfate solution entering therein is heated by the shell-and-tube heat exchanger 3. The top of the shell-and-tube heat exchanger 3 is fixedly connected with the circulation pipe 2, and the upper part of the surrounding side of the circulation pipe 2 is fixedly connected with the conveying pipe 201. The surrounding sides of the circulation pipe 2 above and below the conveying pipe 201 are fixed with electric control valves 202. The circulation pipe 2 is connected with the shell-and-tube heat exchanger 3 through the bottom end, and the top end is connected with the external pipeline for conveying the sodium sulfate solution to be crystallized, so that When working, when the electric control valve 202 above the delivery pipe 201 is opened and the electric control valve 202 below the delivery pipe 201 is closed, the external pipeline for delivering the sodium sulfate solution to be crystallized directly delivers the sodium sulfate solution to be crystallized to the circulation pipe 2, and delivers it to the delivery pipe 201 through the circulation pipe 2. When the electric control valve 202 above the delivery pipe 201 is closed and the electric control valve 202 below the delivery pipe 201 is opened, the sodium sulfate solution heated in the shell-and-tube heat exchanger 3 is delivered to the delivery pipe 201. The bottom end of the shell-and-tube heat exchanger 3 is fixedly connected with a recovery liquid pipe 304, and the recovery liquid pipe 304 is connected to the output end of the recovery system, so that the excess sodium sulfate solution in the sodium sulfate recovery system is delivered to the shell-and-tube heat exchanger 3.

[0026] Specifically, the output end of the crystallizer body 1 is fixedly connected to an output pipe 102, and the peripheral side of the output pipe 102 is fixedly connected to an electric control valve 103. The crystallizer body 1 outputs the liquid therein to the separation device through the output pipe 102, and the delivery on and off of the output pipe 102 is controlled by the electric control valve 103.

[0027] Furthermore, a delivery pump 203 is fixed at the top of the crystallizer body 1, the output end of the delivery pump 203 is connected to the crystallizer body 1, and the end of the delivery pipe 201 away from the circulation pipe 2 is fixedly connected to the input end of the delivery pump 203, and the sodium sulfate solution transported in the delivery pipe 201 is pumped into the crystallizer body 1 through the delivery pump 203.

[0028] Furthermore, a circulation nozzle 101 is fixedly connected to the lower part of the peripheral side of the crystallizer main body 1, and an output nozzle 303 is fixedly connected to the lower part of the peripheral side of the shell-and-tube heat exchanger 3 near the position of the crystallizer main body 1. The crystallizer main body 1 is connected to the connecting pipe 4 through the circulation nozzle 101, and the shell-and-tube heat exchanger 3 is connected to the connecting pipe 4 through the output nozzle 303.

[0029] Furthermore, the circulation nozzle 101 away from one end of the crystallizer body 1 and the output nozzle 303 away from one end of the shell-and-tube heat exchanger 3 are fixedly connected with a connecting pipe 4, and an electric control valve 401 is fixed on the peripheral side of the connecting pipe 4. The lower peripheral part of the shell-and-tube heat exchanger 3 and the lower peripheral part of the crystallizer body 1 are connected through the connecting pipe 4, so that the sodium sulfate solution heated for removing crystal scars can be circulated.

[0030] The operation process of this embodiment is as follows: during operation, when the crystallizer main body 1 is working continuously, the electric control valve 202 above the delivery pipe 201 is opened, and the electric control valve 202 below the delivery pipe 201 is closed, and the external pipeline for delivering the sodium sulfate solution to be crystallized directly delivers the sodium sulfate solution to be crystallized to the circulation pipe 2, and delivers it to the delivery pipe 201 through the circulation pipe 2, and delivers the sodium sulfate solution to the crystallizer main body 1 through the delivery pump 203 to perform crystallization operation. When a crystal scar is generated in the crystallizer main body 1, the electric control valve 202 above the delivery pipe 201 is closed, the electric control valve 103 is closed, and the electric control valve 202 below the delivery pipe 201 is opened at the same time, and the electric control valve 401 is opened. At this time, the crystallizer main body 1 The retained sodium sulfate solution is transported through the connecting pipe 4, and the high-temperature and high-pressure steam is transported to the shell-and-tube heat exchanger 3 through the upper steam pipe 301, the sodium sulfate solution passing through the shell-and-tube heat exchanger 3 is heated to increase the solubility of the solution in sodium sulfate, and at the same time it is transported to the circulation pipe 2, and then transported to the delivery pipe 201, and pumped to the crystallizer body 1 through the delivery pump 203, the crystal scar generated in the crystallizer body 1 is dissolved, and the crystal scar in the crystallizer body 1 is removed. After completion, open the electric control valve 202 above the delivery pipe 201, open the electric control valve 103, and at the same time close the electric control valve 202 below the delivery pipe 201, close the electric control valve 401, and restore the normal crystallization operation of the crystallizer body 1. Specific embodiment 2

[0031] See also Figure 1 , 4 On the basis of the specific embodiment 1, a lower steam pipe 302 is fixedly connected to the lower part of the peripheral side of the shell-and-tube heat exchanger 3, and the lower steam pipe 302 is connected to the pipeline for reflux high-pressure steam and condensed water. An upper steam pipe 301 is fixedly connected to the upper part of the peripheral side of the shell-and-tube heat exchanger 3, and the upper steam pipe 301 is connected to the pipeline for conveying high-pressure steam. The lower steam pipe 302 and the upper steam pipe 301 are both arranged away from the crystallizer body 1 on the peripheral side of the shell-and-tube heat exchanger 3. An electric control valve 3 305 is fixed to the peripheral side of the recovery liquid pipe 304. When the shell-and-tube heat exchanger 3 is working, the high-temperature and high-pressure steam is conveyed to the shell-and-tube heat exchanger 3 through the upper steam pipe 301, and the sodium sulfate solution passing through the shell-and-tube heat exchanger 3 is heated to increase the solubility of the solution in sodium sulfate.

[0032] The operation process of this embodiment is as follows: when working, after sodium sulfate is recovered, the excess sodium sulfate solution is transported to the recovery liquid pipe 304 through the output pipe 102 of the recovery system in the thermal cycle of removing crystal scars, and the electric control valve 305 is opened, so that the excess sodium sulfate solution in the recovery system enters the crystallizer body 1 as the sodium sulfate solution removes crystal scars in the crystallizer thermal cycle, and the excess sodium sulfate solution in the recovery system is recovered to reduce the waste of sodium sulfate.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A vacuum crystallizer mother liquor reduction and controllable recovery device, comprising a crystallizer body (1), a circulation pipe (2) and a shell-and-tube heat exchanger (3), characterized in that: A shell-and-tube heat exchanger (3) is provided on one side of the crystallizer body (1); the top end of the shell-and-tube heat exchanger (3) is fixedly connected to a circulation pipe (2); the upper part of the circumferential side of the circulation pipe (2) is fixedly connected to a delivery pipe (201); the circumferential sides of the circulation pipe (2) above and below the delivery pipe (201) are both fixedly connected to electric control valves 2 (202); and the bottom end of the shell-and-tube heat exchanger (3) is fixedly connected to a recovery liquid pipe (304).

2. A vacuum crystallizer mother liquor reduction and controllable recovery device according to claim 1, characterized in that: The output end of the crystallizer body (1) is fixedly connected to an output pipe (102), and the peripheral side of the output pipe (102) is fixedly connected to an electric control valve 1 (103).

3. A vacuum crystallizer mother liquor reduction and controllable recovery device according to claim 1, characterized in that: A delivery pump (203) is fixed at the top of the crystallizer body (1); the output end of the delivery pump (203) is connected to the crystallizer body (1); and the end of the delivery pipe (201) away from the circulation pipe (2) is fixedly connected to the input end of the delivery pump (203).

4. The vacuum crystallizer mother liquor reduction and controllable recovery device according to claim 1 is characterized in that: A lower steam pipe (302) is fixedly connected to the lower part of the circumferential side of the shell-and-tube heat exchanger (3), and an upper steam pipe (301) is fixedly connected to the upper part of the circumferential side of the shell-and-tube heat exchanger (3). The lower steam pipe (302) and the upper steam pipe (301) are both arranged on the circumferential side of the shell-and-tube heat exchanger (3) away from the crystallizer body (1), and an electric control valve three (305) is fixed to the circumferential side of the recovery liquid pipe (304).

5. The vacuum crystallizer mother liquor reduction and controllable recovery equipment according to claim 1 is characterized in that: A circulation nozzle (101) is fixedly connected to the lower part of the peripheral side of the crystallizer body (1), and an output nozzle (303) is fixedly connected to the lower part of the peripheral side of the shell-and-tube heat exchanger (3) near the crystallizer body (1).

6. A vacuum crystallizer mother liquor reduction and controllable recovery device according to claim 5, characterized in that: The end of the circulation nozzle (101) away from the crystallizer body (1) and the end of the output nozzle (303) away from the shell-and-tube heat exchanger (3) are fixedly connected to a connecting pipe (4), and an electric control valve four (401) is fixed on the peripheral side of the connecting pipe (4).

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