Device for preventing alkali content from exceeding standard in reuse of flash evaporator evaporated light alkali condensate water

Abstract

The utility model relates to the field of light alkali concentration of printing and dyeing enterprises, in particular to a device for preventing alkali content from exceeding standard during recycling of light alkali condensed water evaporated by a flash evaporator, which comprises a condensed water collecting device and a condensed alkali content automatic detection and control device. Waste of resources is reduced, and energy conservation and emission reduction are promoted. By automatically detecting and controlling the alkali content of the condensate water, equipment faults in production are eliminated in time, the alkali content of the condensate water recycling tank is effectively prevented from exceeding the standard, and the reworking phenomenon in work is reduced.

Description

Technical Field

[0001] The utility model relates to the field of diluted alkali concentration in printing and dyeing enterprises, and in particular to a device for preventing excessive alkali content in reused diluted alkali condensed water from an expansion evaporator. Background Art

[0002] In order to save energy and reduce emissions, and reduce the amount of caustic soda (NaOH), printing and dyeing enterprises are equipped with expansion evaporators for concentrated caustic soda. The working principle of the expansion evaporator is to use superheated caustic soda to flash evaporation to concentrate the caustic soda. Under normal circumstances, the expansion evaporator will discharge condensed water with an alkali content of less than or equal to 0.05 grams per liter and a temperature of about 60 degrees when concentrating the caustic soda. This part of condensed water has a very small alkali content and can be used for desizing and oxygen bleaching water washing water before printing and dyeing.

[0003] However, during initial start-up, changes in process conditions, equipment failure, etc., the expanded evaporator may experience alkali backflow, leakage of alkali from the condenser tubes and end plates into the condensate, increasing the alkali content in the production condensate tank, thereby causing the semi-finished products to be reworked before printing and dyeing. To prevent the condensate from exceeding the alkaline content and causing rework accidents, the operators of the expanded evaporator often discharge the dilute alkaline condensate into the sewage ditch without recycling it, resulting in a waste of water resources and heat energy. Utility Model Content

[0004] In view of the above problems, the utility model provides a device for preventing the alkali content of reused condensed water from expanded evaporators from exceeding the standard, which realizes automatic detection and control of the alkali content of condensed water, effectively prevents the alkali content of the condensed water recovery tank from exceeding the standard and reduces resource waste.

[0005] A device for preventing excessive alkali content in reused condensed water from dilute alkaline evaporator, comprising: a condensed water tank, the condensed water tank is connected to a condensed water pump through a first pipe, the condensed water pump is connected to an inlet of a pneumatic three-way valve through a second pipe, a first outlet of the pneumatic three-way valve is connected to a condensed water recovery tank through a third pipe, a second outlet of the pneumatic three-way valve is connected to a drainage pipe, a branch pipe is provided on the second pipe and connected to the bottom of a condensed water detection box, a first valve is provided on the branch pipe, a pH value detection probe is provided above the condensed water detection box, a lower end of the pH value detection probe extends into the bottom of the condensed water detection box, and an upper end is connected to a pH value controller, an output end of the pH value controller is connected to a solenoid valve, an inlet and an outlet of the solenoid valve are connected to an air pressure pipeline, and the air pressure pipeline at the outlet of the solenoid valve is connected to the pneumatic three-way valve.

[0006] Preferably, a second valve is provided on the first pipeline.

[0007] Preferably, a check valve is provided on the second pipeline.

[0008] Preferably, an overflow pipe is provided at the high water level of the condensate water detection box, and the bottom of the condensate water detection box is connected to the drainage pipe through a third valve.

[0009] Preferably, the pH value controller is also provided with a signal bell.

[0010] Preferably, the condensate recovery tank is connected to the water supply pipeline through a fourth valve.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model reduces the consumption of caustic soda, reduces the waste of resources, and promotes energy conservation and emission reduction by recycling the condensed water of dilute alkali evaporated by the expansion evaporator.

[0013] 2. The utility model timely eliminates equipment failures in production through automatic detection and control of the alkali content of condensed water, effectively prevents the alkali content of the condensed water recovery box from exceeding the standard, and reduces rework during work. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] In the figure: 1. condensate tank; 2. first pipeline; 3. condensate pump; 4. second pipeline; 5. pneumatic three-way valve; 51. first outlet; 52. second outlet; 6. third pipeline; 7. condensate recovery tank; 8. drainage pipeline; 9. branch pipe; 10. condensate detection tank; 11. first valve; 12. pH value detection probe; 13. pH value controller; 14. solenoid valve; 15. air compressor pipeline; 16. second valve; 17. check valve; 18. overflow pipe; 19. third valve; 20. signal bell; 21. fourth valve; 22. water supply pipeline. DETAILED DESCRIPTION

[0016] 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 in 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.

[0017] Reference Figure 1In an embodiment of the utility model, a device for preventing excessive alkali content of reused condensed water from dilute alkali in an expansion evaporator includes a condensed water tank 1, the condensed water tank 1 is connected to a condensed water pump 3 through a first pipe 2, the condensed water pump 3 is connected to an inlet of a pneumatic three-way valve 5 through a second pipe 4, a first outlet 51 of the pneumatic three-way valve 5 is connected to a condensed water recovery tank 7 through a third pipe 6, a second outlet 52 of the pneumatic three-way valve 5 is connected to a drainage pipe 8, a branch pipe 9 is provided on the second pipe 4 to communicate with a condensed water detection box 10, a first valve 11 is provided on the branch pipe 9, a pH value detection probe 12 is provided above the condensed water detection box 10, and the lower end of the pH value detection probe 12 extends into the bottom of the condensed water detection box 10, in order to ensure that the pH value detection probe 12 will not be cut off during detection and affect the detection result, the upper end is connected to a pH value controller 13, the output end of the pH value controller 13 is connected to a solenoid valve 14, the inlet and outlet of the solenoid valve 14 are connected to an air pressure pipe 15, and the air pressure pipe 15 is connected to the pneumatic three-way valve 5 at the outlet of the solenoid valve 14.

[0018] In order to more conveniently control the recovery of condensed water, a second valve 16 is provided on the first pipeline 2 .

[0019] In order to prevent the condensed water in the second pipe 4 from flowing back, a check valve 17 is provided on the second pipe 4 .

[0020] In order to prevent the condensed water in the condensed water detection box 10 from overflowing, an overflow pipe 18 is provided at the high water level of the condensed water detection box 10. When the detection is completed, in order to facilitate the discharge of the condensed water in the condensed water detection box 10, the bottom of the condensed water detection box 10 is connected to the drainage pipe 8 through a third valve 19.

[0021] In order to facilitate the staff to handle the fault in time, the pH value controller 13 is also provided with a signal bell 20.

[0022] In order to reuse the condensed water in the condensed water recovery tank 7 , the condensed water recovery tank 7 is connected to the workshop water supply pipeline 22 through the fourth valve 21 .

[0023] When working, the second valve 16 is opened, and the condensed water flows from the condensed water tank 1 through the first pipeline 2 and the condensed water pump 3 to the second pipeline 4, and then enters the pneumatic three-way valve 5 after passing through the check valve 17 of the second pipeline 4; when testing, the first valve 11 is opened, and the condensed water sample to be tested enters the condensed water testing box 10, and the alkali content of the condensed water sample to be tested is tested by the pH value detection probe 12 and the pH value controller 13. When the alkalinity content of the condensed water is within the set pH value range, the pH value controller 13 controls the pneumatic three-way valve 5 through the solenoid valve 14. The first outlet 51 is opened, and the condensed water entering the pneumatic three-way valve 5 flows into the condensed water recovery tank 7; when the alkali content of the condensed water exceeds the set pH value range, the pH value controller 13 controls the second outlet 52 of the pneumatic three-way valve 5 to open through the solenoid valve 14, and discharges the condensed water entering the pneumatic three-way valve 5 into the drainage pipe 8 to wait for subsequent processing. At the same time, the pH value controller 13 links the signal bell 20 to send out an alarm signal. After seeing or hearing the alarm signal, the staff will check the fault as soon as possible. If the fault cannot be eliminated, the station will be stopped and maintenance personnel will be asked to handle it.

[0024] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for preventing excessive alkali content in condensed water from dilute alkali in an expansion evaporator, comprising a condensed water tank (1), characterized in that: The condensate tank (1) is connected to the condensate pump (3) via a first pipe (2); the condensate pump (3) is connected to an inlet of a pneumatic three-way valve (5) via a second pipe (4); a first outlet (51) of the pneumatic three-way valve (5) is connected to a condensate recovery tank (7) via a third pipe (6); a second outlet (52) of the pneumatic three-way valve (5) is connected to a drainage pipe (8); a branch pipe (9) is provided on the second pipe (4) and is connected to the bottom of a condensate detection tank (10); the branch pipe ( 9) is provided with a first valve (11), a pH value detection probe (12) is provided above the condensate detection box (10), the lower end of the pH value detection probe (12) extends into the bottom of the condensate detection box (10), and the upper end is connected to the pH value controller (13), the output end of the pH value controller (13) is connected to the solenoid valve (14), the inlet and outlet of the solenoid valve (14) are connected to the air pressure pipeline (15), and the air pressure pipeline (15) at the outlet of the solenoid valve (14) is connected to the pneumatic three-way valve (5).

2. The device for preventing excessive alkali content in reused condensed water from dilute alkali evaporated by an expansion evaporator according to claim 1, characterized in that: A second valve (16) is provided on the first pipeline (2).

3. The device for preventing excessive alkali content in reused condensed water from dilute alkali evaporated by an expansion evaporator according to claim 2, characterized in that: The second pipeline (4) is provided with a check valve (17).

4. The device for preventing excessive alkali content in reused condensed water from dilute alkali evaporated by an expansion evaporator according to claim 3, characterized in that: An overflow pipe (18) is provided at the high water level of the condensate detection box (10), and the bottom of the condensate detection box (10) is connected to the drainage pipe (8) via a third valve (19).

5. The device for preventing excessive alkali content in reused condensed water from dilute alkali evaporated by an expansion evaporator according to claim 4, characterized in that: The pH value controller (13) is also provided with a signal bell (20).

6. The device for preventing excessive alkali content in reused condensed water from dilute alkali evaporated by an expansion evaporator according to claim 5, characterized in that: The condensate recovery tank (7) is connected to the water supply pipeline (22) via a fourth valve (21).

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