Vacuum low-temperature water preparation system

Abstract

The utility model relates to the technical field of low-temperature water preparation, in particular to a vacuum low-temperature water preparation system, which comprises a flash kettle, an alkali absorption tower and a water cooling unit, the flash kettle is connected with a water inlet pipe and a low-temperature water collecting pipe, the flash kettle is connected with the alkali absorption tower, and the alkali absorption tower is respectively connected with a concentrated alkali liquor input pipe and a dilute alkali liquor output pipe. The top end of the alkali absorption tower is connected with a water cooling unit, the water cooling unit is connected with a water ring vacuum pump, and the water ring vacuum pump is connected with a non-condensable gas discharge pipe. Low-temperature water is prepared through a flash evaporation method, the process route is optimized, the alkali absorption tower and the water cooling unit are used for absorbing flash steam and removing heat released by flash steam condensation and sodium hydroxide solution dilution, low-temperature water and a low-concentration sodium hydroxide solution are prepared at the same time, and the system is simple in overall structure, good in using effect and low in cost. And resource utilization, energy conservation and emission reduction can be effectively realized.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature water preparation, in particular to a vacuum low-temperature water preparation system. Background Art

[0002] Vacuum flash evaporation technology is a green chemical process that is used in fluorine chemical industry, viscose fiber, pharmaceutical chemical industry and other fields. The use of vacuum flash evaporation technology to prepare low-temperature water is to use room temperature water to enter a high vacuum container. Due to the sudden drop in pressure, part of the water is evaporated, and a large amount of heat is absorbed during evaporation, thereby lowering the temperature of the water and producing low-temperature water.

[0003] Typically, the flash steam generated when producing low-temperature water is not effectively utilized and is often directly discharged into the atmosphere. As a result, a large amount of flash steam mist can be seen directly discharged in many enterprises, which not only leads to a large waste of resources but also has a certain impact on the environment. In addition, low-concentration sodium hydroxide solutions are often required in the daily production of fluorine chemical and pharmaceutical companies. They are usually produced directly by diluting high-concentration sodium hydroxide solutions, which further consumes a large amount of resources. Therefore, a system is needed that can reduce resource waste while producing low-temperature water. Utility Model Content

[0004] In response to the above problems, the utility model provides a vacuum low-temperature water preparation system to solve the problem that when the existing technology uses the flash evaporation method to produce low-temperature water, the flash steam cannot be effectively utilized, while diluting the alkali solution consumes a large amount of resources, resulting in a large waste of resources.

[0005] To achieve the above-mentioned object, the utility model provides a vacuum low-temperature water preparation system, comprising a flash kettle, an alkali absorption tower and a water cooling unit, wherein the flash kettle is connected to a water inlet pipe and a low-temperature water collecting pipe, the flash kettle is connected to the alkali absorption tower, the alkali absorption tower is respectively connected to a concentrated alkali solution input pipe and a diluted alkali solution output pipe, the top of the alkali absorption tower is connected to the water cooling unit, the water cooling unit is connected to a water ring vacuum pump, and the water ring vacuum pump is connected to a non-condensable gas discharge pipe;

[0006] An alkali liquid circulation pipe is provided between the bottom and top ends of the alkali absorption tower, an alkali liquid circulation pump and a heat exchanger are provided on the alkali liquid circulation pipe, the heat exchanger is connected to a cooling water input pipe and a cooling water output pipe, the concentrated alkali liquid input pipe is connected to the alkali liquid circulation pipe, the dilute alkali liquid output pipe is connected to the bottom of the alkali absorption tower, the top end of the alkali absorption tower is connected to a non-condensable gas output pipe, and is connected to the water cooling unit through the non-condensable gas output pipe.

[0007] Furthermore, the flash kettle is provided with flash chamber 1, flash chamber 2 and flash chamber 3 which are connected in sequence, the water inlet pipe is connected to the flash chamber 1, the tops of the flash chamber 2 and the flash chamber 3 are connected to steam output pipes, and are connected to the alkali absorption tower through the steam output pipes, and the bottom of the flash chamber 3 is connected to the low-temperature water collection pipe.

[0008] Furthermore, the water cooling unit includes a steam jet pump 1, a water cooling tower 1, a steam jet pump 2, a water cooling tower 2 and a steam jet pump 3 arranged in sequence, and the two adjacent ones are connected by a pipeline, the alkali absorption tower is connected to the steam jet pump 1 through the non-condensable gas output pipe, and the steam jet pump 3 is connected to the water ring vacuum pump.

[0009] Furthermore, the steam jet pump 1, the steam jet pump 2 and the steam jet pump 3 are all connected to a high-pressure steam input pipe.

[0010] Furthermore, the water cooling tower 1 and the water cooling tower 2 are respectively connected to the cooling water input pipe and the cooling water output pipe.

[0011] Beneficial effects of the utility model:

[0012] The utility model prepares low-temperature water by flash evaporation, optimizes the process route, utilizes an alkali absorption tower and a water cooling unit to absorb flash steam, removes the heat released by condensation of flash steam and dilution of sodium hydroxide solution, and has a simple overall structure and good use effect, which can effectively realize resource utilization, energy conservation and emission reduction;

[0013] The utility model prepares low-temperature water by flash evaporating normal-temperature water, which has a simple preparation method, reduces energy consumption, and helps to achieve green and low-carbon production;

[0014] The utility model prepares low-temperature water by vacuum flash evaporation and then absorbs the flash steam with alkali solution, thereby obtaining a low-concentration sodium hydroxide solution while preparing the low-temperature water. The temperature of the prepared low-temperature water and the concentration of the sodium hydroxide can be adjusted and controlled according to actual needs and used for the production of other processes, thereby reducing carbon dioxide emissions, optimizing the existing process route, saving production costs, and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1This is the overall structure diagram of the low-temperature water preparation system;

[0017] Among them, 1-flash kettle, 110-flash chamber one, 120-flash chamber two, 130-flash chamber three, 2-alkali absorption tower, 3-water cooling unit, 310-steam jet pump one, 320-water cooling tower one, 330-steam jet pump two, 340-water cooling tower two, 350-steam jet pump three, 4-water inlet pipe, 5-low-temperature water collection pipe, 6-concentrated alkali solution inlet pipe, 7-diluted alkali solution outlet pipe, 8-water ring vacuum pump, 9-non-condensable gas discharge pipe, 10-steam outlet pipe, 11-alkali solution circulation pipe, 12-alkali solution circulation pump, 13-heat exchanger, 14-non-condensable gas output pipe, 15-high-pressure steam inlet pipe, 16-cooling water inlet pipe, 17-cooling water outlet pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In a specific embodiment of the present invention, Figure 1 As shown, a vacuum low-temperature water preparation system includes a flash kettle 1, an alkali absorption tower 2 and a water cooling unit 3. The flash kettle is connected to a water inlet pipe 4 and a low-temperature water collecting pipe 5. The flash kettle 1 is connected to the alkali absorption tower 2. The alkali absorption tower 2 is respectively connected to a concentrated alkali solution input pipe 6 and a diluted alkali solution output pipe 7. The top of the alkali absorption tower 2 is connected to the water cooling unit 3. The water cooling unit 3 is connected to a water ring vacuum pump 8. The water ring vacuum pump 8 is connected to a non-condensable gas discharge pipe 9.

[0020] An alkali liquid circulation pipe 11 is arranged between the bottom and the top of the alkali absorption tower 2, and an alkali liquid circulation pump 12 and a heat exchanger 13 are arranged on the alkali liquid circulation pipe 11. The heat exchanger 13 is connected to a cooling water input pipe 16 and a cooling water output pipe 17. The concentrated alkali liquid input pipe 6 is connected to the alkali liquid circulation pipe 11, and the dilute alkali liquid output pipe 7 is connected to the bottom of the alkali absorption tower 2. The top of the alkali absorption tower 2 is connected to a non-condensable gas output pipe 14, and is connected to the water cooling unit 3 through the non-condensable gas output pipe 14.

[0021] The flash kettle 1 is provided with a flash chamber 110, a flash chamber 2 120 and a flash chamber 3 130 which are connected in sequence. The water inlet pipe 4 is connected to the flash chamber 110. The tops of the flash chamber 2 120 and the flash chamber 3 130 are both connected to a steam output pipe 10, and are connected to the alkali absorption tower 2 through the steam output pipe 10. The bottom of the flash chamber 3 130 is connected to a low-temperature water collection pipe 5.

[0022] The water cooling unit 3 includes a steam jet pump 1 310, a water cooling tower 1 320, a steam jet pump 2 330, a water cooling tower 2 340 and a steam jet pump 3 350 arranged in sequence, and the two adjacent ones are connected by pipelines. The alkali absorption tower 2 is connected to the steam jet pump 1 310 through the non-condensable gas output pipe 14, and the steam jet pump 3 350 is connected to the water ring vacuum pump 8. The steam jet pump 1 310, the steam jet pump 2 330 and the steam jet pump 3 350 are all connected to the high-pressure steam input pipe 15, and the water cooling tower 1 320 and the water cooling tower 2 340 are respectively connected to the cooling water input pipe 16 and the cooling water output pipe 17.

[0023] The use process of this utility model:

[0024] Normal temperature water is input into flash chamber 1 110, flash chamber 2 120 and flash chamber 3 130 are evacuated, the vacuum degree of flash chamber 2 120 reaches 2kPa.A, and the vacuum degree of flash chamber 3 130 reaches 1kPa.A. Normal temperature water is naturally sucked into flash chamber 2 120 and flash chamber 3 130, and the normal temperature water is gradually cooled to 4°C and then discharged through low temperature water collecting pipe 5; a small amount of normal temperature water evaporates and enters alkali absorption tower 2 through steam output pipe 10, and concentrated sodium hydroxide solution is added from concentrated alkali solution input pipe 6. The alkali solution is injected into the alkali absorption tower 2 through the alkali solution circulation pipe 11, and absorbs steam in a spraying manner. During the condensation of the steam, the temperature of the sodium hydroxide solution rises, and the high-temperature sodium hydroxide solution exchanges heat with the cooling water through the heat exchanger 13; the non-condensable gas in the alkali absorption tower 2 is naturally sucked in by the steam jet pump 1 310, and passes through the water cooling tower 1 320 and the water cooling tower 2 340 in turn, and is cooled and absorbed by water spraying. Finally, the remaining non-condensable gas is discharged through the non-condensable gas discharge pipe 9 under the action of the water ring vacuum pump 8.

[0025] Unless otherwise specified or one preferred or optional technical means is further limited to another technical means, the preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different technical solutions. Therefore, equivalent changes made according to the claims are still within the scope covered by the present utility model.

Claims

1. A vacuum low-temperature water preparation system, characterized in that: The invention comprises a flash kettle (1), an alkali absorption tower (2) and a water cooling unit (3), wherein the flash kettle is connected to a water inlet pipe (4) and a low-temperature water collecting pipe (5), the flash kettle (1) is connected to the alkali absorption tower (2), the alkali absorption tower (2) is respectively connected to a concentrated alkali solution inlet pipe (6) and a diluted alkali solution outlet pipe (7), the top of the alkali absorption tower (2) is connected to the water cooling unit (3), the water cooling unit (3) is connected to a water ring vacuum pump (8), and the water ring vacuum pump (8) is connected to a non-condensable gas discharge pipe (9); An alkali liquid circulation pipe (11) is provided between the bottom and top ends of the alkali absorption tower (2), an alkali liquid circulation pump (12) and a heat exchanger (13) are provided on the alkali liquid circulation pipe (11), the heat exchanger (13) is connected to a cooling water input pipe (16) and a cooling water output pipe (17), the concentrated alkali liquid input pipe (6) is connected to the alkali liquid circulation pipe (11), the diluted alkali liquid output pipe (7) is connected to the bottom of the alkali absorption tower (2), the top end of the alkali absorption tower (2) is connected to a non-condensable gas output pipe (14), and is connected to the water cooling unit (3) through the non-condensable gas output pipe (14).

2. A vacuum low-temperature water preparation system according to claim 1, characterized in that: The flash kettle (1) is provided with a flash chamber 1 (110), a flash chamber 2 (120) and a flash chamber 3 (130) which are connected in sequence. The water inlet pipe (4) is connected to the flash chamber 1 (110). The tops of the flash chamber 2 (120) and the flash chamber 3 (130) are both connected to a steam output pipe (10) and are connected to the alkali absorption tower (2) through the steam output pipe (10). The bottom of the flash chamber 3 (130) is connected to the low-temperature water collecting pipe (5).

3. A vacuum low-temperature water preparation system according to claim 1, characterized in that: The water cooling unit (3) includes a steam jet pump 1 (310), a water cooling tower 1 (320), a steam jet pump 2 (330), a water cooling tower 2 (340) and a steam jet pump 3 (350) which are arranged in sequence, and the two adjacent ones are connected by pipelines. The alkali absorption tower (2) is connected to the steam jet pump 1 (310) through the non-condensable gas output pipe (14), and the steam jet pump 3 (350) is connected to the water ring vacuum pump (8).

4. A vacuum low-temperature water preparation system according to claim 3, characterized in that: The steam jet pump 1 (310), the steam jet pump 2 (330) and the steam jet pump 3 (350) are all connected to a high-pressure steam input pipe (15).

5. A vacuum low-temperature water preparation system according to claim 4, characterized in that: The water cooling tower 1 (320) and the water cooling tower 2 (340) are respectively connected to the cooling water input pipe (16) and the cooling water output pipe (17).

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