Automatic thermal washing device of bisphenol A crystal circulation cooler

Abstract

According to the automatic thermal washing device for the bisphenol A crystallization circulation cooler, through cooperation of switch valves and liquid level detectors on the liquid inlet pipe, the steam pipeline, the emptying pipeline and the temperature control water pipeline, scaling in the crystallization circulation cooler is automatically washed through 0.5 MPa steam, and the temperature difference of the crystallization circulation cooler is reduced; and the hot washing effect is good, the hot washing efficiency is high, and the labor intensity of workers is reduced. In addition, when a certain temperature is reached, automatic hot washing is carried out, and after hot washing is finished, temperature control water is automatically input. The device can also be suitable for other heat exchangers needing frequent hot washing.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of bisphenol A production, and relates to an automatic hot washing device for a bisphenol A crystallization circulating cooler. BACKGROUND

[0002] In the production process of bisphenol A, two parallel 37 DEG C crystallization circulating coolers are used to reduce the temperature inside the crystallizer from 65 DEG C to about 41 DEG C, so as to realize temperature reduction. During the temperature reduction of the material, bisphenol A adducts are separated from the material and adhere to the inner wall of the crystallization circulating cooler, resulting in fouling of the inner wall of the crystallization circulating cooler, continuous increase of the temperature difference of the crystallization circulating cooler, and reduction of the heat exchange effect, which finally leads to reduction of the quality and yield of bisphenol A products and failure of the system to reach the production and efficiency.

[0003] At present, for cleaning of the crystallization circulating cooler, steam is usually used for hot washing, but the workload of personnel operation is large, and therefore it is urgent to develop a new hot washing method to solve the current production difficulties. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an automatic hot washing device for a bisphenol A crystallization circulating cooler to solve the problem of large workload of the existing hot washing method.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides an automatic hot washing device for a bisphenol A crystallization circulating cooler, which comprises a liquid inlet pipe, a steam pipeline, a crystallization circulating cooler and a circulating water pump connected in sequence, wherein,

[0007] The liquid inlet pipe is connected with the steam pipeline, a vent pipeline and a temperature control water pipeline, and the temperature control water pipeline is further connected with the circulating water pump;

[0008] A water supplement adjusting valve is arranged on the temperature control water pipeline;

[0009] A first liquid level detector and a vent cut-off valve are arranged on the vent pipeline, and the vent cut-off valve is located between the first liquid level detector and the crystallization circulating cooler;

[0010] The circulating water pump and the bottom of the crystallization circulating cooler are connected with a drainage collection tank through a drainage pipeline;

[0011] A second liquid level detector and a drainage cut-off valve are arranged on the drainage pipeline in sequence, and a drain valve is further arranged in parallel at both ends of the drainage cut-off valve.

[0012] Preferably, a temperature detector is further arranged on the drainage pipeline, and the temperature detector is located between the circulating water pump and the second liquid level detector.

[0013] Preferably, 0.5 MPa steam is introduced into the steam pipeline.

[0014] Preferably, the apparatus further includes a crystallization circulation pump and a crystallizer connected together, the crystallization circulation pump being connected to the bottom of the crystallization circulation cooler.

[0015] This utility model has the following beneficial effects:

[0016] (1) Through the cooperation of various switch valves and liquid level detectors on the liquid inlet pipe, steam pipeline, venting pipeline and temperature-controlled water pipeline, the scale in the crystallization circulation cooler is automatically cleaned by 0.5MPa steam, reducing the temperature difference of the crystallization circulation cooler. The hot cleaning effect is good, the hot cleaning efficiency is high, and the labor intensity of personnel is reduced.

[0017] (2) In this device, when a certain temperature is reached, it automatically performs hot washing, and after the hot washing is completed, it automatically inputs temperature-controlled water.

[0018] (3) This device can also be applied to other heat exchangers that require frequent hot washing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the automatic hot washing device for the bisphenol A crystallization circulating cooler provided in the embodiments of this application;

[0020] Symbolic representation:

[0021] 1-Inlet pipe, 2-Crystallization circulation cooler, 3-Crystallization circulation pump, 4-Crystallizer, 5-Steam line, 6-Vent line, 7-Temperature-controlled water line, 8-Circulating water pump, 9-Water replenishment regulating valve, 10-First liquid level detector, 11-Vent shut-off valve, 12-Drainage line, 13-Drainage collection tank, 14-Second liquid level detector, 15-Drain shut-off valve, 16-Drain valve, 17-Temperature detector. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0023] This application provides an automatic hot cleaning device for a bisphenol A crystallization circulating cooler. The device includes an inlet pipe 1, a crystallization circulating cooler 2, a crystallization circulating pump 3, and a crystallizer 4, which are connected in sequence. (See attached diagram.) Figure 1 As shown.

[0024] The crystallization circulation cooler 2 is a scaling component, and its top is connected to an inlet pipe 1. The inlet pipe 1 is connected to the steam pipeline 5, the vent pipeline 6 and the temperature-controlled water pipeline 7 respectively, so that different media can be introduced into the crystallization circulation cooler 2 through different pipelines under different conditions.

[0025] Steam at 0.5 MPa is introduced into steam line 5 to clean scale buildup in the crystallization circulating cooler 2 using high-temperature steam. Vent line 6 is used to vent the temperature-controlled water supplied to the crystallization circulating cooler 2. Furthermore, to facilitate automatic control of the temperature-controlled water supply through vent line 6, a first level detector 10 and a vent shut-off valve 11 are installed on vent line 6, with the vent shut-off valve 11 located between the first level detector 10 and the crystallization circulating cooler 2. The first level detector 10 detects whether the temperature-controlled water supplied to the crystallization circulating cooler 2 has reached the predetermined level, and the vent shut-off valve 11 is used to open and close vent line 6.

[0026] Temperature-controlled water line 7 discharges temperature-controlled water into the crystallization circulating cooler 2. To facilitate control of the temperature-controlled water supply via line 7, a water replenishment regulating valve 9 is installed on line 7. Additionally, line 7 is connected to the bottom of the crystallization circulating cooler 2 via a circulating water pump 8 to facilitate the circulation of temperature-controlled water within the cooler. In this embodiment, temperature-controlled water at 45°C is introduced into the crystallization circulating cooler 2 via line 7. This temperature is close to the melting point of the material within the cooler, preventing crystallization of the tube bundles in the cooler 2 during initial water addition.

[0027] A drainage collection tank 13 is connected between the circulating water pump 8 and the bottom of the crystallization circulating cooler 2 via a drainage pipeline 12, used to discharge the scale removed during high-temperature cleaning into the drainage collection tank 13. In this embodiment, a second liquid level detector 14 and a drainage shut-off valve 15 are sequentially installed on the drainage pipeline 12, and a steam trap 16 is also connected in parallel at both ends of the drainage shut-off valve 15 to display the liquid level in the crystallization circulating cooler 2 and control drainage, thereby reducing costs. The steam trap 16 can promptly discharge the condensate from cleaning the scale, maintain the pressure inside the crystallization circulating cooler 2, increase the temperature of the crystallization circulating cooler 2, and improve the heat exchange effect.

[0028] In addition, a temperature detector 17 is installed on the drain line 12, and the temperature detector 17 is located between the circulating water pump 8 and the second liquid level detector 14. The temperature detector 17 is used to detect the temperature of the drain water at the bottom of the crystallization circulating cooler 2, and thus determine whether the hot washing has been completed.

[0029] The usage process of the automatic hot washing device for the bisphenol A crystallizer circulating cooler provided in this application embodiment is as follows:

[0030] When the crystallization circulating cooler 2 requires hot cleaning, turn off the circulating water pump 8 to stop the crystallization circulating cooler 2 from operating. Open the vent shut-off valve 11 and the drain shut-off valve 15 to drain the temperature-controlled water inside the crystallization circulating cooler 2. When the second liquid level detector 14 detects that the preset liquid level has been reached, it indicates that the temperature-controlled water inside the crystallization circulating cooler 2 has been drained. At this time, open the regulating valve and the drain valve 16 on the steam pipeline 5, close the drain shut-off valve 15, and introduce 0.5MPa steam into the crystallization circulating cooler 2. During the process of introducing steam into the crystallization circulating cooler 2, the high-temperature steam heats the tube bundle inside the crystallization circulating cooler 2 to increase the temperature and heat of the tube bundle, thereby dissolving the scale on the tube bundle and condensing it with the steam to form a condensate containing scale. The formed condensate is discharged into the drain collection tank 13 through the drain valve 16. When the temperature detector 17 detects that the temperature of the condensate at the outlet of the crystallization circulating cooler 2 reaches above 70°C, it indicates that the scale inside the crystallization circulating cooler 2 has been completely cleaned and the hot cleaning is complete.

[0031] After hot washing is completed, close the drain valve 16, open the water supply regulating valve 9 and the vent shut-off valve 11, and replenish the crystallization circulating cooler 2 with temperature-controlled water at 45°C. When the first liquid level detector 10 detects that the incoming temperature-controlled water has reached the preset liquid level in the crystallization circulating cooler 2, close the vent shut-off valve 11, turn on the circulating water pump 8, and slightly open the crystallization circulating pump 3 to allow the temperature-controlled water in the crystallization circulating cooler 2 to flow into the crystallizer 4. When the temperature difference between the inlet and outlet water of the crystallization circulating cooler 2 is detected to be less than 1°C, fully open the crystallization circulating pump 3 to cool the crystallizer 4 using the crystallization circulating cooler 2.

[0032] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An automatic hot washing device for a bisphenol A crystallization circulating cooler, characterized in that, It includes an inlet pipe (1), a crystallization circulation cooler (2), and a circulating water pump (8) connected in sequence, wherein, The liquid inlet pipe (1) is connected to the steam pipeline (5), the venting pipeline (6) and the temperature-controlled water pipeline (7) respectively, and the temperature-controlled water pipeline (7) is also connected to the circulating water pump (8). The temperature-controlled water pipeline (7) is equipped with a water supply regulating valve (9); The venting pipeline (6) is equipped with a first liquid level detector (10) and a venting shut-off valve (11), and the venting shut-off valve (11) is located between the first liquid level detector (10) and the crystallization circulation cooler (2); The circulating water pump (8) is connected to the bottom of the crystallization circulating cooler (2) via a drain pipe (12) to a drain collection tank (13). The drainage pipeline (12) is provided with a second liquid level detector (14) and a drainage shut-off valve (15) in sequence, and a drain valve (16) is also provided in parallel at both ends of the drainage shut-off valve (15).

2. The automatic hot washing device for the bisphenol A crystallization circulating cooler according to claim 1, characterized in that, A temperature detector (17) is also provided on the drainage pipeline (12), and the temperature detector (17) is located between the circulating water pump (8) and the second liquid level detector (14).

3. The automatic hot washing device for the bisphenol A crystallization circulating cooler according to claim 1, characterized in that, Steam at 0.5 MPa is introduced into the steam pipeline (5).

4. The automatic hot washing device for the bisphenol A crystallization circulating cooler according to claim 1, characterized in that, The device also includes a crystallization circulation pump (3) and a crystallizer (4) connected together, the crystallization circulation pump (3) being connected to the bottom of the crystallization circulation cooler (2).

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