Chlorine cooling device

Abstract

The utility model belongs to the technical field of chlorine gas treatment, and provides a chlorine gas cooling device which comprises a chlorine gas inlet pipe, a chlorine gas outlet pipe, a chilled water outlet pipe, a chilled water inlet pipe, a chlorine gas lower liquid pipe and a tubular heat exchanger, the tubular heat exchanger is vertically arranged, the chlorine gas inlet pipe is communicated with an upper shell cover of a tube pass of the tubular heat exchanger, the chlorine gas outlet pipe is communicated with the side wall of a lower shell cover of the tube pass of the tubular heat exchanger, and the chlorine gas lower liquid pipe is communicated with the bottom end of the lower shell cover of the tube pass of the tubular heat exchanger; the chilled water inlet pipe is communicated with the upper part of the shell side of the tubular heat exchanger, and the chilled water outlet pipe is communicated with the lower part of the shell side of the tubular heat exchanger. According to the device, only one-stage cooling is adopted, and the contact mode of chlorine and chilled water is a down-flow cooling process, so that the purposes of saving equipment investment and reducing occupied area are achieved, and the risk that chlorine water freezes to influence system shutdown can be reduced while the chlorine cooling and water removing effect is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of chlorine treatment, and particularly relates to a chlorine cooling device. Background Technique

[0002] In the chemical production of caustic soda plants, the wet chlorine gas generated by electrolysis is washed by chlorine water and cooled by a titanium tube cooler to remove most of the moisture before it can be sent to the chlorine drying system for in-depth water treatment. After the chlorine gas is washed, the effect of water removal by titanium tube cooling directly affects the in-depth treatment efficiency and load of the downstream drying process. At the same time, the use of the titanium tube cooling device also affects the safe and stable operation of the entire caustic soda plant.

[0003] At present, there are generally two types of titanium tube cooling and water removal devices for chlorine treatment in caustic soda production plants. The first type is to use a two-stage titanium tube cooling device. The first stage uses circulating water to cool the chlorine gas countercurrently, and the second stage uses chilled water to cool the chlorine gas countercurrently. The disadvantage of this device is that the equipment investment is large and the floor area of the device is large. The second type is to only use a one-stage titanium tube cooling device and directly use chilled water to cool the chlorine gas countercurrently. However, the chilled water cannot be lower than 10°C. The chlorine gas cooling and water removal effect of this device is poor, which will increase the chlorine gas drying load and the consumption of concentrated sulfuric acid. When the chilled water temperature is lower than 9.6°C, it will cause the chlorine water to freeze and block the tube bundle or the chlorine water overflow, increasing the chlorine gas pressure fluctuation and resulting in the risk of system shutdown. Content of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a chlorine cooling device that only uses one-stage cooling, and the contact mode between the chlorine gas and the chilled water is a cocurrent cooling process. In this way, the purpose of saving equipment investment and reducing the floor area can be achieved, and at the same time, while ensuring the chlorine gas cooling and water removal effect, the risk of system shutdown caused by chlorine water freezing can be reduced.

[0005] To achieve the above object, the utility model adopts the following technical solutions: A chlorine cooling device includes a chlorine gas inlet pipe, a chlorine gas outlet pipe, a chilled water outlet pipe, a chilled water inlet pipe, a chlorine water downcomer, and a shell-and-tube heat exchanger;

[0006] The shell-and-tube heat exchanger is vertically arranged. The chlorine gas inlet pipe is communicated with the upper head of the tube side of the shell-and-tube heat exchanger. The chlorine gas outlet pipe is communicated with the side wall of the lower head of the tube side of the shell-and-tube heat exchanger. The chlorine water downcomer is communicated with the bottom end of the lower head of the tube side of the shell-and-tube heat exchanger;

[0007] The chilled water inlet pipe is communicated with the upper part of the shell side of the shell-and-tube heat exchanger. The chilled water outlet pipe is communicated with the lower part of the shell side of the shell-and-tube heat exchanger.

[0008] Preferably, the shell-and-tube heat exchanger is a titanium tube cooler.

[0009] Preferably, a temperature monitoring unit is provided on the chlorine outlet pipe, a control valve is provided on the chilled water inlet pipe, and the temperature monitoring unit is electrically connected to the control valve.

[0010] Preferably, a sight glass is provided on the chlorine liquid downcomer.

[0011] Preferably, a U-shaped water seal is provided on the chlorine liquid downcomer.

[0012] Preferably, a U-shaped elbow is provided on the chilled water outlet pipe, and the highest position of the U-shaped elbow is flush with the upper tube sheet of the shell and tube heat exchanger.

[0013] Preferably, the device further includes an exhaust pipe, and the exhaust pipe is communicated with the upper part of the shell side of the shell and tube heat exchanger.

[0014] Preferably, the device further includes a drain pipe, and the drain pipe is communicated with the lower part of the shell side of the shell and tube heat exchanger.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. A chlorine cooling device provided by the present utility model only uses primary cooling, and the contact mode between chlorine and chilled water is a countercurrent cooling process. In this way, the purpose of saving equipment investment and reducing the floor area can be achieved, and at the same time, while ensuring the chlorine cooling and water removal effect, the risk of chlorine water freezing and affecting system shutdown can be reduced. It can solve the problem that only countercurrent cooling process can be used in the prior art, and the countercurrent process can make the temperature drop of wet chlorine gas larger than that of the countercurrent process. The larger the temperature drop, the better the cooling and water removal effect.

[0017] 2. A chlorine cooling device provided by the present utility model can use chilled water below 9.6 °C. For example, using 7 °C chilled water can also ensure that the chlorine water does not freeze and block the heat exchanger, effectively solving the problem in the prior art that only chilled water with a temperature above 10 °C can be used to prevent the chlorine water from freezing and blocking the heat exchanger, and using low-temperature chilled water can further improve the cooling and water removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic connection structure diagram of a chlorine cooling device provided by an embodiment of the present utility model.

[0019] In the drawings, the list of components represented by each reference numeral is as follows:

[0020] 1. Chlorine inlet pipe; 2. Chlorine outlet pipe; 3. Chilled water outlet pipe; 4. Chilled water inlet pipe; 5. Chlorine liquid downcomer; 6. Exhaust pipe; 7. Drain pipe; 8. Shell and tube heat exchanger. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further elaborates on the present utility model in conjunction with specific embodiments, so that those skilled in the art can more clearly understand the present utility model.

[0022] It should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" in the terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For those of ordinary skill in the art, the specific meanings of such terms in this patent can be understood according to specific circumstances.

[0023] Embodiment 1

[0024] As Figure 1 shown, this embodiment provides a chlorine cooling device, including a chlorine inlet pipe 1, a chlorine outlet pipe 2, a chilled water outlet pipe 3, a chilled water inlet pipe 4, a chlorine downcomer pipe 5, and a shell-and-tube heat exchanger 8.

[0025] The material of the shell-and-tube heat exchanger 8 is titanium, that is, the shell-and-tube heat exchanger 8 is a titanium tube cooler, and the shell-and-tube heat exchanger 8 is vertically arranged.

[0026] The chlorine inlet pipe 1 is used to supply wet chlorine. The chlorine inlet pipe 1 is communicated with the upper head of the tube side of the shell-and-tube heat exchanger 8. A thermometer for detecting temperature and a pressure gauge for detecting pressure can be provided on the chlorine inlet pipe 1. The chlorine outlet pipe 2 is communicated with the side wall of the lower head of the tube side of the shell-and-tube heat exchanger 8, and the chlorine downcomer pipe 5 is communicated with the bottom end of the lower head of the tube side of the shell-and-tube heat exchanger 8.

[0027] The chilled water inlet pipe 4 is used to supply chilled water. The chilled water inlet pipe 4 is communicated with the upper part of the shell side of the shell-and-tube heat exchanger 8. The chilled water outlet pipe 3 is communicated with the lower part of the shell side of the shell-and-tube heat exchanger 8. A thermometer for detecting temperature can be provided on the chilled water outlet pipe 3.

[0028] Based on the above structure, when the device is in use, the wet chlorine at about 40°C - 45°C coming out from the top of the chlorine scrubbing tower enters the upper head of the tube side of the shell-and-tube heat exchanger 8 through the chlorine inlet pipe 1. After cooling, the chlorine is about 12°C - 15°C and enters the chlorine outlet pipe 2 from the side of the lower head of the tube side of the shell-and-tube heat exchanger 8. The chlorine water generated by cooling is taken out from the bottom of the lower head of the tube side of the shell-and-tube heat exchanger 8 and enters the chlorine downcomer pipe 5. Chilled water can use the 7°C chilled water sent by the utility engineering device, enter the upper part of the shell side of the shell-and-tube heat exchanger 8 through the chilled water inlet pipe 4, absorb the heat of the chlorine, and then flow out from the lower part of the shell side of the shell-and-tube heat exchanger 8 and enter the chilled water outlet pipe 3, thus completing the cooling of chlorine.

[0029] That is, the chlorine gas cooling device provided in this embodiment only uses primary cooling, and the contact mode between chlorine gas and chilled water is a countercurrent cooling process. This achieves the purpose of saving equipment investment and reducing the floor area, and at the same time, while ensuring the chlorine gas cooling and water removal effect, reducing the risk of chlorine water freezing affecting system shutdown. It can solve the problem in the prior art that only the countercurrent cooling process can be used, and the countercurrent process can make the temperature drop of wet chlorine gas larger than that of the countercurrent process. The greater the temperature drop, the better the cooling and water removal effect.

[0030] In this embodiment, a temperature monitoring unit is provided on the chlorine gas outlet pipe 2, a control valve is provided on the chilled water inlet pipe 4, and the temperature monitoring unit is electrically connected to the control valve.

[0031] During the production process, first, the 40°C - 45°C wet chlorine gas exchanges heat with the 7°C chilled water through the tube bundle heat exchanger. The temperature of the chlorine gas gradually decreases, and the temperature of the chilled water gradually increases; when the chlorine gas and the chilled water reach the lower position of the shell-and-tube heat exchanger 8, the temperature of the chlorine gas gradually drops to 12°C - 15°C, and the temperature of the chilled water gradually rises to 12°C - 15°C. The opening degree of the control valve on the chilled water inlet pipe 4 is automatically controlled and adjusted through the temperature monitoring unit on the chlorine gas outlet pipe 2, which can not only ensure the chlorine gas cooling and water removal effect, but also ensure that the temperatures of the chlorine gas and the chlorine water are not lower than 10°C. It effectively solves the problem in the prior art that only chilled water with a temperature above 10°C can be used to prevent chlorine water from freezing and blocking the heat exchanger, and using low-temperature chilled water can better improve the cooling and water removal effect.

[0032] In this embodiment, a sight glass is provided on the chlorine water downcomer 5, and the sight glass can observe the flow condition of the chlorine water in the chlorine water downcomer 5.

[0033] In this embodiment, a U-shaped water seal is provided on the chlorine water downcomer 5, and the U-shaped water seal can improve the airtightness of the chlorine water downcomer 5.

[0034] In this embodiment, a U-shaped elbow is provided on the chilled water outlet pipe 3, and the highest position of the U-shaped elbow is flush with the upper tube sheet of the shell-and-tube heat exchanger 8. This can ensure that the chilled water is always in a full liquid state during the production process, the heat exchange contact area with the chlorine gas reaches the maximum, and the heat exchange effect is the best.

[0035] The chlorine gas cooling device provided in this embodiment further includes an exhaust pipe 6 and a drain pipe 7.

[0036] The exhaust pipe 6 is communicated with the upper part of the shell side of the shell-and-tube heat exchanger 8. The exhaust pipe 6 can discharge the gas in the shell side of the shell-and-tube heat exchanger 8.

[0037] The drain pipe 7 is communicated with the lower part of the shell side of the shell-and-tube heat exchanger 8. The drain pipe 7 can discharge the liquid in the shell side of the shell-and-tube heat exchanger 8.

[0038] In the present utility model, the mechanisms, components, and parts for which no specific structure is described are existing structures that already exist in the prior art and can be directly purchased from the market.

[0039] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] The above is only a preferred implementation of the present utility model and is not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A chlorine gas cooling device, characterized in that: It comprises a chlorine gas inlet pipe (1), a chlorine gas outlet pipe (2), a chilled water outlet pipe (3), a chilled water inlet pipe (4), a chlorine water lower liquid pipe (5), and a shell-and-tube heat exchanger (8); The shell-and-tube heat exchanger (8) is arranged vertically, the chlorine gas inlet pipe (1) is connected to the upper end cap of the tube side of the shell-and-tube heat exchanger (8), the chlorine gas outlet pipe (2) is connected to the side wall of the lower end cap of the tube side of the shell-and-tube heat exchanger (8), and the chlorine water submerged liquid pipe (5) is connected to the bottom end of the lower end cap of the tube side of the shell-and-tube heat exchanger (8); The chilled water inlet pipe (4) is in communication with the upper shell side of the shell-and-tube heat exchanger (8), and the chilled water outlet pipe (3) is in communication with the lower shell side of the shell-and-tube heat exchanger (8); The chlorine outlet pipe (2) is provided with a temperature monitoring unit, the chilled water inlet pipe (4) is provided with a control valve, and the temperature monitoring unit is electrically connected to the control valve; The chilled water outlet pipe (3) is provided with a U-shaped bend pipe, and the highest position of the U-shaped bend pipe is flush with the upper tube plate of the shell-and-tube heat exchanger (8).

2. A chlorine gas cooling device according to claim 1, characterized in that: The shell-and-tube heat exchanger (8) is a titanium tube cooler.

3. A chlorine gas cooling device according to claim 1, characterized in that: The chlorine water underwater pipe (5) is provided with a sight glass.

4. A chlorine gas cooling device according to claim 1, characterized in that: The chlorine water underwater pipe (5) is provided with a U-shaped water seal.

5. A chlorine gas cooling device according to claim 1, characterized in that: The device further comprises an exhaust pipe (6), wherein the exhaust pipe (6) is connected to the upper part of the shell side of the shell-and-tube heat exchanger (8).

6. A chlorine gas cooling device according to claim 1, characterized in that: The device further comprises a drain pipe (7), wherein the drain pipe (7) is connected to the lower part of the shell side of the shell-and-tube heat exchanger (8).

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