Condenser leak detection subsystem and condenser system

Abstract

The present invention relates to the technical field of gas leak detection, and discloses a condenser leak detection subsystem and a condenser system; the condenser leak detection subsystem is connected between the gas-phase R22 outlet of the condenser body and the refrigeration system, and includes: a sampling tube, a pH on-line detection device and a sampling device. One end of the sampling tube is connected to the gas-phase R22 outlet, and the other end is connected to the sampling device. The pH on-line detection device is arranged inside the sampling device. The condenser system includes a condenser body and the above-mentioned condenser leak detection subsystem. By arranging the condenser leak detection subsystem between the condenser body and the refrigeration system, the present invention adopts the detection method of pH on-line detection, which is sensitive and reliable, has low investment cost, high automation degree, can realize on-line continuous detection, and can on-line detect whether there are strongly corrosive gases such as hydrogen fluoride and hydrogen chloride with strong acidity and alkalinity corroding the condenser body and entering the refrigeration system, avoiding the problem that the equipment of the refrigeration system is damaged and then the system stops.

Description

Technical Field

[0001] The present invention relates to the technical field of gas leak detection, and particularly to a condenser leak detection subsystem and a condenser system. Background Art

[0002] In the production process of dichlorofluoromethane (abbreviation: F22 or R22), condensers of reaction reflux towers and hydrochloric acid rectification towers are prone to corrosion and leakage due to the strong corrosiveness of process materials (such as hydrogen fluoride, hydrochloric acid, etc.), and mix with R22 and enter the refrigeration system, resulting in damage to refrigeration system equipment and then system shutdown.

[0003] Generally, the condenser body 1 in the prior art includes (as Figure 1 shown): a gas-phase material inlet 101, a liquid-phase material outlet 102, a gas-phase material outlet 103, a liquid-phase R22 inlet 104, and a gas-phase R22 outlet 105. Heat exchange is carried out between R22 and the material in the condenser body 1. The liquid-phase R22 inlet 104 and the gas-phase R22 outlet 105 are respectively connected to the refrigeration system. Generally, the material side contains strongly corrosive acidic gases such as hydrogen fluoride and hydrochloric acid. Liquid-phase R22 enters the condenser body 1 from the liquid-phase R22 inlet 104 by the refrigeration system, and the gas-phase R22 after phase change enters the refrigeration system from the gas-phase R22 outlet 105 of the condenser body 1. The strongly corrosive gas on the material side is easy to corrode the condenser body and mix with R22 on the R22 side and enter the refrigeration system. In the prior art, chromatographic analysis is generally used, and samples are taken regularly for chromatographic analysis to check whether strongly corrosive gases such as hydrogen fluoride and hydrochloric acid enter the refrigeration system. This method cannot achieve on-line continuous analysis, the analysis process has a large labor intensity, and the investment cost is high. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The purpose of the embodiments of the present invention is to provide a condenser leak detection subsystem and a condenser system to solve the technical problems of the existing chromatographic analysis method, such as inability to on-line continuously detect, high labor cost, and high investment cost.

[0006] (II) Technical Solutions

[0007] To solve the above technical problems, the embodiments of the present invention provide a condenser leak detection subsystem. The condenser leak detection subsystem is connected between the gas-phase R22 outlet of the condenser body and the refrigeration system. The condenser leak detection subsystem includes: a sampling tube, a pH on-line detection device, and a sampling device. One end of the sampling tube is connected to the gas-phase R22 outlet, and the other end is connected to the sampling device. The pH on-line detection device is arranged inside the sampling device.

[0008] Further, it also includes: a water inlet pipe, a first liquid level gauge, and a liquid level control device. The water inlet pipe is connected to the sampling device. The first liquid level gauge is arranged inside the sampling device and is connected to the liquid level control device. The liquid level control device is arranged at the water inlet pipe to control the opening and closing of the water inlet pipe.

[0009] Among them, the liquid level control device includes a first liquid level regulating valve and a first liquid level controller. The first liquid level gauge is connected to the first liquid level regulating valve through the first liquid level controller. The first liquid level regulating valve is arranged at the water inlet pipe.

[0010] Further, it also includes: a sample outlet pipe. One end of the sample outlet pipe is connected to the sampling device, and the other end is connected to the tail gas treatment system.

[0011] Further, it also includes: a sample inlet valve and a sample outlet valve. The sample inlet valve is arranged at the sample inlet pipe, and the sample outlet valve is arranged at the sample outlet pipe.

[0012] Further, it also includes: an alarm device. The alarm device is connected to the pH on-line detection device.

[0013] An embodiment of the present invention also discloses a condenser system, which includes a condenser body and a condenser leak detection subsystem as in the embodiment of the present invention.

[0014] Among them, it also includes: a temperature regulating valve, a temperature controller, and a thermometer. The thermometer is arranged at the liquid phase material outlet of the condenser body and is connected to the temperature regulating valve through the temperature controller. The temperature regulating valve is arranged between the gas phase R22 outlet and the sample inlet pipe.

[0015] Among them, it also includes: a second liquid level controller, a second liquid level regulating valve, and a second liquid level gauge. The second liquid level gauge is arranged on the R22 side. The second liquid level gauge is connected to the second liquid level regulating valve through the second liquid level controller. The second liquid level regulating valve is arranged between the liquid phase R22 inlet and the refrigeration system.

[0016] (III) Beneficial effects

[0017] A condenser leak detection subsystem and a condenser system provided by an embodiment of the present invention set a condenser leak detection subsystem between the condenser body and the refrigeration system. The pH on-line detection method is adopted to replace the chromatographic analysis method in the prior art. The detection method is sensitive and reliable, with low investment cost and high automation degree, and can realize on-line continuous detection. The condenser system including this leak detection subsystem can on-line detect whether there are strongly corrosive gases such as hydrogen fluoride and hydrogen chloride with strong acidity or alkalinity corroding the condenser body and entering the refrigeration system, avoiding the problem of equipment damage in the refrigeration system and further causing the system to stop. Description of the drawings

[0018] Figure 1 It is a schematic structural diagram of the condenser system according to an embodiment of the present invention;

[0019] Reference numerals:

[0020] 1: Condenser body; 101: Gas-phase material inlet; 102: Liquid-phase material outlet; 103: Gas-phase material outlet; 104: Liquid-phase R22 inlet; 105: Gas-phase R22 outlet; 2: Sampling tube; 3: pH on-line detector; 4: Sampler; 5: Water inlet pipe; 6: First liquid level gauge; 7: First liquid level regulating valve; 8: First liquid level controller; 9: Sampling tube; 10: Sampling valve; 11: Sampling valve; 12: Temperature regulating valve; 13: Temperature controller; 14: Thermometer; 15: Second liquid level controller; 16: Second liquid level regulating valve; 17: Second liquid level gauge. Specific embodiments

[0021] The following will further describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] As Figure 1 shown, an embodiment of the present invention discloses a condenser leak detection subsystem. The condenser leak detection subsystem is connected between the gas-phase R22 outlet 105 of the condenser body 1 and the refrigeration system. The condenser leak detection subsystem includes: a sampling tube 2, a pH on-line detection device, and a sampling device. One end of the sampling tube 2 is connected to the gas-phase R22 outlet 105, and the other end is connected to the sampling device. The pH on-line detection device is arranged inside the sampling device.

[0024] Specifically, the condenser body 1 in this embodiment includes a gas-phase material inlet 101, a liquid-phase material outlet 102, a gas-phase material outlet 103, a liquid-phase R22 inlet 104, and a gas-phase R22 outlet 105. Among them, the gas-phase material inlet 101, the liquid-phase material outlet 102, and the gas-phase material outlet 103 are connected to the material side of the condenser body, while the liquid-phase R22 inlet 104 and the gas-phase R22 outlet 105 are connected to the R22 side of the condenser body 1. The material in the material side exchanges heat with the R22 in the R22 side.

[0025] In this embodiment, the sampling device can adopt a sampler 4, and the pH on-line detection device can adopt a pH on-line detector 3. Water is introduced into the sampler 4. If gases such as hydrogen fluoride and / or hydrogen chloride are discharged through the gas-phase R22 outlet 105, they will enter the sampler 4 through the sampling tube 2. Hydrogen fluoride and hydrogen chloride dissolve in water and are both acidic, and their acid-base properties can be detected by the pH on-line detector 3. This embodiment uses the principle that the dissolution of hydrogen chloride and hydrogen fluoride in water will cause a change in the pH value of the water to determine whether there is a leak in the condenser body 1 and whether hydrogen fluoride and / or hydrogen chloride exist in the R22 side and are introduced into the refrigeration system.

[0026] A condenser leak detection subsystem provided by an embodiment of the present invention sets a condenser leak detection subsystem between the condenser body and the refrigeration system. It uses the pH on-line detection method to replace the chromatographic analysis method in the prior art. The detection method is sensitive and reliable, with low investment cost and high automation, and can achieve on-line continuous detection.

[0027] Moreover, it further includes: a water inlet pipe 5, a first liquid level gauge 6 and a liquid level control device. The water inlet pipe 5 is connected to the sampling device. The first liquid level gauge 6 is arranged in the sampling device and is connected to the liquid level control device. The liquid level control device is arranged at the water inlet pipe 5 to control the opening and closing of the water inlet pipe 5. The water inlet pipe 5 in this embodiment is used to introduce pure water into the sampler 4 so that acidic gases dissolve in water and can be detected by the pH on-line detector. The liquid level height in the sampler 4 is detected by the first liquid level gauge 6, and the opening and closing of the water inlet pipe 5 are controlled by the liquid level control device to control the input amount of pure water to control the liquid level height of the solution in the sampler 4, realizing the function of automatic liquid replenishment with high automation.

[0028] Preferably, the liquid level control device includes a first liquid level regulating valve 7 and a first liquid level controller 8. The first liquid level gauge 6 is connected to the first liquid level regulating valve 7 through the first liquid level controller 8. The first liquid level regulating valve 7 is arranged at the water inlet pipe 5. In this embodiment, the opening and closing of the first liquid level regulating valve 7 can be controlled by the first liquid level controller 8, and thus the on-off of the water inlet pipe 5 can be controlled.

[0029] Moreover, it further includes: a sampling outlet pipe 9. One end of the sampling outlet pipe 9 is connected to the sampling device, and the other end is connected to the tail gas treatment system. The sampling outlet pipe 9 is adopted in this embodiment to collect the tail gas after the reaction in the sampler 4 and introduce it into the tail gas treatment system, without tail gas emission, ensuring environmental protection and no pollution.

[0030] Moreover, it further includes: a sampling valve 10 and a sampling outlet valve 11. The sampling valve 10 is arranged at the sampling tube 2, and the sampling outlet valve 11 is arranged at the sampling outlet pipe 9. In this embodiment, the sampling valve 10 and the sampling outlet valve 11 are used to control the on-off of the sampling tube 2 and the sampling outlet pipe 9 respectively.

[0031] Further, it further includes an alarm device (not shown in the figure), and the alarm device is connected to the pH on-line detection device. In this embodiment, when the pH on-line detection device detects an acidic substance, the alarm device gives an alarm to prompt the construction personnel to timely close the condenser body 1 and the refrigeration system.

[0032] An embodiment of the present invention further discloses a condenser system, which includes a condenser body 1 and a condenser leak detection subsystem as described in the above embodiment.

[0033] The condenser system including the leak detection subsystem in the embodiment of the present invention can on-line detect whether strong corrosive gases such as hydrogen fluoride and hydrogen chloride with strong acidity and alkalinity corrode the condenser body and enter the refrigeration system, avoiding the problem of equipment damage in the refrigeration system and further causing system shutdown.

[0034] Further, it further includes a temperature regulating valve 12, a temperature controller 13 and a thermometer 14. The thermometer 14 is arranged at the liquid-phase material outlet 102 of the condenser body 1 and is connected to the temperature regulating valve 12 through the temperature controller 13. The temperature regulating valve 12 is arranged between the gas-phase R22 outlet 105 and the sampling tube 2. In this embodiment, the opening and closing of the gas-phase R22 outlet 105 are controlled by detecting the temperature at the material side outlet. If the temperature at the material side outlet is higher than the preset temperature, it means that R22 has not fully exchanged heat with the material, then the temperature regulating valve 12 is closed to enable R22 to continue to exchange heat with the material; otherwise, the temperature regulating valve 12 is opened, and R22 is introduced into the refrigeration system from the gas-phase R22 outlet 105.

[0035] Further, it further includes a second liquid level controller 15, a second liquid level regulating valve 16 and a second liquid level gauge 17. The second liquid level gauge 17 is arranged on the R22 side and is connected to the second liquid level regulating valve 16 through the second liquid level controller 15. The second liquid level regulating valve 16 is arranged between the liquid-phase R22 inlet 104 and the refrigeration system. In this embodiment, the height of the R22 liquid level on the R22 side is detected by the second liquid level gauge 17, and the opening and closing of the second liquid level regulating valve 16 are controlled by the second liquid level controller 15. If the height of the R22 liquid level on the R22 side is higher than the preset liquid level height, the second liquid level regulating valve 16 is closed, and the liquid-phase R22 is no longer introduced into the condenser body 1; otherwise, the second liquid level regulating valve 16 is opened to continuously introduce R22.

[0036] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A condenser leak detection subsystem, characterized in that: The condenser leak detection subsystem is connected between the gas phase R22 outlet of the gas phase material condenser body and the refrigeration system, the condenser leak detection subsystem includes: an inlet tube, a pH online detection device and a sampling device, one end of the inlet tube is connected to the gas phase R22 outlet, the other end is connected to the sampling device, the pH online detection device is provided inside the sampling device; Wherein, the sampling device is a sampler, and the pH online detection device is a pH online detector. Water is introduced into the sampler. If gases such as hydrogen fluoride and / or hydrogen chloride are discharged through the gas phase R22 outlet, they enter the sampler through the sampling tube. Hydrogen fluoride and hydrogen chloride are both acidic when dissolved in water, and their acidity and alkalinity can be detected by the pH online detector; The principle that the pH value of water changes when hydrogen chloride and hydrogen fluoride dissolve in water is used to determine whether there is a leak in the gas phase material condenser body and whether hydrogen fluoride and / or hydrogen chloride has entered the refrigeration system on the R22 side.

2. The condenser leak detection subsystem according to claim 1, characterized in that: Also includes: A water inlet pipe, a first liquid level gauge and a liquid level control device, wherein the water inlet pipe is connected to the sampling device, the first liquid level gauge is arranged in the sampling device and connected to the liquid level control device, and the liquid level control device is arranged at the water inlet pipe to control the opening and closing of the water inlet pipe.

3. The condenser leak detection subsystem according to claim 2, characterized in that: The liquid level control device includes a first liquid level regulating valve and a first liquid level controller. The first liquid level meter is connected to the first liquid level regulating valve through the first liquid level controller. The first liquid level regulating valve is arranged on the water inlet pipe.

4. The condenser leak detection subsystem according to claim 1, characterized in that: Also includes: A sample outlet pipe, one end of which is connected to the sampling device, and the other end of which is connected to the exhaust gas treatment system.

5. The condenser leak detection subsystem according to claim 4, characterized in that: Also includes: An injection valve and an outlet valve, wherein the injection valve is arranged at the injection tube, and the outlet valve is arranged at the outlet tube.

6. The condenser leak detection subsystem according to claim 1, characterized in that: Also includes: An alarm device is connected to the pH online detection device.

7. A condenser system, characterized in that: The invention comprises a gas phase material condenser body and a condenser leak detection subsystem as claimed in any one of claims 1 to 6.

8. The condenser system according to claim 7, characterized in that Also includes: A temperature regulating valve, a temperature controller and a thermometer, wherein the thermometer is arranged at the liquid material outlet of the gas phase material condenser body and is connected to the temperature regulating valve through the temperature controller, and the temperature regulating valve is arranged between the gas phase R22 outlet and the sampling tube.

9. The condenser system according to claim 7, characterized in that Also includes: A second liquid level controller, a second liquid level regulating valve and a second liquid level gauge, wherein the second liquid level gauge is arranged on the R22 side, the second liquid level gauge is connected to the second liquid level regulating valve through the second liquid level controller, and the second liquid level regulating valve is arranged between the liquid phase R22 inlet and the refrigeration system.

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