Online detection device for acidic material in gas-phase refrigerant

Abstract

The utility model discloses an online detection device for an acidic material in a gas-phase refrigerant, and relates to the technical field of material detection. According to the technical scheme, the device comprises an absorption tank, acid material absorption liquid is contained in the absorption tank, the absorption tank is connected to a gas-phase refrigerant gas return pipeline through a gas inlet pipeline, and a gas inlet valve is arranged on the gas inlet pipeline; the absorption tank is provided with a pH analyzer, a water inlet pipeline and a recovery pipeline, the recovery pipeline is connected with an alkaline washing tower, the alkaline washing tower is connected with a gas compressor through a pipeline, and the gas compressor is connected with a recovery tank through a pipeline. According to the utility model, the gas-phase refrigerant after heat exchange is introduced into the absorption tank filled with the acidic material absorption liquid, and the pH value of the gas-phase refrigerant is detected by the pH analyzer to judge whether the gas-phase refrigerant carries the acidic material or not, so that whether the corrosion leakage accident occurs in the tube nest of the heat exchanger or not is judged, and a worker can take treatment measures in time, so that the working efficiency is improved. Production is practically guided, and normal production is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of material detection, in particular to an on-line detection device for acidic materials in gaseous refrigerants. Background Art

[0002] In chemical production, due to process requirements, it is necessary to provide low-temperature conditions for heat exchange. As a commonly used cold-carrying substance, the refrigerant exchanges heat with the material in the tube of the heat exchanger in the shell side of the heat exchanger. If the material in the tube of the heat exchanger is corrosive, that is, the material is an acidic material (such as hydrogen fluoride or hydrogen chloride), once it corrodes the tube, the refrigerant (such as HCFC or HFC) that becomes gaseous due to heat exchange in the shell side will be contaminated by the acidic material leaked from the tube. After the contaminated refrigerant enters the refrigeration unit, it will corrode the refrigeration unit, causing a greater impact on production. In industrial production, in view of the problem of refrigerant pollution caused by the corrosion of the tube of the heat exchanger, it is necessary to timely detect whether the gaseous refrigerant contains acidic materials to detect whether a corrosion leakage accident has occurred in the tube of the heat exchanger. However, at present, the on-line detection devices for the acidity and alkalinity of materials are mainly for the detection of liquid-phase materials, such as circulating water, brine, etc. For the detection of acidic materials in gaseous refrigerants, mainly the staff use pH test paper to detect at the exhaust port of the shell side, and this method has hysteresis in production. Therefore, there is an urgent need for a device that can on-line detect acidic materials in gaseous refrigerants to solve the above problems. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art, provide an on-line detection device for acidic materials in gaseous refrigerants, introduce the gaseous refrigerant after heat exchange into an absorption tank filled with an acidic material absorption liquid, and detect its pH value by a pH analyzer to determine whether the gaseous refrigerant carries acidic materials, so as to determine whether a corrosion leakage accident has occurred in the tube of the heat exchanger, so that the staff can take treatment measures in time, effectively guide production, and ensure the normal progress of production.

[0004] The technical solution of the utility model is as follows:

[0005] An on-line detection device for acidic materials in gaseous refrigerants, including an absorption tank, the absorption tank is filled with an acidic material absorption liquid, the absorption tank is connected to the gaseous refrigerant return pipeline through an air inlet pipeline, and an air inlet valve is arranged on the air inlet pipeline; the absorption tank is provided with a pH analyzer, a water inlet pipeline and a recovery pipeline, the recovery pipeline is connected with an alkali washing tower, the alkali washing tower is connected with a gas compressor through a pipeline, and the gas compressor is connected with a recovery tank through a pipeline.

[0006] Preferably, an electric heating wire is arranged in the absorption tank.

[0007] Preferably, the caustic scrubber is connected to a dehydrator through a pipeline, and the dehydrator is connected to a gas compressor through a pipeline.

[0008] Preferably, a liquid level sensor is provided in the absorption tank.

[0009] Preferably, a sewage pipeline is provided at the bottom of the absorption tank, and a sewage valve is provided on the sewage pipeline.

[0010] Preferably, a water inlet valve is provided on the water inlet pipeline, and a recovery valve is provided on the recovery pipeline.

[0011] Preferably, the inlet gas pipeline is connected to the gas-phase refrigerant return pipeline through a flange.

[0012] Preferably, the acidic material absorption liquid is water.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] 1. The on-line detection device for acidic materials in the gas-phase refrigerant of the present utility model judges whether the gas-phase refrigerant carries acidic materials by introducing the heat-exchanged gas-phase refrigerant into an absorption tank filled with acidic material absorption liquid and detecting its pH value by a pH analyzer, so as to judge whether the heat exchanger tubes have corroded and leaked, enabling the staff to take treatment measures in time, effectively guiding production, and ensuring the normal progress of production.

[0015] 2. The on-line detection device for acidic materials in the gas-phase refrigerant of the present utility model can realize the recycling of the gas-phase refrigerant after detection by setting a caustic scrubber, a dehydrator, a gas compressor and a recovery tank, which can not only prevent it from being directly discharged to pollute the environment, but also save materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the on-line detection device for acidic materials in the gas-phase refrigerant of the present utility model.

[0017] In the figure, 1, absorption tank; 2, inlet gas pipeline; 201, inlet gas valve; 3, gas-phase refrigerant return pipeline; 4, pH analyzer; 5, water inlet pipeline; 501, water inlet valve; 6, recovery pipeline; 601, recovery valve; 7, caustic scrubber; 8, dehydrator; 9, gas compressor; 10, recovery tank; 11, electric heating wire; 12, liquid level sensor; 13, sewage pipeline; 1301, sewage valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions of the present utility model in conjunction with the embodiments of the present utility model.

[0019] Example 1

[0020] As Figure 1 shown, this embodiment provides an on-line detection device for acidic materials in gaseous refrigerant, which includes an absorption tank 1 filled with an acidic material absorption liquid. The gaseous refrigerant is HCFC or HFC that becomes gaseous after heat exchange, the acidic material is hydrogen fluoride or hydrogen chloride, and the acidic material absorption liquid is water. The absorption tank 1 is provided with an inlet gas pipeline 2, and the inlet gas pipeline 2 is connected to the gaseous refrigerant return pipeline 3 through a flange. An inlet gas valve 201 is arranged on the inlet gas pipeline 2. The absorption tank 1 is provided with a pH analyzer 4, a water inlet pipeline 5 and a recovery pipeline 6. A sewage pipeline 13 is arranged at the bottom of the absorption tank 1. A water inlet valve 501 is arranged on the water inlet pipeline 5, a recovery valve 601 is arranged on the recovery pipeline 6, and a sewage valve 1301 is arranged on the sewage pipeline 13. The recovery pipeline 6 is connected to an alkali washing tower 7, the alkali washing tower 7 is connected to a dehydrator 8 through a pipeline, the dehydrator 8 is connected to a gas compressor 9 through a pipeline, and the gas compressor 9 is connected to a recovery tank 10 through a pipeline.

[0021] Working principle:

[0022] Hydrogen fluoride or hydrogen chloride, the acidic material to be cooled, is located in the heat exchanger tube bundle, and the refrigerant is located in the shell side. After heat exchange, the refrigerant changes from liquid phase to gas phase and is output from the heat exchanger through the gaseous refrigerant return pipeline 3. When it is necessary to detect whether the heat exchanger tube bundle is corroded by acidic materials and a leakage accident occurs, only need to open the inlet gas valve 201, and the gaseous refrigerant enters the absorption tank 1 through the inlet gas pipeline 2, and the inlet gas pipeline 2 can be inserted into the lower part of the absorption tank 1, so that the gaseous refrigerant enters the absorption tank 1 in a bubbling manner. If the heat exchanger tube bundle is corroded and acidic material leakage occurs, this part of acidic material will enter the shell side and be carried into the absorption tank 1 by the gaseous refrigerant and absorbed by water, resulting in the water becoming acidic. At this time, the pH analyzer 4 detects that the water becomes acidic and feeds back the signal to the control system, and the control system issues an alarm to remind the staff that a tube corrosion leakage accident has occurred in the heat exchanger, and notify the workshop for treatment to avoid causing large-area pollution of the refrigerant.

[0023] In addition, after the acidic material is absorbed by water, the gaseous refrigerant enters the alkali washing tower 7 through the recovery pipeline 6. After the unabsorbed acidic material is neutralized by the alkali solution, the gaseous refrigerant with moisture is dehydrated by the dehydrator 8 and then pressurized by the gas compressor 9 and enters the recovery tank 10 for recovery and temporary storage, preventing the gaseous refrigerant from polluting the environment and also avoiding material waste.

[0024] Example 2

[0025] On the basis of Example 1, as Figure 1As shown, an electric heating wire 11 is provided in the absorption tank 1. The electric heating wire 11 is energized through a control system to heat and keep warm the water in the absorption tank 1, preventing the water from freezing into ice due to too low ambient temperature and affecting the accuracy of the detection results.

[0026] Embodiment 3

[0027] On the basis of Embodiment 1, as Figure 1 shown, the absorption tank 1 is provided with a liquid level sensor 12. A lower limit value of the liquid level sensor 12 is preset in the control system. When the liquid level sensor 12 detects that the water level in the absorption tank 1 is lower than the lower limit value, the control system opens the water inlet valve 501, and replenishes water to the absorption tank 1 through the water inlet pipeline 5 to ensure the smooth progress of the detection.

Claims

1. An online detection device for acidic materials in gas phase refrigerant, characterized in that: The invention comprises an absorption tank (1), wherein the absorption tank (1) contains an acid material absorption liquid, the absorption tank (1) is connected to a gas phase refrigerant return gas pipeline (3) via an air intake pipeline (2), and an air intake valve (201) is provided on the air intake pipeline (2); the absorption tank (1) is provided with a pH analyzer (4), a water intake pipeline (5) and a recovery pipeline (6), the recovery pipeline (6) is connected to an alkali washing tower (7), the alkali washing tower (7) is connected to a gas compressor (9) via a pipeline, and the gas compressor (9) is connected to a recovery tank (10) via a pipeline.

2. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: An electric heating wire (11) is arranged in the absorption tank (1).

3. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: The alkali washing tower (7) is connected to a dehydrator (8) via a pipeline, and the dehydrator (8) is connected to a gas compressor (9) via a pipeline.

4. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: The absorption tank (1) is provided with a liquid level sensor (12).

5. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: A sewage discharge pipeline (13) is provided at the bottom of the absorption tank (1), and a sewage discharge valve (1301) is provided on the sewage discharge pipeline (13).

6. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: The water inlet pipeline (5) is provided with a water inlet valve (501), and the recovery pipeline (6) is provided with a recovery valve (601).

7. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: The air inlet pipeline (2) is connected to the gas-phase refrigerant return pipeline (3) via a flange.

8. The on-line detection device for acidic materials in gas-phase refrigerant according to claim 1, characterized in that: The acidic material absorption liquid is water.

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