Dehumidification device for process exhaust sampling pipeline

Abstract

A dehumidifying device for a process exhaust sampling pipeline comprises a frame body, an acid storage tank, a cooling-water machine and a steam-water separator. The water outlet is formed in the lower part of the acid storage tank; the water cooler is fixedly arranged on the right part of the upper layer of the frame body; the water filling opening is formed in the right part of the upper layer of the water cooler; the steam-water separator is fixedly arranged on the left part of the upper layer of the frame body; the left portion of the cooling water outlet pipe is located on the right side of the upper portion of the steam-water separator, the right portion of the cooling water outlet pipe is located in the middle of the upper portion of the water chiller, the left portion of the cooling water inlet pipe is located in the middle of the lower portion of the steam-water separator, and the right portion of the cooling water inlet pipe is located on the left side of the upper portion of the water chiller. And the water separator is connected with the acid storage tank through a connecting pipe.

Description

Technical Field

[0001] This patent relates to the technical field of effluent gas treatment equipment, and specifically to a dehumidification device for process exhaust gas sampling pipelines. Background Art

[0002] In recent years, safety accidents caused by corrosion and leakage of equipment pipelines in radiochemical enterprises have occurred from time to time. On June 18, 2022, an explosion occurred in a petrochemical company in Shanghai. A weld of the pipeline P-4507 between an ethylene oxide refining tower and a reabsorption tower corroded and fractured, and a large amount of process water leaked in the pipeline, causing the solution in the tower kettle to leak out. The ethylene oxide in the refining tower fell to the bottom of the tower kettle and leaked into the atmosphere along the pipeline in large quantities, catching fire and exploding when it encountered an ignition source. The fire caused the ethylene oxide in the tower to self-decompose, causing the ethylene oxide refining tower to explode. This is a typical case of an accident in which corrosion of a chemical pipeline caused a leak, which in turn caused serious consequences.

[0003] In the field of radiation monitoring, similarly, if monitoring, prevention and control cannot be carried out in a timely manner, there will be major hidden dangers, and even worse, it may cause serious safety accidents and property losses to the enterprise. Therefore, the anti-corrosion and anti-leakage management of equipment and pipelines must be highly valued by enterprises. Among them, acid corrosion can cause different degrees of corrosion to equipment and process pipelines, resulting in the inability of the process system to operate normally. At present, the gases in the process exhaust ducts of most radiochemical enterprises contain nitrogen oxides, such as nitrogen dioxide (NO2), nitric oxide (NO), nitrogen trioxide (N2O3), nitrogen pentoxide (N2O5), etc. Except for NO2, other nitrogen oxides are unstable and turn into NO2 or NO when exposed to light, moisture or heat, and NO turns into NO2 again. When the humidity in the pipeline is high, NO2 further reacts with water molecules to form nitric acid. Nitric acid is highly corrosive and can easily corrode process sampling pipelines and monitoring and analysis equipment. Once the monitoring equipment is corroded, on the one hand, it cannot control the process operation status well; on the other hand, the monitoring of key external emission nuclides will be out of control, which will have a great impact on environmental safety. At present, some companies usually use coupon tests or regular monitoring to calculate corrosion efficiency, so as to control the use of equipment and process pipelines. This method is effective, but adhering to the principle of economic cost, it is obviously a better choice to treat the water vapor in the equipment and process pipelines.

[0004] At present, the treatment methods adopted for water vapor in process pipelines generally include baffle-type steam-water separators, adsorption-type steam-water separators, gravity-type steam-water separators, etc. Among them, the separation efficiency of the baffle-type steam-water separator is higher than that of gravity sedimentation, and it can be used in high-pressure vessels and works stably. However, its separation load range is narrow, and the separation efficiency drops sharply after exceeding the specified flow rate of the gas-liquid mixture. The adsorption-type steam-water separator has high separation efficiency and simple structure, but like the baffle-type steam-water separator, it has a narrow separation load range, large resistance, extremely unstable operation, and is very easy to carry liquid and block. Although the gravity-type steam-water separator is simple in design and has low resistance, its separation efficiency is extremely low and the equipment is large in size and occupies a large space. The condensation-type steam-water separator uses condensation to condense steam and water into water droplets, thereby achieving the separation effect of steam and water. Then gravity sedimentation is used to separate the water droplets from the gas, thereby achieving the purpose of efficient separation. However, it needs to operate at a lower temperature, and there may be problems with incomplete condensation. This device adopts the method of cooling water circulation cooling to perfectly solve this problem.

[0005] Aerosol refers to a gaseous dispersion system composed of solid or liquid particles suspended in a gas medium. In radioactive plants, radioactive substances usually exist in the air in the form of aerosols, which are radioactive aerosols. The separation and removal technology of radioactive aerosols is often based on the principles of filtration, gravity and centrifugal sedimentation, inertial collision, diffusion, interception, and electrostatic or thermal precipitation. The condensation method used in this device only targets the water vapor in the pipeline and converts it from gas to liquid, which will not affect the radioactive aerosols. In addition, the adsorption of radioactive aerosols during the change of the physical state of water vapor can be ignored. Therefore, this device will not affect the data accuracy of subsequent monitoring equipment during the dehumidification process.

[0006] In summary, it is necessary to develop a condensation dehumidification device to condense the nitrogen oxide gas in the equipment and process pipelines into the acid storage tank, reduce the amount of acid generated in the process pipelines, thereby avoiding the corrosion of the process pipelines and monitoring equipment by the acid, extending the service life of the process pipelines and monitoring equipment, and ensuring the accuracy of the monitoring data and the controllability of key efflux nuclides. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and develop a gas-liquid separation condensation dehumidification device to condense the nitrogen oxide gas generated in the process pipeline into an acid storage tank, so that the medium in the pipeline of the on-site equipment for monitoring the process exhaust can always exist and circulate in a gaseous form, thereby effectively avoiding corrosion of the process exhaust sampling pipeline and equipment, extending the service life of the process exhaust sampling pipeline and the radiation monitoring equipment; at the same time, ensuring the normal operation of the radiation monitoring equipment and the accuracy of the monitoring data.

[0008] The technical scheme of the present invention is as follows: a dehumidification device for process exhaust gas sampling pipeline, comprising a frame, an acid storage tank, a chiller, and a steam-water separator; the acid storage tank is fixedly placed in the middle of the lower layer of the frame, the drain port is located at the lower part of the acid storage tank, the chiller is fixedly placed on the right part of the upper layer of the frame, the water injection port is located at the right part of the upper layer of the chiller, the steam-water separator is fixedly placed on the left part of the upper layer of the frame, the air inlet pipe is located at the upper part of the steam-water separator, the air outlet pipe is located at the left side of the lower part of the steam-water separator, the left part of the cooling water outlet pipe is located at the right side of the upper part of the steam-water separator, and the right part is located in the middle of the upper part of the chiller, the left part of the cooling water inlet pipe is located in the middle of the lower part of the steam-water separator, and the right part is located at the left side of the upper part of the chiller, the steam-water separator and the chiller are connected by a cooling water outlet pipe and a cooling water inlet pipe, and the water separator and the acid storage tank are connected by a connecting pipe.

[0009] The gas-water separator includes a gas cooling chamber, a cooling water circulation chamber, and an insulation layer, wherein the gas cooling chamber is located inside the cooling water circulation chamber, and the outer walls of the gas cooling chamber and the cooling water circulation chamber are both stainless steel layers, the outside of the cooling water circulation chamber is an insulation layer, and the outer wall of the insulation layer is a stainless steel layer; the air inlet pipe 9 and the air outlet pipe both extend into the gas cooling chamber.

[0010] An outlet bell mouth is installed on the outlet pipe.

[0011] Self-locking casters are installed under the frame.

[0012] It also includes a display screen, which is located in the middle of the chiller.

[0013] The cooling water is delivered to the chiller through the water injection port.

[0014] The insulation layer material is thermal insulation cotton.

[0015] The steam-water separator and acid storage tank are made of 304 stainless steel.

[0016] The drain outlet of the acid storage tank is equipped with an acid-resistant valve.

[0017] The steam-water separator has a diameter of 360mm and a height of 850mm; the gas cooling chamber has a diameter of 204mm and a height of 800mm; the cooling water circulation chamber has a diameter of 252mm and a thermal insulation layer thickness of 50mm.

[0018] The remarkable effects of the present invention are: low comprehensive cost, flexible movement and good condensation effect, modular design provides convenience for subsequent maintenance, and can realize an integrated and movable processing unit dehumidification device. The temperature control operation is simple and easy to understand, the microcomputer intelligent temperature control, and the temperature can be displayed in real time on the screen. And the device is noiseless during operation, which greatly reduces the subsequent maintenance costs. It can effectively prevent the process exhaust sampling pipeline and equipment from being corroded, and has a significant dehumidification effect. After dehumidification, the humidity of the process pipeline can be reduced from 45-55% to about 10-15%. This ensures the normal operation of downstream monitoring equipment, guarantees the accuracy of monitoring data and that the exhaust gas meets the requirements of emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a dehumidification device for process exhaust gas sampling pipeline;

[0020] Figure 2 The schematic diagram of the chiller is shown in FIG.

[0021] Figure 3 This is a schematic diagram of the condensation tank;

[0022] In the figure: 1 frame; 2 self-locking casters; 3 acid storage tank; 4 drain outlet; 5 chiller; 6 display screen; 7 water inlet; 8 gas-water separator; 9 air inlet pipe; 10 air outlet pipe; 11 cooling water outlet pipe; 12 cooling water inlet pipe; 13 stainless steel layer; 14 air outlet bell mouth; 15 gas cooling chamber; 16 cooling water circulation chamber; 17 insulation layer; connecting pipe 18. DETAILED DESCRIPTION

[0023] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0024] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.

[0025] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0026] A dehumidification device for process exhaust sampling pipeline, comprising a frame 1, self-locking casters 2, an acid storage tank 3, a drain outlet 4, a chiller 5, a display screen 6, a water injection port 7, a gas-water separator 8, an air inlet pipe 9, an air outlet pipe 10, a cooling water outlet pipe 11, a cooling water inlet pipe 12, a stainless steel layer 13, an air outlet bell mouth 14, a gas cooling chamber 15, a cooling water circulation chamber 16, and a thermal insulation layer 17;

[0027] The self-locking caster 2 is installed below the frame 1, the acid storage tank 3 is fixedly placed in the middle of the lower layer of the frame 1, the drain outlet 4 is located at the lower part of the acid storage tank 3, the chiller 5 is fixedly placed on the right part of the upper layer of the frame 1, the display screen 6 is located in the middle of the chiller 5, the water injection port 7 is located at the right part of the upper layer of the chiller 5, the steam-water separator 8 is fixedly placed on the left part of the upper layer of the frame 1, the air inlet pipe 9 is located at the upper part of the steam-water separator 8, the air outlet pipe 10 is located at the left part of the lower part of the steam-water separator 8, the cooling water outlet pipe 11 is located at the right part of the upper part of the steam-water separator 8, and the right part is located in the middle of the upper part of the chiller 5, and the cooling water inlet pipe 12 is located at the middle of the lower part of the steam-water separator 8, and the right part is located at the left part of the upper part of the chiller 5.

[0028] The steam-water separator 8 includes an air inlet pipe 9, an air outlet pipe 10, a stainless steel layer 13, an air outlet bell mouth 14, a gas cooling chamber 15, a cooling water circulation chamber 16, and a thermal insulation layer 17. The steam-water separator 8 is connected to the chiller 5 through a cooling water outlet pipe 11 and a cooling water inlet pipe 12, and the steam-water separator 8 is connected to the acid storage tank 3 through a connecting pipe 18.

[0029] The acid storage tank 3 is placed in the middle of the frame 1, and cooling water can be transported to the chiller 5 through the water injection port.

[0030] The process mainly connects the air inlet pipe 9 of the dehumidifier to the main process exhaust sampling pipeline through a three-way valve. The gas in the process exhaust sampling pipeline enters the gas cooling chamber 15 from the air inlet pipe 9, and the cooling water circulation chamber 16 outside the gas cooling chamber 15 condenses the acidic gas-liquid mixture mixed in the gas into 3 through the steam-water separator 8. Among them, the cooling water is provided by the chiller 5, and the gas is condensed through the steam-water separator 8 in a bottom-in and top-out manner. After the water tank is filled to about 1L through the water injection port 7, the chiller 5 is turned on. After the water starts to circulate, continue to add about 10L of water until the water level stops dropping. Adjust the shutdown temperature to 5°C. After setting, the system will automatically save and exit and return to the current temperature. Adjust the startup temperature to 7°C. After the setting is completed, the dehumidifier starts to run. The acid can be discharged through 4. In addition, the lower end of the dehumidifier is also provided with a self-locking caster 2, which is easy to move and assemble, and the installation time is short, and the practical application is strong.

[0031] Compared with the prior art, the utility model discloses a process exhaust gas sampling pipeline dehumidification device, which is designed with two chambers, namely gas cooling and cooling water circulation, to complete reverse heat exchange without direct contact between cooling water and sampling gas, thereby ensuring the dehumidification effect without affecting the accuracy of monitoring data; precise control of cooling water temperature is achieved through a microcomputer; and a movable integrated dehumidification device is constructed.

[0032] This dehumidification device can condense nitrogen oxide vapor into the acid storage tank, so that the medium in the process pipeline always exists and circulates in gaseous form, ensuring the normal operation of the radiation monitoring equipment. Its working principle is to use microcomputer intelligent temperature control, use ball fan to cool the water in the circulating water cooling tank, use water pump to fill the cooling water circulation chamber in the gas-liquid separator in the way of bottom in and top out, and the gas enters and exits the gas cooling chamber from top to bottom, and the gas-liquid two-phase reverse heat exchange improves the heat exchange efficiency to achieve the condensation effect.

[0033] The main body of the steam-water separator 8 is made of 304 stainless steel. The diameter of the gas cooling chamber 15 is 204mm and the height is 800mm. The diameter of the cooling water circulation chamber 16 is 252mm and the height is the same as the air cavity. The thickness of the insulation layer 17 is 50mm, and the material is thermal insulation cotton, and the outer layer is covered with 304 stainless steel. The overall dimensions of the steam-water separator 8 are 360mm in diameter and 850mm in height. The cooling water pipe interface is a 12mm diameter quick-tightening joint, and the diameter of the air pipe interface is G1 / 2. The steam-water separator 8 adopts a modular design. When repairing, only the inner wall material of the air cavity needs to be replaced, which is convenient and quick. At the same time, the gas circuit and the water circuit (condensate) are separated and do not affect each other.

[0034] The refrigeration system adopts microcomputer intelligent temperature control and is noiseless during operation.

[0035] The acid storage tank 3 is made of 304 stainless steel, with a wall thickness of 5.00mm, a volume of 30L, and an interface size of G1 / 2.

[0036] The acid storage tank 3 is used to temporarily store the acid collected by gas-liquid separation. Considering that the acid in some plants may contain a certain amount of radioactivity, a waste liquid discharge pipeline can be set as needed. The drain outlet 4 of the acid storage tank 3 is provided with an acid-resistant valve, hard seal, externally connected to a 304L stainless steel pipe, and externally connected to a DN15 stainless steel pipe (external diameter 20mm), and the pipeline can be connected to a nearby waste liquid discharge pipeline.

[0037] The device is highly integrated and has self-locking casters at the bottom, which makes it highly flexible and can be installed and used immediately.

[0038] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

[0039] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0040] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0041] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. A dehumidification device for process exhaust gas sampling pipeline, characterized in that: The invention comprises a frame (1), an acid storage tank (3), a water chiller (5), and a steam-water separator (8); the acid storage tank (3) is fixedly placed in the middle of the lower layer of the frame (1); the drain port (4) is located at the lower part of the acid storage tank (3); the water chiller (5) is fixedly placed at the right part of the upper layer of the frame (1); the water injection port (7) is located at the right part of the upper layer of the water chiller (5); the steam-water separator (8) is fixedly placed at the left part of the upper layer of the frame (1); the air inlet pipe (9) is located at the upper part of the steam-water separator (8); and the air outlet pipe (10) is located at the steam-water separator (8). The left side of the lower part of the steam-water separator (8), the left part of the cooling water outlet pipe (11) is located on the right side of the upper part of the steam-water separator (8), and the right part is located in the middle of the upper part of the chiller (5), the left part of the cooling water inlet pipe (12) is located in the middle of the lower part of the steam-water separator (8), and the right part is located on the left side of the upper part of the chiller (5), the steam-water separator (8) and the chiller (5) are connected through the cooling water outlet pipe (11) and the cooling water inlet pipe (12), and the water separator (8) and the acid storage tank (3) are connected through the connecting pipe (18).

2. A dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The steam-water separator (8) comprises a gas cooling chamber (15), a cooling water circulation chamber (16), and a thermal insulation layer (17), wherein the gas cooling chamber (15) is located inside the cooling water circulation chamber (16), and the outer walls of the gas cooling chamber (15) and the cooling water circulation chamber (16) are both stainless steel layers (13), the outside of the cooling water circulation chamber (16) is the thermal insulation layer (17), and the outer wall of the thermal insulation layer (17) is the stainless steel layer (13); the air inlet pipe (9) and the air outlet pipe (10) both extend into the gas cooling chamber (15).

3. A dehumidification device for process exhaust gas sampling pipeline according to claim 2, characterized in that: An air outlet bell mouth (14) is installed on the air outlet pipe (10).

4. A dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The self-locking casters (2) are installed below the frame (1).

5. The dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: It also includes a display screen (6), which is located in the middle of the water chiller (5).

6. A dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The cooling water is transported to the chiller (5) through the water injection port (7).

7. A dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The material of the thermal insulation layer (17) is thermal insulation cotton.

8. The dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The steam-water separator (8) and the acid storage tank (3) are made of 304 stainless steel.

9. A dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The drain outlet (4) of the acid storage tank (3) is provided with an acid-resistant valve.

10. The dehumidification device for process exhaust gas sampling pipeline according to claim 1, characterized in that: The steam-water separator (8) has a diameter of 360 mm and a height of 850 mm; the gas cooling chamber (15) has a diameter of 204 mm and a height of 800 mm; the cooling water circulation chamber (16) has a diameter of 252 mm and a thermal insulation layer (17) has a thickness of 50 mm.

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