Automatic detection alarm device for preventing backflow of nitrogen pipeline of chlorination reaction kettle

Abstract

The utility model discloses an automatic detection alarm device for preventing backflow of a nitrogen pipeline of a chlorination reaction kettle, which comprises the nitrogen pipeline, a detection cavity, a path extension plate, a first one-way valve and a second one-way valve. In order to solve the technical problems that in the prior art, after a common one-way valve loses efficacy due to corrosion or jamming, corrosive and combustible gas flows back into a nitrogen pipe network and is difficult to find in time, and major potential safety and quality hazards exist, the application designs the automatic detection and alarm device for preventing backflow of the nitrogen pipeline of the chlorination reaction kettle. The detection cavity integrated with the path extension plate and the gas detection alarm unit is arranged between the first one-way valve and the second one-way valve, so that when the first one-way valve fails, the second one-way valve provides a standby barrier, and meanwhile, backflow gas is effectively retained in the detection cavity and is detected and alarmed; therefore, early warning of failure of the one-way valve is realized.

Description

Technical Field

[0001] This application relates to the field of safety equipment technology in chemical production, and in particular to an automatic detection and alarm device for preventing backflow in the nitrogen pipeline of a chlorination reactor. Background Technology

[0002] In chlorination reactions in the chemical industry, halogenated raw materials such as chlorine and volatile, flammable organic solvents such as methanol and dichloromethane are commonly used. To ensure production safety and prevent the formation of an explosive atmosphere within the reaction system, nitrogen gas is typically continuously introduced into the reactor and related pipelines for inert gas protection and purging. This nitrogen pipeline is usually equipped with a one-way valve, designed to allow nitrogen gas to flow into the production system in only one direction, preventing process gases from flowing back into the nitrogen pipeline network.

[0003] However, in the actual operation of chlorination reactions, the chlorine gas and byproduct hydrogen chloride produced during the reaction process are highly corrosive. Over time, these gases can corrode critical components of the check valve, such as the valve core and seals, leading to sealing failure. Secondly, solid impurities such as rust generated from corrosion of the pipeline's inner wall may also move with the airflow and become lodged in the check valve seat, preventing the valve from closing completely.

[0004] Once the check valve loses its check function due to corrosion or jamming, when the pressure inside the reactor exceeds the nitrogen pipeline pressure due to reaction or temperature changes, the corrosive and flammable mixed gas inside the reactor will flow back into the nitrogen pipeline through the failed check valve.

[0005] When gas backflow occurs, on the one hand, corrosive gases will contaminate the entire nitrogen supply network, causing corrosion damage to other devices and equipment using this nitrogen source; on the other hand, flammable solvent vapors will enter the nitrogen network and, after mixing with air, may form an explosive mixture, posing a serious fire and explosion risk.

[0006] More importantly, nitrogen pipelines are usually closed metal pipelines, making gas backflow extremely difficult to detect during routine inspections. It is often only traced and discovered after secondary equipment corrosion, product contamination, or even safety accidents have occurred, by which time irreparable losses have already been caused.

[0007] In other words, existing technologies have the following technical problems: ordinary nitrogen pipelines use a single one-way valve for backflow prevention, which is difficult to detect when it fails. Therefore, to address the above problems, an automatic detection and alarm device for preventing backflow in the nitrogen pipeline of a chlorination reactor is proposed. Utility Model Content

[0008] This application provides an automatic detection and alarm device for preventing backflow in nitrogen pipelines of chlorination reactors, which solves the problem that ordinary nitrogen pipelines in the prior art use a single one-way valve for backflow prevention, which is easy to fail and difficult to detect.

[0009] According to one aspect of this application, an automatic detection and alarm device for preventing backflow in the nitrogen pipeline of a chlorination reactor is provided, including the nitrogen pipeline;

[0010] It also includes a first check valve and a second check valve, which are connected in series on the nitrogen pipeline.

[0011] The detection chamber is connected to and communicates with the nitrogen pipeline, and the detection chamber is located between the first check valve and the second check valve.

[0012] The path extension plate is fixedly installed in the inner cavity of the detection chamber. The path extension plate is used to disturb and extend the flow path of the backflowing gas in the detection chamber.

[0013] The gas detection alarm unit is installed in the detection chamber.

[0014] Furthermore, the path extension plate is a baffle, and at least one baffle is provided.

[0015] Furthermore, two baffles are provided, which are fixed to the inner wall of the detection cavity at a certain angle to form a non-linear gas flow channel.

[0016] Furthermore, the baffle forms an acute angle with the normal flow direction of nitrogen.

[0017] Furthermore, the path extension plate is an L-shaped plate, and at least one L-shaped plate is provided.

[0018] Furthermore, two L-shaped plates are provided, and the two L-shaped plates are arranged in an alternating manner and fixed in the detection cavity.

[0019] Furthermore, the cross-sectional area of ​​the detection chamber is larger than that of the nitrogen pipeline.

[0020] Furthermore, the gas detection alarm unit includes a chlorine alarm and a combustible gas alarm. A first detection end is fixedly connected to the lower part of the inner wall of the detection chamber, and the first detection end is connected to the probe of the chlorine alarm.

[0021] A second detection end is fixedly connected to the upper part of the inner wall of the detection chamber, and the detector head of the combustible gas alarm is fixedly installed on the second detection end.

[0022] To address the technical problem in existing technologies where corrosive and flammable gases can easily flow back into nitrogen pipelines after ordinary check valves fail due to corrosion or jamming, posing safety and quality risks, this application presents an automatic detection and alarm device for preventing backflow in nitrogen pipelines of chlorination reactors. By installing a detection chamber integrating a path extension plate and a gas detection alarm unit between the first and second check valves, the second check valve can provide backup protection when the first check valve fails. Simultaneously, the backflowing gas is effectively trapped and detected in the detection chamber, thus achieving early warning of check valve failure and preventing the accident from escalating. This device is particularly suitable for nitrogen protection systems in chlorination reactions and other conditions involving highly corrosive or flammable media. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application;

[0025] Figure 2 This is a front view of one embodiment of the present application.

[0026] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the path extension plate in this application;

[0027] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the path extension plate in this application;

[0028] Figure 5 This is a schematic cross-sectional view of the detection cavity according to an embodiment of this application.

[0029] In the picture:

[0030] 1. Nitrogen pipeline; 101. Nitrogen inlet; 102. Nitrogen outlet;

[0031] 2. First check valve;

[0032] 3. Second check valve;

[0033] 4. Detection chamber; 401. First detection end; 402. Second detection end; 403. First clean discharge port; 404. Second clean discharge port;

[0034] 5. Path extension plate; 501. Baffle; 502. L-shaped plate;

[0035] 6. Gas detection and alarm unit; 601. Chlorine alarm; 602. Combustible gas alarm;

[0036] 7. Drainage unit; 701. First drain valve; 702. Second drain valve. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] Please see Figure 1 and Figure 2 As shown, an automatic detection and alarm device for preventing backflow in the nitrogen pipeline of a chlorination reactor includes a nitrogen pipeline 1.

[0039] It also includes a first one-way valve 2 and a second one-way valve 3, which are connected in series on the nitrogen pipeline 1, and the unidirectional conduction direction of the first one-way valve 2 and the second one-way valve 3 both point from the inlet end to the outlet end of the nitrogen pipeline 1.

[0040] The detection chamber 4 is connected to the nitrogen pipeline 1 by a flange or welding and is fluidly connected. The detection chamber 4 is located between the first check valve 2 and the second check valve 3 to form an expansion space between them that can accommodate and detect backflow gas.

[0041] The path extension plate 5 is fixedly installed in the inner cavity of the detection chamber 4. The path extension plate 5 is used to disturb and extend the flow path of the backflowing gas in the detection chamber 4.

[0042] Gas detection alarm unit 6 is installed in the detection chamber 4 to detect the gas composition at a specific location within the detection chamber 4 and to issue an alarm when the target gas exceeds the limit.

[0043] This application incorporates a detection chamber 4, integrating a path extension plate 5 and a gas detection alarm unit 6, between the first check valve 2 and the second check valve 3. This allows the second check valve 3 to provide backup protection in the event of a failure of the first check valve 2. Simultaneously, backflowing gas is effectively trapped and detected in the detection chamber 4, thus achieving early warning of check valve failure and preventing the accident from escalating. It is particularly suitable for nitrogen protection systems operating under conditions involving highly corrosive or flammable media, such as chlorination reactions.

[0044] In a preferred embodiment of this application, see [reference] Figure 1 As shown, one end of the nitrogen pipeline 1 is the nitrogen input end 101, which is used to connect to a nitrogen source or pipeline network. The other end of the nitrogen pipeline 1 is the nitrogen output end 102, which is used to connect to production systems that require protection, such as chlorination reactors. The first one-way valve 2 and the second one-way valve 3 allow nitrogen to flow normally into the system. When the system pressure is higher than the nitrogen pipeline pressure, the two valves form a barrier in sequence, which enhances the safety of the system.

[0045] Example 1 of path extension plate 5:

[0046] like Figure 3 As shown, the path extension plate 5 is a baffle 501, and at least one baffle 501 is provided.

[0047] Preferably, two baffles 501 are provided, and the two baffles 501 are fixed on the inner wall of the detection cavity 4 at a certain angle to form a non-linear gas flow channel. Through this technical solution, by physically blocking the baffles 501, when gas backflow occurs, the flow direction of the backflowing gas can be forcibly changed, so as to generate vortices and turbulence.

[0048] Furthermore, the baffle 501 forms an acute angle with the normal flow direction of nitrogen, preferably 30°, to reduce resistance during normal nitrogen transport while effectively improving the turbulence effect on reverse-flowing gas.

[0049] With this technical solution, when the gas flows in the forward direction, it can pass through smoothly. When corrosive or flammable gas leaks in the reverse direction, the gas flow path is changed multiple times and the flow rate is reduced, thereby forming a relatively stable stagnation zone near the baffle 501. This allows the leaked gas to accumulate in the area and be captured by the gas detection alarm unit 6 arranged near the stagnation zone.

[0050] Example 2 of path extension plate 5:

[0051] like Figure 4 As shown, the path extension plate 5 is an L-shaped plate 502, and at least one L-shaped plate 502 is provided.

[0052] Preferably, two L-shaped plates 502 are provided, and the two L-shaped plates 502 are arranged in an alternating manner and fixed in the detection cavity 4 to form an approximately labyrinthine gas flow channel.

[0053] With this technical solution, when gas flows through, its flow direction will be drastically changed by the vertical edge of the L-shaped plate 502, which can generate strong local turbulence and backflow zone, thereby further extending the gas passage time. When a leak occurs, the leaking gas can be trapped in the labyrinth channel for a longer period of time, and can fully contact the gas detection alarm unit 6, so that even a small leak can be detected in time and trigger an alarm.

[0054] In a preferred embodiment of this application, see [reference] Figure 1 As shown, the cross-sectional area of ​​the detection chamber 4 is larger than that of the nitrogen pipeline 1, which is used to provide a gas expansion space. Through this technical solution, since the flow area of ​​the detection chamber 4 is significantly larger than that of the nitrogen pipeline 1, the gas flow rate entering it can be reduced sharply, so that the backflowing corrosive or flammable gas can be slowed down and stay in it for a longer time, further creating conditions for reliable detection by the gas detection alarm unit 6.

[0055] Further, see Figure 1 and Figure 2 As shown, the cross-sectional shape of the detection chamber 4 is circular, which is used to withstand pressure and is easy to connect with the pipeline system.

[0056] As a preferred technical solution, please refer to Figure 5 As shown, the cross-sectional shape of the detection chamber 4 can also be rectangular, forming a box-type expansion tank, which facilitates the installation and welding of various shapes of path extension plates 5 inside, and can naturally form gas retention areas at the corners.

[0057] In a specific embodiment of this application, the detection chamber 4 and the path extension plate 5 disposed inside it together constitute a highly efficient gas retention and detection functional module. The two work together to achieve the combined functions of "expansion and deceleration" and "active turbulence and path extension", ensuring that even if the initial flow rate of the backflowing gas is very small, it can be effectively "captured" in the detection chamber 4 and stay for a sufficient period of time.

[0058] The aforementioned mechanism provides sufficient sampling conditions for the probe of the gas detection alarm unit 6, avoiding missed detections caused by gas "skimming by".

[0059] In one specific embodiment of this application, see [reference]. Figure 3As shown, the gas detection alarm unit 6 includes a chlorine alarm 601 and a combustible gas alarm 602. A first detection end 401 is fixedly connected to the lower part of the inner wall of the detection chamber 4. The first detection end 401 is connected to the probe of the chlorine alarm 601 and is used to detect and monitor the concentration of chlorine gas, which is heavier than air.

[0060] A second detection end 402 is fixedly connected to the upper part of the inner wall of the detection chamber 4. The detection head of the combustible gas alarm 602 is fixedly installed on the second detection end 402 to detect and monitor the concentration of combustible volatile solvent vapor that is lighter than or similar in density to air.

[0061] This technical solution, by setting the first detection end 401 and the second detection end 402 separately at the top and bottom, can optimize the layout according to the physical characteristics of different leaked gases, so that heavy gases are enriched at the bottom and light gases are enriched at the top. When the corresponding gas leaks, the alarm at the corresponding position can respond with the highest sensitivity, thus playing the role of accurate and rapid alarm.

[0062] Furthermore, both the chlorine alarm 601 and the combustible gas alarm 602 have on-site audible and visual alarm functions and signal transmission functions. They can issue a strong audible and visual warning at the leak site and transmit the alarm signal to the central control room so that operators can take immediate action.

[0063] In a preferred embodiment of this application, see [reference] Figure 3 As shown, in order to remove condensate that may accumulate at the bottom of the detection chamber 4 or to purge before maintenance, a draining unit 7 is also provided on the detection chamber 4. The draining unit 7 includes a first drain valve 701 and a second drain valve 702. A first drain port 403 and a second drain port 404 are fixedly provided at the bottom of the detection chamber 4.

[0064] A first drain valve 701 is fixedly installed on the first drain port 403, and a second drain valve 702 is fixedly installed on the second drain port 404.

[0065] With this technical solution, when the first one-way valve 2 needs maintenance or replacement, the first one-way valve 2 and the second one-way valve 3 can be closed, and nitrogen gas can be introduced through the first drain valve 701 and the second drain valve 702 for purging and replacement, or to drain the accumulated liquid, so that the detection chamber 4 is kept clean and dry, which plays a role in protecting the internal components, ensuring the service life of the device and the detection accuracy.

[0066] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this application does not involve any improvement to the software and methods.

[0067] 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 detection and alarm device for preventing backflow in the nitrogen pipeline of a chlorination reactor, comprising a nitrogen pipeline (1), characterized in that: It also includes a first check valve (2) and a second check valve (3), which are connected in series on the nitrogen pipeline (1); The detection chamber (4) is connected and communicates with the nitrogen pipeline (1), and the detection chamber (4) is located between the first check valve (2) and the second check valve (3). Path extension plate (5), the path extension plate (5) is fixedly installed in the inner cavity of the detection cavity (4), the path extension plate (5) is used to disturb and extend the flow path of backflow gas in the detection cavity (4); Gas detection alarm unit (6) is installed in the detection cavity (4).

2. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to claim 1, characterized in that: The cross-sectional area of ​​the detection chamber (4) is larger than that of the nitrogen pipeline (1).

3. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to any one of claims 1 or 2, characterized in that: The path extension plate (5) is a baffle (501), and at least one baffle (501) is provided.

4. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to claim 3, characterized in that: Two baffles (501) are provided, and the two baffles (501) are fixed on the inner wall of the detection cavity (4) at a certain angle to form a non-linear gas flow channel.

5. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to claim 4, characterized in that: The baffle (501) forms an acute angle with the normal flow direction of nitrogen.

6. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to any one of claims 1 or 2, characterized in that: The path extension plate (5) is an L-shaped plate (502), and at least one L-shaped plate (502) is provided.

7. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to claim 6, characterized in that: Two L-shaped plates (502) are provided, and the two L-shaped plates (502) are arranged in an alternating manner and fixed in the detection cavity (4).

8. The automatic detection and alarm device for preventing backflow in the nitrogen pipeline of the chlorination reactor according to any one of claims 1 or 2, characterized in that: The gas detection alarm unit (6) includes a chlorine alarm (601) and a combustible gas alarm (602). A first detection end (401) is fixedly connected to the lower part of the inner wall of the detection chamber (4). The first detection end (401) is connected to the probe of the chlorine alarm (601). A second detection end (402) is fixedly connected to the upper part of the inner wall of the detection cavity (4), and the probe of the combustible gas alarm (602) is fixedly installed on the second detection end (402).

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