Safe liquid discharging device of gas phase instrument

Abstract

The utility model provides a safe liquid discharging device of a gas phase instrument, and relates to the technical field of petrochemical engineering. The safe drainage device comprises a water passing tank, an air inlet pipe, an exhaust pipe and a drainage pipe. Wherein the water passing tank is filled with water; the gas inlet end of the gas inlet pipe is used for being communicated with a pressure guide pipe of a gas phase instrument, and the gas outlet end of the gas inlet pipe extends below the water level in the water passing tank; the air inlet end of the exhaust pipe is communicated with the interior of the water passing tank, the air inlet end of the exhaust pipe is located above the water level in the water passing tank, and the air outlet end of the exhaust pipe extends to the outer side of the water passing tank; the air inlet end of the drainage pipe is used for being communicated with a protective gas discharge outlet, and the air outlet end of the drainage pipe is communicated with the interior of the water passing tank and located above the water level in the water passing tank. According to the safe liquid discharging device of the gas phase instrument, the risks of safety accidents such as fire disasters and poisoning caused by petrochemical gas discharged in the discharging operation process of the gas phase instrument are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a safe liquid discharge device for a gas phase instrument. Background Art

[0002] During the production process of the petrochemical industry, liquid often occurs in the pressure-intake pipes of gas-phase instruments. Liquid in the pressure-intake pipes of instruments will cause distortion of indications. Liquid in the pressure-intake pipes of key instruments such as interlocks may cause interlock shutdowns and other secondary disasters. Therefore, when liquid is found in the instruments, drainage operations must be carried out.

[0003] Currently, on-site drainage is commonly used to drain instruments. However, this method cannot achieve closed discharge and is prone to the spread of harmful substances and fire accidents caused by static electricity during the discharge of petrochemical process media, making work safety unguaranteed.

[0004] Therefore, it is necessary to design a safe liquid discharge device for a gas phase instrument to improve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a safe liquid discharge device for a gas phase instrument, so as to improve the technical problem that the liquid discharge method for the gas phase instrument in the prior art cannot ensure the safety of on-site work.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a safe liquid discharge device for a gas phase meter, which includes a water tank, an air inlet pipe, an exhaust pipe and a drainage pipe.

[0007] Among them, the water tank is filled with water; the air inlet end of the air inlet pipe is used to be connected with the pressure pipe of the gas phase instrument, and the air outlet end of the air inlet pipe extends below the water level in the water tank; the air inlet end of the exhaust pipe is connected with the water tank, the air inlet end of the exhaust pipe is located above the water level in the water tank, and the air outlet end of the exhaust pipe extends to the outside of the water tank; the air inlet end of the drainage pipe is used to be connected with the protective gas discharge port, the air outlet end of the drainage pipe is connected with the water tank, and the air outlet end of the drainage pipe is located above the water level in the water tank.

[0008] In an example of the present invention, a first valve is provided on the pressure-inducing pipe, a second valve is provided on the air intake pipe, and a third valve is provided on the drainage pipe.

[0009] In one example of the present invention, a branch pipe is connected to the main pipe of the air inlet pipe. The main pipe is used to be connected to the pressure-inducing pipe of the gas phase instrument. The branch pipe is used to be connected to the induced draft fan. A fourth valve is provided on the branch pipe.

[0010] In an example of the present invention, the length of the air intake pipe is greater than or equal to 5 meters.

[0011] In an example of the present invention, the exhaust pipe is located on the outside of the water tank and extends upward in the height direction.

[0012] In an example of the present invention, the height of the air outlet end of the exhaust pipe is higher than 2 meters.

[0013] In an example of the present invention, the height of the air inlet end of the exhaust pipe is higher than the height of the air outlet end of the drainage pipe.

[0014] In an example of the present invention, the air inlet end of the exhaust pipe is arranged on the top of the water tank.

[0015] In an example of the present invention, a flame arrester is provided on the exhaust pipe, and the flame arrester is located outside the water tank.

[0016] The safety drain device for gas-phase instruments connects the instrument's pressure-intake pipe to the inlet pipe of a water tank and continuously feeds protective gas into the water tank through the drainage pipe. While draining accumulated liquid from the instrument into the water tank, the device simultaneously absorbs toxic gases from the petrochemical gas using the water in the water tank. The continuously fed protective gas dilutes the remaining discharged petrochemical gas to a safe level, effectively reducing the risk of fires, poisoning, and other safety incidents caused by petrochemical gases discharged during the instrument's discharge process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0018] Figure 1 Shown is a structural block diagram of a safe liquid discharge device for a gas phase meter in one embodiment of the present utility model.

[0019] Component number description

[0020] 100, water tank; 200, air inlet pipe; 210, second valve; 220, branch pipe; 221, fourth valve; 300, exhaust pipe; 310, flame arrester; 400, draft pipe; 410, third valve; 500, gas phase instrument; 510, pressure pipe; 511, first valve; 600, protective gas exhaust port; 700, induced draft fan. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1 It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0023] Process media in the petrochemical industry are characterized by high temperature, high pressure, flammability, explosiveness, toxicity, and harmful substances. Hydrocracking units, in particular, involve hazardous chemicals such as hydrogen, liquefied petroleum gas (LPG), and hydrogen sulfide. Hydrogen is highly diffusible and permeable, with an explosion limit of 4% to 75% (volume ratio) and a minimum ignition energy of 0.019 mJ. Mixed with air, it can form explosive mixtures that explode upon exposure to heat or open flames. LPG primarily consists of light hydrocarbons such as propane, propylene, butane, and butene, along with small amounts of impurities such as pentane, pentene, and trace amounts of hydrogen sulfide. These light hydrocarbons have a boiling point of -12°C to 4°C, a flash point of -80°C to -60°C, a relative density (water = 1) of 0.5 to 0.6, a relative density (air = 1) of 1.5 to 2.0, and an explosion limit of 5% to 33% (volume ratio). Hydrogen can diffuse considerably farther from a relatively low level and can form explosive mixtures with air, posing a combustion and explosion hazard upon exposure to heat or open flames. In addition, hydrogen sulfide in liquefied petroleum gas is a colorless gas, easily soluble in water, with a relative density (water is 1) of 1.539g / L, a relative density (air is 1) of 1.5~2.0, a relative vapor density (air is 1) of 1.19, an explosion limit of 4.0%~46.0% (volume ratio), an auto-ignition temperature of 260°C, a minimum ignition energy of 0.077mJ, and is extremely flammable. When mixed with air, it can form an explosive mixture and can cause combustion and explosion when exposed to open flames or high heat. Hydrogen sulfide gas is highly toxic and can cause sudden death if inhaled in high concentrations. It will catch fire and backfire when exposed to fire.

[0024] In response to the safety risk issues of on-site discharge of gas phase instruments in the existing technology and based on the physical and chemical properties of the above-mentioned petrochemical gases, the inventors provide a safe liquid drain device for gas phase instruments. The safe liquid drain device connects the gas phase instrument with a water tank. In the process of discharging the liquid accumulated in the gas phase instrument, the water medium in the water tank is used to absorb toxic gases (such as hydrogen sulfide gas) in the petrochemical gas, and other discharged petrochemical gases (such as hydrogen and light hydrocarbon gases) are diluted to a safe level through the continuous input of protective gas (such as water vapor, nitrogen or argon), thereby effectively reducing the risk of safety accidents such as fire and poisoning caused by the petrochemical gases discharged during the gas phase instrument discharge operation.

[0025] See Figure 1 The utility model provides a safe liquid discharge device for a gas phase meter 500, which includes a water tank 100, an air inlet pipe 200, an exhaust pipe 300 and a drainage pipe 400.

[0026] like Figure 1 As shown, water is contained in the water tank 100. The water level (hereinafter referred to as the water level) of the water medium contained in the water tank 100 is at least higher than half the height of the water tank 100 body, so as to provide sufficient water medium to absorb the water-soluble portion of the discharged petrochemical gas, such as toxic gases represented by hydrogen sulfide. The capacity of the water tank 100 should be within an appropriate range to balance the adequacy of filtration and the ease of movement. In some embodiments, the capacity of the water tank 100 is 10L to 20L, for example, 10L, 12L, 14L, 15L, 16L, 18L, or 20L. Furthermore, it should be noted that the material of the water tank 100 is not limited and can be any conventional container material, such as steel.

[0027] like Figure 1 As shown, an air inlet pipe 200 is provided on the water tank 100. The air inlet pipe 200 is used to connect the pressure pipe 510 of the gas phase instrument 500 with the water tank 100. The air inlet end of the air inlet pipe 200 is used to connect with the pressure pipe 510 of the gas phase instrument 500, and the air outlet end of the air inlet pipe 200 extends into the water tank 100. The part of the air inlet pipe 200 located in the water tank 100 extends from the top to below the water level. For example, the air outlet end of the air inlet pipe 200 extends to the bottom of the water tank 100 in a vertical direction, and the port of the air outlet end of the air inlet pipe 200 faces the bottom wall of the water tank 100, so that the petrochemical gas input into the water tank 100 can be fully filtered through water. An exhaust pipe 300 is provided on the water tank 100. The air inlet end of the exhaust pipe 300 is connected to the inside of the water tank 100. The exhaust pipe 300 is located above the water level on the water tank 100, and the air outlet end of the exhaust pipe 300 extends to the outside of the water tank 100.

[0028] like Figure 1As shown, the water tank 100 is also provided with a drainage pipe 400. The air inlet end of the drainage pipe 400 is connected to the shielding gas discharge port 600, and the air outlet end of the drainage pipe 400 is connected to the interior of the water tank 100. The air outlet end of the drainage pipe 400 is located above the water level in the water tank 100. The drainage pipe 400 is used to guide the shielding gas discharged from the shielding gas discharge port 600 to the space above the water level in the water tank 100. The shielding gas entering the water tank 100 not only promotes the discharge of petrochemical gas, but also dilutes the discharged petrochemical gas to a safe level to avoid fire hazards caused by the discharged petrochemical gas. During the petrochemical gas discharge process, the dilution concentration of the petrochemical gas (such as hydrogen and light hydrocarbon medium gas) absorbed by the water medium can be controlled by adjusting the flow rate of the drainage pipe 400 and the air inlet pipe 200. It should be noted that the type of shielding gas outputted from the shielding gas discharge port 600 may be any inert gas, such as one or more of nitrogen, argon and water vapor.

[0029] Based on the structure of the above-mentioned safety liquid discharge device, the gas phase instrument 500 inputs petrochemical gas and condensed liquid into the water tank 100 through the air inlet pipe 200. After the petrochemical gas input into the water tank 100 through the air inlet pipe 200 is filtered by the water, the petrochemical gas that is insoluble in water enters above the water level and is then fully diluted by the protective gas introduced by the drainage pipe 400. Finally, it is safely discharged through the exhaust pipe 300 above the water level.

[0030] like Figure 1 As shown, in some embodiments, a first valve 511 is provided on the pressure-inducing pipe 510 , a second valve 210 is provided on the air inlet pipe 200 , and a third valve 410 is provided on the drainage pipe 400 . When draining the gas phase instrument 500, the first valve 511 on the pressure-inducing pipe 510 can be kept closed, and the air inlet pipe 200 can be connected to the pressure-inducing pipe 510, and the second valve 210 on the air inlet pipe 200 can be opened at the same time; then, the drainage pipe 400 can be connected to the protective discharge port, and the third valve 410 on the drainage pipe 400 can be opened to drain the protective gas into the water tank 100; when it is confirmed that gas is discharged from the exhaust pipe 300 of the water tank 100, the first valve 511 on the pressure-inducing pipe 510 can be opened to start the draining operation of the gas phase instrument 500; after the draining operation is completed, the first valve 511, the third valve 410 and the second valve 210 can be closed in sequence, and the air inlet pipe 200 can be removed from the pressure-inducing pipe 510, and the drainage pipe 400 can be removed from the protective gas discharge port 600.

[0031] like Figure 1As shown, in some embodiments, the main pipe of the air inlet pipe 200 is further connected to a branch pipe 220. The main pipe is used to communicate with the pressure-inducing pipe 510 of the gas phase instrument 500, and the branch pipe 220 is used to communicate with the induced draft fan 700. A fourth valve 221 is provided on the branch pipe 220. During the process of draining the gas phase instrument 500, the fourth valve 221 on the branch pipe 220 is closed. After the draining of the gas phase instrument 500 is completed, the fourth valve 221 on the branch pipe 220 is opened to use the induced draft fan 700 to purge the residual medium in the air inlet pipe 200.

[0032] like Figure 1 As shown, in some embodiments, the length of the air inlet pipe 200 is greater than or equal to 5 meters, so that the water tank 100 can filter and dilute the petrochemical gas discharged from the pressure pipe 510 at a position at least 5 meters away from the gas phase meter 500, thereby allowing the petrochemical gas to be guided to a safe area for discharge and ensuring the personal safety of operators at the pressure pipe 510 of the gas phase meter 500.

[0033] like Figure 1 As shown, in some embodiments, the exhaust pipe 300 is located on the outside of the water tank 100 and extends upward in the height direction. The height of the exhaust end of the exhaust pipe 300 from the ground should be higher than 2 meters, so that the gas discharged from the exhaust end of the exhaust pipe 300 is at a sufficient height from the ground, thereby protecting the safety of the operating site workers and facilities.

[0034] like Figure 1 As shown, in some embodiments, the air inlet end of the exhaust pipe 300 is higher than the air outlet end of the drainage pipe 400 on the water transfer box 100 to facilitate smooth discharge of the input gas in the water transfer box 100. For example, in one example, the air inlet end of the exhaust pipe 300 is disposed at the top of the water transfer box 100.

[0035] like Figure 1 As shown, in some embodiments, a flame arrester 310 is provided on the exhaust pipe 300 , and the flame arrester 310 is provided on the pipe body of the exhaust pipe 300 located outside the water tank 100 .

[0036] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A safe liquid discharge device for a gas phase instrument, characterized in that: include: A water tank, wherein water is contained in the water tank; An air inlet pipe, wherein the air inlet end of the air inlet pipe is connected to the pressure lead pipe of the gas phase instrument, and the air outlet end of the air inlet pipe extends below the water level in the water tank; An exhaust pipe, wherein the air inlet end of the exhaust pipe is connected to the inside of the water box, the air inlet end of the exhaust pipe is located above the water level in the water box, and the air outlet end of the exhaust pipe extends to the outside of the water box; A drainage pipe, wherein the air inlet end of the drainage pipe is connected to the protective gas exhaust port, the air outlet end of the drainage pipe is connected to the inside of the water tank, and the air outlet end of the drainage pipe is located above the water level in the water tank.

2. The safety liquid discharge device according to claim 1, characterized in that: The pressure-inducing pipe is provided with a first valve, the air inlet pipe is provided with a second valve, and the drainage pipe is provided with a third valve.

3. The safety liquid discharge device according to claim 1, characterized in that: The main pipe of the air inlet pipe is further connected with a branch pipe, the main pipe is used to be connected with the pressure-inducing pipe of the gas phase instrument, the branch pipe is used to be connected with the induced draft fan, and a fourth valve is provided on the branch pipe.

4. The safety liquid discharge device according to claim 1, characterized in that: The length of the air intake pipe is greater than or equal to 5 meters.

5. The safety liquid discharge device according to claim 1, characterized in that: The exhaust pipe is located at the outer side of the water tank and extends upward along the height direction.

6. The safety liquid discharge device according to claim 5, characterized in that: The height of the air outlet end of the exhaust pipe is higher than 2 meters.

7. The safety liquid discharge device according to claim 1, characterized in that: The height of the air inlet end of the exhaust pipe is higher than the height of the air outlet end of the drainage pipe.

8. The safety liquid discharge device according to claim 5 or 7, characterized in that: The air inlet end of the exhaust pipe is arranged on the top of the water tank.

9. The safety liquid discharge device according to claim 1, characterized in that: The exhaust pipe is provided with a flame arrester, and the flame arrester is located outside the water tank.

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