Safety interlocking device for vaporization of low-temperature liquid oxygen, liquid nitrogen and liquid argon

Abstract

The utility model discloses a safety interlocking device for vaporization of low-temperature liquid oxygen, liquid nitrogen and liquid argon, and relates to the technical field of vaporization equipment. The device comprises a vaporizing tank, a DCS (Distributed Control System), a buffer pressure tank and an exhaust pipeline, wherein a material coil pipe and a steam coil pipe are arranged in the vaporizing tank; a water bath layer is arranged in the vaporizing tank; a steam inlet pipe connected with the steam coil pipe is arranged at the top of the vaporizing tank, a steam regulating valve is arranged on the steam inlet pipe, and a material inlet pipe connected with the material coil pipe is arranged at the bottom of the vaporizing tank. According to the utility model, through the design of the DCS control system, the steam regulating valve, the liquid pump, the liquid level sensor, the in-tank temperature sensor and the pipe body temperature sensor are connected with the DCS control system, when the temperature sensors detect temperature deviation, timely and safe interlocking control can be realized; safety accidents caused by pipeline leakage in the vaporization tank can be monitored, and the safety of vaporization equipment is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of vaporization equipment technology, and in particular relates to a safety interlock device for the vaporization of cryogenic liquid oxygen, liquid nitrogen and liquid argon. Background Technology

[0002] Vaporizers are mainly used to vaporize cryogenic liquids such as liquid oxygen, liquid nitrogen, and liquid argon, that is, to vaporize cryogenic liquids into room temperature gases to meet the needs of applications in fields such as steel, chemical industry, electronics, and cutting.

[0003] Currently, most industrial vaporizers use steam heating for vaporization. For example, the liquid oxygen, liquid nitrogen, and liquid argon storage systems in air separation equipment in chemical plants use water bath heat exchangers, which maintain the water temperature by introducing steam to heat the liquid oxygen, liquid nitrogen, and liquid argon and vaporize them.

[0004] The cryogenic liquid oxygen, liquid nitrogen, and liquid argon vaporization system includes a liquid storage tank, a vaporizer, and auxiliary pipelines. The liquid storage tank is used to store cryogenic liquid oxygen, liquid nitrogen, and liquid argon. The cryogenic liquid oxygen, liquid nitrogen, and liquid argon are pressurized by a liquid pump and then vaporized in the vaporizer into the corresponding oxygen, nitrogen, and argon gases. Finally, the vaporized gases are delivered to the point of use.

[0005] During the vaporization process, liquid oxygen at -182.4 degrees Celsius, liquid nitrogen at -195.4 degrees Celsius, or liquid argon at -185.3 degrees Celsius needs to be vaporized into a gas at 20-45 degrees Celsius. During vaporization, the water temperature in the vaporizer needs to be controlled at around 55 degrees Celsius. Temperatures that are too high or too low cannot guarantee the safety of the vaporization process. Otherwise, safety accidents may easily occur during this process. For example, if the supply of cryogenic liquid is too large, the ambient temperature of the vaporizer is too low, or the vaporizer malfunctions and cannot provide heat, the cryogenic liquid or gas may freeze and crack the pipes, causing a physical explosion and a safety accident. Moreover, during the vaporization process, leakage in the vaporization pipeline inside the vaporizer may cause water to be carried in the delivered gas, which may also cause safety equipment accidents.

[0006] The existing vaporizer's steam regulating valve is installed at the bottom of the vaporizer. When the liquid pump is stopped, the large temperature difference before and after the steam regulating valve causes condensation, resulting in water hammer and damage to the steam regulating valve, leading to safety and equipment accidents. Summary of the Invention

[0007] The purpose of this invention is to provide a safety interlock device for the vaporization of cryogenic liquid oxygen, liquid nitrogen, and liquid argon. Through the design of a DCS control system, and by connecting the steam regulating valve, liquid pump, liquid level sensor, tank temperature sensor, and pipe temperature sensor to the DCS control system, timely safety interlock control can be implemented when the temperature sensor detects a temperature deviation. Through the design of a dew point meter and its connection to the DCS control system, safety accidents caused by pipeline leakage inside the vaporization tank can be monitored, greatly improving the safety of the vaporization equipment.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model is a safety interlock device for the vaporization of cryogenic liquid oxygen, liquid nitrogen, and liquid argon, including a vaporization tank, a DCS control system, a buffer pressure tank, and an exhaust pipeline. The vaporization tank is equipped with a material coil and a steam coil, and a water bath layer is provided inside the vaporization tank.

[0010] The vaporization tank is provided with a steam inlet pipe at the top, which is connected to a steam coil. A steam regulating valve is provided on the steam inlet pipe. The vaporization tank is provided with a material inlet pipe at the bottom, which is connected to a material coil. A liquid pump is provided on the material inlet pipe. Both the steam regulating valve and the liquid pump are electrically connected to the DCS control system.

[0011] The vaporization tank is equipped with a liquid replenishment port and a liquid drain port at the top and bottom, respectively.

[0012] The buffer pressure tank is located outside the vaporization tank. A heat exchanger is provided at the bottom of the buffer pressure tank. The outlet end of the steam coil is connected to the heat medium inlet of the heat exchanger. The refrigerant outlet of the heat exchanger is connected to the liquid replenishment pipe through a liquid replenishment pipe.

[0013] The top of the buffer pressure tank is fixed with a disc column, and the exhaust pipe is wound around the disc column. One end of the exhaust pipe is connected to the end of the material coil of the vaporization tank. The exhaust pipe is equipped with a pipe body temperature sensor and a dew point meter at the end near the vaporization tank. Both the pipe body temperature sensor and the dew point meter are electrically connected to the DCS control system.

[0014] The other end of the exhaust pipe is equipped with an electrically controlled tee. One outlet of the electrically controlled tee is the equipment supply port, and the other outlet of the electrically controlled tee is connected to the buffer pressure tank through a branch pipe.

[0015] Furthermore, a liquid level sensor is provided on the periphery of the vaporization tank, and the liquid level sensor is electrically connected to the DCS control system.

[0016] Furthermore, an internal temperature sensor is provided on the periphery of the vaporization tank, and the internal temperature sensor is electrically connected to the DCS control system.

[0017] Furthermore, the buffer pressure tank is equipped with a pressure sensor, which is electrically connected to the DCS control system.

[0018] Furthermore, the exhaust pipe is covered with an insulation layer, and several fixing points are provided between the exhaust pipe and the disc column.

[0019] Furthermore, the buffer pressure tank is provided with a pressure relief port and an exhaust port.

[0020] This utility model has the following beneficial effects:

[0021] 1. This utility model, through the design of a DCS control system, connects the steam regulating valve, liquid pump, liquid level sensor, tank temperature sensor, and pipe temperature sensor to the DCS control system. When the temperature sensor detects a temperature deviation, it can promptly and safely interlock and control the system. Through the design of a dew point meter and its connection to the DCS control system, it can monitor safety accidents caused by pipeline leakage in the vaporization tank, greatly improving the safety of the vaporization equipment.

[0022] 2. This utility model, through the design of a buffer pressure tank, allows for the transfer of gas from the point of use to the pressure tank for buffering in the event of accidents such as insufficient temperature or water leakage in the vaporization tank via an electrically controlled three-way valve. This actively collects useless gas generated during shutdown and response processes, and also collects previously retained gas after equipment maintenance, preventing it from being delivered to subsequent gas-using equipment and causing damage or unusability. This buffering protection function improves equipment safety.

[0023] 3. This utility model improves safety by moving the regulating valve to the top to avoid water hammer caused by condensate. At the same time, the heat exchanger design can recover the heat from the steam outlet for preheating before replenishing the water bath in the vaporization tank, thus reducing energy consumption.

[0024] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural schematic diagram of a safety interlock device for the vaporization of cryogenic liquid oxygen, liquid nitrogen, and liquid argon according to this utility model.

[0027] Figure 2 This is a schematic diagram of the structure of a buffer pressure tank;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1-Vaporization tank, 2-Buffer pressure tank, 3-Exhaust pipe, 101-Steam inlet pipe, 102-Steam regulating valve, 103-Material inlet pipe, 104-Liquid pump, 105-Replenishment port, 106-Drain port, 107-Level sensor, 108-Tannel internal temperature sensor, 201-Heat exchanger, 202-Disc column, 203-Pipe body temperature sensor, 204-Dew point meter, 301-Electrically controlled tee, 302-Branch pipe. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1-2 As shown, this utility model is a safety interlock device for the vaporization of cryogenic liquid oxygen, liquid nitrogen, and liquid argon, including a vaporization tank 1, a DCS control system, a buffer pressure tank 2, and an exhaust pipe 3. The vaporization tank 1 is equipped with a material coil and a steam coil, and a water bath layer is provided inside the vaporization tank 1.

[0032] The top of the vaporization tank 1 is provided with a steam inlet pipe 101 connected to a steam coil, and a steam regulating valve 102 is provided on the steam inlet pipe 101. The bottom of the vaporization tank 1 is provided with a material inlet pipe 103 connected to a material coil, and a liquid pump 104 is provided on the material inlet pipe 103. Both the steam regulating valve 102 and the liquid pump 104 are electrically connected to the DCS control system.

[0033] The vaporization tank 1 is provided with a liquid replenishment port 105 at the top and a liquid discharge port 106 at the bottom.

[0034] The buffer pressure tank 2 is located outside the vaporization tank 1. The bottom of the buffer pressure tank 2 is equipped with a heat exchanger 201. The outlet end of the steam coil is connected to the heat medium inlet of the heat exchanger 201. The refrigerant outlet of the heat exchanger 201 is connected to the liquid replenishment port 105 through the liquid replenishment pipe.

[0035] The top of the buffer pressure tank 2 is fixed with a disc column 202, and the exhaust pipe 3 is wound around the disc column 202. One end of the exhaust pipe 3 is connected to the end of the material coil of the vaporization tank 1. The exhaust pipe 3 is equipped with a pipe body temperature sensor 203 and a dew point meter 204 near the vaporization tank 1. Both the pipe body temperature sensor 203 and the dew point meter 204 are electrically connected to the DCS control system.

[0036] The other end of the exhaust pipe 3 is equipped with an electric control tee 301. One outlet of the electric control tee 301 is the equipment supply port, and the other outlet of the electric control tee 301 is connected to the buffer pressure tank 2 through the branch pipe 302.

[0037] Among them, such as Figure 1 As shown, a liquid level sensor 107 is provided on the side of the vaporization tank, and the liquid level sensor 107 is electrically connected to the DCS control system.

[0038] Among them, such as Figure 1 As shown, a tank temperature sensor 108 is provided on the side of the vaporization tank, and the tank temperature sensor 108 is electrically connected to the DCS control system.

[0039] The buffer pressure tank 2 is equipped with a pressure sensor, which is electrically connected to the DCS control system.

[0040] Among them, the exhaust pipe 3 is covered with an insulation layer, and several fixing points are provided between the exhaust pipe 3 and the column 202.

[0041] The buffer pressure tank 2 is equipped with a pressure relief port and an exhaust port.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A safety interlocking device for low-temperature liquid oxygen, liquid nitrogen, liquid argon vaporization, comprising a vaporization tank (1), a material coil pipe and a steam coil pipe are arranged in the vaporization tank (1), a water bath layer is arranged in the vaporization tank (1), characterized in that: the water bath layer is arranged in the vaporization tank (1), and the water bath layer is arranged in the vaporization tank (1). Also including DCS control system, buffer pressure tank (2) and exhaust pipeline (3); The vaporization tank (1) is provided with a steam inlet pipe (101) connected with a steam coil at the top, the steam inlet pipe (101) is provided with a steam regulating valve (102), the vaporization tank (1) is provided with a material inlet pipe (103) connected with a material coil at the bottom, the material inlet pipe (103) is provided with a liquid pump (104), and the steam regulating valve (102) and the liquid pump (104) are electrically connected with a DCS control system. The vaporization tank (1) is provided with a liquid supplement pipe (105) and a liquid discharge pipe (106) at the top and the bottom respectively. The buffer pressure tank (2) is arranged outside the vaporization tank (1), the buffer pressure tank (2) is provided with a heat exchanger (201) at the bottom, the outlet end of the steam coil is connected with the heat medium inlet of the heat exchanger (201), and the cold medium outlet of the heat exchanger (201) is connected with the liquid supplement pipe (105) through a liquid supplement pipe. The buffer pressure tank (2) is provided with a disc column (202) at the top, the exhaust pipeline (3) is wound on the disc column (202), one end of the exhaust pipeline (3) is connected with the material coil end of the vaporization tank (1), the exhaust pipeline (3) is provided with a pipe body temperature sensor (203) and a dew point instrument (204) close to the vaporization tank (1), and the pipe body temperature sensor (203) and the dew point instrument (204) are electrically connected with the DCS control system. The other end of the exhaust pipeline (3) is provided with an electrically-controlled tee joint (301), one outlet of the electrically-controlled tee joint (301) is an equipment supply port, and the other outlet of the electrically-controlled tee joint (301) is connected with the buffer pressure tank (2) through a branch pipe (302).

2. The safety interlock device for vaporization of cryogenic liquid oxygen, liquid nitrogen, liquid argon according to claim 1, characterized in that, The vaporization tank (1) is provided with a liquid level sensor (107) on the side, and the liquid level sensor (107) is electrically connected with the DCS control system.

3. The safety interlock device for vaporization of cryogenic liquid oxygen, liquid nitrogen, liquid argon according to claim 1, characterized in that, The vaporization tank (1) is provided with a tank temperature sensor (108) on the side, and the tank temperature sensor (108) is electrically connected with the DCS control system.

4. The safety interlock device for vaporization of cryogenic liquid oxygen, liquid nitrogen, liquid argon according to claim 1, characterized in that, The buffer pressure tank (2) is provided with a pressure sensor, and the pressure sensor is electrically connected with the DCS control system.

5. The safety interlock device for vaporization of cryogenic liquid oxygen, liquid nitrogen, liquid argon according to claim 1, characterized in that, The exhaust pipeline (3) is provided with a heat preservation layer outside, and a plurality of fixing points are arranged between the exhaust pipeline (3) and the disc column (202).

6. The safety interlock device for vaporization of cryogenic liquid oxygen, liquid nitrogen, liquid argon according to claim 1, characterized in that, The buffer pressure tank (2) is provided with a pressure relief pipe and an exhaust pipe.

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