A device for odorizing a liquefied petroleum gas filling station

Abstract

The utility model relates to liquefied petroleum gas adds the technical field of stench, especially relates to a kind of stench device for liquefied petroleum gas filling station.It includes: stench agent storage tank, stench agent storage tank inside storage has stench agent, it is provided with storage tank stench agent filling opening, storage tank pressurizing port and storage tank stench agent discharge port on it, and the storage tank pressurizing port is connected with liquefied petroleum gas unloading process gas phase pipe;Marking pipe is provided with scale on it, the lower part of the marking pipe is provided with the marking pipe stench agent inlet connected with the storage tank stench agent discharge port;Its top is provided with marking pipe pressurizing port, bottom is provided with marking pipe stench agent outlet, the marking pipe pressurizing port is connected with the liquefied petroleum gas unloading process gas phase pipe, marking pipe stench agent outlet is connected with liquefied petroleum gas unloading process liquid phase pipe, the liquefied petroleum gas unloading process liquid phase pipe is also connected with liquefied petroleum gas storage tank, its structure is simple, and does not involve electric energy, need not wiring, installation is simple, user can install by oneself, can greatly reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of odorization technology for liquefied petroleum gas, and in particular to an odorization device for liquefied petroleum gas filling stations. Background Technology

[0002] Liquefied petroleum gas (LPG) is a clean energy source widely used in industrial, residential, and automotive fuels. While colorless and odorless, its flammable and explosive properties mean that leaks can cause serious safety accidents. Currently, there are upper limits on sulfur compounds in LPG. Higher purity LPG results in lower odor detection, making leaks difficult to detect. Therefore, odorants are added to LPG.

[0003] However, existing conventional odorants are mainly plunger pump odorizers for pipeline gas. Natural gas is usually transported in a gaseous state in pipelines, while odorants (such as THT and ethanethiol) are injected in small amounts in a liquid state. Plunger pumps can stably deliver liquid odorants without being affected by vaporization. However, liquefied petroleum gas is liquid in storage tanks and filling stations, but it is very easy to vaporize when depressurized or heated, resulting in a two-phase flow of gas and liquid in the plunger pump, causing cavitation, damaging the pump body and affecting metering accuracy. Moreover, odorizers are expensive and require electricity to operate, resulting in high installation and maintenance costs, making them unsuitable for liquefied petroleum gas filling stations.

[0004] In view of the common phenomenon that liquefied petroleum gas (LPG) filling stations do not have dedicated odorization devices and the contradiction between the requirement that bottled LPG must have odor detection for leaks before leaving the factory, there is an urgent need to provide an odorization device for LPG filling stations. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an odorizing device for liquefied petroleum gas (LPG) filling stations that addresses the contradiction between the common phenomenon of LPG filling stations lacking dedicated odorizing devices and the increasing requirement for bottled LPG to have leak detection and odor identification capabilities before leaving the factory. This device also solves the comprehensive problem of the urgent need to supplement old filling stations with odorizing industrial devices and to install odorizing industrial devices at newly built filling stations.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] An odorization device for a liquefied petroleum gas filling station, comprising:

[0008] Odorant storage tank, wherein the odorant storage tank stores odorant inside, and is provided with an odorant filling port, a pressurization port and an odorant discharge port, and the pressurization port is connected to the gas phase pipe of the liquefied petroleum gas unloading process.

[0009] A calibration tube is provided with graduations. The lower part of the calibration tube is provided with a calibration tube odorant inlet connected to the odorant outlet of the storage tank. The top of the calibration tube is provided with a calibration tube pressurization port and the bottom is provided with a calibration tube odorant outlet. The calibration tube pressurization port is connected to the gas phase pipe of the liquefied petroleum gas unloading process, and the calibration tube odorant outlet is connected to the liquid phase pipe of the liquefied petroleum gas unloading process. The liquid phase pipe of the liquefied petroleum gas unloading process is also connected to the liquefied petroleum gas storage tank.

[0010] In one embodiment of this utility model, the pressurization port of the storage tank is connected to the liquefied petroleum gas unloading process gas phase pipe in sequence through the storage tank gas phase booster valve and the storage tank process gas connection pipe.

[0011] In one embodiment of this utility model, the calibration tube pressurization port is connected to the storage tank process gas connection pipe in sequence through the calibration tube gas phase control valve and the calibration tube process gas connection pipe.

[0012] As one embodiment of this utility model, it also includes a venting control valve and a pressure venting pipe;

[0013] The process gas connection pipe of the storage tank and the process gas connection pipe of the calibration pipe are both connected to the pressure venting pipe through a venting control valve, and the pressure venting pipe is connected to the atmosphere.

[0014] In one embodiment of this utility model, the odorant discharge outlet of the storage tank is connected to the odorant inlet of the calibration pipe through a calibration pipe inlet control valve and a check valve.

[0015] In one embodiment of this utility model, the odorant outlet of the calibration tube is connected to the liquefied petroleum gas unloading process liquid phase pipe via the calibration tube filling control valve and the process liquid connection pipe in sequence.

[0016] As one embodiment of this utility model, the odorant storage tank is equipped with a tank level gauge for displaying the odorant water level in the odorant storage tank.

[0017] As one embodiment of this utility model, the odorant storage tank is also provided with a storage tank safety accessory reserved port for installing safety accessories.

[0018] In one embodiment of this utility model, the safety accessory is a pressure gauge or a safety valve.

[0019] The beneficial effects of adopting the above technical solution are as follows:

[0020] The odorization device for liquefied petroleum gas filling stations provided in this embodiment of the invention has a simple structure, can be installed by the user, and can greatly reduce costs. In addition, the driving force of the entire device comes from the gas pressure in the gas phase pipe of the liquefied petroleum gas unloading process. This pressure can be the gas phase liquefied petroleum gas pressure provided by the unloading process compressor of the filling station, or the gas pressure provided by inert gas cylinders such as nitrogen. It does not involve electricity, requires no wiring, and is easy to install.

[0021] The odorization device provided by this utility model is a differential pressure quantitative one-time odorization device. It makes full use of the unloading process of liquefied petroleum gas stations, treating the storage tank as a natural "reactor" to ensure uniform odorization. It directly utilizes the gas phase pressure provided by the compressor of the unloading process of liquefied petroleum gas filling station or the backup inert gas cylinder to provide the system driving force, replacing the investment and maintenance of gas station electrical explosion-proof equipment caused by electric drive, as well as various problems caused by hardened ground wiring damage.

[0022] In addition, the odorization device can be added in one go through local direct reading and simple valve opening and closing operation, which can basically achieve maintenance-free operation. Compared with the existing conventional plunger-type odorization equipment, which requires maintenance of plunger pump and control system, the odorization device provided by this utility model has low maintenance cost and is suitable for widespread promotion. Attached Figure Description

[0023] Figure 1 This is a connection diagram of an odorization device for a liquefied petroleum gas filling station provided in an embodiment of this utility model.

[0024] Among them, there is a 100 LPG unloading process vapor phase pipe, a 200 LPG unloading process liquid phase pipe, and a 300 LPG storage tank.

[0025] 0 Ozone storage tank; 1 Process gas connection pipe for storage tank; 2 Ozone filling port for storage tank; 3 Gas phase booster valve for storage tank; 4 Pressure vent pipe; 5 Venting control valve; 6 Level gauge for storage tank; 7 Inlet control valve for calibration pipe; 8 Check valve; 9 Process liquid connection pipe; 10 Calibration pipe filling control valve; 11 Calibration pipe; 12 Calibration pipe gas phase control valve; 13 Reserved port for safety accessories for storage tank; 14 Pressurization port for storage tank; 15 Ozone discharge port for storage tank; 16 Ozone inlet for calibration pipe; 17 Pressurization port for calibration pipe; 18 Ozone outlet for calibration pipe; 19 Process gas connection pipe for calibration pipe. Detailed Implementation

[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be clearly and completely described below in conjunction with specific embodiments.

[0027] This utility model embodiment provides an odorization device for liquefied petroleum gas filling stations, such as... Figure 1 As shown, it includes:

[0028] Odorant storage tank 0, which stores odorant inside, is provided with odorant filling port 2, pressurization port 14 and odorant discharge port 15. The pressurization port 14 is connected to the liquefied petroleum gas unloading process vapor phase pipe 100. The gas pressure in the liquefied petroleum gas unloading process vapor phase pipe 100 can be the vapor phase liquefied petroleum gas pressure provided by the unloading process compressor of the filling station, or the gas pressure provided by inert gas cylinders such as nitrogen. This utility model embodiment does not specifically limit this.

[0029] Of course, to facilitate staff understanding of the amount of odorant in the odorant storage tank and to improve safety performance, such as... Figure 1 As shown, the odorant storage tank 0 is equipped with a tank level gauge 6 for displaying the odorant level in the tank 0; the odorant storage tank 0 is also equipped with a tank safety accessory reserved port 13 for installing safety accessories, which can be a pressure gauge or a safety valve.

[0030] A calibration tube 11 is provided with a scale, which can identify the volume of odorant inside the calibration tube 11. The lower part of the calibration tube 11 is provided with a calibration tube odorant inlet 16 connected to the odorant outlet 15 of the storage tank. The top of the calibration tube is provided with a calibration tube pressurization port 17 and the bottom is provided with a calibration tube odorant outlet 18. The calibration tube pressurization port 17 is connected to the gas phase pipe 100 of the liquefied petroleum gas unloading process, and the calibration tube odorant outlet 18 is connected to the liquid phase pipe 200 of the liquefied petroleum gas unloading process. The liquid phase pipe 200 of the liquefied petroleum gas unloading process is also connected to the liquefied petroleum gas storage tank 300.

[0031] It should be noted that the LPG unloading process gas phase pipe 100, LPG unloading process liquid phase pipe 200, and LPG storage tank 300 in the embodiments of this utility model are all schematic diagrams of process facilities at the place of use, used to illustrate the usage method of this utility model, and are not the actual invention.

[0032] The odorization device for liquefied petroleum gas (LPG) filling stations provided in this embodiment is suitable for scenarios where odorization of LPG in storage tanks is required at LPG filling stations, employing a process of odorization before unloading. This device is installed at the unloading process end of the LPG filling station, which refers to the process pipelines, equipment, and operating procedures involved when tank trucks (transport vehicles) unload liquid within the station. Its core function is to safely and efficiently unload the liquid LPG from the tank trucks into the station's storage tanks, while simultaneously maintaining pressure stability through a gas phase balance system.

[0033] Before use, connect the gas phase pipe 100 and the liquid phase pipe 200 of the liquefied petroleum gas unloading process to the tank truck respectively, enter the unloading operation preparation procedure, and add the odorant used for odorizing liquefied petroleum gas into the odorant storage tank 0 through the odorant filling port 2 of the storage tank. When odorization is required, before the daily tank truck unloading operation at the LPG filling station, the amount of odorant to be added is calculated based on the estimated target unloading volume of LPG for that operation. Then, air is introduced into the odorant storage tank 0 through the LPG unloading process vapor phase pipe 100 to increase its internal pressure. After that, the odorant can flow from the odorant storage tank 0 to the calibration pipe 11. Once the odorant volume in the calibration pipe 11 is determined to have reached the required amount of odorant to be added, the flow of odorant into the calibration pipe 11 is stopped. Then, air is introduced into the calibration pipe 11 through the LPG unloading process vapor phase pipe 100 to increase the internal pressure. The odorant then enters the LPG storage tank 300 through the calibration pipe odorant outlet 18 and the LPG unloading process liquid phase pipe 200, thus realizing the odorant addition operation in the storage tank.

[0034] After that, the unloading process officially begins, and the normal unloading operation is completed.

[0035] The odorization device for liquefied petroleum gas filling stations provided in this embodiment of the invention has a simple structure, can be installed by the user, and can greatly reduce costs. In addition, the driving force of the entire device comes from the gas pressure in the gas phase pipe of the liquefied petroleum gas unloading process. This pressure can be the gas phase liquefied petroleum gas pressure provided by the unloading process compressor of the filling station, or the gas pressure provided by inert gas cylinders such as nitrogen. It does not involve electricity, requires no wiring, and is easy to install.

[0036] The odorization device provided by this utility model is a differential pressure quantitative one-time odorization device. It makes full use of the unloading process of liquefied petroleum gas stations, treating the storage tank as a natural "reactor" to ensure uniform odorization. It directly utilizes the gas phase pressure provided by the compressor of the unloading process of liquefied petroleum gas filling station or the backup inert gas cylinder to provide the system driving force, replacing the investment and maintenance of gas station electrical explosion-proof equipment caused by electric drive, as well as various problems caused by hardened ground wiring damage.

[0037] Furthermore, the aforementioned process can be implemented using a combination of sensors and controllers, or it can be implemented manually. In this embodiment, valves are used to implement the aforementioned gas filling and liquid draining processes, such as... Figure 1 As shown, the pressurization port 14 of the storage tank is connected to the liquefied petroleum gas unloading process gas phase pipe 100 in sequence through the storage tank gas phase booster valve 3 and the storage tank process gas connection pipe 1; the odorant discharge port 15 of the storage tank is connected to the odorant inlet 16 of the calibration pipe through the calibration pipe liquid inlet control valve 7 and the check valve 8.

[0038] The calibration tube pressurization port 17 is connected to the storage tank process gas connection pipe 1 in sequence through the calibration tube gas phase control valve 12 and the calibration tube process gas connection pipe 19; the calibration tube odorant outlet 18 is connected to the liquefied petroleum gas unloading process liquid phase pipe 200 in sequence through the calibration tube filling control valve 10 and the process liquid connection pipe 9.

[0039] Furthermore, after the odorization operation is completed, a pressure relief device can be installed to depressurize all gas lines, such as... Figure 1 As shown, it also includes a venting control valve 5 and a pressure venting pipe 4. The process gas connection pipe 1 of the storage tank and the process gas connection pipe 19 of the calibration pipe are both connected to the pressure venting pipe 4 through the venting control valve 5. The pressure venting pipe 4 is connected to the atmosphere.

[0040] The specific control process is as follows:

[0041] Based on the target unloading volume of LPG for this operation, calculate the amount of odorant to be added. Open the gas phase booster valve 3 of the storage tank to introduce a slight pressure into the odorant storage tank 0. Close the gas phase booster valve 3 and slowly open the calibration pipe inlet control valve 7 to introduce a quantitative amount of odorant into the calibration pipe 11. Close the calibration pipe inlet control valve 7 and open the calibration pipe gas phase control valve 12. Slowly open the calibration pipe filling control valve 10 and use the gas phase pressure provided by the process gas connection pipe 1 of the storage tank to press the odorant in the calibration pipe 11 into the process liquid connection pipe 9. Then, it enters the LPG storage tank 300 through the liquid phase unloading process pipeline of the LPG filling station. During the unloading process, the odorant fully mixes with the LPG in the LPG storage tank 300 to achieve the purpose of odorization. After the operation is completed, close all device valves and all external valves connected to this device, and open the venting control valve 5 to release the pre-pressure of this device through the pressure venting pipe 4.

[0042] The odorization device for liquefied petroleum gas filling stations provided in this embodiment of the invention can add odor in one go through local direct reading and simple valve opening and closing operations, and can basically achieve maintenance-free operation. Compared with the existing conventional plunger-type odorization equipment, which requires maintenance of plunger pumps and control systems, the odorization device provided by this invention has low maintenance costs.

[0043] The odorization device provided in this embodiment has been put into trial use at several liquefied petroleum gas filling stations, achieving a 100% odorization compliance rate. Furthermore, experiments were conducted on three commonly used gas odorants (ethanethiol, tetrahydrothiophene, and sulfur-free odorant), all showing good results. When tetrahydrothiophene and ethanethiol were added, samples were taken from the upper, middle, and lower liquid levels of the storage tank, and tests were performed using a portable detector; the concentration values ​​all met the preset values. The sulfur-free odorant showed a clear warning odor upon sample release.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An odorization device for liquefied petroleum gas filling stations, characterized in that, It includes: Odorant storage tank (0), the odorant storage tank (0) stores odorant inside, and is provided with odorant filling port (2), pressurization port (14) and odorant discharge port (15) on it, and the pressurization port (14) is connected to the gas phase pipe (100) of liquefied petroleum gas unloading process; A calibration tube (11) is provided with a scale. The lower part of the calibration tube (11) is provided with a calibration tube odorant inlet (16) connected to the odorant outlet (15) of the storage tank. The top of the calibration tube is provided with a calibration tube pressurization port (17) and the bottom is provided with a calibration tube odorant outlet (18). The calibration tube pressurization port (17) is connected to the gas phase pipe (100) of the liquefied petroleum gas unloading process, and the calibration tube odorant outlet (18) is connected to the liquid phase pipe (200) of the liquefied petroleum gas unloading process. The liquid phase pipe (200) of the liquefied petroleum gas unloading process is also connected to the liquefied petroleum gas storage tank (300).

2. An odorizing device for an LPG filling station according to claim 1, characterized in that, The pressurization port (14) of the storage tank is connected to the gas phase pipe (100) of the liquefied petroleum gas unloading process through the gas phase booster valve (3) of the storage tank and the process gas connection pipe (1) of the storage tank in sequence.

3. An odorizing device for an LPG filling station according to claim 2, characterized in that, The calibration tube pressurization port (17) is connected to the storage tank process gas connection pipe (1) in sequence through the calibration tube gas phase control valve (12) and the calibration tube process gas connection pipe (19).

4. An odorizing device for an LPG filling station according to claim 3, characterized in that, It also includes a venting control valve (5) and a pressure venting pipe (4); The process gas connection pipe (1) of the storage tank and the process gas connection pipe (19) of the calibration pipe are both connected to the pressure vent pipe (4) through the vent control valve (5), and the pressure vent pipe (4) is connected to the atmosphere.

5. An odorizing device for an LPG filling station according to claim 1, characterized in that, The odorant outlet (15) of the storage tank is connected to the odorant inlet (16) of the calibration tube through the calibration tube liquid inlet control valve (7) and the check valve (8).

6. An odorizing device for an LPG filling station according to claim 1, characterized in that, The odorant outlet (18) of the calibration tube is connected to the liquefied petroleum gas unloading process liquid phase pipe (200) in sequence through the calibration tube filling control valve (10) and the process liquid connection pipe (9).

7. An odorizing device for an LPG filling station according to claim 1, characterized in that, The odorant storage tank (0) is equipped with a tank level gauge (6) for displaying the odorant water level in the odorant storage tank (0).

8. An odorizing device for an LPG filling station according to claim 1, characterized in that, The odorant storage tank (0) is also provided with a storage tank safety accessory reserved port (13) for installing safety accessories.

9. An odorizing device for an LPG filling station according to claim 8, characterized in that, The safety accessory is a pressure gauge or a safety valve.

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