Methanol liquid fuel nitrogen pressurized storage tank and working method thereof

Abstract

The application discloses a kind of methanol liquid fuel nitrogen pressurization storage tank and its working method, belong to pressure vessel technical field.The both sides of the top of tank body are respectively fixedly connected with protective handle, and the top of tank body is equipped with liquid inlet, vacuumizing and nitrogen filling port and pressure gauge between the two protective handles of the top of tank body, and the liquid inlet is connected with liquid inlet valve, and the vacuumizing and nitrogen filling port is connected with inlet valve;The upper end of central cannula is stretched out the top of tank body and is fixedly connected with the top of tank body, and the lower end of central cannula is stretched into the inside of tank body;Tank body bottom is fixedly connected with a plurality of base, and tank body bottom is equipped with blowdown port.The application utilizes nitrogen pressure to drive fuel flow, does not need additional pump as power source, and nitrogen is inert gas, does not react with methanol at normal temperature, and it is safe and reliable;It does not need to use high storage tank, avoids the risk of leakage that is prone to occur in use or filling process, and is convenient for user to use.And the application can be directly connected with existing market fuel stove, without any modification.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pressure vessels, and particularly relates to a methanol liquid fuel nitrogen pressurized storage tank and a working method thereof. BACKGROUND

[0002] Alcohol-based fuel refers to liquid fuel configured mainly of methanol, and as a new type of alternative energy for adjusting the structure of traditional energy and promoting the development of circular economy, it has great development space in the rural-urban fringe areas where natural gas cannot cover, especially in some catering, hotel and other industries in such areas and in the vast rural areas.

[0003] At present, the installation and use mode of the storage tank used by small catering stores on the market is mostly the use method of diesel in diesel stove, that is, the liquid level difference generated by the high oil tank is utilized. The tank body is mainly made of plastic or thin iron sheet. However, methanol is a flammable liquid, and its vapor can form an explosive mixture with air under a certain concentration, and it can cause combustion and explosion when encountering open fire and high heat. Therefore, the existing storage tank mode is prone to leakage risk during use or filling, and there is a great safety hazard. SUMMARY

[0004] In order to solve the above-mentioned existing problems, the purpose of the present application is to provide a methanol liquid fuel nitrogen pressurized storage tank and a working method thereof, which can stably deliver methanol fuel to the combustion stove and directly interface with the existing alcohol-based stove, and has good safety and economic benefits.

[0005] The application is implemented by the following technical solutions:

[0006] The methanol liquid fuel nitrogen pressurized storage tank disclosed by the application comprises a tank body and a center insertion pipe, the two sides of the top of the tank body are fixedly connected with protective handles, a liquid inlet, a vacuumizing and nitrogen charging port and a pressure gauge are arranged between the two protective handles at the top of the tank body, the liquid inlet is connected with a liquid inlet valve, and the vacuumizing and nitrogen charging port is connected with an air inlet valve; the upper end of the center insertion pipe extends out of the top of the tank body and is fixedly connected with the top of the tank body, and the lower end of the center insertion pipe extends into the tank body; a plurality of bases are fixedly connected to the bottom of the tank body, and a pollution discharge port is arranged at the bottom of the tank body.

[0007] Preferably, the tank body comprises a cylinder, a head and a bottom, and the head and the bottom are respectively welded and fixed with the two ends of the cylinder.

[0008] Preferably, a liquid level meter is arranged on one side of the tank body.

[0009] Preferably, a quick connector is arranged at the center of the top of the tank body, the upper end of the center insertion pipe is connected with one end of the quick connector, and the other end of the quick connector is connected with the stove through a stainless steel corrugated pipe.

[0010] Preferably, the diameter of the center insertion pipe is 1.5±0.1 mm.

[0011] Preferably, a sealing device is arranged between the central cannula and the tank body, and the sealing device is made of fluororubber or EPDM.

[0012] Preferably, the upper limit of the liquid filling coefficient of the tank body is 0.8.

[0013] The working method of the above-mentioned methanol liquid fuel nitrogen pressurized storage tank, comprising

[0014] S1: opening the inlet valve, vacuumizing the tank body, and closing the inlet valve after reaching the preset vacuum degree;

[0015] S2: opening the liquid inlet valve, injecting methanol into the tank body through the explosion-proof pump, and closing the liquid inlet valve when the weight of the methanol meets the preset filling requirement;

[0016] S3: connecting the inlet valve with the nitrogen source, injecting nitrogen into the tank body, and controlling the filling nitrogen pressure through the pressure gauge, and closing the inlet valve when the pressure reaches the preset value;

[0017] S4: nitrogen pressure drives methanol to be delivered to the stove through the central cannula for combustion; when filling is needed, S2 and S3 are repeated for filling; when the methanol in the tank body is completely released and air is mixed in the tank body, S1, S2 and S3 are repeated for filling.

[0018] Preferably, in S1, the volume content of oxygen in the tank body is less than 5% when the tank body is vacuumized.

[0019] Preferably, when the methanol filling coefficient is 0.8, the nitrogen injection pressure is 3.8-4.1*10 5 Pa; when the filling coefficient is 0.75, the nitrogen injection pressure is 2.9-3.1*10 5 Pa.

[0020] Compared with the prior art, the present application has the following beneficial technical effects:

[0021] The nitrogen pressurized methanol liquid fuel storage tank provided by the application adopts a nitrogen pressurization mode to provide methanol or alcohol-based liquid fuel for a cooking appliance, and does not need an additional pump as a power source. Nitrogen is selected as the pressurizing gas because nitrogen has the following advantages: a wide source and a relatively low price; as an inert gas, nitrogen does not react with methanol at room temperature, is not flammable and explosive, and has a high safety factor; nitrogen is always in the upper part of methanol liquid in the steel cylinder, and can stably transport liquid fuel from the fuel output pipe to the corresponding combustion cooking appliance. The nitrogen-driven methanol flow in the storage tank can be considered as an isothermal change process, and by setting different filling conditions of methanol, the minimum nitrogen injection pressure required, i.e., the reasonable and economic pressure of nitrogen, can be calculated under the condition that the corresponding flow requirement of the heat load of the cooking appliance is met. The nitrogen pressure can finally ensure that the methanol fuel is stably transported to the combustion cooking appliance, and can be directly connected to the existing alcohol-based cooking appliance, and has good economic benefits. The high-level storage tank is not needed, and the risk of leakage during use or filling is avoided, and the user can use it conveniently without any modification, and the fuel cooking appliance can be directly connected to the existing alcohol-based cooking appliance. At the same time, the two protective handles at the top of the tank body can facilitate carrying, and can protect the pressure gauge, the air inlet valve and the liquid inlet valve in the middle to prevent the valves from being damaged and causing leakage during storage and transportation.

[0022] Further, a liquid level gauge is arranged on one side of the tank body, and the injection volume of methanol can be directly displayed.

[0023] Further, a quick connector is arranged at the center of the top of the tank body, so that the replacement process is safe and fast.

[0024] Further, the diameter of the center pipe is 1.5±0.1 mm, if the pipe diameter is too large, a small change in the valve adjustment will have a great influence on the flow, and if the pipe diameter is too small, the probability of blocking the center pipe by impurities and foreign matters will increase.

[0025] Further, since methanol has swelling and cracking effects on ordinary rubber and plastic, fluororubber or ternary ethylene-propylene rubber which is not soluble in alcohol is selected as the sealing material.

[0026] The working method of the above-mentioned nitrogen pressurized methanol liquid fuel storage tank is simple in steps, safe and convenient in operation, fully considers the operation steps of the two cases of using and filling as needed and completely releasing methanol, and improves the safety. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front view of the overall structure of the application;

[0028] Figure 2 It is a top view of the overall structure of the application.

[0029] In the figure: 1 is a cylinder, 2 is a head, 3 is a bottom, 4 is a center tube, 5 is a base, 6 is a protective handle, 7 is an air inlet valve, 8 is a liquid inlet valve, 9 is a pressure gauge, and 10 is a liquid level gauge. DETAILED DESCRIPTION

[0030] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments, which are an explanation of the application rather than a limitation thereof:

[0031] As Figure 1 and Figure 2 , the methanol liquid fuel nitrogen pressurized storage tank of the application comprises a tank body and a center tube 4, two protective handles 6 are fixedly connected to the top of the tank body, a liquid inlet, a vacuumizing and nitrogen filling port and a pressure gauge 9 are arranged between the two protective handles 6 on the top of the tank body, the liquid inlet is connected with a liquid inlet valve 8, and the vacuumizing and nitrogen filling port is connected with an air inlet valve 7; the upper end of the center tube 4 extends out of the top of the tank body and is fixedly connected with the top of the tank body, and the lower end of the center tube 4 extends into the tank body; a plurality of bases 5 are fixedly connected to the bottom of the tank body, and the bottom of the tank body is provided with a blowdown port for discharging accumulated liquid.

[0032] In a preferred embodiment of the application, the tank body comprises a cylinder 1, a head 2 and a bottom 3, and the head 2 and the bottom 3 are respectively welded and fixed with the two ends of the cylinder 1. The size and thickness of the tank body meet the design requirements of the national standard pressure vessel (GB150-2011) and meet the safety requirements. The tank body contains two circumferential welds, a main weld and an angle weld of the valve seat, and full penetration welding is adopted; the protective handle 6 is connected with the head 2 by welding; the base 5 is welded on the bottom 3 and has a certain height, maintaining a certain distance from the ground level. The tank body is preferably made of 304 stainless steel.

[0033] In a preferred embodiment of the application, the surface of the tank body is provided with an identification mark indicating the corresponding fuel.

[0034] In a preferred embodiment of the application, the tank body is provided with a liquid level gauge 10 on one side.

[0035] In a preferred embodiment of the application, a quick connector is arranged at the center of the top of the tank body, the upper end of the center tube 4 is connected with one end of the quick connector, and the other end of the quick connector is connected with a stove through a stainless steel corrugated pipe.

[0036] In a preferred embodiment of the application, the diameter of the center tube 4 is 1.5±0.1mm. Through theoretical calculation and experimental verification, if the inner diameter of the tube is greater than 1.6mm, a small change in valve adjustment will have a great impact on the flow; if the tube diameter is too small, such as less than 1mm, the probability of the center tube being blocked by impurities and foreign matters will increase.

[0037] In a preferred embodiment of the present application, a sealing device, preferably an O-ring, is arranged between the central insertion tube 4 and the tank body, and the sealing device is made of fluororubber or EPDM.

[0038] In a preferred embodiment of the present application, the upper limit of the liquid filling coefficient of the tank body is 0.8.

[0039] The working method of the above-mentioned methanol liquid fuel nitrogen pressurized storage tank comprises the following steps:

[0040] S1: opening the air inlet valve 7 to vacuumize the tank body, and closing the air inlet valve 7 after reaching the preset vacuum degree;

[0041] S2: opening the liquid inlet valve 8 to inject methanol into the tank body through the explosion-proof pump, and closing the liquid inlet valve 8 when the weight of the methanol meets the preset filling requirement;

[0042] S3: connecting the air inlet valve 7 with the nitrogen source to inject nitrogen into the tank body, and controlling the filling nitrogen pressure through the pressure gauge 9, and closing the air inlet valve 7 when the pressure reaches the preset value;

[0043] S4: the nitrogen pressure drives the methanol to be delivered to the stove through the central insertion tube 4 for combustion; when filling is needed, S2 and S3 are repeated for filling; when the methanol in the tank body is completely released and air is mixed in the tank body, S1, S2 and S3 are repeated for filling.

[0044] In a preferred embodiment of the present application, in S1, the volume content of oxygen in the tank body is less than 5% when the tank body is vacuumized.

[0045] In a preferred embodiment of the present application, when the methanol filling coefficient is 0.8, the nitrogen injection pressure is 3.8-4.1*10 5 Pa; and when the filling coefficient is 0.75, the nitrogen injection pressure is 2.9-3.1*10 5 Pa.

[0046] The use and filling conditions of the storage tank of the present application are further explained and described below with a specific embodiment:

[0047] In the embodiment, for the actual tank volume of 50L, by setting different filling conditions of methanol and calculating the minimum driving pressure under the flow requirement, the reasonable nitrogen injection pressure can be obtained, as shown in Table 1. In the actual use process, on the basis of the determined liquid fuel filling amount and nitrogen filling pressure, the methanol content in the tank can be determined through the pressure gauge or the stainless steel glass tube liquid level gauge, as shown in Table 2. When the methanol content is lower than the lower limit of the liquid level, it is timely supplemented. In the embodiment, different specifications of stainless steel pipe insertion tubes are tested, and the preferred insertion tube inner diameter is 1.5mm.

[0048] Table 1 nitrogen injection pressure corresponding to different filling conditions

[0049]

[0050]

[0051] Table 2 pressure and fuel quality change in the tank (filling coefficient 0.75)

[0052] Methanol content (volume ratio) pressure * 10 5 Pa]] Methanol mass kg 0.75 3.00 28.8 0.7 2.30 26.9 0.65 1.86 24.9 0.6 1.53 23.0 0.55 1.30 21.1 0.5 1.08 19.2 0.45 0.91 17.3 0.4 0.77 15.4 0.35 0.65 13.4 0.3 0.55 11.5 0.25 0.46 9.6 0.2 0.38 7.7 0.15 0.32 5.8 0.1 0.25 3.8 0.05 0.20 1.9

[0053] The above only describes the embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, or equivalent structures or equivalent process conversions made by using the content of the present application and the drawings, or direct or indirect application in other related technical fields, which should be covered in the protection scope of the present application.

Claims

1. A method of operating a methanol liquid fuel nitrogen pressurized storage tank, characterized by, The application relates to a methanol liquid fuel nitrogen pressurized storage tank, which comprises a tank body and a center pipe (4) with a diameter of 1.5+ / -0.1 mm, two protective handles (6) are fixedly connected to the top of the tank body, a liquid inlet, a vacuumizing and nitrogen filling port and a pressure gauge (9) are arranged between the two protective handles (6) on the top of the tank body, the liquid inlet is connected with a liquid inlet valve (8), the vacuumizing and nitrogen filling port is connected with an air inlet valve (7), the upper end of the center pipe (4) extends out of the top of the tank body and is fixedly connected with the top of the tank body, the lower end of the center pipe (4) extends into the tank body, a liquid level meter (10) is arranged on one side of the tank body, a plurality of bases (5) are fixedly connected to the bottom of the tank body, a sewage outlet is arranged on the bottom of the tank body, the upper limit of the liquid loading coefficient of the tank body is 0.8, a quick connector is arranged in the center of the top of the tank body, the upper end of the center pipe (4) is connected with one end of the quick connector, the other end of the quick connector is connected with a stove through a stainless steel corrugated pipe, a sealing device is arranged between the center pipe (4) and the tank body, and the sealing device is made of fluorine rubber or EPDM rubber. S1: the air inlet valve (7) is opened, the tank body is vacuumized, the air inlet valve (7) is closed after the preset vacuum degree is reached, and the volume content of oxygen in the tank body is less than 5% when the tank body is vacuumized; S2: the liquid inlet valve (8) is opened, methanol is injected into the tank body through an explosion-proof pump, the liquid inlet valve (8) is closed when the weight of the methanol meets the preset filling requirement; S3: connect the inlet valve (7) with the nitrogen source, inject nitrogen into the tank, control the filling nitrogen pressure through the pressure gauge (9), when the pressure reaches the preset value, close the inlet valve (7); when the methanol filling coefficient is 0.8, the nitrogen injection pressure is 3.8~4.1*10 5 Pa; when the filling coefficient is 0.75, the nitrogen injection pressure is 2.9~3.1*10 5 Pa; S4: nitrogen pressure drives methanol to be delivered to the stove through the center pipe (4) for combustion; when filling is needed, S2 and S3 are repeated for filling; when the methanol in the tank body is completely released and air is mixed in the tank body, S1, S2 and S3 are repeated for filling.

2. The working method of the methanol liquid fuel nitrogen pressurized storage tank according to claim 1, characterized in that, The tank body comprises a cylinder (1), a head (2) and a bottom (3), and the head (2) and the bottom (3) are respectively welded and fixed with two ends of the cylinder (1).

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