Constant-pressure liquid ammonia storage tank

Abstract

The utility model relates to a constant pressure liquid ammonia storage tank, which comprises a tank body and a nitrogen inflation system, the tank body comprises a main tank body, an end cover and a flexible lining, a thermal insulation layer is arranged outside the tank body, the flexible lining is arranged inside the tank body and isolates the main tank body from the chamber space of the end cover, the chamber of the main tank body is filled with liquid ammonia, and the chamber of the end cover is filled with nitrogen. A liquid ammonia filling port and a liquid outlet are formed in the other end of the main tank body; and a nitrogen filling port, a pressure release valve and a pressure gauge are arranged on the end cover. According to the utility model, the pressure in the tank body can be increased by utilizing the nitrogen inflation system for pressurizing and stabilizing the liquid ammonia in the main tank body, so that the liquid outlet stability of the system is improved; the nitrogen chamber and the liquid ammonia chamber are isolated by a flexible material, and expand or contract according to the pressure change to balance the pressure on the two sides; and a thermal insulation material is arranged outside the tank body to keep the temperature of the tank body relatively stable.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia storage tanks, in particular to a constant pressure liquid ammonia storage tank. Background Art

[0002] Hydrogen and ammonia are two carbon-free fuels that produce no CO2 when burned. They are promising alternatives to fossil fuels, reducing carbon emissions and alleviating environmental pollution. However, the current development of hydrogen energy faces critical challenges, such as poor safety and immature storage and transportation technologies, which hinder its industrialization. Ammonia is a key chemical raw material for modern industry and agricultural fertilizers. It is also a natural hydrogen storage medium, boasting a high hydrogen content of 17.6%, enabling efficient hydrogen storage. Furthermore, ammonia offers advantages such as high energy density, ease of liquefaction, storage, and transportation, and high safety.

[0003] Ammonia gas is required for research related to ammonia energy applications, including development experiments such as ammonia power and ammonia combustion. The existing method of storing and transporting ammonia is a liquid ammonia pressure tank. The saturation pressure of liquid ammonia is sensitive to temperature. Therefore, the pressure inside the liquid ammonia tank varies greatly with temperature, and the pressure at the liquid outlet is unstable, which has an adverse effect on ammonia energy development experiments and applications. Existing solutions generally involve heating the tank or adding an ammonia pump, both of which require additional equipment investment, and the pressure and flow are difficult to control. Therefore, it is very necessary to design a constant-pressure liquid ammonia storage tank to maintain a constant pressure inside the tank and to provide a stable supply of liquid ammonia to the outside. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a constant-pressure liquid ammonia storage tank for stably supplying liquid ammonia.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is as follows:

[0006] A constant pressure liquid ammonia storage tank comprises a tank body and a nitrogen charging system. The tank body comprises a main tank body, an end cover and a flexible lining, and an insulation layer is provided on the outside of the tank body.

[0007] The flexible liner is placed between the main tank body and the end cover, shrinking inside the end cover cavity or expanding inside the main tank body cavity to balance the pressure of the cavities on both sides;

[0008] The other end of the main tank body is provided with a liquid filling port and a liquid outlet;

[0009] The liquid filling port is used for filling liquid ammonia, and the liquid outlet can output liquid ammonia at a set pressure to connect to external ammonia equipment;

[0010] The end cover is provided with an air filling port, a pressure relief valve and a pressure gauge;

[0011] The nitrogen charging system includes a nitrogen cylinder, a pressure regulating valve, a stop valve and a one-way valve;

[0012] The nitrogen cylinder is a high-pressure nitrogen cylinder with an air outlet, and the high-pressure nitrogen is a consumable material;

[0013] The pressure regulating valve is connected to the gas outlet of the nitrogen cylinder, one end of the stop valve is connected to the outlet of the pressure regulating valve, the other end of the stop valve is connected to the inlet of the one-way valve, and the outlet of the one-way valve is connected to the inflation port of the end cover;

[0014] Furthermore, the insulation layer material is foamed polyurethane.

[0015] Furthermore, the main tank body and the end cover are made of stainless steel.

[0016] Furthermore, the flexible lining is made of ammonia-resistant rubber such as chloroprene rubber and ethylene propylene rubber.

[0017] Furthermore, the tank body is composed of two chambers, namely the main tank body and the end cover, and the chamber spaces of the two chambers are isolated by a flexible liner arranged therebetween.

[0018] Furthermore, the pressure gauge is used to display the pressure inside the tank.

[0019] Furthermore, the pressure relief valve can release nitrogen at an overpressure to reduce the pressure inside the tank.

[0020] Furthermore, the pressure of the liquid ammonia tank can be adjusted according to the actual application scenario to set the pressure of the pressure regulating valve and the pressure relief valve.

[0021] The beneficial effects of the utility model are:

[0022] 1. The nitrogen inside the system is used for inflation and pressurization, eliminating the need for additional heating, liquid ammonia pumps and other equipment, and avoiding additional energy consumption of the system;

[0023] 2. The internal chamber space of the tank is isolated by a flexible lining, and the liquid ammonia is not contaminated by other media;

[0024] 3. The flexible lining shrinks in the end cover chamber when liquid ammonia is filled, and expands in the main tank chamber when liquid ammonia is pressurized. It expands when pressurization is required, and basically does not occupy the effective filling volume of the tank;

[0025] 4. The inflation pressure is automatically balanced by the one-way valve and the pressure relief valve, reaching the set pressure value immediately and stabilizing the liquid ammonia outlet pressure;

[0026] 5. The outside of the tank is equipped with thermal insulation material to reduce heat loss and keep the tank temperature relatively constant;

[0027] 6. The end cover is equipped with a pressure relief valve to prevent the tank from over-pressurizing, and the pressure relief gas is only nitrogen, which is safe and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a side view of a constant pressure liquid ammonia storage tank proposed in Example 1;

[0029] Figure 2 This is a schematic diagram of the internal structure of a constant-pressure liquid ammonia storage tank proposed in Example 1;

[0030] In the figure, the reference numbers are: 1-tank body, 101-main tank body, 102-flexible lining, 103-end cover, 104-filling port, 105-pressure relief valve, 106-pressure gauge, 107-liquid filling port, 108-liquid outlet, 109-insulation layer, 2-nitrogen filling system, 201-nitrogen cylinder, 202-gas outlet, 203-pressure regulating valve, 204-stop valve, 205-check valve. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0032] The present invention will be further explained below in conjunction with specific embodiments.

[0033] Example 1

[0034] refer to Figure 1 A constant pressure liquid ammonia storage tank in this embodiment includes a tank body 1 and a nitrogen charging system 2.

[0035] like Figure 2 As shown, the tank body 1 includes a main tank body 101, an end cover 103 and a flexible lining 102; the effective volume space of the tank body 1 is composed of the chamber space formed by the main tank body 101 and the end cover 103, and the flexible lining 102 is placed between the two to isolate the main tank body 101 and the end cover 103.

[0036] Preferably, a heat-insulating layer 109 is provided on the outside of the tank body 1 .

[0037] Preferably, a liquid filling port 107 and a liquid outlet 108 are provided at the bottom end of the main tank body 101 .

[0038] Preferably, the liquid filling port 107 is used for filling liquid ammonia, and the liquid outlet 108 outputs liquid ammonia at a set pressure to be connected to an external ammonia device.

[0039] Preferably, the end cover 103 is provided with an air filling port 104 , a pressure relief valve 105 and a pressure gauge 106 .

[0040] Preferably, the flexible lining 102 is made of flexible material and is placed between the main tank body 101 and the end cover 103, shrinking inside the end cover 103 or expanding inside the main tank body 101; isolating the main tank body 101 and the end cover 103 and balancing the pressure of the chambers on both sides.

[0041] The volume space of the tank body 1 is composed of a main tank body 101 and an end cover 103. The main tank body 101 and the end cover 103 are both chamber structures, and the two are separated by a flexible liner 102 arranged therebetween. The flexible liner contracts or expands to balance the pressure in the two chambers.

[0042] The nitrogen charging system 2 includes a nitrogen cylinder 201 , and a gas outlet 202 is provided on the nitrogen cylinder 201 .

[0043] The nitrogen charging system 2 further includes a pressure regulating valve 203, a stop valve 204 and a one-way valve 205; the pressure regulating valve 203 is connected to the nitrogen cylinder gas outlet 202, one end of the stop valve 204 is connected to the outlet of the pressure regulating valve 203, the other end of the stop valve 204 is connected to the inlet of the one-way valve 205, and the outlet of the one-way valve 205 is connected to the charging port 104;

[0044] Preferably, the nitrogen cylinder 201 is a high-pressure nitrogen cylinder, and high-pressure nitrogen is a consumable;

[0045] Preferably, the material of the thermal insulation layer 109 is foamed polyurethane.

[0046] Preferably, the main tank body 101 and the end cover 103 are made of stainless steel.

[0047] Preferably, the flexible lining 102 is made of ammonia-resistant rubber such as chloroprene rubber and ethylene propylene rubber.

[0048] The pressure regulating valve 203 sets the inflation pressure, and the one-way valve 205 is opened for inflation. When the chamber pressure of the main tank body 101 is lower than the set value, nitrogen is filled into the chamber of the end cover 103 to increase the pressure, and the flexible lining 102 expands and squeezes the main tank body 101, and the pressure in the chamber space increases. When the pressure in the chamber increases to the set value, the one-way valve 205 is closed to stop inflation.

[0049] The pressure relief valve 105 releases nitrogen under overpressure. When the chamber pressure of the main tank body 101 is higher than the set value, the flexible liner 102 shrinks in the chamber space of the end cover 103, the one-way valve 205 is closed, and the pressure relief valve 105 opens to exhaust until the pressure in the tank body 1 drops to the set value.

[0050] Preferably, the pressure of the liquid ammonia storage tank can be set according to actual application needs; the inflation pressure is jointly controlled by the one-way valve 205 and the pressure relief valve 105 to reach the set pressure value immediately.

[0051] When the constant pressure liquid ammonia storage tank operates normally, the liquid ammonia pressure in the tank is constant at a set value, and the liquid outlet 108 can supply liquid ammonia with stable pressure to the outside.

Claims

1. A constant pressure liquid ammonia storage tank, characterized in that: It includes a tank body (1) and a nitrogen filling system (2); The tank body (1) comprises a main tank body (101), an end cover (103) and a flexible lining (102); The outside of the tank body (1) is provided with a heat-insulating layer (109); The bottom end of the main tank body (101) is provided with a liquid filling port (107) and a liquid outlet (108); The liquid filling port (107) is used for filling liquid ammonia, and the liquid outlet (108) outputs liquid ammonia at a set pressure and is connected to an external ammonia device; The end cover (103) is provided with an air filling port (104), a pressure relief valve (105) and a pressure gauge (106); The flexible lining (102) is placed between the main tank body (101) and the end cover (103); the main tank body (101) and the end cover (103) are both chamber structures; the flexible lining (102) contracts inside the chamber of the end cover (103) or expands inside the chamber of the main tank body (101); The nitrogen charging system (2) comprises a nitrogen bottle (201), and the nitrogen bottle (201) is provided with a gas outlet (202); The nitrogen charging system (2) comprises a pressure regulating valve (203), a stop valve (204) and a one-way valve (205); The pressure regulating valve (203) is connected to the gas outlet (202) of the nitrogen cylinder, one end of the stop valve (204) is connected to the outlet of the pressure regulating valve (203), the other end of the stop valve (204) is connected to the inlet of the one-way valve (205), and the outlet of the one-way valve (205) is connected to the inflation port (104).

2. A constant pressure liquid ammonia storage tank according to claim 1, characterized in that: The volume space of the tank body (1) is composed of the main tank body (101) and the chamber of the end cover (103), and the two chambers are isolated by a flexible liner (102), and the pressure of the two chambers is balanced.

3. A constant pressure liquid ammonia storage tank according to claim 1, characterized in that: The pressure regulating valve (203) sets the inflation pressure. When the pressure in the chamber of the main tank body (101) is lower than the set value, nitrogen is filled into the chamber of the end cover (103) to increase the pressure. The flexible lining (102) expands and squeezes the chamber space of the main tank body (101). When the pressure in the chamber rises to the set value, the one-way valve (205) closes and inflation stops.

4. A constant pressure liquid ammonia storage tank according to claim 1, characterized in that: The pressure relief valve (105) releases nitrogen under overpressure. When the chamber pressure of the main tank body (101) is higher than a set value, the flexible liner (102) is squeezed and contracted in the chamber space of the end cover (103), the one-way valve (205) is closed, and the pressure relief valve (105) is opened to exhaust until the pressure in the tank body (1) drops to the set value.

5. A constant pressure liquid ammonia storage tank according to claim 1, characterized in that: The pressure gauge (106) displays the pressure inside the tank (1) in real time.

6. A constant pressure liquid ammonia storage tank according to claim 1, characterized in that: The nitrogen cylinder (201) is a high-pressure nitrogen cylinder.

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