Ammonia reception facility

Abstract

To suppress a supply amount of nitrogen gas recovered from a nitrogen gas use apparatus to a detoxification facility in an ammonia reception facility for vaporizing and supplying the ammonia liquid to a supply destination.SOLUTION: An ammonia reception facility includes: a boil-off gas supply section 4 capable of supplying boil-off gas G generated in an ammonia tank 2 to an ammonia gas delivery section 3; a nitrogen gas recovery section 5 that supplies nitrogen gas N recovered from a nitrogen gas use apparatus to the boil-off gas supply section 4 and mixing the nitrogen gas with the boil-off gas G; a gas analyzer 7 that detects gas heat quantity of the ammonia gas delivered from the ammonia gas delivery section 3; a treatment facility 6 capable of separating the nitrogen gas N from the boil-off gas and supplying the nitrogen gas to a ground flare F; and a control section 8 that causes the boil-off gas supply section 4 to supply the boil-off gas G to the treatment facility 6 when the gas heat quantity is lower than a predetermined threshold value.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to ammonia receiving equipment.

Background Art

[0002] For example, Patent Document 1 discloses a combustion device capable of burning ammonia as fuel. The combustion device disclosed in Patent Document 1 is installed in a boiler and co - burns ammonia supplied from an ammonia supply source with pulverized coal.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Large boilers that use LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas) as fuel are equipped with receiving facilities for storing LNG and the like. Such receiving facilities vaporize fuels such as LNG and supply the required amount of vaporized gas to boilers and gas turbines. Such receiving facilities are provided with equipment that uses nitrogen gas for maintenance, shaft seals of rotating equipment, replacement operations of process fluids, etc. Since the nitrogen gas used in such operations contains vaporized gas such as LNG, it is often returned to the process piping and finally sent to the power generation facility as part of the fuel gas. However, ammonia gas is less combustible compared to fossil fuels such as LNG and LPG. Therefore, supplying a large amount of nitrogen gas, which is an inert gas, to the boiler may inhibit stable combustion. On the other hand, since ammonia gas is toxic, it is necessary to remove it with a detoxification facility such as a ground flare and then release it into the atmosphere. If the entire amount of nitrogen gas mixed with ammonia is treated with a detoxification facility such as a ground flare, it will lead to an increase in the size of the detoxification facility. Also, if a large amount of fossil fuel is required for the detoxification facility, it will go against the demands of the times aiming for decarbonization.

[0005] The present invention has been made in view of the above-described problems, and an object of the present invention is to be able to suppress the supply amount of nitrogen gas recovered from nitrogen gas-using equipment to a detoxification facility in an ammonia receiving facility that vaporizes and supplies liquid ammonia to a supply destination.

Means for Solving the Problems

[0006] As a means for solving the above problems, the present invention adopts the following configuration.

[0007] A first aspect of the present invention is an ammonia receiving facility including an ammonia tank for storing an ammonia solution and an ammonia gas sending unit for vaporizing the ammonia solution and sending it toward a supply destination. The facility includes a boil-off gas supply unit capable of supplying boil-off gas generated in the ammonia tank to the ammonia gas sending unit, a nitrogen gas recovery unit for supplying nitrogen gas recovered from a nitrogen gas using device to the boil-off gas supply unit and mixing it with the boil-off gas, a gas calorific value detection unit for detecting the calorific value of the ammonia gas sent out from the ammonia gas sending unit, a treatment facility capable of separating the nitrogen gas from the boil-off gas and supplying it to a decontamination facility, and a control unit for causing the boil-off gas supply unit to supply the boil-off gas to the treatment facility when the gas calorific value is lower than a predetermined threshold value.

Advantages of the Invention

[0008] According to the present invention, the nitrogen gas recovered by the nitrogen gas recovery unit is mixed with the boil-off gas and further mixed with ammonia gas (vaporized gas) and sent to the supply destination. When the calorific value of the ammonia gas sent to the supply destination is higher than a predetermined threshold value, the boil-off gas is supplied to the supply destination. On the other hand, when the calorific value of the ammonia gas supplied to the supply destination is lower than a predetermined threshold value, the boil-off gas is supplied to the treatment facility instead of being sent to, for example, a gas supply pipe. When the boil-off gas is supplied to the treatment facility, for example, a gas containing a large amount of nitrogen that has not been reliquefied by a condenser is separated from the boil-off gas and supplied to the decontamination facility. Thus, the present invention supplies nitrogen gas to the decontamination facility only when the concentration of nitrogen gas contained in the ammonia gas supplied to the supply destination is high and the calorific value of the mixed gas is lower than a predetermined threshold value. Therefore, according to the present invention, in an ammonia receiving facility for vaporizing an ammonia solution and supplying it to a supply destination, the supply amount of nitrogen gas recovered from a nitrogen gas using device to the decontamination facility can be suppressed.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, an embodiment of an ammonia receiving facility according to the present invention will be described.

[0011] (First Embodiment) FIG. 1 is a flowchart showing a schematic configuration of the ammonia receiving facility 1 of the present embodiment. The ammonia receiving facility 1 of the present embodiment stores the ammonia liquid X. Further, the ammonia receiving facility 1 of the present embodiment vaporizes the stored ammonia liquid X into ammonia gas Y. Further, the ammonia receiving facility 1 of the present embodiment supplies a required amount of ammonia gas Y to the boiler B (destination). Note that the destination of the ammonia gas Y of the ammonia receiving facility 1 may also be a gas turbine or the like, and is not limited to the boiler B.

[0012] [[ID=(24)]]As shown in FIG. 1, the ammonia receiving facility 1 of the present embodiment includes an ammonia tank 2, an ammonia gas delivery unit 3, a boil-off gas supply unit 4, a nitrogen gas recovery unit 5, a treatment facility 6, a gas analyzer 7 (gas calorific value detection unit), and a control unit 8.

[0013] The ammonia tank 2 is a tank that stores the ammonia liquid X. The ammonia tank 2 stores the ammonia liquid X supplied from the outside while keeping it at a low temperature. The ammonia tank 2 is, for example, a PC concrete double-shell tank including a metal inner shell and a PC concrete liquid retaining dike. The ammonia tank 2 includes, for example, a heat insulating material filled between the liquid retaining dike and the inner shell, and stores the ammonia liquid X inside the inner shell in a low-temperature state. However, the structure of the ammonia tank 2 is not particularly limited.

[0014] The ammonia gas delivery unit 3 vaporizes the ammonia liquid X and delivers it toward the boiler B. As shown in FIG. 1, the ammonia gas delivery unit 3 includes a discharge pump 3a, a discharge pipe 3b, a vaporization facility 3c, and a gas delivery pipe 3d.

[0015] The discharge pump 3a is disposed inside the ammonia tank 2 and pumps the ammonia liquid X stored in the ammonia tank 2 to the outside of the ammonia tank 2. The discharge pump 3a is connected to, for example, the control unit 8 and discharges a specified amount of the ammonia liquid X to the outside of the ammonia tank 2 based on the control of the control unit 8.

[0016] The discharge pipe 3b is a pipe connecting the ammonia tank 2 and the vaporization facility 3c. The upstream end of the discharge pipe 3b is connected to the ammonia tank 2, and the downstream end of the discharge pipe 3b is connected to the vaporization facility 3c. The discharge pipe 3b guides the ammonia liquid X discharged by the discharge pump 3a from the ammonia tank 2 to the vaporization facility 3c.

[0017] The vaporization facility 3c heats and vaporizes the ammonia liquid X. The vaporization facility 3c vaporizes the ammonia liquid X supplied from the ammonia tank 2 via the discharge pipe 3b. For example, the vaporization facility 3c is connected to a heating fluid supply unit (not shown), and a heating fluid such as seawater is supplied. The vaporization facility 3c vaporizes the ammonia liquid X by exchanging heat between the ammonia liquid X and the heating fluid such as seawater.

[0018] The gas delivery pipe 3d is a pipe connecting the vaporization facility 3c and the boiler B. The upstream end of the gas delivery pipe 3d is connected to the vaporization facility 3c, and the downstream end of the gas delivery pipe 3d is connected to the boiler B. Note that the downstream end of the gas delivery pipe 3d does not necessarily need to be directly connected to the boiler B. That is, the downstream end of the gas delivery pipe 3d may be connected to the boiler B via other equipment or the like. The gas delivery pipe 3d guides the ammonia gas Y discharged from the vaporization facility 3c from the vaporization facility 3c to the boiler B.

[0019] Note that the vaporization facility 3c may be provided with a superheater at an intermediate portion of the gas supply pipe 3d. The superheater vaporizes the mist-like ammonia liquid X contained in the ammonia gas Y flowing through the gas supply pipe 3d.

[0020] The boil-off gas supply unit 4 can supply the boil-off gas G generated in the ammonia tank 2 to the ammonia gas delivery unit 3. As shown in FIG. 1, the boil-off gas supply unit 4 includes a boil-off gas main pipe 4a (first pipe), a first on-off valve 4b, a boil-off gas treatment facility connection pipe 4c (second pipe), a second on-off valve 4d, a boil-off gas compressor 4e, and an emergency exhaust pipe 4f.

[0021] The boil-off gas main pipe 4a is a pipe connected to the ammonia gas delivery unit 3. The upstream end of the boil-off gas main pipe 4a is connected to the ammonia tank 2, and the downstream end of the boil-off gas main pipe 4a is connected to the ammonia gas delivery unit 3. Further, the downstream end of the boil-off gas main pipe 4a is connected to the gas supply pipe 3d of the ammonia gas delivery unit 3. Such a boil-off gas main pipe 4a guides the boil-off gas G generated inside the ammonia tank 2 from the ammonia tank 2 to the gas supply pipe 3d.

[0022] The first on-off valve 4b is an on-off valve installed at an intermediate portion of the boil-off gas main pipe 4a. The first on-off valve 4b is opened and closed under the control of the control unit 8. The first on-off valve 4b is located at an intermediate portion of the boil-off gas main pipe 4a, near the downstream end of the boil-off gas main pipe 4a. Such a first on-off valve 4b is located on the downstream side of the portion where the boil-off gas treatment facility connection pipe 4c of the boil-off gas main pipe 4a is connected. The boil-off gas G is supplied to the gas supply pipe 3d in a state where such a first on-off valve 4b is open. Further, when the first on-off valve 4b is closed, the supply of the boil-off gas G to the gas supply pipe 3d is stopped.

[0023] The boil-off gas treatment facility connection pipe 4c is a pipe that connects the boil-off gas main pipe 4a and the treatment facility 6. The upstream end of the boil-off gas treatment facility connection pipe 4c is connected to the boil-off gas main pipe 4a, and the downstream end of the boil-off gas treatment facility connection pipe 4c is connected to the treatment facility 6. Also, the upstream end of the boil-off gas treatment facility connection pipe 4c is connected to the boil-off gas main pipe 4a at a position upstream of the first on-off valve 4b. That is, the boil-off gas treatment facility connection pipe 4c connects the position upstream of the first on-off valve 4b of the boil-off gas main pipe 4a and the treatment facility 6. Such a boil-off gas treatment facility connection pipe 4c guides the boil-off gas G from the boil-off gas main pipe 4a to the treatment facility 6. The downstream end of the boil-off gas treatment facility connection pipe 4c is connected to a condenser 6a (described later) of the treatment facility 6.

[0024] The second on-off valve 4d is an on-off valve installed in the middle part of the boil-off gas treatment facility connection pipe 4c. The second on-off valve 4d is opened and closed under the control of the control unit 8. The boil-off gas G is supplied to the treatment facility 6 in a state where such a second on-off valve 4d is open. Also, when the second on-off valve 4d is closed, the supply of the boil-off gas G to the treatment facility 6 is stopped.

[0025] The boil-off gas compressor 4e is a compressor that boosts the pressure of the boil-off gas G flowing through the boil-off gas main pipe 4a, and is installed in the middle part of the boil-off gas main pipe 4a. The boil-off gas compressor 4e is arranged on the upstream side of the position where the boil-off gas treatment facility connection pipe 4c of the boil-off gas main pipe 4a is connected. The boil-off gas compressor 4e compresses and boosts the boil-off gas G to a pressure at which it can be supplied to the gas supply pipe 3d and the treatment facility 6.

[0026] In the event of an emergency, the emergency exhaust pipe 4f is a pipe for supplying boil-off gas G to the ground flare F (pollution control equipment) when the pressure of the boil-off gas G abnormally increases. The upstream end of the emergency exhaust pipe 4f is connected to the boil-off gas main pipe 4a, and the downstream end is connected to an open valve 6d for boil-off gas, which will be described later, of the processing facility 6. The upstream end of the emergency exhaust pipe 4f is connected to the boil-off gas main pipe 4a at a position upstream of the boil-off gas compressor 4e.

[0027] Also, in the present embodiment, the emergency exhaust pipe 4f functions as a pipe for guiding the nitrogen gas N recovered by the nitrogen gas recovery section 5 during normal times. The nitrogen gas recovery section 5 is connected to an intermediate portion of the emergency exhaust pipe 4f. During normal times (when the open valve 6d for boil-off gas is closed), the emergency exhaust pipe 4f allows the nitrogen gas N supplied from the nitrogen gas recovery section 5 to flow into the boil-off gas main pipe 4a. That is, the nitrogen gas N recovered by the nitrogen gas recovery section 5 flows through the emergency exhaust pipe 4f toward the boil-off gas main pipe 4a and is supplied to the boil-off gas main pipe 4a.

[0028] The nitrogen gas recovery section 5 supplies the nitrogen gas N recovered from nitrogen gas-using equipment to the boil-off gas supply section 4 and mixes it with the boil-off gas G. As shown in FIG. 1, the nitrogen gas recovery section 5 is composed of a pipe for guiding the nitrogen gas N from the nitrogen gas recovery section 5 to the boil-off gas main pipe 4a of the boil-off gas supply section 4. The upstream portion of the nitrogen gas recovery section 5 is branched into a plurality of parts. Each of the branched upstream ends is connected to a nitrogen gas-using equipment.

[0029] In this embodiment, the ammonia tank 2, the vaporization facility 3c, and the gas analyzer 7 are nitrogen gas-using devices. For example, the ammonia tank 2 uses nitrogen gas N as a purge gas. Also, the vaporization facility 3c uses nitrogen gas N as a purge gas or a seal gas. Further, the gas analyzer 7 takes in and analyzes the boil-off gas G containing nitrogen gas N and then exhausts it. That is, the nitrogen gas N used in the ammonia tank 2, the vaporization facility 3c, and the gas analyzer 7 is supplied to the main boil-off gas pipe 4a of the boil-off gas supply section 4 via the nitrogen gas recovery section 5.

[0030] The treatment facility 6 can separate nitrogen gas N from the boil-off gas G and supply it to the ground flare F. Also, when the pressure of the ammonia tank 2 abnormally rises, the treatment facility 6 receives the boil-off gas G via the emergency exhaust pipe 4f and can supply the boil-off gas G received from the emergency exhaust pipe 4f to the ground flare F. As shown in FIG. 1, such a treatment facility 6 includes a condenser 6a, a nitrogen gas discharge section 6b (discharge section), a boil-off gas receiving pipe 6c, and a boil-off gas open valve 6d.

[0031] When the boil-off gas G is supplied from the boil-off gas supply section 4, the condenser 6a condenses the boil-off gas G. When the second on-off valve 4d is opened, the boil-off gas G is supplied from the boil-off gas supply section 4 to the condenser 6a. The boil-off gas G is liquefied by being condensed inside the condenser 6a and becomes ammonia liquid X. When the boil-off gas G supplied to the condenser 6a contains nitrogen gas N, the nitrogen gas N in the boil-off gas G remains in the condenser 6a as a gas without being liquefied inside the condenser 6a.

[0032] The nitrogen gas discharge section 6b supplies the nitrogen gas N accumulated inside the condenser 6a to the ground flare F. The nitrogen gas discharge section 6b includes a nitrogen gas pipe 6b1 and a nitrogen gas open valve 6b2.

[0033] The nitrogen gas pipe 6b1 is a pipe connecting the condenser 6a and the ground flare F. The upstream end of the nitrogen gas pipe 6b1 is connected to the condenser 6a, and the downstream end of the nitrogen gas pipe 6b1 is connected to the ground flare F. Such a nitrogen gas pipe 6b1 guides the nitrogen gas N from the condenser 6a to the ground flare F.

[0034] The nitrogen gas release valve 6b2 is a release valve installed in the middle part of the nitrogen gas pipe 6b1. This nitrogen gas release valve 6b2 is opened when the internal pressure of the condenser 6a exceeds a predetermined threshold value. The internal pressure of the condenser 6a rises as the nitrogen gas N accumulates. When the internal pressure of the condenser 6a exceeds a predetermined threshold value and the nitrogen gas release valve 6b2 is opened, the nitrogen gas N inside the condenser 6a flows into the nitrogen gas pipe 6b1.

[0035] When the nitrogen gas release valve 6b2 is opened, a part of the boil-off gas G inside the condenser 6a rides on the flow of the nitrogen gas N and flows into the nitrogen gas pipe 6b1. The boil-off gas G flowing into the nitrogen gas pipe 6b1 is incinerated at the ground flare F and rendered harmless.

[0036] The ground flare F incinerates the boil-off gas G contained in the supplied nitrogen gas N. When the amount of the boil-off gas G contained in the supplied nitrogen gas N is small, the ground flare F injects a fossil fuel such as LPG and burns ammonia. That is, the ground flare F burns ammonia together with the fuel. The ground flare F is also supplied with the boil-off gas G received by the processing facility 6 via the emergency exhaust pipe 4f. The ground flare F also incinerates such boil-off gas G. Instead of the ground flare F, a flare facility such as a flare stack may be used.

[0037] The gas analyzer 7 is a gas calorific value detection unit that detects the gas calorific value of the ammonia gas Y sent from the ammonia gas delivery unit 3 to the boiler B. In the present embodiment, two gas analyzers 7, namely a first gas analyzer 7a (first gas calorific value detection unit) and a second gas analyzer 7b (second gas calorific value detection unit), are provided.

[0038] As shown in FIG. 1, the first gas analyzer 7a is provided at an intermediate portion of the gas supply pipe 3d of the ammonia gas delivery section 3. Further, the first gas analyzer 7a is arranged on the downstream side of the position where the boil-off gas main pipe 4a of the gas supply pipe 3d is connected. Such a first gas analyzer 7a detects the gas calorific value of the ammonia gas Y supplied from the gas supply pipe 3d to the boiler B. Further, the first gas analyzer 7a inputs the detected gas calorific value to the control unit 8.

[0039] As shown in FIG. 1, the second gas analyzer 7b is provided at an intermediate portion of the boil-off gas main pipe 4a of the boil-off gas supply section 4. Further, the second gas analyzer 7b is arranged on the upstream side of the position where the boil-off gas treatment facility connection pipe 4c of the boil-off gas main pipe 4a is connected. Such a second gas analyzer 7b detects the gas calorific value of the boil-off gas G flowing through the boil-off gas main pipe 4a. Note that the second gas analyzer 7b can also be omitted.

[0040] Such a second gas analyzer 7b obtains, for example, the flow rate information of the ammonia gas Y supplied from the ammonia gas delivery section 3 to the boiler B via the control unit 8. Based on the obtained flow rate information of the ammonia gas Y, the second gas analyzer 7b calculates the gas calorific value of the ammonia gas Y when the boil-off gas G flowing through the boil-off gas main pipe 4a is mixed into the ammonia gas Y. The second gas analyzer 7b inputs the gas calorific value of the ammonia gas Y calculated in this way to the control unit 8.

[0041] Note that the calculation of the gas calorific value of the ammonia gas Y may be performed by the control unit 8. In this case, the second gas analyzer 7b detects the gas calorific value of the boil-off gas G flowing through the boil-off gas main pipe 4a and inputs the detected gas calorific value to the control unit 8. In this way, the detection of the gas calorific value of the ammonia gas Y in the gas analyzer 7 is not limited to directly detecting the gas calorific value of the ammonia gas Y to be delivered, but includes detecting a value that can be used to calculate the gas calorific value of the ammonia gas Y delivered to the boiler B.

[0042] The control unit 8 is connected to each of the gas analyzers 7 (the first gas analyzer 7a and the second gas analyzer 7b), and can acquire the calorific value of the ammonia gas Y supplied to the boiler B. Further, the control unit 8 is connected to each of the first on-off valve 4b and the second on-off valve 4d, and can control the opening and closing of each of the first on-off valve 4b and the second on-off valve 4d.

[0043] When the calorific value of the ammonia gas Y sent to the boiler B is lower than a predetermined threshold value, such a control unit 8 causes the boil-off gas supply unit 4 to supply the boil-off gas G to the processing facility 6. Also, when the calorific value of the ammonia gas Y sent to the boiler B is higher than a predetermined threshold value, the control unit 8 causes the boil-off gas supply unit 4 to supply the boil-off gas G to the ammonia gas sending unit 3.

[0044] Specifically, when the calorific value of the ammonia gas Y sent to the boiler B is lower than a predetermined threshold value, the control unit 8 closes the first on-off valve 4b and opens the second on-off valve 4d. As a result, the boil-off gas G is supplied from the boil-off gas supply unit 4 to the processing facility 6.

[0045] Also, when the calorific value of the ammonia gas Y sent to the boiler B is higher than a predetermined threshold value, the control unit 8 opens the first on-off valve 4b and closes the second on-off valve 4d. As a result, the boil-off gas G is supplied from the boil-off gas supply unit 4 to the ammonia gas sending unit 3.

[0046] Subsequently, the operation of the ammonia receiving facility 1 of this embodiment will be described. As shown in FIG. 1, the ammonia liquid X stored in the ammonia tank 2 is discharged from the ammonia tank 2 by the discharge pump 3a and supplied to the vaporization facility 3c. The ammonia liquid X supplied to the vaporization facility 3c is vaporized to become ammonia gas Y. The ammonia gas Y discharged from the vaporization facility 3c is sent to the boiler B.

[0047] On the other hand, the boil-off gas G generated inside the ammonia tank 2 is pressurized by being compressed by the boil-off gas compressor 4e after being discharged from the ammonia tank 2. When the gas calorific value of the ammonia gas Y sent to the boiler B is higher than a predetermined threshold value, the pressurized boil-off gas G is supplied to the ammonia gas delivery section 3 and mixed with the ammonia gas Y. Further, when the gas calorific value of the ammonia gas Y sent to the boiler B is lower than the predetermined threshold value, the pressurized boil-off gas G is supplied to the processing facility 6.

[0048] The boil-off gas G supplied to the processing facility 6 is condensed by the condenser 6a to become ammonia liquid X. The ammonia liquid X generated by the condenser 6a is discharged from the condenser 6a and returned to the ammonia tank 2 via, for example, an economizer (not shown). On the other hand, the nitrogen gas N accumulated inside the condenser 6a is supplied to the ground flare F, and the contained ammonia is incinerated.

[0049] FIG. 2 is a flowchart for explaining an example of the control of the control unit 8. As shown in this figure, the control unit 8 acquires the gas calorific value of the ammonia gas Y sent to the boiler B based on the signals input from the first gas analyzer 7a and the second gas analyzer 7b (step S1).

[0050] Subsequently, the control unit 8 determines whether or not the gas calorific value of the ammonia gas Y acquired in step S1 exceeds a preset threshold value (step S2). The threshold value here is set based on the gas calorific value acceptable by the boiler B. When the gas calorific value does not exceed the preset threshold value, the control unit 8 closes the first on-off valve 4b and opens the second on-off valve 4d (step S3), and causes the boil-off gas supply unit 4 to supply the boil-off gas G to the processing facility 6. On the other hand, when the gas calorific value exceeds the preset threshold value, the control unit 8 opens the first on-off valve 4b and closes the second on-off valve 4d (step S4), and causes the boil-off gas supply unit 4 to supply the boil-off gas G to the ammonia gas delivery section 3. Note that after steps S3 and S4, the control unit 8 returns to step S1.

[0051] The ammonia receiving facility 1 of the present embodiment as described above includes an ammonia tank 2 and an ammonia gas sending unit 3. The ammonia tank 2 stores the ammonia liquid X. The ammonia gas sending unit 3 vaporizes the ammonia liquid X and sends it toward the boiler B. Further, the ammonia receiving facility 1 of the present embodiment includes a boil-off gas supply unit 4, a nitrogen gas recovery unit 5, a gas analyzer 7, a treatment facility 6, and a control unit 8. The boil-off gas supply unit 4 can supply the boil-off gas G generated in the ammonia tank 2 to the ammonia gas sending unit 3. The nitrogen gas recovery unit 5 supplies the nitrogen gas N recovered from the nitrogen gas using equipment to the boil-off gas supply unit 4 and mixes it with the boil-off gas G. The gas analyzer 7 detects the gas calorific value of the ammonia gas sent from the ammonia gas sending unit 3. The treatment facility 6 can separate the nitrogen gas N from the boil-off gas and supply it to the ground flare F. When the gas calorific value is lower than a predetermined threshold value, the control unit 8 causes the boil-off gas supply unit 4 to supply the boil-off gas G to the treatment facility 6.

[0052] According to the ammonia receiving facility 1 of the present embodiment, the nitrogen gas N recovered by the nitrogen gas recovery unit 5 is mixed with the boil-off gas G, further mixed with the ammonia gas Y, and sent to the boiler B. When the gas calorific value of the ammonia gas Y sent to the boiler B is higher than a predetermined threshold value, the boil-off gas G is supplied to the boiler B. On the other hand, when the gas calorific value of the ammonia gas Y sent to the boiler B is lower than a predetermined threshold value, the boil-off gas G is supplied to the treatment facility 6. When the boil-off gas G is supplied to the treatment facility 6, the nitrogen gas N is separated from the boil-off gas G and supplied to the ground flare F. Thus, the ammonia receiving facility 1 of the present embodiment supplies the nitrogen gas N to the ground flare F only when the gas calorific value of the ammonia gas Y sent to the boiler B is lower than a predetermined threshold value. Therefore, according to the ammonia receiving facility 1 of the present embodiment, in the ammonia receiving facility 1 that vaporizes the ammonia liquid X and supplies it to the boiler B, the supply amount of the nitrogen gas N recovered from the nitrogen gas using equipment to the ground flare F can be suppressed.

[0053] In addition, in the ammonia receiving facility 1 of the present embodiment, the boil-off gas supply unit 4 includes a boil-off gas main pipe 4a, a first on-off valve 4b, a boil-off gas treatment facility connection pipe 4c, and a second on-off valve 4d. The boil-off gas main pipe 4a is connected to the ammonia gas sending unit 3. The first on-off valve 4b is installed at an intermediate portion of the boil-off gas main pipe 4a. The boil-off gas treatment facility connection pipe 4c connects an upstream position of the first on-off valve 4b of the boil-off gas main pipe 4a and the treatment facility 6. The second on-off valve 4d is installed at an intermediate portion of the boil-off gas treatment facility connection pipe 4c. Further, when the gas calorific value is lower than the threshold value, the control unit 8 closes the first on-off valve 4b and opens the second on-off valve 4d. Further, when the gas calorific value is higher than the threshold value, the control unit 8 opens the first on-off valve 4b and closes the second on-off valve 4d.

[0054] In the ammonia receiving facility 1 of the present embodiment configured as described above, the control unit 8 can open and close the first on-off valve 4b and the second on-off valve 4d. Therefore, the ammonia receiving facility 1 of the present embodiment can automatically change the supply destination of the boil-off gas G.

[0055] The ammonia receiving facility 1 of the present embodiment further includes a first gas analyzer 7a and a second gas analyzer 7b. The first gas analyzer 7a detects the gas calorific value at a position downstream of the first on-off valve 4b. The second gas analyzer 7b is a gas analyzer that detects the gas calorific value at a position upstream of the connection position of the boil-off gas treatment facility connection pipe 4c.

[0056] In the ammonia receiving facility 1 of the present embodiment configured as described above, it is possible to determine that the gas calorific value of the ammonia gas Y has fallen below the threshold value using the first gas analyzer 7a. Further, it is possible to determine that the gas calorific value of the ammonia gas Y has exceeded the threshold value using the second gas analyzer 7b.

[0057] In addition, it is possible to determine that the gas calorific value of ammonia gas Y has fallen below the threshold value using the second gas analyzer 7b. Therefore, it is also possible to omit the first gas analyzer 7a. However, by installing the first gas analyzer 7a, the gas calorific value can be detected immediately before the boiler B, so that the gas calorific value of the ammonia gas Y supplied to the boiler B can be measured more accurately.

[0058] Further, in the ammonia receiving facility 1 of the present embodiment, the processing facility 6 includes a condenser 6a and a nitrogen gas discharge section 6b. The condenser 6a condenses the boil-off gas G. The nitrogen gas discharge section 6b supplies the nitrogen gas N accumulated inside the condenser 6a to the ground flare F that detoxifies ammonia.

[0059] According to the ammonia receiving facility 1 of the present embodiment configured as described above, the nitrogen gas N can be separated from the boil-off gas G by condensing the boil-off gas G in the condenser 6a. Therefore, the ammonia receiving facility 1 of the present embodiment can separate and process the nitrogen gas N from the boil-off gas G with a simple configuration.

[0060] Further, in the ammonia receiving facility 1 of the present embodiment, the detoxification facility is a ground flare F that burns ammonia together with fuel. Since the ammonia receiving facility 1 of the present embodiment can suppress the supply amount of the nitrogen gas N recovered from the nitrogen gas using equipment to the ground flare F, the fossil fuel consumed by the ground flare F can be reduced.

[0061] Further, in the ammonia receiving facility 1 of the present embodiment, the ammonia tank 2, the ammonia gas delivery section 3, and the gas analyzer 7 are nitrogen gas using equipment. Therefore, the ammonia receiving facility 1 of the present embodiment can appropriately process the nitrogen gas N discharged from the ammonia tank 2, the ammonia gas delivery section 3, and the gas analyzer 7.

[0062] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 3. In the description of this embodiment, the same parts as those in the first embodiment will be omitted or simplified in the description.

[0063] FIG. 3 is a flowchart showing a schematic configuration of the ammonia receiving facility 1A of this embodiment. As shown in this figure, the ammonia receiving facility 1A of this embodiment includes a loading arm 10 and a return gas blower 11.

[0064] The loading arm 10 is a facility for transferring the ammonia liquid X and the boil-off gas G between the ammonia ship that transports the ammonia liquid X and the ammonia receiving facility 1A of this embodiment. The loading arm 10 receives the ammonia liquid X from the ammonia ship and supplies the ammonia liquid X to the ammonia tank 2 through a pipe. Further, the loading arm 10 supplies the boil-off gas G pumped by the return gas blower 11 to the ammonia ship. The return gas blower 11 is connected to the boil-off gas main pipe 4a of the boil-off gas supply section 4, and supplies the boil-off gas G supplied from the boil-off gas main pipe 4a to the loading arm 10.

[0065] These loading arm 10 and return gas blower 11 are nitrogen gas using devices that use nitrogen gas N as a purge gas or a seal gas. The nitrogen gas N used in these loading arm 10 and return gas blower 11 may contain ammonia. For this reason, in the ammonia receiving facility 1A of this embodiment, the nitrogen gas recovery section 5 also recovers the nitrogen gas N from the loading arm 10 and the return gas blower 11.

[0066] According to the ammonia receiving facility 1A of such an embodiment, it is possible to recover the nitrogen gas N from the loading arm 10 and the return gas blower 11 and appropriately process the recovered nitrogen gas N.

[0067] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. Needless to say, the present invention is not limited to the above embodiments. The various shapes, combinations, etc. of the respective constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

[0068] In addition, the above embodiments can also be described as follows, for example, in the following appended notes.

[0069] (Appended Note 1) An ammonia receiving facility comprising an ammonia tank for storing ammonia liquid and an ammonia gas sending unit for vaporizing the ammonia liquid and sending it out toward a supply destination, a boil-off gas supply unit capable of supplying the boil-off gas generated in the ammonia tank to the ammonia gas sending unit, a nitrogen gas recovery unit for supplying the nitrogen gas recovered from nitrogen gas using equipment to the boil-off gas supply unit and mixing it with the boil-off gas, a gas calorific value detection unit for detecting the gas calorific value of the ammonia gas sent out from the ammonia gas sending unit, a treatment facility capable of separating and treating the nitrogen gas from the boil-off gas and supplying it to a decontamination facility, and a control unit for causing the boil-off gas supply unit to supply the boil-off gas to the treatment facility when the gas calorific value is lower than a predetermined threshold value. An ammonia receiving facility characterized by comprising the above.

[0070] (Appended Note 2) The boil-off gas supply unit comprises a first pipe connected to the ammonia gas sending unit, a first on-off valve installed at an intermediate portion of the first pipe, a second pipe connecting an upstream position of the first pipe from the first on-off valve and the treatment facility, and a second on-off valve installed at an intermediate portion of the second pipe. The control unit comprises When the gas calorific value is lower than the threshold value, the first on-off valve is closed and the second on-off valve is opened, When the gas calorific value is higher than the threshold value, the first on-off valve is opened and the second on-off valve is closed The ammonia receiving facility according to appended note 1, characterized by the above.

[0071] (Appended note 3) A first gas calorific value detection unit which is the gas calorific value detection unit that detects the gas calorific value at a position downstream of the first on-off valve, A second gas calorific value detection unit which is the gas calorific value detection unit that detects the gas calorific value at a position upstream of the connection position of the second pipe The ammonia receiving facility according to appended note 2, characterized by comprising the above.

[0072] (Appended note 4) The processing facility is A condenser that condenses the boil-off gas, An exhaust unit that supplies the nitrogen gas accumulated inside the condenser to the decontamination facility that decontaminates the ammonia The ammonia receiving facility according to any one of appended notes 1 to 3, characterized by comprising the above.

[0073] (Appended note 5) The ammonia receiving facility according to appended note 4, characterized in that the decontamination facility is a flare facility that burns ammonia together with fuel.

[0074] (Appended note 6) The ammonia receiving facility according to any one of appended notes 1 to 5, characterized in that at least any one of the ammonia tank, the ammonia gas delivery unit, and the gas calorific value detection unit is the nitrogen gas using equipment.

Explanation of reference signs

[0075] 1... Ammonia receiving facility, 1A... Ammonia receiving facility, 2... Ammonia tank, 3... Ammonia gas delivery section, 3a... Discharge pump, 3b... Discharge pipe, 3c... Vaporization facility, 3d... Gas supply pipe, 4... Boil-off gas supply section, 4a... Boil-off gas main pipe (first pipe), 4b... First on-off valve, 4c... Boil-off gas treatment facility connection pipe (second pipe), 4d... Second on-off valve, 4e... Boil-off gas compressor, 4f... Emergency exhaust pipe, 5... Nitrogen gas recovery section, 6... Treatment facility, 6a... Condenser, 6b... Nitrogen gas discharge section, 6b1... Nitrogen gas pipe, 6b2... Nitrogen gas release valve, 6c... Boil-off gas receiving pipe, 6d... Boil-off gas release valve, 7... Gas analyzer (gas calorific value detection section), 7a... First gas analyzer (first gas calorific value detection section), 7b... Second gas analyzer (second gas calorific value detection section), 8... Control section, 10... Loading arm, 11... Return gas blower, B... Boiler (supply destination), F... Grand flare (decontamination facility, flare facility), G... Boil-off gas, N... Nitrogen gas, X... Ammonia liquid, Y... Ammonia gas

Claims

1. An ammonia receiving facility comprising an ammonia tank for storing ammonia liquid and an ammonia gas delivery unit for vaporizing the ammonia liquid and delivering it to a supply destination, a boil-off gas supply unit capable of supplying the boil-off gas generated in the ammonia tank to the ammonia gas delivery unit; a nitrogen gas recovery unit that supplies nitrogen gas recovered from a nitrogen gas-using device to the boil-off gas supply unit and mixes it with the boil-off gas; a gas calorific value detector for detecting a gas calorific value contained in the ammonia gas delivered from the ammonia gas delivery unit; a treatment facility capable of separating and treating the nitrogen gas from the boil-off gas and supplying the nitrogen gas to a detoxification facility; a control unit that causes the boil-off gas supply unit to supply the boil-off gas to the treatment facility when the gas calorific value is lower than a predetermined threshold value; An ammonia receiving facility comprising:

2. The boil-off gas supply unit is a first pipe connected to the ammonia gas delivery unit; a first on-off valve installed in a middle portion of the first pipe; a second pipe connecting a position upstream of the first on-off valve of the first pipe to the treatment facility; a second on-off valve installed in a middle portion of the second pipe; Equipped with The control unit When the gas calorific value is lower than the threshold value, the first on-off valve is closed and the second on-off valve is opened; When the gas calorific value is higher than the threshold value, the first on-off valve is opened and the second on-off valve is closed.

2. The ammonia receiving facility according to claim 1.

3. a first gas calorie detection unit that is the gas calorie detection unit that detects the gas calorie at a position downstream of the first on-off valve; a second gas calorie detector that detects the gas calorie at a position upstream of the connection position of the second pipe; 3. The ammonia receiving facility according to claim 2, further comprising:

4. The processing equipment comprises: a condenser for condensing the boil-off gas; an exhaust section that supplies the nitrogen gas accumulated inside the condenser to a detoxification facility that detoxifies ammonia; The ammonia receiving facility according to any one of claims 1 to 3, comprising:

5. 5. The ammonia receiving facility according to claim 4, wherein the abatement facility is a flare facility that burns ammonia together with fuel.

6. The ammonia receiving facility according to any one of claims 1 to 3, characterized in that at least one of the ammonia tank, the ammonia gas delivery unit, and the gas calorific value detection unit is the nitrogen gas-using equipment.

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