Ammonia reception facility

Abstract

To suppress use of fossil fuel in a flare stack in an ammonia reception facility in which the flare stack performs combustion treatment of surplus gas.SOLUTION: An ammonia reception facility 1 that vaporizes and delivers ammonia liquid X to a boiler B as ammonia gas Y includes: a hydrogen gas generation section 7 that generates hydrogen gas H through cracking of part of the ammonia gas Y to be delivered to the boiler B; and a hydrogen gas supply section 8 that supplies the hydrogen gas H generated in the hydrogen gas generation section 7 to a flare stack F.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 flare stack. The flare stack disclosed in Patent Document 1 is provided with an ignition torch at the upper part. The ignition torch forms a flame by burning fuel supplied from the outside. The gas to be treated is subjected to combustion treatment by being supplied to the flame formed by the ignition torch.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Receiving equipment for vaporizing LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas) and supplying it to a boiler or the like is provided with a flare stack as disclosed in Patent Document 1. Such receiving equipment burns the surplus gas generated in the receiving equipment by the flare stack. Even in receiving equipment that handles ammonia instead of LNG or LPG, the surplus ammonia gas is burned by the flare stack. However, ammonia gas is more difficult to burn compared to fossil fuels. For this reason, in the flare stack, it is necessary to use fossil fuels as assist gas for assisting the combustion of ammonia gas or as fuel for a pilot burner such as the ignition torch of the flare stack in Patent Document 1. However, in order to meet the social demand for decarbonization, it is preferable to suppress the use of fossil fuels in the flare stack.

[0005] The present invention has been made in view of the above-described problems, and an object thereof is to enable suppression of the use of fossil fuels in a flare stack in an ammonia receiving facility that burns surplus gas in the flare stack.

Means for Solving the Problems

[0006] As 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 that vaporizes ammonia liquid and sends it as ammonia gas to a supply destination, the hydrogen gas generation unit that cracks a part of the ammonia gas sent to the supply destination to generate hydrogen gas, and the hydrogen gas supply unit that supplies the hydrogen gas generated by the hydrogen gas generation unit to the flare stack.

Effects of the Invention

[0008] According to the present invention, hydrogen gas can be generated by cracking ammonia gas, and the generated hydrogen gas can be supplied to the flare stack. That is, according to the present invention, by supplying hydrogen gas to the flare stack instead of fossil fuel, combustion in the flare stack can be maintained. Therefore, the present invention can reduce or eliminate the use of fossil fuels in the flare stack. Such a present invention can suppress the use of fossil fuels in a flare stack in an ammonia receiving facility that burns surplus gas in the flare stack.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, an embodiment of the 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 is not limited to the boiler B.

[0012] As shown in FIG. 1, the ammonia receiving facility 1 of the present embodiment includes an ammonia tank 2, an ammonia gas delivery section 3, a boil-off gas supply section 4, a boil-off gas recovery facility 5, an excess gas discharge section 6, a hydrogen gas generation section 7, and a hydrogen gas supply section 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 section 3 vaporizes the ammonia liquid X and delivers it toward the boiler B. As shown in FIG. 1, the ammonia gas delivery section 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 outwardly of the ammonia tank 2. The discharge pump 3a is connected to, for example, a control unit (not shown) and discharges a specified amount of the ammonia liquid X outwardly of the ammonia tank 2 based on the control of the control unit.

[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 heat-exchanging the ammonia liquid X with a heating fluid such as seawater.

[0018] The gas supply pipe 3d is a pipe connecting the vaporization facility 3c and the boiler B. The upstream end of the gas supply pipe 3d is connected to the vaporization facility 3c, and the downstream end of the gas supply pipe 3d is connected to the boiler B. Note that the downstream end of the gas supply pipe 3d does not necessarily have to be directly connected to the boiler B. That is, the downstream end of the gas supply pipe 3d may be connected to the boiler B via other equipment or the like. The gas supply 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 main boil-off gas pipe 4a, a first on-off valve 4b, a boil-off gas treatment facility connection pipe 4c, a second on-off valve 4d, and a boil-off gas compressor 4e.

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

[0022] The first on-off valve 4b is an on-off valve installed at an intermediate portion of the main boil-off gas pipe 4a. The first on-off valve 4b is opened and closed under the control of a control unit (not shown), for example. The first on-off valve 4b is located at an intermediate portion of the main boil-off gas pipe 4a, near the downstream end of the main boil-off gas 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 main boil-off gas pipe 4a is connected. The boil-off gas G is supplied to the gas delivery pipe 3d in a state where such a first on-off valve 4b is open. Also, when the first on-off valve 4b is closed, the supply of the boil-off gas G to the gas delivery 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 boil-off gas recovery facility 5. 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 boil-off gas recovery facility 5. 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 boil-off gas recovery facility 5. 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 boil-off gas recovery facility 5. The downstream end of the boil-off gas treatment facility connection pipe 4c is connected to a condenser 5a (described later) of the boil-off gas recovery facility 5.

[0024] The second on-off valve 4d is an on-off valve installed in the middle of the boil-off gas treatment facility connection pipe 4c. The second on-off valve 4d is opened and closed under the control of a control unit (not shown), for example. The boil-off gas G is supplied to the boil-off gas recovery facility 5 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 boil-off gas recovery facility 5 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 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 boil-off gas recovery facility 5.

[0026] The boil-off gas recovery facility 5 can reliquefy the boil-off gas G. As shown in FIG. 1, such a boil-off gas recovery facility 5 includes a condenser 5a. When the boil-off gas G is supplied from the boil-off gas supply section 4, the condenser 5a 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 5a. The boil-off gas G is liquefied by being condensed inside the condenser 5a and becomes ammonia liquid X.

[0027] The surplus gas discharge section 6 discharges the surplus boil-off gas G from the ammonia tank 2. As shown in FIG. 1, the surplus gas discharge section 6 includes a discharge pipe 6a and a relief valve 6b. The discharge pipe 6a is a pipe connecting the ammonia tank 2 and the flare stack F. The upstream end of the discharge pipe 6a is connected to the ammonia tank 2, and the downstream end of the discharge pipe 6a is connected to the flare stack F.

[0028] The relief valve 6b is provided at an intermediate portion of the discharge pipe 6a and is opened when the internal pressure of the ammonia tank 2 exceeds a predetermined pressure. When the relief valve 6b is opened, a part of the boil-off gas G inside the ammonia tank 2 is discharged as surplus gas Z (gas to be detoxified) through the discharge pipe 6a. As shown in FIG. 1, a bypass line for allowing the boil-off gas G to escape into the discharge pipe 6a may be provided before the relief valve 6b operates.

[0029] The hydrogen gas generation section 7 cracks a part of the ammonia gas Y sent to the boiler B to generate hydrogen gas H. As shown in FIG. 1, the hydrogen gas generation section 7 includes a supply pipe 7a, a pressure reducing valve 7b (ammonia gas pressure adjustment section), a catalyst 7c, a discharge pipe 7d, a mixed gas compressor 7e, and a separation device 7f.

[0030] The supply pipe 7a is a pipe that connects the boil-off gas main pipe 4a of the boil-off gas supply section 4 and the catalyst 7c. The upstream end of the supply pipe 7a is connected to the boil-off gas main pipe 4a, and the downstream end is connected to the catalyst 7c. Such a supply pipe 7a supplies ammonia gas Y to the catalyst 7c.

[0031] The pressure reducing valve 7b is provided at an intermediate portion of the supply pipe 7a. The pressure reducing valve 7b reduces the pressure of the ammonia gas Y flowing through the supply pipe 7a. This pressure reducing valve 7b reduces the pressure of the ammonia gas Y to a pressure at which the ammonia gas Y can be preferably decomposed by the catalyst 7c. That is, the pressure reducing valve 7b is an ammonia gas pressure adjusting unit that adjusts the pressure of the ammonia gas Y supplied to the catalyst 7c to a pressure suitable for decomposition. However, when it is not necessary to adjust the pressure of the ammonia gas Y supplied to the supply pipe 7a, the pressure reducing valve 7b can be omitted.

[0032] The catalyst 7c is disposed inside the furnace of the boiler B which is a heat source. The catalyst 7c is heated by the heat (radiation or convection) from the boiler B. For example, the catalyst 7c decomposes ammonia gas Y into hydrogen gas H and nitrogen gas N in such a heated state. However, the gas generated by the catalyst 7c is a mixed gas K in which hydrogen gas H and nitrogen gas N are mixed. That is, such a mixed gas K is a hydrogen-containing gas containing hydrogen gas H.

[0033] As such a catalyst 7c, for example, one formed of a non-metallic material and capable of decomposing almost 100% of ammonia gas Y into hydrogen gas H and nitrogen gas N at 600°C or higher and a pressure of 0.1 to 0.6 MPa can be used. However, the material forming the catalyst 7c is not particularly limited as long as it can decompose ammonia gas Y in a heated state.

[0034] The discharge pipe 7d is a pipe for discharging the mixed gas K generated by the catalyst 7c from the catalyst 7c. The upstream end of the discharge pipe 7d is connected to the catalyst 7c, and the downstream end is connected to the mixed gas compressor 7e. Such a discharge pipe 7d guides the mixed gas K from the catalyst 7c to the mixed gas compressor 7e.

[0035] The mixed gas compressor 7e compresses the mixed gas K supplied from the discharge pipe 7d. The mixed gas compressor 7e boosts the pressure of the mixed gas K to a pressure suitable for the separation device 7f. Note that when the pressure of the mixed gas K in the discharge pipe 7d is a pressure suitable for the separation device 7f, the mixed gas compressor 7e may be omitted.

[0036] The separation device 7f separates the hydrogen gas H from the mixed gas K supplied from the mixed gas compressor 7e. For example, the separation device 7f can use, for example, a pressure swing adsorption (PSA) type device. Note that the mixed gas K (mainly nitrogen gas N) after the hydrogen gas H is separated is discharged from the separation device 7f and, after being treated as necessary, is, for example, released to the atmosphere.

[0037] The hydrogen gas supply unit 8 supplies the hydrogen gas H generated in the hydrogen gas generation unit 7 to the flare stack F. As shown in FIG. 1, the hydrogen gas supply unit 8 includes a pilot burner connection pipe 8a and an assist fuel pipe 8b.

[0038] The pilot burner connection pipe 8a is connected to the pilot burner F1 of the flare stack F. The pilot burner F1 of the flare stack F keeps the flame using the hydrogen gas H supplied from the hydrogen gas supply unit 8 as fuel.

[0039] The assist fuel pipe 8b is a pipe for mixing the hydrogen gas H as assist fuel with the excess gas Z supplied from the discharge pipe 6a to the flare stack F. When combustion is difficult only with the excess gas Z supplied from the discharge pipe 6a to the flare stack F, the hydrogen gas H is supplied to the flare stack F via the assist fuel pipe 8b.

[0040] However, if combustion is possible using only the surplus gas Z, it is not necessary to supply hydrogen gas H from the assist fuel pipe 8b to the flare stack F. For example, a flow rate control valve (not shown) may be provided in the middle of the assist fuel pipe 8b, and the flow rate of hydrogen gas H supplied from the assist fuel pipe 8b to the flare stack F can be adjusted.

[0041] The flare stack F incinerates the boil-off gas G supplied from the excess gas discharge unit 6. The flare stack F also uses hydrogen gas H supplied from the pilot burner connection pipe 8a of the hydrogen gas generation unit 7 as fuel for the pilot burner F1. The flare stack F can also mix hydrogen gas H supplied from the assist fuel pipe 8b of the hydrogen gas generation unit 7 as assist fuel with the boil-off gas G.

[0042] As shown in Fig. 1, the pilot burner F1 is disposed at the top of the flare stack F. The pilot burner F1 is connected to a pilot burner connection pipe 8a of the hydrogen gas generator 7. The flare stack F is also connected at its bottom to a discharge pipe 6a and an assist fuel pipe 8b.

[0043] Next, 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.

[0044] On the other hand, the boil-off gas G generated inside the ammonia tank 2 is compressed by the boil-off gas compressor 4e after being discharged from the ammonia tank 2. The pressurized boil-off gas G is supplied to the ammonia gas delivery unit 3 and mixed with the ammonia gas Y.

[0045] For example, when the demand for ammonia in the boiler B is low, the pressurized boil-off gas G is supplied to the boil-off gas recovery facility 5. The boil-off gas G supplied to the boil-off gas recovery facility 5 is condensed in the condenser 5a to become the ammonia liquid X. The ammonia liquid X produced in the condenser 5a is discharged from the condenser 5a and returned to the ammonia tank 2 via, for example, an economizer (not shown).

[0046] The surplus gas Z discharged from the ammonia tank 2 by the surplus gas discharge unit 6 is supplied to the flare stack F via the discharge pipe 6a. As shown in FIG. 1, the surplus gas Z is supplied to the lower part of the flare stack F and mixed with the hydrogen gas H inside the flare stack F as needed.

[0047] In this embodiment, a portion of the ammonia gas Y supplied to the boiler B flows into the supply pipe 7a of the hydrogen gas generator 7. The ammonia gas Y that has flowed into the supply pipe 7a is reduced in pressure by the pressure reducing valve 7b and then supplied to the catalyst 7c. The catalyst 7c is disposed inside the boiler B and is heated using the boiler B as a heat source. Therefore, the ammonia gas Y supplied to the catalyst 7c is cracked by the catalyst 7c in a heated state.

[0048] By cracking the ammonia gas Y in this manner, a mixed gas K containing hydrogen gas H and nitrogen gas N is generated. The mixed gas K is supplied from the catalyst 7c via an exhaust pipe 7d to a mixed gas compressor 7e and pressurized. The pressurized mixed gas K is supplied to a separator 7f. In the separator 7f, hydrogen gas H is separated from the mixed gas K. The hydrogen gas H separated from the mixed gas K is supplied to a flare stack F by a hydrogen gas supply unit 8.

[0049] Hydrogen gas H supplied to the pilot burner F1 of the flare stack F via the pilot burner connection pipe 8a of the hydrogen gas supply unit 8 is used as fuel in the pilot burner F1. In addition, hydrogen gas H supplied to the flare stack F via the assist fuel pipe 8b of the hydrogen gas supply unit 8 is mixed with the surplus gas Z as assist fuel. The surplus gas Z and hydrogen gas H are ignited and combusted by the flame formed by the pilot burner F1.

[0050] The ammonia receiving equipment 1 of this embodiment as described above vaporizes ammonia liquid X and delivers it to the boiler B as ammonia gas Y. The ammonia receiving equipment 1 also includes a hydrogen gas generator 7 and a hydrogen gas supply unit 8. The hydrogen gas generator 7 cracks a portion of the ammonia gas Y delivered to the boiler B to produce hydrogen gas H. The hydrogen gas supply unit 8 supplies the hydrogen gas H produced in the hydrogen gas generator 7 to the flare stack F.

[0051] According to the ammonia receiving facility 1 of this embodiment, hydrogen gas H can be generated by cracking ammonia gas Y, and the generated hydrogen gas H can be supplied to the flare stack F. That is, according to the ammonia receiving facility 1 of this embodiment, combustion in the flare stack F can be maintained by supplying hydrogen gas H to the flare stack F in place of fossil fuel. Therefore, the ammonia receiving facility 1 of this embodiment can reduce or eliminate the use of fossil fuel in the flare stack F. The ammonia receiving facility 1 of this embodiment can suppress the use of fossil fuel in the flare stack F in an ammonia receiving facility that causes the flare stack F to combustibly treat surplus gas Z.

[0052] Furthermore, in the ammonia receiving equipment 1 of this embodiment, the hydrogen gas generation unit 7 includes a catalyst 7c, a supply pipe 7a, and a discharge pipe 7d. The catalyst 7c is heated by heat from the boiler B and cracks the ammonia gas Y. The supply pipe 7a supplies the ammonia gas Y to the catalyst 7c. The discharge pipe 7d discharges the mixed gas K containing the hydrogen gas H from the catalyst 7c.

[0053] According to the ammonia receiving equipment 1 of the present embodiment, the catalyst 7c is used to generate the mixed gas K containing the hydrogen gas H. Therefore, the hydrogen gas H can be obtained without using energy such as electric power.

[0054] In this embodiment, the heat source for heating the catalyst 7c is the boiler B that burns the ammonia gas Y. The catalyst 7c is disposed inside the boiler B and is heated using the boiler B as a heat source.

[0055] According to the ammonia receiving equipment 1 of this embodiment, there is no need to use a separate heat source that is used only for heating the catalyst 7c, and therefore the ammonia receiving equipment 1 can be simplified and made smaller.

[0056] Furthermore, in the ammonia receiving facility 1 of this embodiment, the hydrogen gas generating unit 7 includes a separator 7f that separates hydrogen gas H from the mixed gas K. According to the ammonia receiving facility 1 of this embodiment, it is possible to supply highly pure hydrogen gas H to the flare stack F. Furthermore, for example, if the amount of hydrogen gas H produced exceeds the amount required for the flare stack F, the highly pure hydrogen gas H can be extracted from the ammonia receiving facility 1 and used for another purpose.

[0057] Furthermore, in the ammonia receiving equipment 1 of this embodiment, the hydrogen gas generating unit 7 is provided with a pressure reducing valve 7b that adjusts the pressure of the ammonia gas Y supplied to the catalyst 7c. According to the ammonia receiving equipment 1 of this embodiment, it is possible to adjust the pressure of the surplus gas Z supplied to the catalyst 7c to a pressure suitable for cracking.

[0058] Further, in the present embodiment, the flare stack F is provided with a pilot burner F1. The hydrogen gas supply unit 8 includes a pilot burner connection pipe 8a and an assist fuel pipe 8b. The pilot burner connection pipe 8a can supply hydrogen gas H to the pilot burner F1. The assist fuel pipe 8b can mix hydrogen gas H with the surplus gas Z supplied to the flare stack F.

[0059] According to such an ammonia receiving facility 1 of the present embodiment, the hydrogen gas H generated by the hydrogen gas generation unit 7 can be used as both fuel for the pilot burner F1 and assist fuel mixed with the surplus gas Z.

[0060] (Second Embodiment) Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those in the first embodiment will be omitted or simplified.

[0061] FIG. 2 is a flowchart showing a schematic configuration of the ammonia receiving facility 1A of the present embodiment. As shown in this figure, in the ammonia receiving facility 1A of the present embodiment, the hydrogen gas generation unit 7 does not include a mixed gas compressor 7e and a separation device 7f.

[0062] According to such an ammonia receiving facility 1A of the present embodiment, a mixed gas K containing hydrogen gas H is supplied to the flare stack F. The mixed gas K mainly consists of hydrogen gas H and nitrogen gas N. Therefore, when nitrogen gas N can be stably burned with the surplus gas Z even if it is supplied to the flare stack F, it is not necessary to separate hydrogen gas H from the mixed gas K.

[0063] According to such an ammonia receiving facility 1A of the present embodiment, since it does not include a mixed gas compressor 7e and a separation device 7f, the hydrogen gas generation unit 7 can be simplified and miniaturized.

[0064] (Third Embodiment) Next, a third embodiment of the present invention will be described. In the description of this embodiment, the parts similar to those in the second embodiment will be omitted or simplified in the description.

[0065] FIG. 3 is a flowchart showing a schematic configuration of the ammonia receiving facility 1B of this embodiment. As shown in this figure, in the ammonia receiving facility 1B of this embodiment, the hydrogen gas generation unit 7 does not include a pressure reducing valve 7b.

[0066] For example, when the pressure of the ammonia gas Y is suitable for the cracking of the ammonia gas Y by the catalyst 7c, there is no need to provide the pressure reducing valve 7b. Even in such an ammonia receiving facility 1B of this embodiment, hydrogen gas H can be generated by cracking the ammonia gas Y, and the generated hydrogen gas H can be supplied to the flare stack F. Therefore, the ammonia receiving facility 1B of this embodiment can suppress the use of fossil fuels in the flare stack F in the ammonia receiving facility for burning the surplus gas Z in the flare stack F.

[0067] As described above, the preferred embodiments of the present invention have been described 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 constituent members shown in the above 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] Note that the above embodiment can also be described as follows, for example, in the following supplementary note.

[0069] (Supplementary Note 1) An ammonia receiving facility that vaporizes ammonia liquid and sends it as ammonia gas to a supply destination, a hydrogen gas generation unit that cracks a part of the ammonia gas sent to the supply destination to generate hydrogen gas, and a hydrogen gas supply unit that supplies the hydrogen gas generated by the hydrogen gas generation unit to a flare stack An ammonia receiving facility characterized by comprising.

[0070] (Appendix 2) The hydrogen gas generation unit is heated by heat from a heat source and includes a catalyst for cracking the ammonia gas, a supply pipe for supplying the ammonia gas to the catalyst, and a discharge pipe for discharging a hydrogen-containing gas containing the hydrogen gas from the catalyst The ammonia receiving facility according to Appendix 1, characterized by comprising the above.

[0071] (Appendix 3) The supply destination is a boiler that burns the ammonia gas, The catalyst is disposed inside the furnace of the boiler and is heated using the boiler as the heat source The ammonia receiving facility according to Appendix 2, characterized by the above.

[0072] (Appendix 4) The hydrogen gas generation unit is provided with a separation device for separating hydrogen gas from the hydrogen-containing gas, and is the ammonia receiving facility according to Appendix 2 or 3, characterized by the above.

[0073] (Appendix 5) The hydrogen gas generation unit is provided with an ammonia gas pressure adjustment unit for adjusting the pressure of the ammonia gas supplied to the catalyst, and is the ammonia receiving facility according to any one of Appendices 1 to 4, characterized by the above.

[0074] (Appendix 6) The flare stack is provided with a pilot burner, The hydrogen gas supply unit includes a pilot burner connection pipe capable of supplying the hydrogen gas to the pilot burner, and an assist fuel pipe capable of mixing the hydrogen gas with a gas to be detoxified supplied to the flare stack and is provided with The ammonia receiving facility according to any one of Appendices 1 to 5, characterized by the above.

Explanation of Signs

[0075] 1...Ammonia receiving equipment, 1A...Ammonia receiving equipment, 1B...Ammonia receiving equipment, 2...Ammonia tank, 3...Ammonia gas delivery section, 4...Boil-off gas supply section, 5...Boil-off gas recovery equipment, 6...Excess gas discharge section, 6a...Discharge piping, 6b...Relief valve, 7...Hydrogen gas generation section, 7a...Supply piping, 7b...Pressure reducing valve (ammonia gas pressure adjustment section), 7c...Catalyst, 7d...Discharge piping, 7e...Mixed gas compressor, 7f...Separator, 8...Hydrogen gas supply section, 8a...Pilot burner connection piping, 8b...Assist fuel piping, B...Boiler (supply destination, heat source), F...Flare stack, F1...Pilot burner, G...Boil-off gas, H...Hydrogen gas, K...Mixed gas (hydrogen-containing gas), N...Nitrogen gas, X...Ammonia liquid, Y...Ammonia gas, Z...Excess gas (gas to be abatement)

Claims

1. An ammonia receiving facility that vaporizes ammonia solution and sends it as ammonia gas to a supply destination, a hydrogen gas generation unit that cracks a part of the ammonia gas sent to the supply destination to generate hydrogen gas, and a hydrogen gas supply unit that supplies the hydrogen gas generated by the hydrogen gas generation unit to a flare stack An ammonia receiving facility characterized by comprising.

2. The hydrogen gas generation unit, a catalyst that is heated by heat from a heat source and cracks the ammonia gas, a supply pipe that supplies the ammonia gas to the catalyst, and a discharge pipe that discharges a hydrogen-containing gas containing the hydrogen gas from the catalyst The ammonia receiving facility according to claim 1, characterized by comprising.

3. The supply destination is a boiler that burns the ammonia gas, The catalyst is disposed inside the furnace of the boiler and is heated using the boiler as the heat source The ammonia receiving facility according to claim 2, characterized by this.

4. The hydrogen gas generation unit is provided with a separation device that separates hydrogen gas from the hydrogen-containing gas, according to claim 2 or 3. The ammonia receiving facility described.

5. The hydrogen gas generation unit is provided with an ammonia gas pressure adjustment unit that adjusts the pressure of the ammonia gas supplied to the catalyst, according to claim 2 or 3. The ammonia receiving facility described.

6. The flare stack is provided with a pilot burner, The hydrogen gas supply unit, a pilot burner connection pipe capable of supplying the hydrogen gas to the pilot burner, and an assist fuel pipe capable of mixing the hydrogen gas with the gas to be detoxified supplied to the flare stack Comprising The ammonia receiving facility according to any one of claims 1 to 3, characterized by this.

Images