Ammonia receiving facility

Abstract

To prevent ammonia gas from being released to the atmosphere even when an outer tank pressure of an ammonia tank for storing ammonia liquid rises to a pressure at which release of the ammonia gas is required.SOLUTION: An ammonia receiving facility 1 comprises an ammonia tank 2 that stores ammonia liquid X. The ammonia receiving facility comprises a gas release unit 5 that opens when an outer tank pressure of the ammonia tank 2 exceeds a predetermined release pressure, and an ammonia absorption liquid contact unit 6 that can contact ammonia absorption liquid Y capable of absorbing ammonia and release gas G released from the gas release unit 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an ammonia receiving facility. [Background technology]

[0002] For example, Patent Document 1 discloses a liquefied gas storage tank. The liquefied gas storage tank disclosed in Patent Document 1 is a double-shell tank having a storage container and an outer shell surrounding the storage container. In the liquefied gas storage tank disclosed in Patent Document 1, a heat insulating layer is provided in the space between the storage container and the outer shell. Furthermore, this space is filled with dry gas. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-17920 Summary of the Invention [Problem to be solved by the invention]

[0004] In a double-shell tank having an inner tank (e.g., the storage container of Patent Document 1) and an outer tank (e.g., the outer shell of Patent Document 1), if liquefied gas leaks from the inner tank for some reason, the liquefied gas leaking from the inner tank will vaporize in the space between the inner and outer tanks. As a result, the internal pressure of the outer tank will increase. If the liquefied gas is LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas), the vaporized gas can be released to the atmosphere. However, if the liquefied gas is ammonia liquid, it is necessary to prevent the vaporized gas from being released to the atmosphere due to the high toxicity of ammonia gas.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to make it possible to suppress the release of ammonia gas into the atmosphere even when the outer tank pressure of an ammonia tank that stores ammonia liquid rises to a pressure that requires the release of ammonia gas. [Means for solving the problem]

[0006] The present invention employs the following configuration as a means for solving the above problems.

[0007] A first aspect of the present invention is an ammonia receiving facility including an ammonia tank for storing ammonia liquid, and is configured to include a gas releasing section that is opened when an outer tank pressure of the ammonia tank exceeds a predetermined release pressure, and an ammonia absorbing liquid contact section that is capable of contacting an ammonia absorbing liquid capable of absorbing ammonia and a release gas released from the gas releasing section. [Effects of the Invention]

[0008] According to the present invention, when the pressure in the outer tank of the ammonia tank exceeds the release pressure due to some cause such as leakage of ammonia liquid, the gas release section is opened. The release gas released from the gas release section can be brought into contact with the ammonia absorbing liquid by the ammonia absorbing liquid contact section. Therefore, it is possible to absorb the ammonia contained in the release gas into the ammonia absorbing liquid and remove the ammonia contained in the release gas released to the atmosphere from the gas release section. Therefore, the present invention can suppress the release of ammonia gas to the atmosphere even when the pressure in the outer tank of the ammonia tank storing ammonia liquid rises to a pressure that requires the release of ammonia gas. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a flow diagram showing a schematic configuration of an ammonia receiving facility according to one embodiment of the present invention. [Figure 2] FIG. 1 is a schematic flow diagram showing a state in which no leakage of ammonia liquid X occurs in an ammonia receiving facility according to an embodiment of the present invention. [Figure 3] FIG. 1 is a schematic flow diagram showing a state in which leakage of ammonia liquid X occurs in an ammonia receiving facility according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

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

[0011] FIG. 1 is a flow diagram showing a schematic configuration of an ammonia receiving facility 1 of this embodiment. The ammonia receiving facility 1 of this embodiment is a facility for storing ammonia liquid X. For example, the ammonia liquid X stored in the ammonia receiving facility 1 of this embodiment is vaporized and supplied to a boiler or the like. As shown in FIG. 1, the ammonia receiving facility 1 of this embodiment includes an ammonia tank 2, a pressure adjustment unit 3, a pressure adjustment release unit 4, a gas release unit 5, an ammonia absorbing liquid contact unit 6, and a gas detector 7.

[0012] The ammonia tank 2 is a tank for storing ammonia liquid X, and is, for example, a flat-bottom cylindrical ammonia tank. The ammonia tank 2 stores ammonia liquid X supplied from the outside while maintaining it at a low temperature. As shown in FIG. 1, the ammonia tank 2 is a double-shell tank including an inner tank 2a and an outer tank 2b. The inner tank 2a is a metal container provided inside the outer tank 2b, and stores ammonia liquid X inside. The outer tank 2b is a metal or concrete container that surrounds the inner tank 2a from the outside, and is arranged so as to form a gap between the inner tank 2a and the outer tank 2b.

[0013] A space K is formed between the inner tank 2a and the outer tank 2b. A heat insulating material (not shown) is arranged in the space K. The space K is filled with a dry gas such as nitrogen gas. The ammonia tank 2 stores the ammonia liquid X inside the inner tank 2a at a low temperature.

[0014] The pressure adjustment unit 3 adjusts the pressure in the space K between the inner tank 2a and the outer tank 2b to a certain range. Even if there is a fluctuation in atmospheric pressure, for example, the pressure adjustment unit 3 adjusts the pressure in the space K to be within a predetermined pressure range. As shown in FIG. 1, the pressure adjustment unit 3 includes a pressure adjustment pipe 3a, a breathing tank 3b, and a pressure adjustment pipe opening / closing valve 3c.

[0015] The pressure adjustment pipe 3a is a pipe connected to the ammonia tank 2. As shown in FIG. 1, the pressure adjustment pipe 3a is connected to the space K between the inner tank 2a and the outer tank 2b. The pressure adjustment pipe 3a is also connected to the breathing tank 3b. In this way, the pressure adjustment pipe 3a connects the space K of the ammonia tank 2 and the breathing tank 3b. Such pressure adjustment pipe 3a allows the dry gas to flow between the space K of the ammonia tank 2 and the breathing tank 3b.

[0016] The breathing tank 3b is a cushion tank for absorbing volumetric changes of the dry gas in the space K of the ammonia tank 2, and is connected to the ammonia tank 2 via the pressure adjustment pipe 3a. When the pressure in the space K of the ammonia tank 2 drops, the breathing tank 3b supplies the dry gas to the space K of the ammonia tank 2 via the pressure adjustment pipe 3a. When the pressure in the space K of the ammonia tank 2 rises, the breathing tank 3b recovers the dry gas from the space K of the ammonia tank 2 via the pressure adjustment pipe 3a. This keeps the pressure in the space K of the ammonia tank 2 within a constant pressure range.

[0017] The pressure adjustment pipe on-off valve 3c is an on-off valve provided in the middle of the pressure adjustment pipe 3a. When the pressure adjustment pipe on-off valve 3c is closed, the pressure adjustment pipe 3a is closed, and when the pressure adjustment pipe on-off valve 3c is opened, the pressure adjustment pipe 3a is opened.

[0018] The pressure regulating release unit 4 is opened when the outer tank pressure (pressure in space K) of the ammonia tank 2 exceeds a preset regulating pressure, thereby releasing gas inside space K of the ammonia tank 2. The regulating pressure is a pressure set to maintain the pressure in space K at a normal state, and is set lower than a release pressure (a pressure at which gas needs to be released from space K when the pressure in space K rises abnormally), which will be described later. For example, when the pressure in space K rises beyond the pressure adjustment range of space K by the pressure adjustment unit 3, the pressure regulating release unit 4 releases or sucks in dry gas in space K so that the pressure in space K falls within the set range. As shown in FIG. 1, the pressure regulating release unit 4 includes a connecting pipe 4a, a connecting pipe relief valve 4b, and a connecting pipe opening / closing valve 4c.

[0019] The connection pipe 4a is a pipe that connects the ammonia tank 2 with the atmosphere. The connection pipe 4a is connected to the space K of the ammonia tank 2. The connection pipe 4a is, for example, open to the atmosphere. Such connection pipe 4a guides dry gas from the space K of the ammonia tank 2 to the atmosphere, or guides gas from the atmosphere to the space K. Note that the opening of the pressure adjustment release part 4 is not intended to prevent leakage of the ammonia liquid X from the inner tank 2a. Therefore, the pressure adjustment release part 4 releases or draws gas between the space K and the atmosphere.

[0020] The connecting pipe relief valve 4b is a relief valve provided in the middle of the connecting pipe 4a. The connecting pipe relief valve 4b opens the connecting pipe 4a when the pressure in the space K of the ammonia tank 2 exceeds the regulated pressure. The connecting pipe relief valve 4b closes the connecting pipe 4a when the pressure in the space K of the ammonia tank 2 does not exceed the regulated pressure.

[0021] The connecting pipe on-off valve 4c is provided in the connecting pipe 4a at a position downstream of the connecting pipe relief valve 4b. The connecting pipe on-off valve 4c can close the connecting pipe 4a as needed. By closing the connecting pipe on-off valve 4c, it is possible to stop the release of gas from the connecting pipe 4a to the atmosphere, regardless of the pressure in the space K of the ammonia tank 2.

[0022] The gas release unit 5 is opened when the outer tank pressure of the ammonia tank 2 (pressure in space K) exceeds a predetermined release pressure. As shown in Fig. 1, the gas release unit 5 includes a release pipe 5a, a release valve 5b, and a release pipe opening / closing valve 5c.

[0023] The release pipe 5a is a pipe connected to the space between the inner tank 2a and the outer tank 2b. This release pipe 5a releases the released gas G to the atmosphere, for example. However, the release pipe 5a may also guide the released gas G to abatement equipment.

[0024] The release valve 5b is a relief valve provided midway along the release pipe 5a. The release valve 5b opens the release pipe 5a when the pressure in the space K of the ammonia tank 2 exceeds the release pressure. The release valve 5b closes the release pipe 5a when the pressure in the space K of the ammonia tank 2 does not exceed the release pressure.

[0025] The release pipe on-off valve 5c is disposed near the downstream end of the release pipe 5a. In other words, the release pipe on-off valve 5c is disposed downstream of the release valve 5b on the release pipe 5a. Such a release pipe on-off valve 5c can close the release pipe 5a as needed. Closing the release pipe on-off valve 5c can stop the release gas G from the release pipe 5a to the atmosphere, regardless of the pressure in the space K of the ammonia tank 2.

[0026] The ammonia absorbing solution contact section 6 is capable of bringing the ammonia absorbing solution Y capable of absorbing ammonia into contact with the released gas G released from the gas releasing section 5. As shown in Fig. 1, the ammonia absorbing solution contact section 6 includes a gas-liquid contact section 6a, an ammonia absorbing solution supply pipe 6b, an ammonia absorbing solution on-off valve 6c, and an ammonia absorbing solution discharge pipe 6d.

[0027] The gas-liquid contact unit 6a is installed at a midpoint of the release pipe 5a. The gas-liquid contact unit 6a is also provided at a position downstream of the release valve 5b in the release pipe 5a. This gas-liquid contact unit 6a brings the ammonia absorbing solution Y supplied from the ammonia absorbing solution supply pipe 6b into contact with the release gas G flowing through the release pipe 5a. When the release gas G contains ammonia gas, the ammonia gas is absorbed into the ammonia absorbing solution Y by contacting the release gas G with the ammonia absorbing solution Y. As a result, the ammonia is removed from the release gas G.

[0028] For example, such a gas-liquid contact section 6a has a packing housed inside a container. The packing may be formed, for example, of a plurality of irregularly stacked ring members. Alternatively, the packing may be formed, for example, of a porous body having a large number of irregular holes formed therein. Such a packing lengthens the contact time between the ammonia absorbing solution Y and the released gas G, and also increases the contact area between the ammonia absorbing solution Y and the released gas G. According to such a gas-liquid contact section 6a, the ammonia absorbing solution Y and the released gas G can be efficiently contacted with each other.

[0029] When the ammonia absorbing solution Y is brought into contact with the released gas G in this way, the ammonia is absorbed into the ammonia absorbing solution Y, and therefore it becomes possible to send the ammonia to a detoxification facility or the like by utilizing gravity. Therefore, the ammonia can be sent to the detoxification facility using a thin pipe (an ammonia absorbing solution discharge pipe 6d described later).

[0030] However, the gas-liquid contact section 6a is not limited to a structure having a packing. For example, the ammonia absorbing solution Y may be sprayed, and the released gas G may be passed through the sprayed ammonia absorbing solution Y. Alternatively, a storage tank may be provided in which the ammonia absorbing solution Y is temporarily stored, and the ammonia absorbing solution Y may be passed through the liquid.

[0031] The ammonia absorbing solution supply pipe 6b is a pipe that connects a supply source of the ammonia absorbing solution Y to the gas-liquid contact section 6a. The ammonia absorbing solution supply pipe 6b is connected to the gas-liquid contact section 6a and guides the ammonia absorbing solution Y to the gas-liquid contact section 6a.

[0032] The ammonia-absorbing liquid on-off valve 6c is provided at a midpoint of the ammonia-absorbing liquid supply pipe 6b. Such an ammonia-absorbing liquid on-off valve 6c can open and close the ammonia-absorbing liquid supply pipe 6b. That is, when the ammonia-absorbing liquid on-off valve 6c is opened, the ammonia-absorbing liquid Y flows into the ammonia-absorbing liquid supply pipe 6b. When the ammonia-absorbing liquid on-off valve 6c is closed, the ammonia-absorbing liquid Y can be stopped from flowing into the ammonia-absorbing liquid supply pipe 6b. Furthermore, the ammonia-absorbing liquid on-off valve 6c can adjust the flow rate of the ammonia-absorbing liquid Y flowing into the ammonia-absorbing liquid supply pipe 6b.

[0033] The ammonia absorbent discharge pipe 6d is a pipe that connects the gas-liquid contact section 6a and the dilution tank Z. The ammonia absorbent discharge pipe 6d guides the ammonia absorbent Y discharged from the gas-liquid contact section 6a to the dilution tank Z. The dilution tank Z dilutes the supplied ammonia absorbent Y to make it harmless.

[0034] Here, the ammonia absorbing solution Y can be, for example, fire-extinguishing water used in a fire-extinguishing facility (not shown) installed in the ammonia receiving facility 1. The fire-extinguishing water is, for example, pressurized water that can be discharged from a sprinkler or the like. Therefore, by using the fire-extinguishing water as the ammonia absorbing solution Y, the ammonia absorbing solution Y can be supplied to the gas-liquid contact section 6a without using a pump or the like.

[0035] In addition, the gas-liquid contact part 6a is disposed at a position higher than the dilution tank Z. By disposing the gas-liquid contact part 6a at a position higher than the dilution tank Z, the ammonia absorbing solution Y can be supplied from the gas-liquid contact part 6a to the dilution tank Z by utilizing the hydraulic head pressure. For example, the gas-liquid contact part 6a may be provided at the ceiling part of the ammonia tank 2.

[0036] The gas detector 7 is connected to the ammonia tank 2 and detects ammonia gas in the space K of the ammonia tank 2. When the gas detector 7 detects ammonia gas, it notifies the detection of ammonia gas, for example, to a control room or the like.

[0037] For example, when ammonia is detected by the gas detector 7, the pressure adjustment pipe on-off valve 3c and the connecting pipe on-off valve 4c are closed. The pressure adjustment pipe on-off valve 3c and the connecting pipe on-off valve 4c are closed manually, for example, by an operator. Alternatively, a control device may be provided that controls the opening and closing of the pressure adjustment pipe on-off valve 3c and the connecting pipe on-off valve 4c, and the control device may automatically close the pressure adjustment pipe on-off valve 3c and the connecting pipe on-off valve 4c based on a detection signal input from the gas detector 7.

[0038] Next, the operation of the ammonia receiving facility 1 of this embodiment will be described with reference to FIGS.

[0039] 2 is a schematic flow diagram showing a state in which no leakage of ammonia liquid X occurs in the ammonia tank 2. In a state in which no leakage of ammonia liquid X occurs between the inner tank 2a and the outer tank 2b, ammonia is not detected by the gas detector 7. Therefore, the pressure adjustment pipe on-off valve 3c and the connection pipe on-off valve 4c are maintained in an open state. In addition, the release pipe on-off valve 5c is also maintained in an open state.

[0040] Furthermore, in a state where no leakage of the ammonia solution X occurs between the inner tank 2a and the outer tank 2b, the ammonia absorbing solution on-off valve 6c of the ammonia absorbing solution contact section 6 is closed. Therefore, the ammonia absorbing solution Y is not supplied to the gas-liquid contact section 6a. In other words, in a state where no leakage of the ammonia solution X occurs, the supply of the ammonia absorbing solution Y to the gas-liquid contact section 6a is stopped, as shown in FIG. 2.

[0041] When there is no leakage of the ammonia liquid X, the dry gas flows through the pressure adjustment pipe 3a between the space K of the ammonia tank 2 and the breathing tank 3b, and the pressure in the space K is adjusted to a certain range lower than the regulated pressure. At this time, the pressure in the space K does not exceed the release pressure set higher than the regulated pressure. Therefore, the release pipe 5a is closed. Therefore, as shown in FIG. 2, the supply of the release gas G to the gas-liquid contact section 6a is stopped.

[0042] Furthermore, when the pressure in the space K exceeds the regulated pressure without leakage of the ammonia liquid X, the connecting pipe relief valve 4b is opened and the dry gas is released to the atmosphere through the connecting pipe 4a, thereby suppressing the pressure rise in the space K.

[0043] When the pressure in the space K exceeds the pressure regulation pressure and further increases beyond the release pressure in a state where there is no leakage of the ammonia liquid X, the release valve 5b is opened and the dry gas is discharged from the space K as the release gas G through the release piping 5a. At this time, since there is no leakage of the ammonia liquid X, the release gas G does not contain ammonia. When there is no leakage of the ammonia liquid X, the release gas G released through the release piping 5a is released to the atmosphere through the gas-liquid contact section 6a. However, when there is no leakage of the ammonia liquid X, the ammonia absorbing liquid Y is not supplied to the gas-liquid contact section 6a, so the release gas G is released to the atmosphere without coming into contact with the ammonia absorbing liquid Y.

[0044] 3 is a schematic flow diagram showing a state in which ammonia liquid X is leaking from the ammonia tank 2. When ammonia liquid X is leaking between the inner tank 2a and the outer tank 2b, ammonia is detected by the gas detector 7. Therefore, the pressure adjustment pipe on-off valve 3c and the connection pipe on-off valve 4c are kept closed. In addition, the release pipe on-off valve 5c is kept open.

[0045] Furthermore, in a state where leakage of the ammonia liquid X occurs, the ammonia absorbing liquid on-off valve 6c of the ammonia absorbing liquid contact section 6 is opened. Therefore, the ammonia absorbing liquid Y is supplied to the gas-liquid contact section 6a through the ammonia absorbing liquid supply pipe 6b. That is, in a state where leakage of the ammonia liquid X occurs, the ammonia absorbing liquid Y is supplied to the gas-liquid contact section 6a as shown in FIG. 2.

[0046] When ammonia liquid X is leaking, dry gas does not flow through the pressure adjustment pipe 3a between the space K of the ammonia tank 2 and the breathing tank 3b. This prevents ammonia gas from flowing into the breathing tank 3b through the pressure adjustment pipe 3a. If the leakage of ammonia liquid X continues, the pressure in the space K will increase and exceed the regulated pressure. However, since the pressure adjustment pipe opening / closing valve 3c has already been closed, the ammonia gas will not be released to the atmosphere through the pressure adjustment release part 4.

[0047] If the leakage of the ammonia liquid X continues, the pressure in the space K will increase and exceed the release pressure. If the pressure in the space K exceeds the pressure regulation pressure and further increases and exceeds the release pressure, the release valve 5b will open and the release gas G containing ammonia gas will be discharged from the space K. In a state where the leakage of the ammonia liquid X is occurring, the release gas G released through the release piping 5a will be released to the atmosphere through the gas-liquid contact section 6a. In a state where the leakage of the ammonia liquid X is occurring, the ammonia absorbing liquid Y is supplied to the gas-liquid contact section 6a, so the release gas G will come into contact with the ammonia absorbing liquid Y, and will be released to the atmosphere after the ammonia is absorbed.

[0048] The ammonia absorbing solution Y that has absorbed ammonia is supplied from the gas-liquid contact section 6a through an ammonia absorbing solution discharge pipe 6d to the dilution tank Z. The ammonia absorbing solution Y supplied to the dilution tank Z is diluted so that the ammonia concentration becomes equal to or less than a specified value.

[0049] The ammonia receiving facility 1 of this embodiment as described above includes an ammonia tank 2 that stores an ammonia liquid X. The ammonia receiving facility 1 of this embodiment also includes a gas releasing section 5 and an ammonia absorbing liquid contacting section 6. The gas releasing section 5 is opened when the outer tank pressure of the ammonia tank 2 exceeds a predetermined release pressure. The ammonia absorbing liquid contacting section 6 is capable of contacting an ammonia absorbing liquid Y capable of absorbing ammonia with a release gas G released from the gas releasing section 5.

[0050] In the ammonia receiving facility 1 of this embodiment, when the outer tank pressure of the ammonia tank 2 exceeds the release pressure due to some cause such as leakage of ammonia liquid X, the gas release section 5 is opened. The release gas G released from the gas release section 5 can be brought into contact with the ammonia absorbent liquid Y by the ammonia absorbent liquid contact section 6. Therefore, the ammonia contained in the release gas G is absorbed by the ammonia absorbent liquid Y, and the ammonia contained in the release gas G released to the atmosphere from the gas release section 5 is removed. Therefore, the ammonia receiving facility 1 of this embodiment can suppress the release of ammonia gas to the atmosphere even when the outer tank pressure of the ammonia tank 2 storing the ammonia liquid X rises to a pressure that requires the release of ammonia gas.

[0051] In the ammonia receiving facility 1 of this embodiment, the ammonia tank 2 is a double-shell tank having an inner tank 2a in which ammonia liquid X is stored and an outer tank 2b that surrounds the inner tank 2a from the outside. The outer tank pressure of the ammonia tank 2 is the pressure in the space K between the inner tank 2a and the outer tank 2b. Note that the outer tank pressure here is the pressure when the inner tank 2a is damaged.

[0052] The ammonia receiving equipment 1 of this embodiment can prevent the ammonia gas contained in the release gas G released from the gas release section 5 from being released into the atmosphere even if ammonia liquid X leaks between the inner tank 2a and the outer tank 2b.

[0053] Furthermore, in the ammonia receiving equipment 1 of this embodiment, the gas release section 5 includes a release pipe 5a and a release valve 5b. The release pipe 5a is connected to the space K between the inner tank 2a and the outer tank 2b. The release valve 5b is provided at a midpoint of the release pipe 5a and opens when the pressure in the outer tank exceeds the release pressure.

[0054] In the ammonia receiving equipment 1 of this embodiment, when liquid ammonia X leaks into the space K between the inner tank 2a and the outer tank 2b, the liquid ammonia X vaporizes, causing an increase in pressure in the space K. Furthermore, when the pressure in the space K exceeds a preset release pressure, the release valve 5b opens, and release gas G is released through the release piping 5a. Therefore, the ammonia receiving equipment 1 of this embodiment can automatically release the release gas G to the outside of the ammonia tank 2 when liquid ammonia X leaks.

[0055] Moreover, in the ammonia receiving facility 1 of this embodiment, the ammonia absorbent solution contact section 6 includes a gas-liquid contact section 6a, an ammonia absorbent solution supply pipe 6b, and an ammonia absorbent solution on-off valve 6c. The gas-liquid contact section 6a is provided at a position downstream of the release valve 5b of the release pipe 5a, and brings the ammonia absorbent solution Y into contact with the release gas G. The ammonia absorbent solution supply pipe 6b is connected to the gas-liquid contact section 6a and guides the ammonia absorbent solution Y to the gas-liquid contact section 6a. The ammonia absorbent solution on-off valve 6c is provided at a midpoint of the ammonia absorbent solution supply pipe 6b.

[0056] The ammonia receiving equipment 1 of this embodiment can supply the ammonia absorbing solution Y to the gas-liquid contact section 6a by opening the ammonia absorbing solution on-off valve 6c. Furthermore, the supply of the ammonia absorbing solution Y to the gas-liquid contact section 6a can be stopped by closing the ammonia absorbing solution on-off valve 6c. That is, the ammonia receiving equipment 1 of this embodiment can switch between supplying and stopping the ammonia absorbing solution Y to the gas-liquid contact section 6a. Therefore, the ammonia receiving equipment 1 of this embodiment can cause the ammonia absorbing solution Y to flow through the gas-liquid contact section 6a only when leakage of the ammonia solution X occurs, and can prevent unnecessary consumption of the ammonia absorbing solution Y.

[0057] In the ammonia receiving equipment 1 of the present embodiment, the ammonia absorbing solution contact section 6 includes an ammonia absorbing solution discharge pipe 6d that connects the gas-liquid contact section 6a and the dilution tank Z. The ammonia receiving equipment 1 of the present embodiment can guide the ammonia absorbing solution Y that has absorbed ammonia from the release gas G to the dilution tank Z.

[0058] The ammonia receiving equipment 1 of this embodiment also includes a gas detector 7 that detects ammonia gas in the space K between the inner tank 2a and the outer tank 2b. The ammonia receiving equipment 1 of this embodiment makes it possible to detect leakage of the ammonia liquid X in a short period of time after the leakage occurs. For example, it takes time for the pressure in the space K to increase to the release pressure after leakage of the ammonia liquid X occurs. Therefore, by detecting ammonia gas with the gas detector 7, it becomes possible to perform operations such as closing the pressure adjustment pipe on-off valve 3c and the connecting pipe on-off valve 4c with ample time before the release gas G is released.

[0059] The ammonia receiving equipment 1 of this embodiment also includes a pressure adjustment unit 3 that adjusts the pressure in the space K between the inner tank 2a and the outer tank 2b. The pressure adjustment unit 3 also includes a pressure adjustment pipe 3a, a breathing tank 3b, and a pressure adjustment pipe on / off valve 3c. The pressure adjustment pipe 3a is connected to the space K between the inner tank 2a and the outer tank 2b. The breathing tank 3b is connected to the ammonia tank 2 via the pressure adjustment pipe 3a. The pressure adjustment pipe on / off valve 3c is provided in a midpoint of the pressure adjustment pipe 3a.

[0060] According to the ammonia receiving equipment 1 of this embodiment, it is possible to maintain a constant pressure in the space K between the inner tank 2a and the outer tank 2b. In addition, the pressure adjustment pipe 3a is provided with a pressure adjustment pipe on-off valve 3c. Therefore, even if the ammonia liquid X leaks into the space K, the pressure adjustment pipe on-off valve 3c can be closed to prevent ammonia gas from flowing into the breathing tank 3b.

[0061] The ammonia receiving equipment 1 of this embodiment also includes a pressure regulation release section 4 that opens when the pressure exceeds a regulating pressure that is set lower than the release pressure. The pressure regulation release section 4 also includes a connection pipe 4a and a connection pipe on-off valve 4c. The connection pipe 4a is connected to the space K between the inner tank 2a and the outer tank 2b. The connection pipe on-off valve 4c is provided midway along the connection pipe 4a.

[0062] According to the ammonia receiving equipment 1 of this embodiment, even if there is no leakage of ammonia liquid, if the pressure in the space K rises above the regulated pressure, the dry gas in the space K can be discharged to reduce the pressure in the space K. Furthermore, the connection pipe 4a is provided with the connection pipe on-off valve 4c. Therefore, even if the ammonia liquid X leaks into the space K, by closing the connection pipe on-off valve 4c, it is possible to prevent the ammonia gas from being released into the atmosphere via the connection pipe 4a.

[0063] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above-described embodiments. The shapes and combinations of the components shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0064] The above embodiment can also be described as follows, for example:

[0065] (Appendix 1) An ammonia receiving facility including an ammonia tank for storing ammonia liquid, a gas release section that is opened when the outer tank pressure of the ammonia tank exceeds a predetermined release pressure; an ammonia absorbing liquid contact portion capable of contacting an ammonia absorbing liquid capable of absorbing ammonia and the released gas released from the gas releasing portion; An ammonia receiving facility comprising:

[0066] (Appendix 2) the ammonia tank is a double-shell tank having an inner tank in which the ammonia liquid is stored and an outer tank that surrounds the inner tank from the outside, The outer tank pressure of the ammonia tank is the pressure in the space between the inner tank and the outer tank. 2. The ammonia receiving facility according to claim 1.

[0067] (Appendix 3) The gas release portion is a discharge pipe connected to a space between the inner tank and the outer tank; a discharge valve that is provided in the middle of the discharge pipe and that opens when the outer tank pressure exceeds the discharge pressure; 3. The ammonia receiving facility according to claim 2, comprising:

[0068] (Appendix 4) The ammonia absorbing liquid contact section a gas-liquid contact section that is provided in the release pipe at a position downstream of the release valve and that brings the ammonia absorbing liquid into contact with the release gas; an ammonia absorbing solution supply pipe connected to the gas-liquid contact section and guiding the ammonia absorbing solution to the gas-liquid contact section; an ammonia absorbing solution on-off valve provided at a midpoint of the ammonia absorbing solution supply pipe; 4. The ammonia receiving facility according to claim 3, comprising:

[0069] (Appendix 5) 5. The ammonia receiving facility according to claim 4, wherein the ammonia absorbing solution contacting section includes an ammonia absorbing solution discharge pipe connecting the gas-liquid contacting section and a dilution tank.

[0070] (Appendix 6) 6. The ammonia receiving facility according to any one of claims 2 to 5, further comprising a gas detector that detects ammonia gas in the space between the inner tank and the outer tank.

[0071] (Appendix 7) a pressure adjusting unit that adjusts the pressure in the space between the inner tank and the outer tank; The pressure adjusting unit is a pressure adjusting pipe connected to a space between the inner tank and the outer tank; a breathing tank connected to the ammonia tank via the pressure adjustment pipe; a pressure adjustment pipe opening / closing valve provided in a middle portion of the pressure adjustment pipe; Equipped with 7. The ammonia receiving facility according to claim 6.

[0072] (Appendix 8) a pressure regulating discharge part that is opened when the pressure exceeds a pressure regulating pressure that is set lower than the discharge pressure, The pressure regulating discharge portion is a connecting pipe connected to a space between the inner tank and the outer tank; a connecting pipe opening / closing valve provided at a midpoint of the connecting pipe; Equipped with 7. The ammonia receiving facility according to claim 6. [Explanation of symbols]

[0073] 1...Ammonia receiving equipment, 2...Ammonia tank, 2a...Inner tank, 2b...Outer tank, 3...Pressure adjustment section, 3a...Pressure adjustment piping, 3b...Breathing tank, 3c...Pressure adjustment piping on / off valve, 4...Pressure adjustment release section, 4a...Connecting piping, 4b...Connecting piping relief valve, 4c...Connecting piping on / off valve, 5...Gas release section, 5a...Discharge piping, 5b...Discharge valve, 5c...Discharge piping on / off valve, 6...Ammonia absorbing liquid contact section, 6a...Gas-liquid contact section, 6b...Ammonia absorbing liquid supply piping, 6c...Ammonia absorbing liquid on / off valve, 6d...Ammonia absorbing liquid discharge piping, 7...Gas detector, G...Released gas, K...Space, X...Ammonia liquid, Y...Ammonia absorbing liquid, Z...Dilution tank

Claims

1. An ammonia receiving facility including an ammonia tank for storing ammonia liquid, a gas release section that is opened when the outer tank pressure of the ammonia tank exceeds a predetermined release pressure; an ammonia absorbing liquid contact portion capable of contacting an ammonia absorbing liquid capable of absorbing ammonia and the released gas released from the gas releasing portion; An ammonia receiving facility comprising:

2. the ammonia tank is a double-shell tank having an inner tank in which the ammonia liquid is stored and an outer tank that surrounds the inner tank from the outside, The outer tank pressure of the ammonia tank is the pressure in the space between the inner tank and the outer tank.

2. The ammonia receiving facility according to claim 1.

3. The gas release portion is a discharge pipe connected to a space between the inner tank and the outer tank; a discharge valve that is provided in the middle of the discharge pipe and that opens when the outer tank pressure exceeds the discharge pressure; 3. The ammonia receiving facility according to claim 2, further comprising:

4. The ammonia absorbing liquid contact section a gas-liquid contact section that is provided in the release pipe at a position downstream of the release valve and that brings the ammonia absorbing liquid into contact with the release gas; an ammonia absorbing solution supply pipe connected to the gas-liquid contact section and guiding the ammonia absorbing solution to the gas-liquid contact section; an ammonia absorbing solution on-off valve provided at a midpoint of the ammonia absorbing solution supply pipe; 4. The ammonia receiving facility according to claim 3, further comprising:

5. 5. The ammonia receiving facility according to claim 4, wherein the ammonia absorbent contact section includes an ammonia absorbent discharge pipe connecting the gas-liquid contact section and a dilution tank.

6. The ammonia receiving facility according to any one of claims 2 to 5, further comprising a gas detector that detects ammonia gas in the space between the inner tank and the outer tank.

7. a pressure adjusting unit that adjusts the pressure in the space between the inner tank and the outer tank; The pressure adjusting unit is a pressure adjusting pipe connected to a space between the inner tank and the outer tank; a breathing tank connected to the ammonia tank via the pressure adjustment pipe; a pressure adjustment pipe opening / closing valve provided in a middle portion of the pressure adjustment pipe; Equipped with 7. The ammonia receiving facility according to claim 6.

8. a pressure regulating discharge part that is opened when the pressure exceeds a pressure regulating pressure that is set lower than the discharge pressure, The pressure regulating discharge portion is a connecting pipe connected to a space between the inner tank and the outer tank; a connecting pipe opening / closing valve provided at a midpoint of the connecting pipe; Equipped with 7. The ammonia receiving facility according to claim 6.

Images