JP2009174650A - Gas supply device and trailer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas supply device capable of flexibly coping with a request for supplying gas, and capable of effectively using a gas hydrate or solidified gas. <P>SOLUTION: This gas supply device has a plurality of tanks 3 for storing the gas hydrate 2 or the solidified gas, a heating means 5 arranged in the respective tanks 3 and heating and gasifying the gas hydrate 2 or the solidified gas stored in the tanks 3, a pressure detector 25 installed in the respective tanks 3 and detecting pressure in the tanks 3, and a control device 40 controlling heating of the heating means 5 according to a predetermined procedure based on pressure data from the respective pressure detectors 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas supply device capable of storing and gasifying solid gas hydrate, solidified gas obtained by cooling and solidifying carbon dioxide gas, and a trailer including the gas supply device.

As is well known, natural gas hydrate (hereinafter referred to as NGH) is an inclusion compound in which natural gas is taken into a space of a cage-like crystal structure formed by water molecules, and is an icy solid substance. . The NGH can embryonated many natural gas NGH1m ³ per about 160 Nm ^3. NGH is stably present at a temperature of about −80 ° C. under atmospheric pressure, and is also known for its self-preserving ability to suppress decomposition at a temperature of about −20 ° C. Compared to liquefied natural gas (LNG) This is advantageous in terms of equipment specifications and handling. From these facts, studies for practical application of each process, apparatus, and system such as production, transportation, and gasification of NGH have been made, and many techniques have been proposed.

  For example, natural gas produced from small and medium-sized gas fields is made into NGH pellets at the gas production location, and this is transported to a receiving base installed at the natural gas consumption location by a transport ship and stored in a storage tank. The NGH stored in the storage tank is sent to a gasifier installed in the receiving base, where it is regasified into natural gas and used as fuel for power generation equipment. Or, using a tank truck or the like, NGH is transported to another consumption place, where NGH is gasified and used for city gas or the like.

Using a tank truck, etc. to transport NGH to the consumption area, where NGH is gasified and used for city gas, etc., the water generated when NGH is gasified at the consumption area is taken as a bath, washbasin, toilet, etc. Has been proposed (see, for example, Patent Document 1). Also, regarding gas hydrate supply systems equipped with gas hydrate storage tanks or manufacturing plants, customer networks, delivery network, and central control center, grasp manufacturing status, customer demand status, allocation status of dispatch, and customer requests A technique for calculating the most efficient delivery route and delivering the gas hydrate to the customer based on this result has also been proposed (see, for example, Patent Document 2). Furthermore, a method has also been proposed in which NGH is produced in a transportation container, the transportation container is transported to a consumption area, and then the transportation container is heated to produce natural gas (see, for example, Patent Document 3).
JP 2002-161288 A JP 2005-242415 A JP 2000-304196 A

  The technique described in Patent Document 3 is for manufacturing, transporting, storing, and gasifying NGH in one container, and the structure becomes complicated. In particular, when there is little demand for gas at the customer and the gas supply is for a long time, the production part is in a dormant state and inefficient. In connection with the technique described in Patent Document 3, there is also a method of supplying NGH by transporting NGH to a gas consuming area, storing NGH pellets in the tank, gasifying NGH stored in the tank in the tank, and supplying natural gas. Conceivable. In this case, it is required that NGH can be used as effectively as possible, and can flexibly respond to the gas delivery request of the gas consumption area. At present, no technology that satisfies these requirements has been disclosed. This is not limited to NGH, and the same applies to solidified gases obtained by cooling and solidifying other gas hydrates or carbon dioxide.

  An object of the present invention is to provide a gas supply device capable of flexibly responding to a gas supply request from a gas demander and capable of effectively using a gas hydrate or a solidified gas. is there.

  The present invention according to claim 1 is a gas supply device that gasifies a gas hydrate or solidified gas stored in a tank and sends the gas to a demand destination, wherein a plurality of gas hydrates or solidified gas can be stored. Tanks, heating means provided in each of the tanks for heating and gasifying gas hydrate or solidified gas stored in the tanks, and pressure detectors attached to the respective tanks for detecting the pressure in the tanks, And a control device that performs heating control of the heating means according to a predetermined procedure based on pressure data from each pressure detector.

  According to a second aspect of the present invention, in the gas supply device according to the first aspect, the control device controls the heating means one by one in order, and there is little natural heat input from the outside among the plurality of tanks. The heating means provided in the tank is finally subjected to heating control.

  According to a third aspect of the present invention, there is provided the gas supply device according to the first or second aspect, wherein the control device operates the heating means of one tank that controls the heating means. When the pressure does not rise to a predetermined pressure, the heating means of the next one tank is controlled to be heated, and the heating means of the tank that has been controlled to heat is operated for a predetermined time. When the pressure of the tank does not rise to a predetermined pressure, the heating control of the heating means of the tank is completely terminated.

  According to a fourth aspect of the present invention, in the gas supply device according to any one of the first to third aspects, the control device further includes data transmission means capable of transmitting data through a network, When the first heating signal is output to the heating means provided in the tank, data for arranging the next gas hydrate or solidified gas is simultaneously transmitted to the gas hydrate or solidified gas shipment base via the data transmitting means. It is characterized by doing.

  Moreover, this invention is a trailer provided with the gas supply apparatus of any one of Claims 1-4.

  The gas supply apparatus of the present invention comprises a heating means for heating and gasifying gas hydrate or solidified gas, a pressure detector for detecting pressure, a plurality of tanks for storing gas hydrate or solidified gas, and each pressure. And a control device for controlling the heating means according to a predetermined procedure based on pressure data from the detector. By configuring the tank with a plurality of tanks and providing heating means for each tank, it becomes possible to gasify the gas hydrate or solidified gas stored in each tank. Furthermore, it is possible to gasify gas hydrate or solidified gas stored simultaneously from a plurality of tanks as necessary. Compared with the case where one large tank is installed, gas hydrate or solidified gas can also be stored. In addition, it is possible to respond flexibly to the gas supply request from the gas demander. Further, the tank capacity of one tank is small, and accordingly, the dead space is also small, and the gas hydrate or the solidified gas can be used effectively until the end. In addition, the apparatus configuration is simple and can be manufactured at low cost.

  Further, according to the present invention, the control device sequentially controls the heating means one by one, and finally controls the heating means provided in a tank with less natural heat input from the outside among the plurality of tanks. It is easy to grasp the remaining gas hydrate or solidified gas and to manage the operation. Further, since the heating means are controlled to be heated one by one, the gas hydrate or the solidified gas in the tank in which the heating means is not operated can be stored for a long time.

  According to the present invention, the controller further heats the next tank when the pressure does not rise to a predetermined pressure even when the heating means of the one tank that controls the heating is operated. The heating means of the tank that has been controlled for heating is operated for a predetermined time, and if the pressure of the tank does not rise to the predetermined pressure even after the predetermined time has elapsed, Since the heating control is completely terminated, the gas hydrate or solidified gas in one tank can be used to the end. The gas hydrate or the solidified gas has a time lag until the gas is generated even when heated, and the gas may be gradually generated after the heating. After heating by the heating means, if the use of the tank is stopped because the pressure in the tank does not rise within a short time, the gas hydrate or solidified gas that remains without being gasified increases, which is uneconomical. . In the present invention, there is no such worry.

  Further, according to the present invention, the control device further includes data transmission means capable of transmitting data through a network, and outputs a first heating signal to the heating means provided in a predetermined tank. Since the data for arranging the next gas hydrate or solidified gas is transmitted to the gas hydrate or solidified gas shipment base, arrangement and preparation of the next gas hydrate or solidified gas can be performed reliably.

  Moreover, since the trailer of the present invention includes the gas supply device, the trailer is pulled and transported by a tractor, and the trailer is transported and installed at a gas demand destination, thereby storing and / or gasifying gas hydrate or solidified gas. Gas can be easily supplied to users who do not have dedicated equipment. Furthermore, since the gas supply device provided in the trailer includes a data transmission means capable of transmitting data, it is necessary to arrange a new trailer that accommodates the gas hydrate or the solidified gas before the gas hydrate or the solidified gas is completely consumed. Can do.

  FIG. 1 is a process flow diagram showing a schematic configuration of a gas supply apparatus 1 as a first embodiment of the present invention. The gas supply device 1 can store a gas hydrate such as NGH or a solidified gas obtained by cooling and solidifying a gas such as dry ice, and at the same time, can gasify the gas hydrate or solidified gas to be stored and send the gas to a customer. Device. Hereinafter, the case of using NGH pellets will be described as an example.

  The gas supply device 1 stores NGH pellets 2 and tanks 3 (3 a, 3 b, 3 c, 3 d, 3 e, 3 f, 3 g, 3 h) that function as processing tanks when gasifying the stored NGH pellets 2. Eight units (tanks 3c, 3d, 3e, 3f, and 3g are not shown). In each tank 3, NGH pellets exhibiting a self-preserving effect, for example, NGH pellets 2 of about −20 ° C. are charged and stored. Although eight tanks 3 are shown in FIG. 1, it is one of the points that the present invention includes a plurality of tanks, and the number of tanks 3 is particularly limited as long as there are at least two tanks. It is not a thing. The tank 3 has a shape including an inverted pyramid portion at a lower portion of a prismatic straight body portion, and the tank wall surface has a heat insulating structure. However, the shape of the tank 3 is not limited to a specific shape, and may be a cylindrical tank according to the gas pressure to be sent out. The tank 3 may be a plurality of tanks by partitioning a large tank with a partition wall and providing a plurality of independent rooms in the large tank.

  Each tank 3 is equipped with a heating water supply device 5 (5a, 5b,... 5h) as a heating means for heating and forcibly gasifying the NGH pellets 2 to be stored. The heated water supply device 5 is attached to the tank 3 and spray nozzles 7 (7a, 7b,... 7h) for injecting heated water onto the NGH pellets 2, and a heated water supply pipe 9 for supplying heated water to the spray nozzle 7 ( 9h), and in the middle of the heating water supply pipe 9, a heating water supply valve 11 (11a, 11b,. ) And each heating water supply valve 11 is opened and closed by an opening / closing command from the control device 40. Although the heating water which can be used here is not specifically limited, room temperature industrial water, tap water, river water, etc. of about 10-30 degreeC can be used. These waters are preferable because they are relatively easy to obtain, special equipment such as heating water is unnecessary, and the running cost is low. The heating means for heating and forcibly gasifying the NGH pellet 2 is not limited to the above-mentioned heating water supply device, and although a heater or the like may be used, cost, heating uniformity, gasification If performance etc. are considered, a heating water supply apparatus is preferable.

  Gas delivery pipes 13 (13a, 13b,... 13h) for delivering the natural gas generated by gasification of the NGH pellets 2 are attached to the upper part of each tank 3, and eight gas delivery pipes 13a, 13b are attached. ,... 13 h are connected to the gas delivery mother pipe 15. Each gas delivery pipe 13 is a gas delivery valve 17 (17a, 17b,... 17h) which is a gas delivery means for opening and closing the natural gas by an external signal so that it can be delivered or not delivered. A stop valve 19 (19a, 19b,... 19h) is provided. In addition, the gas delivery pipe 15 includes a pressure control valve 21 that varies the valve opening degree according to a command from the control device 40 and a pressure detector 23 that detects the pressure in the gas delivery pipe 15 downstream of the pressure regulation valve 21. Is provided. The check valve 19 is for preventing the back flow of gas, and the set pressure is slightly higher than the control pressure of the pressure control valve 21. The pressure data of the pressure detector 23 is sent to the control device 40. Further, at the upper part of each tank 3, a pressure detector 25 (25a, 25b,... 25h) that detects the pressure in the tank 3 and transmits the pressure data to the control device 40, the pressure in the tank 3 rises abnormally. In this case, a safety valve 27 (27a, 27b,... 27h) for releasing the natural gas in the tank 3 and preventing the tank 3 from being damaged is provided.

  Each tank 3 is provided with drainage means 29 (29a, 29b,... 29h) for discharging water generated when the NGH pellet 2 is gasified. The drain means 29 includes drain pipes 31 (31a, 31b,... 31h) attached to the bottom of each tank 3, and water level detectors 33 (33a, 33b,... 33h) for detecting the water level in the tank 3. The water level which receives the signal from the water level detector 33 and outputs a control signal for adjusting the water level in the tank 3 to a predetermined water level to the drain valve 35 (35a, 35b,... 35h) provided in the drain pipe 31. It consists of a controller 37 (37a, 37b,... 37h). By these, the water level in the tank 3 can be adjusted to an arbitrary water level. The water level detector 33 that can be used here is not limited to a specific water level detector, and a differential pressure type liquid level gauge that has been generally used can be used. A commercially available controller can also be used as the water level controller 37. Further, instead of the water level controller, the signal of the water level detector 33 may be sent to the control device 40 and the drain valve 35 may be controlled by the signal from the control device 40.

  The control device 40 is a device that controls gas delivery and the like, and includes an input unit, a storage unit, an arithmetic processing unit, and an output unit, and a pressure for detecting the pressure in the gas delivery mother pipe 15 via the input unit. The detector 23, each pressure detector 25 for detecting the pressure in each tank 3, data sent from the gas demand destination, and the like are taken in and stored in the storage unit. The arithmetic processing unit reads out data and programs stored in the storage unit, performs arithmetic processing, and sends control signals to the gas delivery valves 17, the heating water supply valves 11, and the pressure control valves 21 via the output unit, to the customers. Control the delivery of natural gas. Further, the control device 40 has a data transmission function capable of transmitting data by connecting to a network such as the Internet 42. The arithmetic processing unit determines the remaining amount of gas that can be delivered from the amount of NGH pellets 2 supplied to the tank 3 and the amount of gas delivered, the amount of NGH pellets 2 supplied to the tank 3, the amount of gas delivered, and the gas requirements of the gas demand destination. The remaining gas delivery time can be calculated from the amount, and data such as the calculated remaining gas delivery time can be transmitted to the NGH pellet shipping base via the Internet 42. Such a control device 40 can be realized by using, for example, a computer, a programmable logic controller, or the like conventionally used for controlling a plant or an apparatus.

  FIG. 2 shows a schematic configuration of an NGH tank truck 100 including a trailer 104 as a second embodiment of the present invention. The same members as those in the gasifier 1 shown in FIG. The NGH tank lorry 100 is a trailer type tank lorry, and includes a tractor 102 and a trailer 104 which are towing vehicles. The trailer 104 is provided with a gasifier 1 capable of storing and gasifying the NGH pellets 2 shown in FIG. The NGH gasifier 1 includes four tanks 3a, 3b, 3c, and 3d on the front side, four tanks 3e, 3f, 3g, and 3h) on the far side and a total of eight tanks 3. The eight tanks are formed by dividing the inside of one large tank into eight equal parts by partition walls.

  An operation method of the gasifier 1 will be described using the NGH tank truck 100 shown in FIG. In addition, the operation method of the gasification apparatus 1 shown below is an example of an operation method, and it cannot be overemphasized that this invention is not limited to this. The gasifier 1 used here is a device that delivers natural gas at a pressure of about 0.1 MPa, and cannot hold a gas of 1 MPa or more. Here, it is assumed that the NGH tank truck 100 is attached to the natural gas demand destination and the natural gas is sent to the gas holder of the demand destination.

  After draining the drain pipe 31, after purging the inside of the tank 3 with nitrogen gas or natural gas as necessary, close each gas delivery valve 17, each heated water supply valve 11 and each drain valve 31, The tank 3 is filled with NGH pellets 2 cooled to about −20 ° C. that develops self-preserving properties. These are performed at a location with an NGH shipping base, an NGH pellet production facility, or an NGH pellet storage facility. After the NGH pellet 2 is filled, the NGH tank truck 100 is attached to the natural gas demand destination and the trailer 104 is cut off. The gas delivery mother pipe 15 of the gasifier 1 is connected to a gas holder (not shown) at the demand destination. When the gas delivery mother pipe 15 of the gasifier 1 is connected to the gas holder at the demand destination, the gas delivery pipe 15 is purged in accordance with a conventional method.

  Thereafter, all the gas delivery valves 17 (17a, 17b... 17h) are opened via the control device 40 with the pressure regulating valve 21 closed. The pressure control valve 21 delivers gas so that the pressure of the gas holder becomes a predetermined pressure. Specifically, it opens and closes according to a command from the control device 40 so that the pressure detected by the pressure detector 23 attached to the gas delivery mother pipe 15 becomes a predetermined pressure. Therefore, the gas stored in the gas holder is used, and when the pressure of the gas holder decreases, the pressure control valve 21 opens and natural gas is sent out. When there is no demand for gas, the pressure of the gas delivery mother pipe 15 does not drop, so it waits. It becomes a state. The water level of the tank 3 is adjusted to a predetermined water level via the drainage means 29. In the present embodiment, the pressure in the gas delivery pipe 15 corresponds to the gas demand signal of the demand destination.

  In standby state. Since each tank 3 can store the NGH pellet 2 and the wall surface has a heat insulating structure, the NGH pellet 2 can be stored for a long time. However, since the gasifier 1 does not have a refrigerator capable of actively cooling the NGH pellets 2 to be stored, the NGH pellets 2 are gasified by natural heat input and boil-off gas (hereinafter referred to as BOG). ) May occur. In this case, if there is no request for gas delivery, the BOG stops in the tank 3, and natural gas is released through the safety valve 27 when the pressure in the tank 3 exceeds the set pressure of the safety valve 27.

  When the gas delivery amount is small. When the pressure of the gas delivery mother pipe 15 decreases from the standby state, the control device 40 outputs an open command to the pressure control valve 21 so that the pressure detected by the gas detector 23 becomes a predetermined pressure. At this time, if the NGH pellet 2 is gasified by natural heat input and the pressure in the tank 3 is increased to a pressure at which the gas can be delivered, specifically, if the pressure is equal to or higher than the set pressure of the check valve 19, the gas Is sent out. If the pressures of all the tanks 3 are increased at this time, the gas is basically sent from all the tanks 3 instead of being sent only from a specific tank. Of course, when only the pressure of a specific tank 3 is increased due to heat input, gas is sent from the tank 3. In the case of having a plurality of tanks, it is easier to manage the storage of the NGH pellets 2 by using only one tank and not using the other tanks, but the NGH pellets 2 cannot avoid the occurrence of BOG. In this case, the BOG can be effectively used by using the BOG generated in all the tanks 3.

  When there is a lot of gas delivery. Here, the procedure for switching the tank 3 will also be described with reference to FIG. When a small amount of gas and BOG are being delivered (step S1), the gas delivery amount increases, and if only the BOG generated by natural heat input is insufficient, the gas delivery amount is insufficient, and is stored in one tank, for example, tank 3a. The NGH pellet 2 to be gasified is actively gasified and natural gas is sent out. Specifically, when the control device 40 determines that the pressure detected by the gas detector 23 has not reached a predetermined pressure even after the pressure regulating valve 21 is fully opened (step S2), the heating water provided in the tank 3a. Only the heated water supply valve 11a of the supply device 5a is opened, and heated water is injected to forcibly gasify the NGH pellet 2 (step S3). In such a state, the amount of natural gas generated increases in the tank 3a to which the heated water is injected, and the remaining tanks 3b to 3h send out BOG corresponding to the natural heat input. Of course, if natural heat input is small, BOG is not sent out from the tanks 3b to 3h. When the control device 40 determines that the pressure detected by the gas detector 23 has reached a predetermined pressure (step S4), the control device 40 controls the heating water of the heating water supply device 5a to stop jetting (step S5). Thereafter, the control device 40 performs similar control.

  If the pressure in the tank 3a does not rise to a predetermined pressure, that is, a pressure at which gas can be sent out even when the heated water is injected (step S6), the control device 40 causes the heated water to be injected into the next tank, for example, the tank 3e. The heating water supply valve 11e is opened (step S7). At the same time, the gas delivery valve 17a of the tank 3a is closed, and heated water is further injected into the tank 3a for a predetermined time (step S8). When heated water is injected into the tank 3a and the pressure in the tank 3a does not increase at a predetermined pressure, that is, a pressure at which gas can be delivered even after a predetermined time has elapsed (step S9), the NGH pellet 2 is placed in the tank 3a. After that, the heated water is not injected into the tank 3a (step S11). On the other hand, when heated water is injected into the tank 3a and the pressure in the tank 3a rises within a predetermined time, the gas delivery valve 17a is opened again (step S10), and the gas is delivered. Under such circumstances, a small amount of natural gas is sent from the tank 3a, a lot of natural gas is sent from the tank 3e, and BOG is sent from the other tanks. Of course, if the natural heat input is small, BOG is not sent from the tanks 3b, 3c, 3d, 3f, 3g, 3h. When the pressure in the tank 3a decreases, the heated water may be injected again into the tank 3a, and it may be determined whether or not the NGH pellet 2 remains in the tank from the pressure increase.

  The surface of the NGH pellets 2 in the tank 3 is covered with an ice coating, and the NGH pellets 2 tend to stick together. For this reason, when there are a large amount of NGH pellets 2 in the tank 3, when heated water is injected, gas is gasified within a short time and natural gas is generated. However, when the remaining amount of NGH pellets 2 is reduced, heated water is injected. It takes time until gas is generated. In particular, the lower the temperature of the heated water, the longer the time from when the heated water is jetted until gas is generated. For this reason, when it is determined that the NGH pellet 2 does not remain in the tank 3 because the pressure in the tank 3 does not rise to a predetermined pressure within a short time after spraying the heated water, Unused NGH pellets 2 remain. On the other hand, the gasifier 1 shown in this embodiment injects heated water into the tank 3a, and when the pressure in the tank 3a does not rise to a predetermined pressure even after a predetermined time has elapsed, Therefore, the NGH pellet 2 in the tank 3a can be used almost to the end.

  Thereafter, in the same manner, basically, control is performed so that heated water is jetted only to one tank 3, and the tanks 3 are used while being sequentially switched. The tank 3 is switched in a predetermined order. Thereby, grasping | ascertaining the quantity of the remaining NGH pellet 2 and operation management become easy. Furthermore, since the heating water supply device 5 is controlled one by one in order, the gas hydrate or the solidified gas in the tank in which the heating water supply device 5 is not operated can be stored for a long time. At this time, it is preferable to use the tank 3 having a small natural heat input among the plurality of tanks 3 last. In the present embodiment, the tanks 3b, 3c, 3f, and 3g are surrounded by the surrounding tanks 3 so that the natural heat input is relatively small compared to the other tanks 3. Used for. By using the tank 3 with less natural heat input last, it is easy to predict the remaining amount of the NGH pellet 2 in the tank 3 to be used last, and the operation management becomes easy.

  In addition, when the gas delivery amount is large. For example, if the amount of gas delivered is insufficient even when the heating water is injected only into one tank 3a, the control is performed so that the heating water is also injected into the next tank 3e. Under such circumstances, a lot of natural gas is sent from the tank 3a and the tank 3e, and BOG is sent from the other tanks. Of course, if the natural heat input is small, BOG is not sent from the tanks 3b, 3c, 3d, 3f, 3g, 3h. If the request for gas delivery decreases from this state, the control of the heating water supply device 5e of the tank 3e is terminated, and only the operation of the heating water supply device 5a of the tank 3a is controlled.

  In the case of a long standby state. Only the drainage means 29 of each tank 3 is operated, and the gas delivery valve 17 and the heated water supply valve 11 are closed. The water level of each tank 3 is made extremely low. The water stored in the tank 3 is kept in a state where it remains, and the water freezes and the water cannot be discharged.

  When the remaining amount of the NGH pellet 2 decreases, the control device 40 transmits a signal for arranging the next NGH tank truck in the following manner. When the control device 40 outputs a control signal for injecting heated water for the first time to the heated water supply device 5 of the last tank 3 from the control signal to the heated water supply device 5, a signal for arranging the next NGH tank truck at the same time Is transmitted to the NGH pellet shipping base through the Internet 42. As a result, the next NGH pellet 2 can be prepared before all the NGH pellet 2 is consumed and the gas cannot be delivered. Of course, when a control signal for injecting heated water for the first time is output to the heated water supply device 5 of the tank 3 immediately preceding the last tank 3, a signal for arranging the next NGH tank truck may be transmitted simultaneously. At the time of tank switching, it is easy to grasp the remaining amount of NGH pellets, so that arrangement management of the next NGH tanker truck becomes easy.

  Further, the signal for arranging the next NGH tank truck may be performed in the following manner. The control device 40 obtains the number of tanks 3 in which the NGH pellets 2 remain from the number of the heated water supply devices 5 for which the control has been completely completed, and determines the NHG from the number of tanks and the amount of NGH pellets 2 charged into one tank 3. The remaining amount of pellets 2 and the amount of gas that can be sent are calculated, and if they are determined to have reached predetermined amounts, a signal for arranging the next NGH tank truck is transmitted to the NGH pellet shipping base. In addition, the control device 40 receives the amount of NGH pellets 2 charged into the tank 3, the amount of gas sent out by the gas demand destination, and the data of the gas flow rate required by the gas demand destination from the gas demand destination, and the remaining gas from these data Calculate the possible delivery time, find the time to arrange the next NGH tanker truck from this time and the time required to transport the next NGH pellet, and when that time comes, to arrange the next NGH tanker truck The signal may be transmitted to the NGH pellet shipping base via the Internet 42.

  The NGH tank truck 100 of this embodiment is excellent in convenience because it can separate the tractor 102 and the trailer 104 that are towing vehicles and leave only the trailer 104 at the demand destination. Furthermore, since the container 3 of the NGH gasification apparatus 1 also functions as a storage tank for the NGH pellets 2, transportation, storage, and gasification can be performed with a single apparatus, which is advantageous in terms of equipment costs.

  Further, the NGH tank truck 100 shown in the present embodiment includes the gas delivery valve 17 in each tank, and the control device 40 controls the operation of the gas delivery valve 17 so that the gas can be delivered or cannot be delivered. It is possible to automate, and the operation of the gas supply device 1 can be fully automated. Further, the gas delivery main pipe 15 for delivering the gas delivered from each tank 3 to the demand destination is provided with a pressure control valve 21, and the control device 40 receives the gas demand signal of the demand destination. Since the control is performed, the gas can be delivered by adjusting the gas delivery pressure according to the demand of the customer.

  FIG. 4 is a process flow diagram showing a schematic configuration of a gas supply device 50 as a third embodiment of the present invention. The same members as those in the gas supply device 1 as the first embodiment shown in FIG. The configuration of the gas supply device 50 shown in FIG. 4 is similar to that of the gas supply device 1 shown in FIG. 1 except that the gas delivery pipe 13 and the gas delivery mother pipe 15 are not equipped with remote control valves, and The difference is that no pressure detector is mounted on the gas delivery pipe 15. The gas supply device 50 controls the operation of the heating water supply device 5 so that the pressure in the tank 3 becomes a predetermined pressure based on the pressure data detected by the pressure detector 25 by the control device 40, thereby Adjust the delivery amount. Similarly to the gas supply apparatus 1 shown in FIG. 1, the gas supply apparatus 50 can be installed on the trailer 104 and used as the NGH tank truck 100 shown in FIG.

  The method of using the gas supply device 50 is basically the same as that of the gas supply device 1 shown in FIG. Compared with the gas supply apparatus 1 of FIG. 1, the gas delivery pipe 15 is not equipped with a pressure control valve and a pressure detector, and therefore the gas pressure to the customer is likely to fluctuate. It is the same as the supply apparatus 1 and has a simpler apparatus configuration than the gasification apparatus 1 shown in FIG. In the case where the fluctuation range of the gas pressure and the gas flow rate sent out by the demand destination is not strictly limited, it can be suitably used when the gas delivery amount required from the demand destination is almost constant.

  As described above, the gas supply device of the present invention comprises a plurality of tanks, and a heating means is provided for each tank, thereby gasifying the gas hydrate or solidified gas stored in each tank. Is possible. Furthermore, it is possible to gasify gas hydrate or solidified gas stored simultaneously from a plurality of tanks as necessary. Compared with the case where one large tank is installed, gas hydrate or solidified gas can also be stored. In addition, it is possible to respond flexibly to the gas supply request from the gas demander. Further, by reducing the tank capacity of one tank, the dead space is also reduced, and the gas hydrate or the solidified gas can be used effectively until the end. Even if it is determined that all of the gas hydrate or solidified gas in the tank has been gasified, the heating means of the tank is operated again, and the gas hydrate in the tank is determined from the pressure of the tank after a predetermined time has elapsed. Alternatively, by using together the confirmation of the remaining solidified gas, the gas hydrate or the solidified gas can be used more reliably to the end.

  In the present embodiment, although an example in which NGH pellets are used has been shown, the shape and size of the NGH that can be used in the present invention are not particularly limited, and may be solid NGH. Furthermore, the gasifier and trailer of the present invention are used for storage, transportation and gasification of a solidified gas obtained by cooling and solidifying a gas hydrate other than NGH, for example, methane, ethane, carbon dioxide, or a mixture thereof, or dry ice. It goes without saying that it can be done. Further, in place of the pressure control valve 21 shown in FIG. 1, a flow rate control valve is provided to control the gas flow rate requested by the gas demand destination to be received from the gas demand destination and to receive the gas flow rate signal requested by the gas demand destination. May be.

It is a process flow figure showing a schematic structure of gas supply device 1 as a 1st embodiment of the present invention. The schematic structure of the NGH tank truck 100 provided with the trailer 104 as 2nd Embodiment of this invention is shown. It is a flowchart which shows the switching procedure of the tank 3 of the NGH gasifier 1 with which the NGH tank truck 100 of FIG. 2 is provided. It is a process flow figure showing a schematic structure of gas supply device 50 as a 3rd embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas supply apparatus 2 NGH pellet 3 Tank 5 Heated water supply apparatus 7 Spray nozzle 9 Heated water supply pipe 11 Heated water supply valve 13 Gas delivery pipe 15 Gas delivery main pipe 17 Gas delivery valve 21 Pressure control valve 23 Pressure detector 25 Pressure Detector 29 Drainage means 31 Drain pipe 33 Water level detector 35 Drain valve 37 Water level regulator 40 Controller 42 Internet 50 Gas supply device 100 NGH tank truck 102 Tractor 104 Trailer

Claims (5)

A gas supply device that gasifies gas hydrate or solidified gas stored in a tank and sends the gas to a demand destination,
A plurality of tanks capable of storing gas hydrate or solidified gas;
Heating means provided in each of the tanks for heating and gasifying gas hydrate or solidified gas stored in the tank;
A pressure detector mounted on each tank for detecting the pressure in the tank;
A control device for performing heating control of the heating means according to a predetermined procedure based on pressure data from each pressure detector;
A gas supply device comprising:   2. The control device according to claim 1, wherein the control device sequentially controls the heating means one by one, and finally controls the heating means provided in a tank having a small amount of natural heat input from the outside among the plurality of tanks. The gas supply device described.   Furthermore, when the pressure does not rise to a predetermined pressure even when the heating means of one tank that controls the heating means is operated, the control device controls the heating of the heating means of the next one tank, If the heating means of the tank that has been heated is operated for a predetermined time and the pressure of the tank does not rise to the predetermined pressure even after the predetermined time has elapsed, the heating control of the heating means of the tank is completely terminated. The gas supply device according to claim 1, wherein the gas supply device is a gas supply device.   Further, the control device includes data transmission means capable of transmitting data through a network, and outputs a first heating signal to the heating means provided in a predetermined tank, and at the same time, the gas hydrate or solidified gas is transmitted via the data transmission means. The gas supply device according to any one of claims 1 to 3, wherein data for arranging the next gas hydrate or solidified gas is transmitted to a shipping base.   The trailer provided with the gas supply apparatus of any one of Claims 1-4.

Images