JP2007309595A - Heated steam-type oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize phenomenon of decomposition of natural gas hydrate. <P>SOLUTION: The water produced by decomposition of natural gas hydrate 301 is evaporated by ignition of a first burner 213 applying the natural gas similarly produced by the decomposition as a fuel, and the produced steam is led into a cooking chamber 221, while further heated by ignition of a second burner 242 applying the natural gas produced by the decomposition of the natural gas hydrate 301 as the fuel, thus a temperature in the cooking chamber 221 is raised to a temperature necessary for cooking food material 401 received in the cooking chamber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heated steam oven using natural gas hydrate.

  In recent years, research on gas hydrates produced by bringing a raw material gas such as natural gas into contact with water has been underway. Hydrates are clathrate hydrates in which molecules (guests) of source gas are taken in clusters (cage structures) formed by water molecules. For example, natural gas hydrate is a structure in which natural gas composed mainly of methane, ethane, and propane is incorporated as a guest into a cluster composed of water molecules. Such a gas hydrate can be configured as various gas hydrates by replacing the raw material gas in addition to the natural gas hydrate. For example, if carbon dioxide is used as the source gas, carbon dioxide hydrate can be generated.

  Natural gas hydrate is a technique originally developed for the convenience of storage and transportation, as described in Patent Document 1, for example. For example, in the case of natural gas, it is currently common to store and transport in the form of liquefied natural gas (LNG). However, methane, which is the main component of liquefied natural gas, requires cryogenic conditions such as −162 ° C. for liquefaction, and maintenance of such cryogenic conditions is required for storage and transportation. For this reason, the production and maintenance of liquefied natural gas are costly.

  On the other hand, natural gas hydrate contains about 170 times the gas in an environment of −20 ° C. under atmospheric pressure, and exhibits a large self-preserving effect in an environment of about −20 ° C. For this reason, it has an advantage that handling in storage and transportation is relatively easy.

JP 2003-073679 A

  As described above, natural gas hydrate is a technology originally developed for convenience of storage and transportation. For this reason, the natural expectation for natural gas hydrate is a self-preserving effect in an environment of about −20 ° C. under atmospheric pressure. In other words, for storage and transportation, value is required for performance that is difficult to disassemble.

  On the other hand, natural gas hydrate decomposes into natural gas and water relatively quickly when placed in a room temperature environment. Such a phenomenon can be said to be avoided as much as possible if the natural expectation of natural gas hydrate is the convenience of storage and transportation. On the other hand, the inventors of this application rather focused on the phenomenon of decomposition of such natural gas hydrate, and proceeded earnestly research on its use. As a result, it came to invent the heating steam type oven.

  The heated steam type oven of the present invention has a storage unit capable of storing natural gas hydrate, and water that is generated by decomposing the natural gas hydrate in the storage unit and discharges natural gas to the outside. A decomposition apparatus having a first discharge section for gas and a second discharge section for natural gas, and a water storage section connected to the first discharge section for storing water supplied from the decomposition apparatus, A steam generation unit having a first burner connected to the second discharge unit and ignited by using natural gas supplied from the cracking device as fuel and heating the water storage unit, and a cooking chamber capable of storing an object to be cooked And a steam introduction path for guiding water vapor generated in the water storage section by heating by the first burner in the steam generation section to the cooking chamber, and disposed in the steam introduction path and connected to the second discharge section. The disassembly device It ignited the supplied natural gas as a fuel and a steam heating unit having a second burner for heating the steam introduction passage.

  ADVANTAGE OF THE INVENTION According to this invention, the phenomenon of decomposition | disassembly of a natural gas hydrate can be utilized for the heat cooking of the cooking object accommodated in the cooking chamber.

  FIG. 1 is a conceptual diagram for explaining the principle of the present invention. The heated steam type oven is constituted by a decomposition apparatus 101 and a heating cooker 201.

  The decomposition apparatus 101 has a storage portion 102 that can store a natural gas hydrate 301, and discharges water and natural gas generated by the decomposition of the natural gas hydrate 301 in the storage portion 102 to the outside. It has the 1st discharge part 103 for water, and the 2nd discharge part 104 for natural gas.

  The heating cooker 201 includes a steam generating unit 211, a cooking chamber 221, a steam introduction path 231, and a steam heating unit 241. The steam generation unit 211 includes a water storage unit 212 that is connected to the first discharge unit 103 and stores water supplied from the decomposition apparatus 101. The steam generation unit 211 also includes a first burner 213 that is connected to the second discharge unit 104 and ignites using natural gas supplied from the decomposition apparatus 101 as fuel. The first burner 213 heats the water storage unit 212. The cooking chamber 221 has a storage chamber structure that can store a food 401 that is a cooking object. The steam introduction path 231 has a pipe structure that guides water vapor generated in the water storage section 212 by heating by the first burner 213 in the steam generation section 211 to the cooking chamber 221. The steam heating unit 241 has a second burner 242 disposed in the steam introduction path 231. The second burner 242 is a structure that is connected to the second discharge unit 104 and ignites using natural gas supplied from the decomposition apparatus 101 as fuel, and heats the steam introduction path 231.

  In such a configuration, the natural gas hydrate 301 stored in the storage unit 102 of the decomposition apparatus 101 is decomposed into water and natural gas, for example, in a normal temperature environment. As a result, water is discharged from the first discharge unit 103 and natural gas is discharged from the second discharge unit 104. The water discharged from the first discharge unit 103 is guided to the water storage unit 212 of the steam generation unit 211, and the natural gas discharged from the second discharge unit 104 is guided to the first burner 213 to be the first burner. It becomes 213 fuel. When the first burner 213 ignites using natural gas as fuel, the water stored in the water storage unit 212 is heated to generate water vapor. The generated water vapor is guided to the cooking chamber 221 through the steam introduction path 231 and heats the food 401 stored therein. At this time, the natural gas discharged from the second discharge unit 104 is also guided to the second burner 242 and becomes fuel for the second burner 242. When the second burner 242 ignites using natural gas as fuel, the water vapor passing through the vapor introduction path 231 is further heated, and the water vapor introduced into the cooking chamber 221 is heated. Thereby, the water vapor | steam guide | induced to the cooking chamber 221 rises to the cooking temperature of the foodstuff 401. FIG. In this way, the food 401 is cooked by heating.

  FIG. 2 is a schematic diagram of a heated steam oven showing an embodiment of the present invention. Hereinafter, the heating steam type oven of this Embodiment is demonstrated based on FIG. In this case, parts corresponding to those shown in FIG.

  The inside of the decomposition apparatus 101 is divided into two vertically by a porous holding base 105. The holding table 105 has a structure capable of holding the natural gas hydrate 301. Therefore, the space above the holding table 105 constitutes the storage unit 102 capable of storing the natural gas hydrate 301, and the space below the holding table 105 is generated by the decomposition of the natural gas hydrate 301. A water storage tank 106 for storing water is configured. The first discharge unit 103 communicates with the water storage tank 106, and the second discharge unit 104 communicates with the storage unit 102.

  The first discharge unit 103 communicating with the water storage tank 106 provided in the decomposition apparatus 101 is connected to a water storage unit 212 included in the steam generation unit 211 of the heating cooker 201 via a water supply pipe 214. A water supply pump 215 is interposed in the water supply pipe 214. The water supply pump 215 is configured to supply water stored in the water storage tank 106 and supply the water toward the water storage unit 212.

  However, since the natural gas hydrate 301 stored in the storage unit 102 generates pressure during the decomposition and boosts the inside of the decomposition apparatus 101, the water stored in the water storage tank 106 by the pressure is stored in the water storage unit. It is also possible to send water to 212. For this reason, it is also possible to adopt a configuration in which the water supply pump 215 is omitted.

  The second discharge unit 104 communicating with the storage unit 102 provided in the decomposition apparatus 101 is connected to the first burner 213 via the fuel supply pipe 216. That is, the fuel supply pipe 216 is connected to a fuel supply unit (not shown) of the first burner 213. The natural gas hydrate 301 stored in the storage unit 102 generates pressure during the decomposition thereof, and pressurizes the interior of the decomposition apparatus 101. For this reason, the natural gas decomposed from the natural gas hydrate 301 is guided to the first burner 213 by the internal pressure of the decomposition apparatus 101.

  The water storage section 212 and the cooking chamber 221 included in the steam generation section 211 are connected by a steam introduction path 231. The steam introduction path 231 wraps around the cooking chamber 221, more specifically, the upper surface and the right side surface in FIG. 2, and is disposed in contact with the cooking chamber 221. A plurality of steam outlets 232 are formed in a part of the steam introduction path 231 so as to be positioned in contact with the upper surface of the cooking chamber 221. The positions where these steam outlets 232 are formed are the positions where the steam heating unit 241 is disposed. That is, the second burner 242 constituting the steam heating unit 241 is positioned on the outer wall of the steam introduction path 231 and facing the steam outlet 232. As described above, in the steam introduction path 231, the portion on the downstream side of the steam outlet 232 wraps around the cooking chamber 221. And it connects with the inside of the cooking chamber 221 by the connection port 233 formed at the terminal of the steam introduction path 231.

  The supply of the natural gas to the second burner 242 is a branch pipe 243 from the fuel supply pipe 216 that connects the second discharge unit 104 communicating with the storage unit 102 provided in the decomposition apparatus 101 and the first burner 213. It is realized by. That is, the branch pipe 243 branches from the fuel supply pipe 216, and this branch pipe 243 is connected to a fuel supply unit (not shown) of the second burner 242.

  The heating cooker 201 includes a reflux unit 251 that recirculates the steam guided to the cooking chamber 221 to the steam introduction path 231 again. The reflux unit 251 includes a reflux path 252 that connects the cooking chamber 221 and the steam introduction path 231. In FIG. 2, the reflux path 252 connects the upper left position of the cooking chamber 221 and a portion upstream of the steam heating unit 241 in the steam introduction path 231. A fan 253 is interposed in the reflux path 252. The fan 253 has a structure for drawing the steam guided to the cooking chamber 221 into the reflux path 252. Therefore, the recirculation unit 251 has a structure in which the steam guided to the cooking chamber 221 by the operation of the fan 253 is recirculated to the steam introduction path 231.

  The heating cooker 201 also has an exhaust duct 261 that allows the cooking chamber 221 to communicate with the outside. The exhaust duct 261 communicates with the lower left part of the cooking chamber 221 in FIG. 2, and escapes the steam guided into the cooking chamber 221 to the outside.

  Further, the cooking chamber 221 is provided with a door (not shown) that can be opened and closed, and the food 401 can be taken in and out by opening and closing the door. In addition, the cooking chamber 221 is provided with a food material holding unit 222 for placing the food material 401 thereon.

  In such a configuration, the natural gas hydrate 301 stored in the storage unit 102 of the decomposition apparatus 101 exhibits a high self-preserving effect in an environment of about −20 ° C. under atmospheric pressure. On the other hand, as the temperature increases, the natural gas hydrate 301 decomposes into water and natural gas. Therefore, in the decomposition apparatus 101, the natural gas hydrate 301 is placed in a temperature environment higher than −20 ° C., for example, a room temperature environment or a heating environment. As a result, the natural gas hydrate 301 starts to decompose rapidly.

  As a result, water is discharged from the first discharge unit 103 and natural gas is discharged from the second discharge unit 104. The water discharged from the first discharge unit 103 is supplied by the water supply pump 215 and sent to the water storage unit 212 of the steam generation unit 211. On the other hand, the natural gas hydrate 301 stored in the storage unit 102 generates pressure during the decomposition thereof, and pressurizes the interior of the decomposition apparatus 101. Therefore, the natural gas decomposed from the natural gas hydrate 301 is The gas is discharged from the second discharge unit 104 by the internal pressure of the decomposition apparatus 101, supplied to the first burner 213 through the fuel supply pipe 216, and supplied to the second burner 242 through the branch pipe 243. As a result, the natural gas decomposed from the natural gas hydrate 301 is led to the first burner 213 and becomes the fuel of the first burner 213, and is led to the second burner 242 and the fuel of the second burner 242. It becomes.

  Therefore, when the first burner 213 ignites using natural gas as fuel, the water stored in the water storage unit 212 is heated to generate water vapor. The generated water vapor is discharged from the steam outlet 232 to the cooking chamber 221 through the steam introduction path 231. At this time, since the second burner 242 also ignites using natural gas as fuel, the steam passing through the steam introduction path 231 is further heated, and the steam discharged from the steam outlet 232 and guided to the cooking chamber 221 is heated. The cooking chamber 221 goes around the cooking chamber 221 on the downstream side of the steam heating unit 241, and feeds steam into the cooking chamber 221 from the connection port 233. Since this water vapor is also water vapor heated by the second burner 242, the water vapor heated also from the connection port 233 is sent into the cooking chamber 221. Moreover, since the cooking chamber 221 wraps around the cooking chamber 221 on the downstream side of the steam heating unit 241, the cooking chamber 221 is also heated from the outside of the outer wall. In addition, the water vapor introduced into the cooking chamber 221 is recirculated to the steam introduction path 231 by the recirculation unit 251, and the recirculated water vapor is heated again by the steam heating unit 241. Therefore, the cooking chamber 221 is efficiently heated from the inside and outside, and the internal temperature rises to the cooking temperature of the food 401. In this way, the food 401 is cooked by heating.

  Here, part of the water vapor introduced into the cooking chamber 221 is released to the outside through the exhaust duct 261. Thereby, the internal pressure of the cooking chamber 221 is kept constant.

  As described above, according to the heating steam type oven of the present embodiment, the phenomenon of decomposition of the natural gas hydrate 301 can be used for cooking the food 401 that is the cooking object stored in the cooking chamber 221. it can.

  Note that the heated steam oven of the present embodiment may be configured as a portable type that can be transported for convenient use in camping or disasters, or may be configured as a stationary type.

It is a conceptual diagram for demonstrating the principle of this invention. It is a schematic diagram of the heating steam type oven which shows one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Decomposition | disassembly apparatus 102 Storage part 103 1st discharge part 104 2nd discharge part 211 Steam generation part 212 Water storage part 213 1st burner 221 Cooking chamber 231 Steam introduction path 232 Steam outlet 241 Steam heating part 242 2nd burner 251 Reflux section 252 Reflux path 253 Fan 261 Exhaust duct 301 Natural gas hydrate 401 Food (cooking object)

Claims (5)

A first discharge unit for water and a natural discharge unit that have a storage unit capable of storing natural gas hydrate, and discharge water and natural gas generated by decomposing the natural gas hydrate in the storage unit. A cracking device having a second discharge for gas;
A water storage unit connected to the first discharge unit for storing water supplied from the cracking device, and ignited by using natural gas connected to the second discharge unit and supplied from the cracking device as fuel; A steam generator having a first burner for heating the water reservoir;
A cooking chamber capable of storing cooking objects;
A steam introduction path for guiding water vapor generated in the water storage section by heating by the first burner in the steam generation section to the cooking chamber;
A steam heating unit disposed in the steam introduction path, connected to the second discharge unit, and having a second burner that ignites natural gas supplied from the cracking device as fuel and heats the steam introduction path;
A heating steam type oven.   The heated steam oven according to claim 1, wherein the steam introduction path has a steam outlet at a position of the steam heating unit. In the steam introduction path, a portion on the downstream side of the steam blow-out opening wraps around the cooking chamber and communicates with the inside of the cooking chamber.
A heated steam oven according to claim 2.   A recirculation path for connecting the cooking chamber and a portion of the steam introduction path upstream of the steam heating section; and a fan for drawing the steam led to the cooking chamber into the recirculation path. The heated steam oven according to claim 1, 2 or 3, further comprising a reflux part for recirculating the steam guided to the cooking chamber by the steam into the steam introduction path. The heated steam oven according to claim 1, 2, 3 or 4, further comprising an exhaust duct for communicating the cooking chamber with the outside.

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