JP4638679B2 - Gas hydrate production equipment - Google Patents

Description

The present invention relates to a gas hydrate manufacturing apparatus that increases the concentration of gas hydrate from 50% to 90% in a short time.

  Conventionally, when producing a high concentration (high purity) gas hydrate having a concentration of 90% or more, that is, moisture of 10% or less, a method for increasing the concentration of the gas hydrate from about 50% to 90% or more. There are the following two methods.

(1) Centrifugation of gas hydrate having a concentration of 50% to a concentration of 70%, or mechanical dehydration such as compression filtration, and subsequently gasifying the source gas and residual moisture from a concentration of 70% to a concentration of 90%. A method of increasing the generation of gas hydrate by contact with a liquid (for example, see FIG. 3 or Patent Document 1).

(2) A method in which the gas hydrate is generated and increased by bringing the source gas and residual moisture into gas-liquid contact by mechanical stirring in a pressure vessel from a concentration of 50% to a concentration of 90% (see FIG. 4 ).
JP 2003-105362 A (page 7-10, FIG. 2)

However, in the former method, since the fine gas hydrate leaks under the screen of the dehydrator, the yield decreases. Moreover, since it makes a dehydrator respond | correspond to a high voltage | pressure (for example, 30-50 kg / cm < ² >), it will be an excessive installation.

  On the other hand, in the latter method, when the gas hydrate concentration is 50% or more, it is almost in the form of powder, so the efficiency of mechanical stirring is lowered, and a long time is required to increase the gas hydrate concentration. . Further, in order to remove the heat generated by the gas hydrate, there is no effective means other than cooling from the outer wall jacket. If a predetermined amount of heat removal is to be obtained, the apparatus becomes excessively large.

The present invention has been made to solve the above-described problems, and the object of the present invention is to reduce the gas hydrate concentration from 50% to 90% or more in a short time without requiring an excessive apparatus. An object of the present invention is to provide a gas hydrate production apparatus that can be increased.

  In order to achieve the object, the present invention is formed as follows.

A gas hydrate production apparatus according to claim 1 of the present application is a gas hydrate for producing a substantially dried gas hydrate powder by reacting moisture contained in a wet gas hydrate powder with a raw material gas. In the production apparatus, a partition plate having an infinite number of gas ejection holes is provided in the reaction vessel, and a gas filling chamber is provided below the partition plate and a fluidized bed chamber is provided above the partition, and a wet state is introduced into the fluidized bed chamber. The gas hydrate powder is contained in the gas hydrate powder by jetting a raw material gas from countless gas ejection holes provided in the partition plate to fluidize the gas hydrate powder up and down. It is characterized by increasing the contact efficiency between moisture and source gas .

The gas hydrate production apparatus according to claim 2 of the present application is characterized in that the gas hydrate particles scattered from the reaction vessel are separated from the raw material gas by the collecting device and then returned to the reaction vessel .

The gas hydrate production apparatus according to claim 3 of the present application is characterized in that a reaction jacket is provided with a cooling jacket or a cooling pipe .

As described above, the invention according to claim 1 of the present application is a gas hydrate for producing a substantially dried gas hydrate powder by reacting moisture contained in a wet gas hydrate powder with a raw material gas. In the rate production apparatus, a wet state in which a partition plate having an infinite number of gas ejection holes is provided in the reaction vessel, a gas filling chamber is provided below the partition plate, and a fluidized bed chamber is provided above the partition plate. The gas hydrate powder is contained in the gas hydrate powder by jetting a raw material gas from countless gas ejection holes provided in the partition plate to fluidize the gas hydrate powder up and down. Since the contact efficiency between the moisture and the source gas is increased, the following effects are obtained. That is,
(1) Since the gas hydrate is stirred by fluidizing with the raw material gas, the contact degree between the moisture contained in the wet gas hydrate and the raw material gas is increased, and the gas hydrate production reaction time can be shortened. .

  (2) Since the heat removal of the gas hydrate generation heat is performed by sensible heat of the raw material gas, direct cooling is performed, and the cooling effect can be enhanced. Therefore, the reaction time of gas hydrate can be shortened.

  (3) Since the entire gas hydrate is agitated by the bubbling of the raw material gas, it is possible to prevent the gas hydrate from adhering to and depositing on the wall surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) Embodiment 1
As shown in FIG. 1, the gas hydrate production apparatus includes a pressure vessel (also referred to as a reaction vessel) 1, a cyclone 2, a circulating gas cooler 3, and a circulating gas blower 4.

  The pressure vessel 1 is formed in a cylindrical shape and has a circular or rectangular cross section. This pressure vessel 1 is formed by a large cross-sectional portion 1a, a small cross-sectional portion 1b, and a funnel-like portion 1c connecting them, and a partition plate 5 made of a porous plate, a sintered plate or the like is provided at the upper end of the small cross-sectional portion 1b. Provided. A portion below the partition plate 5 is referred to as a gas filling chamber 6 and a portion above the partition plate 5 is referred to as a fluidized bed chamber 7.

  Further, the pressure vessel 1 is provided with a circulation gas blower 4 on the outside thereof, and circulates the raw material gas g in the pressure vessel 1. And the gas hydrate particle | grains a which flowed out from the duct 8 provided in the upper part of the large cross-sectional part 1a of the pressure vessel 1 are collected by the cyclone (it is also called a collection apparatus) 2, and the large cross-sectional part 1a of the pressure vessel 1 is collected. It is trying to return to the lower part of.

  A circulation gas cooler 3 and a circulation gas blower 4 are arranged in this order in a pipe line 9 connecting the top 2a of the cyclone 2 and the gas filling chamber 6 of the pressure vessel 1 and taken out of the pressure vessel 1. The raw material gas g is cooled to a predetermined temperature by the circulating gas cooler 3 and then supplied to the gas filling chamber 6 of the pressure vessel 1.

  In addition, a raw material gas supply pipe 10 is provided in the middle of a pipe line 9 extending from the cyclone 2 to the circulating gas cooler 3 to supply the raw material gas g according to the progress of the hydrated dehydration reaction of the gas hydrate.

  Further, a raw material supply pipe 11 is provided in the large cross section 1 a of the pressure vessel 1, and a product discharge pipe 12 is provided in the funnel portion 1 c of the pressure vessel 1.

  Next, the operation of this gas hydrate production apparatus will be described.

  When the circulating gas cooler 3 and the circulating gas blower 4 are operated, the raw material gas (natural gas) g cooled to a predetermined temperature is supplied to the gas filling chamber 6 of the pressure vessel 1 and is finely provided on the partition plate 5. The fluid is ejected from the innumerable holes 15 into the fluidized bed chamber 7 of the pressure vessel 1.

  At that time, when the gas hydrate powder A in a wet state (for example, a purity of about 50%) is supplied from the raw material supply pipe 11 to the fluidized bed chamber 7 of the pressure vessel 1, the gas hydrate powder A in the wet state is separated from the partition plate. 5 is blown up by the raw material gas g ejected from the innumerable fine holes 15 provided in 5 and vigorously flows up and down. Meanwhile, the unreacted water contained in the wet gas hydrate powder A reacts with the raw material gas (natural gas) g to newly generate gas hydrate.

  Therefore, the generation of the new gas hydrate reduces the unreacted water contained in the gas hydrate powder A, and the purity of the gas hydrate is increased (for example, the purity is about 90%). The gas hydrate powder A 'having increased purity is sent from the product discharge pipe 12 to the next process (not shown).

In this example, the gas hydrate generation heat is removed using the sensible heat of the circulating gas (raw material gas).
(2) Embodiment 2
FIG. 2 shows a second embodiment of the gas hydrate production apparatus according to the present invention, wherein the heat generated from the gas hydrate is passed through the heat transfer pipe 13 provided in the fluidized bed chamber 7 of the pressure vessel 1 through the brine b. Try to remove. Further, instead of the heat transfer tube 13, a cooling jacket (not shown) may be provided outside the pressure vessel 1 to remove the heat generated by the gas hydrate. Other parts are the same as those in the first embodiment, and therefore, the same reference numerals are given to the same parts, and detailed description thereof is omitted.

It is a schematic block diagram of 1st Embodiment of the gas hydrate manufacturing apparatus which concerns on this invention. It is a schematic block diagram of 2nd Embodiment of the gas hydrate manufacturing apparatus which concerns on this invention. It is a conventional gas hydrate production process diagram. It is a conventional gas hydrate production process diagram.

Explanation of symbols

A Wet gas hydrate powder A 'Dry gas hydrate powder g Raw material gas 1 Reaction vessel 5 Partition plate 6 Gas filling chamber 7 Fluidized bed chamber 15 Gas ejection hole

Claims (3)

  In a gas hydrate production apparatus for producing almost dry gas hydrate powder by reacting moisture contained in a wet gas hydrate powder with a raw material gas, an infinite number of gas ejection holes are provided in the reaction vessel. The partition plate has a gas filling chamber below the partition plate and a fluidized bed chamber above the partition plate, and is provided on the partition plate for the wet gas hydrate powder introduced into the fluidized bed chamber. The gas hydrate powder is fluidized up and down by ejecting raw material gas from countless gas ejection holes, and the contact efficiency between the moisture contained in the gas hydrate powder and the raw material gas is increased. Gas hydrate manufacturing equipment. The gas hydrate production apparatus according to claim 1, wherein the gas hydrate particles scattered from the reaction vessel are separated from the raw material gas by a collecting device and then returned to the reaction vessel. The gas hydrate production apparatus according to claim 1, wherein the reaction vessel is provided with a cooling jacket or a cooling pipe.