JPH066955U - Plate fin type reactor - Google Patents

Abstract

(57) [Summary] [Objective] The plate fin method is adopted for the reactor to increase the heat transfer area, improve pressure resistance, and improve reaction efficiency. [Structure] A plurality of separators and corrugated fins are alternately stacked, and a high-temperature flow path through which a high-temperature fluid is inserted and a reaction flow path filled with a granular catalyst are alternately arranged in the stacking direction. The reaction fluid is inserted through the plurality of fluid insertion holes provided in the corrugated fins of the reaction channel, and the surface of the corrugated fins is arranged along the reaction channel. By avoiding this, the occurrence of a leak path that is likely to be formed in the contact portion between the surface of the corrugated fin and the catalyst is prevented. Also,
By arranging the reaction flow paths in the vertical direction, it is possible to prevent the gap formed above the catalyst from forming a leak path.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plate fin type reactor.

[0002]

[Prior art]

 Conventionally, a shell-and-tube type reactor is generally known as a reactor for producing fuel such as hydrogen gas. This reactor has a plurality of reaction tubes, each of which has a double-tube-shaped reaction channel filled with a catalyst and is formed in a shell. A hot fluid is passed through the shell to heat the catalyst. It also activates the reaction by the catalyst and has the advantage of excellent pressure resistance due to its structure, but on the other hand, in order to secure a large heat transfer area, the size of the device itself Has the disadvantage that it must be increased.

On the other hand, in the field of heat exchangers, corrugated fins are provided between separators arranged at parallel intervals as a heat exchanger that achieves pressure resistance, space saving, and improves heat transfer efficiency. There is known a plate fin type heat exchanger in which a plurality of heat exchange passages are arranged in a stacked state by being arranged.

[0004] It is considered that the plate fin system is adopted in the reactor to construct a reactor that saves space and has high reaction efficiency.

[0005]

[Problems to be solved by the device]

 However, in order to construct such a plate fin type reactor, a method of filling the catalyst in the heat exchange passages partitioned by the corrugated fins can be considered, but the catalyst is usually formed in a granular shape. Therefore, there is a drawback that a constant flow path (leak path) through which the reaction fluid is inserted is easily formed between the wall surface of the corrugated fin and the catalyst in contact with it. When this leak path is formed, the catalyst that comes into contact with the reaction fluid is limited to a part of the catalyst in the entire reaction flow path, which causes a decrease in reaction efficiency and a partial catalyst part. However, there is a problem that the catalyst replacement cycle is shortened and the catalyst replacement cycle is shortened, resulting in a decrease in economic efficiency.

The present invention has been made in view of the above-mentioned circumstances, and by adopting the plate fin method, it is possible to increase a heat transfer area, improve pressure resistance, and improve reaction efficiency. It is intended.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention proposes the following two means. The first means is to stack a plurality of separators arranged at parallel intervals and corrugated fins arranged between them in a laminated state, and to fill a high-temperature channel through which a high-temperature fluid is inserted and a granular catalyst. And the reaction flow paths are alternately arranged in the stacking direction, and the corrugated fins of the reaction flow paths are provided with a plurality of fluid insertion holes, and the reaction fluid flows in the direction of penetrating the fluid insertion holes. A plate fin type reactor that can be inserted is proposed. The second means proposes a plate fin type reactor in which reaction channels are arranged along the vertical direction.

[0008]

[Action]

 According to the plate fin type reactor according to the first means, the reaction fluid is filled in the reaction channel by inserting the reaction fluid in the reaction channel and the hot fluid in the high temperature channel. The catalyst is heated to activate the reaction between the catalyst and the reaction fluid. The raw material fluid that has entered the reaction channel is inserted through the fluid insertion holes provided in the corrugated fins in the direction that penetrates it, and as a result, a leak path that is easily formed at the contact portion between the wall surface of the corrugated fins and the catalyst. It will be evenly inserted around the catalyst without forming a pit. According to the plate fin type reactor according to the second means, the catalyst disposed in the corrugated fins is disposed below the reaction channel by arranging the reaction channels in the vertical direction. It is placed on the wall of the shaped fins and distributed so as to fill the insertion area of the reaction fluid.Therefore, when the catalyst filling amount is small, the gap formed above the catalyst may not be a leak path. it can.

[0009]

【Example】

 An embodiment of the plate fin type reactor according to the present invention will be described below with reference to FIGS. 1 and 2. In these drawings, reference numeral 10 is a reactor (plate fin type reactor), 11 is a side plate, 12 is a separator, 13A and 13B are corrugated fins, 13a is a rib member, 14 is a fluid insertion hole, and 15 is a reaction. Flow passage, 16 is a high temperature passage, 17 is a reaction passage inlet header, 18 is a reaction passage outlet header, 19 is a catalyst, 20 is a small space, 21 is a high temperature passage inlet header, 22 is a high temperature passage outlet header. is there.

In the reactor 10 of this embodiment, a plurality of separator plates 12 and a plurality of corrugated fins 13A and 13B are alternately laminated between two side plates 11 arranged at parallel intervals. It has a plurality of channels formed in parallel. This flow path is composed of a reaction flow path 15 for passing a reaction fluid as a raw material (for example, a mixed gas of methane gas and water vapor) to generate hydrogen as a fuel, and a high temperature flow path 16 for passing a high temperature fluid. The reaction channel 15 and the high temperature channel 16 are alternately arranged in a laminated state.

As shown in FIG. 1, the reaction flow path 15 is formed so as to linearly insert the fluid along the longitudinal direction of the reactor 10, and the reaction flow path inlet headers 17 and A reaction channel outlet header 18 is provided. As shown in FIG. 2, corrugated fins 13A are arranged in the reaction channel 15 so that the irregularities thereof are arranged in the vertical direction. The corrugated fins 13A are rib members for connecting the separators 12. The rib member 13a divides the interior of the reaction channel 15 into a plurality of small spaces 20 arranged in the up-down direction.

A plurality of small spaces 20 formed by partitioning the reaction channel 15 are filled with catalysts 19 for reforming the reaction fluid into hydrogen. The catalyst 19 is formed by, for example, solidifying nickel powder into a granular shape with ceramics so that the average particle diameter becomes about 3 mm, and the rib member 1 is provided on the upper surface of the rib member 13a partitioning each small space 20. It is placed so as to cover 3a, and is distributed over the entire flow area of the reaction fluid.

A plurality of fluid insertion holes 14 are formed in the rib member 13 a that partitions the small space 20. The fluid insertion hole 14 is formed with a diameter (for example, about 2 mm) smaller than the outer dimension of the catalyst 19, holds the catalyst 19 in the small space 20, and inserts the reaction fluid into the fluid insertion hole 14. By doing so, the reaction fluid can be guided from the reaction fluid inlet header 17 arranged in the lower portion of the reactor 10 to the reaction fluid outlet header 18 arranged in the upper portion of the reactor 10.

On the other hand, the high-temperature flow passage 16 has a high-temperature flow passage inlet header 21 arranged beside the reaction flow passage outlet header 18 and a high temperature fluid outlet arranged beside the reaction flow passage inlet header 17. A flow path that establishes communication with the header 22. The high-temperature fluid that has entered the high-temperature fluid inlet header 21 is introduced from a direction orthogonal to the reaction flow path 15, and as shown by the broken line in FIG. And the flow direction is changed to a right angle to flow along the longitudinal direction of the reaction channel 15. The catalyst 19 of the reaction flow passage 15 is mainly heated in the high temperature flow passage 16 in the portion along the longitudinal direction of the reaction flow passage 15, but in this portion, the flow direction of the high temperature fluid and the reaction fluid is The directions are opposite to each other, and the temperature difference between the reaction fluid that is heated during insertion and the high temperature fluid that is cooled during insertion is made uniform, and the heat transfer characteristics in each part of the reactor 10 are made uniform. Has been planned. Then, the high-temperature fluid is then changed again in the direction of flow at a right angle in the vicinity of the end of the reaction flow path 15 to be merged with the high-temperature fluid outlet header 22.

In order to generate hydrogen gas using the reactor 10 configured as described above, a high temperature fluid (for example, 700 ° C. to 800 ° C.) is injected from the high temperature channel inlet header 21 and the inside of the high temperature channel 16 is injected. At the same time, the reaction fluid is introduced from the reaction channel inlet header 17 and inserted into the reaction channel 15 to heat the catalyst 19 by the high temperature fluid to promote the reaction with the raw material.

Here, the reaction fluid flowing into the reaction channel inlet header 17 is distributed to each reaction channel 15 connected in parallel with the reaction channel inlet header 17, and the reaction channel 15 is illustrated. After being inserted in the direction indicated by the solid line in FIG. 1, they are merged at the reaction flow path outlet header 18 and discharged to the outside. When the reaction fluid is allowed to flow through the reaction flow path 15, the reaction fluid is allowed to pass around the catalyst 19 disposed therein, but the corrugated fins 13A arrange the irregularities along the flow direction. In addition, since the reaction fluid is circulated through the fluid insertion hole 14 provided in the corrugated fin 13A, the surface of the corrugated fin 13A is not arranged along the reaction channel 15, and It is possible to prevent the occurrence of a leak path that is likely to be formed in the contact portion between the surface of the shaped fin 13A and the catalyst 19. Moreover, since the reaction flow path 15 is arranged so as to pass the reaction fluid in the vertical direction, it is formed above the catalyst 19 when the catalyst 19 filled in the small space 20 is smaller than the volume of the small space 20. Since the gap is not formed along the insertion direction of the reaction fluid, it is possible to prevent the generation of a leak path formed by the gap.

<Other Embodiments> The reactor 10 according to the present invention can employ the following techniques. Instead of the fluid insertion hole 14 formed by boring in the wave-shaped fin 13A arranged in the reaction flow path 15, use a wire net, a grating, or the like. Use any other catalyst in place of the nickel-ceramic granulated catalyst 19. Using any hot fluid and reaction fluid. Make the shape of the fluid insertion hole arbitrary.

[0018]

[Effect of device]

 As described above, in the plate fin type reactor according to the first means of the present invention, a plurality of separators and corrugated fins are alternately stacked to form a high temperature flow path through which a high temperature fluid is inserted, and a granular shape. The reaction flow paths filled with the catalyst are alternately arranged in the stacking direction, and the reaction fluid is inserted in the direction through the plurality of fluid insertion holes provided in the corrugated fins of the reaction flow paths. Since it is a structure which makes it have the following effects. (1) The plate fin method in which the separator and the corrugated fins are laminated improves the pressure resistance against the pressure of the fluid passing through each flow path, and the laminated structure and the corrugated fins are used. It is possible to improve the heat transfer efficiency and form a compact reactor. (2) By avoiding arranging the surface of the wavy fin along the reaction flow path and preventing the formation of a leak path at the contact portion between the surface of the wavy fin and the catalyst, It is possible to improve the reaction efficiency by inserting it evenly around the circumference of. According to the plate fin type reactor according to the second means of the present invention, since the reaction flow paths are arranged in the vertical direction, in addition to the effect of the first means, it is formed above the catalyst. There is an effect that it is possible to prevent the gap from forming a leak path along the reaction channel.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a reactor according to the present invention.

FIG. 2 is a vertical sectional view showing the internal structure of the reactor of FIG.

[Explanation of symbols]

 10 Reactor (Plate Fin Type Reactor) 11 Side Plate 12 Separator 13A / 13B Corrugated Fin 13a Rib Member 14 Fluid Insertion Hole 15 Reaction Flow Path 16 High Temperature Flow Path 17 Reaction Flow Path Inlet Header 18 Reaction Flow Path Outlet Header 19 Catalyst 20 Small Space 21 High Temperature Channel Inlet Header 22 High Temperature Channel Outlet Header

Claims (2)

[Scope of utility model registration request] 1. A plurality of separators arranged at parallel intervals and corrugated fins arranged between them are laminated to each other,
A high-temperature flow passage through which a high-temperature fluid is inserted and a reaction flow passage filled with a granular catalyst are alternately arranged in the stacking direction, and the corrugated fin of the reaction flow passage has a plurality of fluid insertion holes. A plate fin type reactor, wherein the plate fin type reactor is provided, and a reaction fluid is inserted in a direction that penetrates the fluid insertion hole. 2. The plate fin type reactor according to claim 1, wherein the reaction flow passages are arranged along the vertical direction.