JPS63314296A - Reformer - Google Patents

Abstract

PURPOSE:To reform a gas with a compact device through a reduction in the amount of use of a catalyst and an improvement in the heat transfer rate, by dividing a catalyst layer into a plurality of thin layers so as to conduct heat transfer with heat condensation in heat transfer elements and utilizing a thermosiphon. CONSTITUTION:A raw gas a is passed through a porous sheet 4 placed in a reactor 20 and then through a catalyst 2 sandwiched between heat transfer elements 1. During this step, the raw gas absorbs the heat of steam c fed from an evaporator 21 and is consequently converted into a reformed gas b. The reformed gas flows outside the reactor 20. In the evaporator 21, the condensed water d in an evaporation pipe 10 is heated with a high-temp. fluid e to generate steam c. The steam c is passed through an evaporator outlet header 9 and a steam pipe 7 and flowed into a heat transfer element 1, where the steam condenses after application of heat to the catalyst 2 and the raw gas a and is passed through a reactor outlet header 6 and a condensed water pipe 8 to form condensed water d. The condensed water is then returned to an inlet header 11 of the evaporator 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a compact reformer that has a high heat transfer coefficient and uses a small amount of catalyst.

[Conventional technology]

A conventional reforming device will be explained with reference to FIG.

As shown by the arrow in FIG. 4, the raw material gas a flows into the reaction tube 11 through the inlet header 13 and the inlet branch pipe 14. The inside of the reaction tube 11 is filled with a catalyst 12, and while the raw material gas a passes therethrough, a chemical reaction accompanied by endotherms occurs and the raw material gas a is reformed.

A plurality of reaction tubes 11 are inserted into the heating furnace 5 and heated by burners 16 attached to the side wall surface.

The reformed gas (product gas) b is taken out through the outlet branch pipe 17 and the outlet header 18.

[Problem that the invention seeks to solve]

This type of catalyst is often used in the form of pellets or Raschig rings, but since the effective heat conduction rate is low, this is one of the reasons why the catalyst obstructs heat transfer from the heating side to the raw material gas. ing.

This means that many catalysts (
Furthermore, in order to achieve uniform heating, the reaction tubes must be sparsely arranged, making the reformer very large.

The present invention was developed in view of the current situation, and is intended to provide a compact reforming device that has excellent heat transfer properties and uses a small amount of catalyst.

[Means for solving problems]

The present invention provides a reaction vessel body having a raw material gas inlet and a reformed gas outlet, a plurality of hollow heat transfer elements disposed close to each other in parallel inside the reaction vessel body, and a plurality of hollow heat transfer elements between the heat transfer elements. A catalyst filled with voids, a pipe for introducing steam into the heat transfer element, a pipe for circulating the condensed ice produced in the heat transfer element, and generating steam from the condensed water. The present invention proposes a reforming apparatus characterized by comprising a circulation circuit formed with a steam generating means for producing steam.

[Effect]

Heat is transferred to the thin catalyst layer and the raw material gas, which are divided into multiple layers by a plurality of heat transfer elements within the reaction vessel main body, from the surfaces of the heat transfer elements that sandwich them. The heat is transferred by a thermosiphon. That is, heat from the external heating fluid is transferred to the p-squeezer by the steam generating means of the circulation circuit, the heat generates steam, and the base air is introduced into the heat transfer element. Inside the heat transfer element, steam condenses and heat is released in the form of latent heat, which is transferred to the catalyst and feed gas.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a side sectional view of the entire reforming device according to an embodiment of the present invention;
Figure 2 is a view taken along the line II-II in Figure 1, and Figure 3 (
3(a) is a longitudinal sectional view of the reactor, and FIG. 3(b) is an enlarged view of the main parts of the reactor.

In FIGS. 1 to 3, reference numeral 1 indicates a plurality of hollow plate-shaped heat transfer elements arranged close to each other in parallel inside the reaction vessel main body 3 of the reactor 20, and reference numeral 2 indicates filling in the gaps between the heat transfer elements 10. 4 is a perforated plate provided at the lower part of the inside of the reaction vessel main body 3 to hold the catalyst and serve as an inlet for the raw material gas; 5 is a hollow part to which the heat transfer element 1 is attached; A reactor inlet header 6 is attached to the heat transfer element 1 and communicates with the hollow part of the heat transfer element 1 and communicates with the condensate water pipe 8. A reactor outlet header 7 is connected to the evaporator. 'f! a steam pipe 8 connected to the evaporator outlet header 9 and the reactor inlet header 5 for introducing steam into the heat transfer element 1;
The heat transfer element 1 is connected to the reactor outlet header 6 and the evaporator inlet header 11 attached to the lower part of the evaporator tube 10.
a condensate pipe 10 for flowing condensed water from the evaporator to the evaporation pipe 10;
is an evaporation tube that is inserted into the evaporation container 12 of the evaporator 21 and generates steam by indirectly exchanging heat between the external heating fluid and #fine ice;
Reference numeral 21 denotes an evaporator for evaporating condensed water from the heat transfer element 1 by heat exchange with a heated fluid from the outside to generate steam to be sent to the heat transfer element IK.

Condensed water d in the evaporator tube 10 in the evaporator 21 in FIGS. 1 and 2
is heated and evaporated by the high-temperature heating fluid eK, becomes steam C, and passes through the evaporator outlet header 9 and the steam pipe 7 to the reactor 2.
0 flows between the heat transfer elements inside. Steam C imparts heat to catalyst 2 and raw material gas a within heat transfer element 1, condenses, passes through reactor outlet header 6 and condensed water pipe 8, becomes condensed water d, and is transferred to evaporator inlet header of evaporator 21. Return to 11.

In the reactor 20 of FIG. 3, the raw material gas a passes through the perforated plate 4 and the catalyst 2 sandwiched between the heat transfer elements 1, and is converted by an endothermic reaction to become the reformed gas b.
leak outside.

In the reactor, the catalyst is arranged close to each other in parallel and divided into many thin layers by a hollow heat transfer element in the form of a plate. As a result, the amount of catalyst used can be reduced and the equipment can be made more compact.

Further, due to condensed heat transfer within the heat transfer element, uniform heating is performed over the entire heat transfer surface.

Furthermore, since a thermosiphon is utilized, there is an advantage that heat from the externally heated fluid can be quickly transferred to the catalyst and the raw material gas.

〔Effect of the invention〕

(1) By making the catalyst layer thinner with multiple layers,
The effective heat transfer coefficient increases, enabling efficient heating, and reducing the amount of catalyst used, making the device more compact and reducing costs.

(2) Condensed heat transfer within the heat transfer element enables uniform heating over the entire heat transfer surface.

(3) Heat can be rapidly transferred from the heating fluid to the catalyst and raw material gas by the action of the thermosiphon.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the entire reforming device according to an embodiment of the present invention;
Figure 2 is a view taken along the line ■-■ in Figure 1, Figure 3 (a)
3(b) is an enlarged view of the main parts of the reactor, and FIG. 4 is an explanatory diagram of a conventional reforming apparatus. DESCRIPTION OF SYMBOLS 1... Heat transfer element, 2... Catalyst, 3... Reaction vessel main body, 4... Perforated plate, 7... Steam pipe, 8...
Condensed water pipe, 10... Evaporation pipe, 20... Reactor, 21
···Evaporator. Agent: Patent Attorney Akira Sakama, 2 people, 1 shoulder, 1 flash, A2 trap

Claims (1)

[Claims] A reaction vessel body having a raw material gas inlet and a reformed gas outlet, a plurality of hollow heat transfer elements arranged close to each other in parallel inside the reaction vessel body, and gaps between the heat transfer elements filled. a catalyst, a pipe for introducing steam into the heat transfer element, a pipe for circulating condensed water generated in the heat transfer element, and a steam generating means for generating steam from the condensed water. A reforming device comprising: a circulation circuit consisting of;