JPS6110003A - Device for modifying fuel - Google Patents

Abstract

PURPOSE:To modify fuel economically by simplifying a process without modifying a low-temperature CO modifying device, by feeding a desorbed gas of a CO desorption column set at the outlet of a high-temperature CO modifying device of a device for modifying fuel to the inlet of the modifying device. CONSTITUTION:A hydrocarbon raw material is fed through the pipings 6 and 7 to the desulfurizer 3 to remove S, it and steam fed from the piping 9 are sent to the fuel modifing catalyst tube 2 set in the furnace 1, heated, processed into CO and H2, fed through the pipings 10 and 11 to the high-temperature CO modifying device 4, converted into CO2 and H2, sent through the pipings 12 and 14 to the CO adsorption column 5, the unreacted CO is adsorbed and removed, and fed through the piping 15 to the following device. On the other hand, steam, etc. is sent from the piping 16 to the other adsorption column 5', desorbed CO is fed through 17 to the high-temperature modifying device 4. Consequently, remaining CO can be reduced without laying a low-temperature CO modifying device, and the fuel is modified efficiently and econimically.

Description

[Detailed description of the invention] The present invention relates to a fuel reformer fRK.

Conventional Technology A fuel reformer that adds steam to hydrocarbons to reform them into technical hydrogen has conventionally consisted of a system including high-temperature and low-temperature CO shift devices and heat exchangers installed before and after each. For this reason, in order to lower the residual CO 1lIHi, high and low temperature C
It is necessary to improve the performance of the O-transformer, and if the performance is not improved, the lifespan of fuel cells used in subsequent stages, for example, will be shortened.

Problems to be Solved by the Invention An object of the present invention is to reduce the amount of CO remaining in the latter stage of the fuel reformer (and reduce the plant cost by lowering the performance of the CO shift converter. This objective has been realized due to the recent development of excellent CO adsorbents.

Means for Solving the Problems The present invention provides an apparatus for reforming hydrocarbons into hydrogen by adding steam to them, in which a 1 cc O adsorption tower is provided at the outlet of a high-temperature CO shift apparatus, and in the degassing process of the CO adsorption tower, the degassing gas to the CO
The present invention relates to a fuel reformer characterized in that it is equipped with means for supplying the fuel to the inlet side of the shift converter.

The configuration of the present invention will be explained below based on the drawings. Fig. 1 shows a part of the flow of a fuel reformer to explain the present invention in detail. In the figure, 1 is a heating furnace, 2 is a fuel reforming catalyst tube that performs a steam reforming reaction, 6 is a desulfurization device installed to preserve the catalyst, and 4 is carbon monoxide (carbon monoxide) produced after the reforming reaction. This is a high-temperature CO conversion device that converts CO) into carbon dioxide gas (CO) and hydrogen (f). 5 and 5' are CO adsorption towers.

The working hydrocarbon raw material is supplied through a pipe 6, and is supplied through a pipe 7 to a light desulfurization device 6, where sulfur is removed, and then to a pipe 9.
The fuel is supplied to the fuel reforming catalyst tube 2 through the pipe 8 along with the water vapor supplied by the fuel. Then, the heating furnace IK"C is heated to reform the hydrocarbons into CO and H2, and the pipe 10.11
It is then introduced into the high temperature CO converter 4. Here, CO
is further converted into CO, and H3, which are introduced into the CO adsorption tower 5 via piping 12.14. Here, unreacted CO is removed and supplied to the next stage equipment via piping 15. During this time, for example, a part of the hot gas after CO transformation or water vapor is supplied to the other CO adsorption tower 5' from the piping 16, and the desorbed CO is returned to the high temperature CO transformation device 4 through the piping 17.
supplied to For adsorption and desorption in the CO adsorption towers 5 and 5', CO
The thermal energy possessed by the gas after the shift converter 4 can be effectively used by adsorbing it as a cold source with an absorption refrigerator or by directly heating it and desorbing it. Further, the piping 13 is used to partially circulate gas and desulfurize the Cw material.

The above example shows an example using an absorbent using a temperature fluctuation method. For example, an absorbent using a cuprous chloride-based solution (known as a C05ORB solvent) can absorb CO at near room temperature and release and regenerate it at 120°C.

There are also adsorbents that use a pressure fluctuation method and have good performance. For example, iron
The zeolite adsorbent doped with copper fat metal is 9 in number.
/as'' and desorption is possible by reducing the pressure. In this case, a compressor for pressurization and a vacuum pump for depressurization and desorption are required.

Effects of the Invention In conventional equipment, a low-temperature CO shift device was installed in order to keep the residual COS at ~5%, but by replacing this with a CO adsorption tower, the complicated CO shift device can be made only for high temperatures. , the overall benefits are great. Also, high temperature C
The thermal energy generated in the O shift converter can be used as a cooling source during adsorption in the adsorption tower or as a heating source during desorption.
It is extremely effective in treating fever. Furthermore, CO in the desorption gas
In this case, the conversion reaction is carried out again in a high-temperature CO converter, but this increases the concentration of pure CO, which improves the reaction efficiency, which is preferable in terms of efficiency.

Therefore, the device of the present invention can be said to be an extremely effective system from a comprehensive standpoint.

[Brief explanation of the drawing]

FIG. 1 shows a part of the flow of a fuel reformer according to the present invention. Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Figure 1

Claims (1)

[Claims] In a device that adds steam to hydrocarbons to reform them into hydrogen, a CO adsorption tower is installed at the outlet of the high-temperature CO shift device, and the CO
A fuel reformer characterized in that, in the degassing step of the adsorption tower, means is provided for supplying degas to the inlet side of the CO shift converter.