JPS5817557B2 - Generator for high-pressure vaporization of granular fuel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a generator for fixed bed high pressure vaporization of granular fuel with a vaporization medium containing free oxygen.

The generator for fixed bed high pressure vaporization of granular fuel is constructed with a single double wall to suppress the effects of temperature and pressure.

The annular chamber thus formed is filled with high-pressure boiling water at a slightly higher pressure than the inner chamber of the generator.

The inner wall therefore takes on the action of temperature, and the outer wall, whose temperature is slightly below the boiling point of water, takes on the action of pressure.

This inner wall is subject to severe corrosion, especially depending on the lignite used, and in some areas of the furnace shoulder this corrosion can reach a wear rate of several milliJ meters per year.

To reduce this corrosion, the generator can be equipped with a refractory lining.

The disadvantages of such linings are that the effective cross-sectional area of the generator is reduced and that the temperature inside the brickwork is very high, which can lead to deterioration of the generator.

Therefore, brick masonry was abandoned and attempts were made to prevent corrosion of the inner walls by cladding or overlaying with special steel plates.

Not only are such solutions expensive, but the results achieved are not always satisfactory.

Although the causes of corrosion have not been completely resolved, there is no doubt that high material temperatures accelerate corrosion.

An object of the present invention is to provide a fixed-bed high-pressure vaporization generating furnace with less corrosion of the metal inner wall and, therefore, a longer life.

The present invention is based on the problem of developing a fixed-bed high-pressure vaporization generator with metal inner walls that guarantees a sufficient service life.

The above problem can be solved according to the present invention by disposing a cylindrical guide plate in the annular chamber filled with water between the inner wall and the outer wall, and increasing the ratio of the thickness of the inner annular chamber to the thickness of the outer annular chamber from 1:1 to 1:1. This can be solved by keeping the value within the range of 3.

With the solution of the invention, a significant improvement in the heat transfer between the inner wall and the water is achieved by the evaporation of the water in the inner annular chamber, together with the internal circulation of the contained water.

In addition, in the current structure, the high heat load that occurs with local and temporal variations causes the generation of film-like steam, which also results in significant overheating of the iron plate and high thermal stress, which can be suppressed by the above method.

In this way, the solution according to the invention prevents the corrosion-promoting effects of high surface temperatures of the inner walls.

Next, embodiments of the present invention will be explained based on FIGS. 1 and 2.

According to FIG. 1, preferably 3000 r
A cylindrical guide plate 3 is arranged up to a height above n1rt.

The ratio of the thicknesses of the inner annular chamber 4 and the outer annular chamber 5 is 1:2 according to FIG.

This results in a high flow rate in the inner annular chamber, ie favorable conditions for bubble evaporation, and ensures sufficient separation of the vapor produced above the guide plate from the water descending in the outer annular chamber.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the high-pressure gas generating furnace, and FIG. 2 is a partial view of the annular chamber. ``Main part names and reference signs, 1...inner wall, 2...
...Outer wall, 3...Cylindrical guide plate.

Claims (1)

[Scope of Claims] 1. In a granular fuel high-height vaporization generating furnace having shell cooling with boiling water, a cylindrical guide plate 3 is provided between an inner wall 1 and an outer wall 2.
is arranged, and the guide plate divides the annular chamber filled with boiling water between the inner wall and the outer wall into an inner annular chamber and an outer annular chamber, and the lower L of the inner annular chamber and the outer annular chamber are open. A generator characterized by: 2 The ratio of the thickness of the inner annular chamber to the thickness of the outer annular chamber is 1:1.
The generating furnace according to claim 1, characterized in that the ratio is within the range of 1:3 to 1:3.