JPS6245441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-temperature steam generator, and more particularly to a high-temperature steam generator that directly heats steam to operate a mixed gas turbine that uses a mixture of steam and combustion gas to generate high-temperature steam. related to a device for

Conventionally, a boiler has been commonly used as a device for generating high-temperature steam.

However, since there is a natural limit to the high-temperature strength of the materials that make up the boiler, the upper limit of the steam temperature that can be obtained in the boiler is about 500 to 600°C.

Of course, it is possible to obtain even higher temperature steam by improving the boiler material, but since the heating mechanism of the boiler is indirect heating of steam etc., the heating temperature depends on the strength of the boiler material. Therefore, it is extremely difficult to obtain water vapor or the like at an extremely high temperature.

The present invention has been devised in view of the above circumstances, and the high-temperature steam generator of the present invention connects a combustion air introduction pipe and a fuel supply pipe to the rear of a combustion cylinder surrounding a combustion section, and A swirler is provided at the entrance of the air introduction pipe to the combustion tube, and a space is formed around the outer periphery of the combustion tube to introduce the steam to be heated. A large number of introduction holes are provided to introduce heated steam downstream into the combustion section, and the high temperature gas obtained by combustion in the combustion section and the steam supplied from the introduction holes are mixed in the combustion section to obtain high temperature steam. It is characterized by the following points.

Fuel here refers to gaseous fuels such as coal gas, natural gas, oil gas, gasoline, kerosene, LNG,
It is a liquid (liquefied) fuel such as LPG.

These fuel and air are supplied to the combustion section 3, where they are combusted to form combustion gas.

Although the composition of combustion gas varies slightly depending on the ratio of fuel and air supply, it is generally mainly composed of water, carbon dioxide, and carbon monoxide, and the amount of air supplied is usually as small as possible relative to the amount of fuel supplied. The excess air ratio is kept low, that is, the excess air ratio is kept close to 1. Furthermore, the composition of the combustion gas can be changed as appropriate in consideration of the use of the high-temperature steam formed by the apparatus of the present invention.

Next, a high-temperature steam generator of the present invention will be explained based on drawings showing one embodiment.

The figure is a schematic cross-sectional view showing a high-temperature steam generator according to the present invention.

An air introduction pipe 1 and a fuel supply pipe 4 are connected to the rear of a combustion tube 9 surrounding the combustion section 3, and air from the air introduction pipe 1 is introduced into the combustion section 3 via a swirler 2.

Meanwhile, another fuel, such as natural gas or
LNG is introduced through the fuel supply pipe 4 and is combusted in the combustion section 3 while being mixed with air to generate combustion gas.

Next, steam is introduced from a steam introduction duct (not shown) through a steam introduction pipe 5 into a space 6 of an introduction chamber 10 surrounding the outer periphery of the combustion tube 9 .

Since the water vapor introduced into the space 6 surrounds the combustion tube 9, it cools the combustion tube 9 and is preheated by combustion heat, and then flows through the numerous introduction holes 7 provided around the entire circumference of the combustion tube 9. Directly into the combustion gases.

As a result, the water vapor and the combustion gas are mixed, and the water vapor is directly heated by the combustion gas to become a high-temperature mixed gas, which is discharged from the high-temperature gas discharge pipe 8.

The number of introduction holes 7 can be selected as appropriate depending on the amount of water vapor supplied.

In general, the temperature of the generated high-temperature steam decreases as the supply amount of heated steam increases and as the position of the introduction hole 7 moves further downstream from the combustion section, so the temperature of the generated high-temperature steam decreases depending on the use and purpose of the generated high-temperature steam. Determine the heating steam supply amount or the position of the introduction hole 7.
In the case of the present invention, since the gas to be heated is water vapor,
There is no risk of chemical changes such as decomposition and oxidation due to heating with combustion gas.

In general, the temperature of the combustion gas immediately after combustion is approximately 2000 to 3000°C, although it varies depending on the excess air ratio.The temperature of the steam to be heated generally ranges from 500 to 600°C, although it also varies depending on the amount supplied. It is heated to 900-1500℃ and can produce high-temperature steam consisting of a mixture of combustion gas and heated gas.

Therefore, the present invention having the above configuration can achieve the following effects.

(1) Since the steam to be heated is introduced directly into the combustion section, a high heating temperature can be obtained rapidly.

(2) In order to introduce heated steam into the combustion section through a large number of introduction holes provided around the entire circumference of the combustion tube,
Mixing becomes uniform and heated steam with uniform temperature can be obtained.

(3) The air introduced through the combustion air introduction pipe is given a swirling flow by the swirler, so that it comes into contact with the fuel uniformly and rapidly, resulting in good combustion efficiency. Together with the heated steam uniformly introduced from the entire circumference of the combustion tube, it is possible to improve the mixing of gas and steam as a whole.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional view of a high-temperature steam generator showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Air introduction pipe, 2...Swirl device, 3...Combustion part, 4...Fuel supply pipe, 6...Space, 7...Introduction hole, 9...Combustion cylinder, 10...Introduction chamber.

Claims (1)

[Claims] 1 Connect the combustion air introduction pipe and the fuel supply pipe to the rear of the combustion tube that surrounds the combustion section, install a swirler at the entrance of the combustion air introduction tube to the combustion tube, and install heated steam around the outer periphery of the combustion tube. A number of introduction holes are provided around the entire circumference of the combustion tube through which the heated steam introduced into the space is introduced downstream into the combustion section, and the steam is combusted in the combustion section. A high-temperature steam generator configured to mix the obtained high-temperature gas and the steam supplied from the introduction hole in a combustion section to obtain high-temperature steam.