JPH11173505A - Steam temperature reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of thermal stress of a protective tube by regulating the spray angle of a plurality of nozzles spraying water toward the protective tube individually. SOLUTION: A spray water tube 2 is coupled, at the downstream end thereof, with four spray nozzles 4 arranged in a steam pipe 8 and introduced with spray water 3, e.g. boiler supply water. The spray water is directed toward a protective tube 6 through steam 5 introduced through the steam pipe 8 and sprayed from the nozzles 4 thus cooling the protective tube 6. Spray angle of four spray nozzles 4 can be adjusted individually such that the upper and lower nozzles are directed in the upper/lower direction symmetrically to the axis whereas two central nozzles are inclined by a specified angle in the left/right direction symmetrically to the axis. Furthermore the spray nozzle 4 is disposed at the forward end of the tube 6 while extending downstream and arranged concentrically in a steam temperature reducer 1 which is thereby protected against directly spray with water 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam desuperheater for reducing and adjusting the temperature of superheated steam in a boiler.

[0002]

2. Description of the Related Art Since the temperature of superheated steam changes depending on a change in the amount of evaporation of a boiler, it is necessary to adjust the temperature to maintain a required constant temperature.

[0003] As a method frequently used to adjust the superheat temperature, a superheat reducing means is provided in the middle of a connecting pipe connecting between the first superheater and the second superheater, and the superheated steam is controlled. There is a type in which the steam temperature is lowered by spraying water from a boiler or the like as spray water.

A typical example of such a conventional device will be described with reference to FIGS. Reference numeral 01 denotes a steam desuperheater, and a steam pipe 08 for connecting a first superheater and a second superheater (not shown).
It is interposed on the way.

Reference numeral 02 denotes a spray water pipe. The downstream end is connected to a spray nozzle 04 disposed inside the steam pipe 08, and boiler feed water or the like is introduced as spray water 03.
The spray temperature is reduced by spraying from a spray nozzle 04 into steam 05 guided through 8.

Reference numeral 06 denotes a protective cylinder which extends downstream with the disposition position of the spray nozzle 04 as a tip and is concentrically arranged in the steam desuperheater 01 to prevent the spray water 03 from directly hitting the steam desuperheater 01. And plays a role of protecting the steam desuperheater 01.

[0007]

In the conventional steam desuperheater 01 configured as described above, the protective cylinder 06 has a relatively small thickness in order to reduce the thermal stress caused by spraying of the spray water 03. As shown in FIG. 5, the spray nozzles 04 are open toward the downstream side as shown in FIG. 5. However, even if the number of spray nozzles is plural, they are fixed in the same direction. As shown in FIG. 6, the distribution of the spray water sprayed from the spray nozzle 04 and hitting the protective cylinder 06 has a wide width W _O, and the distribution of the spray water 03 in the same width W _O is not uniform.

[0008] Therefore, due to the non-uniform distribution, a large thermal stress is generated in the protective cylinder 06, and although it plays a role of protecting the steam desuperheater 01, the protective cylinder 06 itself has a risk of damage. It's not always nice just to be part of the plumbing.

The present invention has been made to solve the above-mentioned disadvantages of the prior art, and to provide an apparatus which prevents the protective cylinder 06 which is an important component of the steam desuperheater 01 from being damaged. It is an issue.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a steam desuperheater which lowers a steam temperature by spraying spray water into a steam flow. It is an object of the present invention to provide a steam desuperheater in which a plurality of spray nozzles for spraying spray water toward a cylinder are provided, and a spray angle of each spray nozzle can be individually adjusted.

That is, according to the present invention, by individually adjusting the spray angle of each of the plurality of spray nozzles for spraying the spray water onto the protection cylinder, the distribution of the spray water that hits the protection cylinder is narrowed and distributed. In order to prevent the occurrence of thermal stress.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the entire appearance of the steam desuperheater, FIG. 2 shows a view taken along the line II-II of FIG. 1, and FIG. 3 shows a state in which the protective cylinder is expanded. Reference numeral 1 denotes a steam desuperheater, and a steam pipe 8 for connecting a first superheater and a second superheater (not shown).
It is interposed on the way.

Reference numeral 2 denotes a spray water pipe, the downstream end of which is connected to four spray nozzles 4 arranged inside the steam pipe 8 so as to introduce boiler feed water or the like as spray water 3, and to introduce steam supplied through the steam pipe 8. The spray nozzle 4 sprays the fuel from the spray nozzle 4 to a protection cylinder 6 described later through 5 to reduce the steam temperature and cool the protection cylinder 6.

The four spray nozzles 4 are configured so that the respective spray angles 7 can be individually adjusted. For example, the upper and lower spray nozzles 4 have a constant spray angle symmetrically in the vertical direction about the axis. It can be adjusted so that it is inclined at an angle 7 and the two at the center are inclined at a constant spray angle 7 symmetrically in the left-right direction about the axis.

Reference numeral 6 denotes a protective cylinder, which extends downstream with the disposition position of the spray nozzle 4 as a tip and is concentrically disposed in the steam desuperheater 1, and as described above, the spray water 3 directly receives the spray water 3. , To protect the steam desuperheater 1.

In the present embodiment configured as described above, the spray angles 7 of the four spray nozzles 4 arranged in the up-down direction are changed to the up-down ones in the up-down direction as exemplified above. The spray water 3 is sprayed from the spray nozzle 4 by adjusting the angle so that the central one is inclined in the horizontal direction.

The spray water 3 sprayed from the spray nozzle 4 in this manner first cools the steam 5 to reduce the steam temperature, and then hits the protective cylinder 6 to cool it.
As for the distribution of the spray water 3 hitting the protection cylinder 6, the distribution width W is narrowed as shown by expanding the protection cylinder 6 in FIG. 3, and the distribution of the spray water 3 in the same width W is made uniform.

That is, according to the present embodiment, the distribution of the spray water 3 on the protection cylinder 6 is made uniform as described above, thereby suppressing the occurrence of thermal stress in the protection cylinder 6 and the protection cylinder 6. 6 can be prevented beforehand, and the life of an important part of the steam desuperheater can be extended.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to these embodiments.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0020]

As described above, according to the present invention, the spray water is sprayed toward the protection cylinder in the steam desuperheater configured to spray the spray water into the steam flow to lower the steam temperature. Since a plurality of spray nozzles are provided and the spray angle of each spray nozzle can be individually adjusted, the spray angle of each of the plurality of spray nozzles for spraying spray water on the protective cylinder is individually adjusted, The width of the distribution of spray water that hits the protective cylinder is narrowed to make the distribution uniform, preventing the occurrence of thermal stress, and extending the life of the protective cylinder, which is an important part of the steam desuperheater, thereby increasing reliability. It was possible to obtain a highly efficient steam desuperheater.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of a steam desuperheater according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a II-II plane of FIG. 1;

FIG. 3 is an explanatory view showing a development surface of a protection cylinder of the steam desuperheater of FIG. 1;

FIG. 4 is an explanatory diagram showing an outline of a conventional steam desuperheater.

FIG. 5 is an explanatory view showing a VV plane in FIG. 4;

FIG. 6 is an explanatory view showing a development surface of a protection cylinder of the steam desuperheater of FIG. 4;

[Explanation of symbols]

 1,01 Steam cooler 2,02 Spray water pipe 3,03 Spray water 4,04 Spray nozzle 5,05 Steam 6,06 Protection tube 7 Spray angle 8,08 Steam pipe

Claims (1)

[Claims] In a steam desuperheater configured to spray a spray water into a steam flow to lower a steam temperature, a plurality of spray nozzles for spraying the spray water toward a protection cylinder are provided. A steam desuperheater characterized in that spray angles can be individually adjusted.