JPS6218801Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a boiler that requires rapid startup and an exhaust device for blow steam in its main steam pipe.

As shown in Fig. 1, a blow pipe p is provided in the superheater (not shown) and the main steam pipe P of a boiler B of a thermal power plant, etc., and during normal startup operation of the boiler B, a blow pipe p is provided. Immediately before the ignition of boiler B
The drain accumulated in the superheater and main steam pipe P is discharged. After discharging this drain, the blow valve in the main steam pipe P is fully closed, but the blow valve in the blow pipe P of the boiler superheater is slightly opened to let some steam out of the system from the middle and outlet of the superheater. This discharge warms up the superheater. In addition, in order to raise the main steam temperature flowing into the turbine T to a certain temperature during the warming-up of the superheater, the main steam pipe P is slightly opened from the inlet of the turbine T by slightly opening the blow valve of the main steam pipe P. Steam is being released outside the system. Thereafter, until the steam flowing into the turbine T reaches a specified temperature, the steam bypasses the turbine and enters a condenser (not shown) to warm up the main steam pipe P.

In addition, recently, power consumption patterns have changed, and boilers are now being operated at their rated capacity during the day, stopped at night, and started up early in the morning, which is repeated every day. As described above, in thermal power plants that are started and stopped every day, rapid startup is required at startup. However, during a shutdown period of about 8 hours at night, the metal temperature of the turbine casing and rotor is maintained at a high value, so it takes a long time to raise the main steam temperature to the specified temperature using the normal startup method ( (As mentioned above, the main steam bypasses the turbine and enters the condenser.) Therefore, during rapid startup, conventionally, in order to bring the main steam temperature close to the metal temperature in the turbine, the main steam is discharged from the superheater to the outside of the system. A method has been adopted to increase the rate of steam temperature rise in the superheater by increasing the amount of steam being heated (as the amount of steam passing through the superheater per unit heat input in the superheater decreases, the rate of steam temperature rise increases). .

With this method, a higher temperature and a larger amount of steam is discharged into the flash pipe main body 1 through the blow pipe p, where it is flashed.
It is separated into exhaust and drain, and each is released to the outside. In this case, conventionally, the second
As shown in the figure, each blow pipe p is connected to a blow steam pipe holder 2 attached to a flash pipe main body 1, and each blow pipe p is connected to a blow steam pipe holder 2 attached to a flash pipe main body 1. The blown steam from the pipe p is flashed and separated into exhaust and drain, and the exhaust is sent to the flash pipe main body 1.
Spray water nozzle 4a provided near the exhaust port of
After being reduced in temperature and pressure by spray water from the pipe, the pipe is discharged into the atmosphere through an exhaust pipe 5 and a silencer 6, which are connected to the upper opening of the flash pipe main body 1. In addition, after the drain is collected in the drain reservoir at the bottom of the flush pipe body 1,
It is designed to be discharged into a discharge groove 9 via a discharge pipe 7. In this case, the temperature of the waste water is detected by the temperature sensor 8b, and controlled by the spray water from the spray water nozzle 4b activated by the detection signal.

In the conventional blow steam exhaust device described above, (i) the noise generated when the blow steam flashes within the flash pipe main body 1 is merely reduced by the silencer 6;
Significant noise is inevitably transmitted into the atmosphere, contributing to noise pollution.

(ii) The exhaust gas that has been flashed and separated within the flash pipe main body 1 is only cooled by the spray water nozzle 4a near the exhaust port of the main body 1, so the temperature and pressure reduction effects are not sufficient; Therefore, the capacities of the exhaust pipe 5 and the silencer 6 must be set large, leading to increased costs.

There were drawbacks such as:

The present invention was proposed with the aim of eliminating the drawbacks of the above-mentioned conventional devices, and has an exhaust pipe with a silencer for discharging exhaust gas at the upper end, a built-in spray water nozzle for controlling exhaust temperature, and The flat pipe body has a drain pipe for discharging the drain from the drain reservoir at the lower end to the outside, and the flat pipe body is installed at an appropriate place on the lower stage side of the body, and the high temperature system blow steam of the boiler and main steam pipe is discharged from the flat pipe body. A thick-walled high-temperature system blow steam pipe nozzle that blows into the pipe body and a flat pipe are arranged concentrically within the pipe body, and the tip opening of the high-temperature system blow steam pipe nozzle is located approximately in the center of the side wall. The inner pipes are connected and open at the upper and lower ends, the spray water nozzle is installed directly above the upper end opening of the inner pipe, and the boiler and main steam pipes are installed at appropriate places on the upper side wall of the flash pipe body. This invention relates to a blow steam exhaust device characterized by comprising a low temperature system blow steam pipe stub for blowing low temperature system blow steam into a flash pipe main body.

The present invention will be specifically explained below with reference to an embodiment shown in FIG. In the figure, 1 is a flash pipe main body, 4a and 4b are spray water nozzles, 5 is an exhaust pipe, 6 is a silencer, 7 is an exhaust pipe, and 8a and 8b are temperature detectors, and the structure and operation of these members are shown. and the mutual relational structure is almost the same as that of the conventional blow steam exhaust device described above (equal parts are given the same reference numerals).
Reference numeral 9 denotes a high-temperature system blow steam pipe nozzle for introducing blow steam from the high-temperature system of the boiler and the main steam pipe into the flash pipe main body 1; It fluid-tightly penetrates the lower side wall and extends inside, and the thickness of the pipe wall is designed to shield the noise generated when the blow steam of the high temperature system flashes inside the flash pipe main body 1. It is formed to have an appropriate thickness to be effective. Reference numeral 3 denotes an inner tube which is arranged concentrically within the flash pipe main body 1 as shown in the figure, and whose upper and lower ends are opened, and whose lower end opening extends to near the liquid level of the drain reservoir at the bottom of the flash pipe main body 1. and a hole 3 provided in the center of the side wall.
The tip opening of the high-temperature blow steam pipe nozzle 9 is fluid-tightly connected to a. In the inner pipe 3, high-temperature system blow steam discharged from the boiler and the main steam pipe is sent to the flash pipe main body via a large number of high-temperature system blow pipes 9a and nozzle bases 9 attached to the nozzle base 9. 1 and is designed to shield the noise generated during flashing.
10 is a spray water nozzle disposed directly above the upper end opening of the inner pipe 3;
Like the spray water nozzle 4a, it is controlled by a detection signal from the exhaust temperature detector 8a to control the reduction in exhaust temperature and pressure. Reference numeral 11 denotes a low temperature system blow steam nozzle having a large number of low temperature system blow pipes 11a. As shown in the figure, the nozzle 11 is fluid-tightly connected to an appropriate position on the side wall of the upper stage side of the flash pipe main body 1, and is connected to the boiler. The low-temperature system blow steam from the superheater and the main steam pipe is flashed in the upper part of the flash pipe main body 1.

One embodiment of the device of the present invention is configured as described above, and the high-temperature system blow steam discharged from the boiler and the main steam pipe is passed through the high-temperature system blow pipe 9a,
The steam enters the inner pipe 3 through the nozzle stub 9 and is flushed there, but the noise generated during this process is blocked by the thick walls of the inner pipe 3 and the nozzle stub 9, preventing the noise from diffusing into the outside air. The inside of the flush pipe body 1 is sufficiently cooled and depressurized by the drain from the low-temperature system blow steam nozzle stub 11 installed on the upper stage side of the flush pipe body 1 and the spray water from the spray water nozzles 10 and 4a.
The generated steam is condensed into saturated water.

Since the device of the present invention has the above-described configuration and operation, according to the present invention, (1) blowing steam of high temperature system from the boiler and main evaporation pipe in the flash pipe main body 1; The noise generated during flushing is shielded by the thick pipe walls of the inner pipe 3 and the high-temperature system blow steam pipe nozzle 9, and is prevented from dispersing into the atmosphere, thereby preventing the occurrence of so-called noise pollution. Prevented.

(2) In addition, the inside of the flash pipe body 1 is sufficiently cooled and depressurized by the spray water nozzle 10 disposed directly above the inner pipe 3 and the drain from the low-temperature system blow steam pipe nozzle 11 on the upper stage side. Since the amount of exhaust gas discharged into the atmosphere through the exhaust pipe 5 and silencer 6 is reduced, the capacities of the exhaust pipe 5 and silencer 6 can be reduced, and costs can be reduced.

The following practical effects can be mentioned.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of a conventional device, FIG. 1 is an overall system diagram, FIG. 2 is a vertical cross-sectional view of a blow steam exhaust device, and FIG. FIG. 2 is a schematic vertical cross-sectional view of one embodiment. In Fig. 3, 1: Flash pipe body;
3: Inner pipe, 4a, 4b: Spray water nozzle, 5:
Exhaust pipe, 6: Silencer, 7: Drain pipe, 8a, 8
b: Temperature detector, 9: High temperature system blow steam pipe nozzle, 9a: High temperature system blow pipe, 10: Spray water nozzle directly above the inner pipe, 11: Low temperature system blow steam pipe nozzle, 11a: Low temperature system blow pipe .

Claims (1)

[Scope of utility model registration request] a flush pipe body having an exhaust pipe with a silencer for discharging exhaust gas at the upper end, a built-in spray water nozzle for controlling exhaust temperature, and a drain pipe for discharging drain from a drain reservoir at the lower end to the outside;
A thick-walled high-temperature system blow steam pipe nozzle is installed at a suitable location on the lower side of the flash pipe body, and blows high-temperature system blow steam from the boiler and main steam pipe into the flash pipe body, and the flash pipe main body. The inner pipe is arranged concentrically in the inner pipe, and is connected to the tip opening of the high temperature system blow steam pipe nozzle at the almost central part of the side wall, and has an open upper and lower end, and is directly above the upper end opening of the inner pipe. a spray water nozzle installed in the
It is characterized by comprising a low-temperature system blow steam pipe nozzle which is attached to an appropriate position on the upper side wall of the flash pipe body and blows the low-temperature system blow steam of the boiler and the main steam pipe into the flash pipe main body. Blow steam exhaust system.