JPH07217814A - Temperature lowering device for drain tube - Google Patents

Abstract

PURPOSE:To enhance a temperature lowering effect by sufficiently mixing sprayed water with high temperature water in a temperature lowering device for introducing the sprayed water to a drain tube for draining the high temperature drain from a blow tank. CONSTITUTION:A temperature lowering device introduces sprayed water S to a drain tube 2 for draining high temperature drain D from a blow tank, and comprises a bent tube 2a for generating turbulent flow of the tube 2, and a double tube in which an inner tube 8 of an extension of a spraying tube 7 having a plurality of sprayed water injection ports 9 provided in a circumferential direction to inject the water outward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pipe desuperheater provided in a drain pipe for discharging high-temperature water from a blow tank for recovering high-temperature water drain in a thermal power plant, a chemical plant or the like.

[0002]

2. Description of the Related Art A conventional desuperheater for a drain pipe of a blow tank for a thermal power pollutant will be described with reference to FIGS. 1
Is a drain tank for storing the high temperature water drain D from the boiler, and the high temperature water drain is discharged from the drain tank 1 through the drain pipe 2 to the drain tank 6. 5 is a desuperheater provided in the drain pipe 2, and the desuperheater 5 has a spray water pipe 7
Are connected. As shown in FIG. 4, the desuperheater 5 is connected to the straight pipe portion of the drain pipe 2 in a structure which is continuous with the drain pipe 2 in the middle of the drain pipe 2, and is connected with the spray water pipe 7. As shown by the arrow, the spray water S is sprayed into the high-temperature water drain D passing through the drain pipe 2 from the injection port 20 provided in the portion to cool the high-temperature water drain D.
In addition, 3 is a thermocouple provided downstream of the desuperheater 5 of the drain pipe 2, and the signal of the thermocouple 3 is input to the spray adjusting valve 4 provided in the spray water pipe 7, and the desuperheater is supplied. The temperature of the high temperature water drain D to the drain tank 6 is controlled by adjusting the flow rate of the spray water S to the drainage tank 5.

[0003]

In a thermal power plant, the high temperature drain generated at the time of starting the boiler is collected in a blow tank, and after being cooled by a desuperheater, discharged to a drain tank. However, if the temperature reducer cannot sufficiently lower the temperature, high temperature water flows into the drainage tank and the drainage tank is burned. Furthermore, it will flow back from the drainage tank to other equipment, which will interfere with the operation of other equipment. Therefore, the desuperheater for the drain pipe of the blow tank needs a desuperheater having an excellent effect of reducing the temperature.

However, as shown in FIG. 4, in the conventional desuperheater for the drain pipe of the blow tank of the thermal power plant, as shown in FIG.
The spray water is sprayed into the high temperature water drain from the spray port provided in the part where the spray water pipe is connected, so the spray water does not mix sufficiently into the high temperature water drain and the temperature reduction effect is sufficient. Not a thing.

The present invention is intended to provide a drain pipe desuperheater capable of solving the above problems.

[0006]

The present invention relates to a drain pipe desuperheater for injecting spray water into a high temperature water drain, which is provided in a drain pipe for discharging high temperature water drain from a blow tank for recovering high temperature water drain, The desuperheater is a double pipe provided in a curved pipe portion of the drain pipe and having a spray water pipe provided with a plurality of spray water outlets facing outward in a circumferential direction and inserted into the drain pipe. It is characterized by being.

[0007]

In the present invention, the desuperheater is provided in the curved pipe portion of the drain pipe in which turbulent flow occurs in the high temperature water drain. Further, the spray water is evenly sprayed into the high temperature water drain in the drain pipe from a plurality of injection ports provided in the circumferential direction toward the outside of the spray water pipe inserted in the drain pipe. by this,
The sprayed spray water mixes well with the hot water drain,
The excellent temperature reducing effect can be achieved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2, the same parts as those in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the desuperheater 5 is provided on the curved pipe portion 2a of the circular drain pipe 2 which is bent at a substantially right angle. The circular pipe-shaped inner pipe 8 which is an extension of the spray water pipe 7 and whose front end is closed is provided inside the drain pipe 2 in the curved pipe portion 2a, toward the downstream end of the drain pipe 2 and on the downstream side of the drain pipe 2. It is inserted parallel and concentric with the straight pipe. The inner pipe 8 is provided with a plurality of injection ports 9 facing outward and obliquely inclined to the downstream side of the drain pipe 2 at equal intervals in the circumferential direction, and provided in the circumferential direction. A plurality of sets of injection ports 9 are provided at intervals in the axial direction of the inner pipe 8. The curved pipe portion 2a of the drain pipe 2 and the inner pipe 8 constitute a desuperheater 5. In addition, 10 is the inner pipe 8
Is a swing stop for fixing the tip of the to the inner surface of the drain pipe 2.

In this embodiment, a turbulent flow of the high temperature water drain D occurs in the curved pipe portion 2a of the drain pipe 2. From the plurality of injection ports 9 provided in the circumferential direction of the inner pipe 8, as shown by an arrow A in FIG. 2, it is slanted toward the outside of the inner pipe 8 and toward the downstream side of the high-temperature water drain D. The spray water is sprayed evenly in the circumferential direction. In this way, in the hot water drain D in the turbulent state,
By spraying the spray water evenly in the circumferential direction from the plurality of spray holes in the circumferential direction of the inner pipe 8, the spray water is sufficiently and uniformly mixed with the high temperature water drain, and the temperature reducing effect can be enhanced. it can.

Therefore, the high temperature water drain discharged to the drainage tank 6 is sufficiently cooled, so that the drainage tank 6 is not damaged by fire, and the drainage tank 6 flows back to other equipment and is discharged from other equipment. It does not hinder driving.

Although the above embodiment relates to the desuperheater for the drain pipe of the blow tank of the thermal power plant, the present invention can be widely applied to the drain pipe of the blow tank for recovering the high temperature water drain of chemical plants and the like. .

[0013]

According to the present invention, a spray water pipe having a drain pipe desuperheater provided in a curved pipe portion of the drain pipe and provided with a plurality of spray water injection ports outwardly in the circumferential direction is provided in the drain pipe. The high temperature water drain inside the drain pipe becomes turbulent, and the spray water is sprayed evenly into the high temperature water drain in the curved pipe part of the drain pipe, and the high temperature water drain and the spray water are formed. Can be sufficiently mixed to enhance the temperature reduction effect of the high temperature water drain.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

2 (a) is an enlarged view showing a part of a portion A of FIG. 1 in a cross section, and FIG. 2 (b) is a cross sectional view taken along the line aa of FIG. 2 (a).

FIG. 3 is a system diagram of a blow tank, a drain pipe, a desuperheater, and the like of a conventional thermal power plant.

FIG. 4 is an explanatory diagram of the conventional desuperheater.

[Explanation of symbols]

 1 Blow tank 2 Drain pipe 2a Curved pipe part 3 Thermocouple 4 Spray adjustment valve 5 Desuperheater 6 Drainage tank 7 Spray water pipe 8 Inner pipe 9 Injection port D High temperature water drain S Spray water A Spray direction of spray water

Claims (1)

[Claims] 1. A drain pipe desuperheater for injecting spray water into the high temperature water drain provided in the drain pipe for discharging the high temperature water drain from a blow tank for recovering the high temperature water drain, wherein the desuperheater is a drain pipe. A drain pipe characterized in that the spray pipe is provided in the curved pipe part and has a plurality of spray water outlets directed to the outside in the circumferential direction, and the spray pipe is inserted in the drain pipe. Tube desuperheater.