JP2003329211A - Steam desuperheater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam desuperheater capable of reducing a required installation space. <P>SOLUTION: A cooling water supply part 3 and a vortex generator 2 are integrally disposed in a central part of a steam passage 1. The water supply part 3 on the upstream side is provided with a plurality of injection nozzles 6. The injection nozzles 6 and a cooling water pipe 8 are communicated by a cooling water passage 7. The water pipe 8 is installed with automatic control valves 12, 13, 14 each allowing arbitrary adjustment of a valve opening. The triangle pole-shaped vortex generator 2 houses a piezoelectric element as a vortex detection means. The piezoelectric element and the control valves 12, 13, 14 are respectively electrically connected to a control part 4. A cooling water is supplied from the nozzles 6 to steam flowing down through the steam passage 1 to reduce a temperature to a prescribed temperature, and a Karman vortex is generated by the vortex generator 2 and is detected. Thereby, a steam flow rate flowing down through the passage 1 is measured. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam reducing device capable of reducing the temperature of steam in a high pressure and high temperature state to a predetermined temperature, for example, a saturation temperature. 2. Description of the Related Art As a conventional steam cooling device, for example, a device disclosed in Japanese Patent Application Laid-Open No. 62-141407 has been used. This is done by installing a pressure control valve, a pressure detector, a steam flow rate detector, a temperature detector, and a water flow rate detector to supply the superheated steam into the superheated steam pipe, and detecting the pressure of the superheated steam. By adjusting the control valve, detecting the flow rate and temperature of the superheated steam, and supplying a predetermined amount of water from the water flow rate detector into the superheated steam, the superheated steam can be reduced to the steam having the saturated temperature. Things. [0003] In the above-mentioned conventional steam desuperheater, a steam flow detector must be installed separately from a portion for supplying cooling water into the superheated steam. There was a problem that the required space became large. Accordingly, an object of the present invention is to provide a steam cooling device capable of reducing a required installation space by integrating a cooling water supply unit and a steam flow detector. [0005] Means for solving the above-mentioned problems according to the present invention is to supply a cooling fluid based on the flow rate of high-pressure high-temperature steam flowing down a steam passage, In the case of reducing the temperature of steam to steam at a predetermined temperature,
A vortex generator that generates and detects a Karman vortex corresponding to the amount of steam flowing down the passage in the steam passage is attached, and a cooling fluid supply unit that supplies a cooling fluid into the steam passage almost integrally with the vortex generator. A plurality of cooling fluid supply units are provided, and a control unit for controlling the supply of cooling fluid from the plurality of cooling fluid supply units is provided in accordance with the number of vortices detected by the vortex generator. DETAILED DESCRIPTION OF THE INVENTION A vortex flowmeter for detecting a Karman vortex and measuring a flow rate is widely used in various industrial fields. The outline of the vortex flow meter is as follows: The flow velocity of the fluid is calculated from the number of Karman vortices that occur regularly downstream of the vortex generator placed in the flow, and the flow rate is multiplied by the cross-sectional area of the passage. Is what you want. [0007] By supplying a cooling fluid into the steam passage from a cooling fluid supply section provided substantially integrally with a vortex generator that generates Karman vortices, the steam in a high-temperature and high-pressure state is reduced to a predetermined temperature, and The steam flow rate flowing down the passage can be detected from the number of Karman vortices generated. [0008] By providing a control unit for controlling the supply of cooling fluid from a plurality of cooling fluid supply units in accordance with the number of vortices detected by the vortex generator, the number of vortices is large and the amount of passing steam is large. A large amount of cooling fluid is injected from the cooling fluid supply unit, and conversely, when the number of vortices is small and the amount of passing steam is small, a small amount of cooling fluid is injected to accurately reduce the steam temperature to a desired value. . In FIG. 1, a cylindrical steam passage 1 through which high-pressure and high-temperature steam flows, a triangular-pillar-shaped vortex generator 2 attached through the passage 1, and a vortex generator 2 are integrated. And a controller 4 that calculates and displays the steam flow rate from the detected Karman vortex number and controls the supply stop of the plurality of cooling fluid supply units 3 to form a steam desuperheater. Constitute. While the high-pressure and high-temperature steam flows down the passage 1 from left to right, the cooling fluid is injected and mixed from the cooling fluid supply unit 3 to reduce the temperature. Is generated and detected, and the control section 4 calculates the passing steam flow rate. FIG. 2 is an enlarged view of a cross section taken along line AA in FIG.
Shown in As shown in FIG. 2, a cooling fluid supply unit 3 is disposed upstream of a central portion of the steam passage 1, and a vortex generator 2 is disposed downstream thereof. The cooling fluid supply unit 3 has a semi-cylindrical shape, and a bottom surface portion thereof is fixedly attached to the flat portion 5 of the vortex generator 2, and a plurality of nozzles 6 are radially provided on the semi-cylindrical portion. The cooling fluid supply unit 3 and the nozzle 6 are arranged in a plurality of stages in an upper stage, a middle stage, and a lower stage over and below the steam passage 1. A cooling fluid passage 7 is provided between the semi-cylindrical portion and the flat portion 5 of the vortex generator 2. The cooling fluid passage 7 penetrates through the steam passage 1 and is connected to the upper cooling fluid pipe 8 shown in FIG. Automatic cooling valves 12, 13, and 14 electrically connected to the control unit 4 are attached to the cooling fluid pipe 8, respectively. The outlet side of the automatic control valve 12 is connected to the cooling fluid supply unit 3 in the upper part, the outlet side of the automatic control valve 13 is connected to the cooling fluid supply part 3 in the middle part, and the outlet side of the automatic control valve 14 is It is connected to the cooling fluid supply unit 3 in the lower part. A cooling fluid, for example, cooling water supplied from the cooling fluid pipe 8 to the cooling fluid passage 7 via the automatic control valves 12, 13, 14 is sprayed and sprayed into steam flowing down the passage 1 from the plurality of nozzles 6. Reduces the temperature of the steam. As shown in FIG. 2, the vortex generator 2 has a triangular prism shape, and alternately generates Karman vortices proportional to the flow rate at the edge portions 10 and 11 at both ends of the flat portion 5. The generated Karman vortex is detected by a piezoelectric element arranged inside the generator 2 and sent to the control unit 4 where the flow rate is converted. According to the steam flow rate converted by the control unit 4,
By controlling the opening / closing valves or the valve opening of the automatic control valves 12, 13, and 14, a large amount of cooling fluid is injected when the amount of passing steam is large, and a small amount of cooling fluid is injected when the amount of passing steam is small. By jetting, the steam temperature can be accurately reduced to a desired value. As described above, according to the present invention, the required space for installing the steam temperature reducing device can be reduced by integrating the cooling fluid supply unit and the steam flow rate detector.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional configuration view showing an embodiment of a steam desuperheater of the present invention. FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. [Description of Signs] 1 Steam passage 2 Vortex generator 3 Cooling fluid supply unit 4 Control unit 6 Nozzle 7 Cooling fluid passage 8 Cooling fluid pipes 12, 13, 14 Automatic control valve

Claims (1)

Claims 1. A cooling fluid is supplied based on the flow rate of high-pressure high-temperature steam flowing down a steam passage to reduce the temperature of the high-pressure high-temperature steam to steam at a predetermined temperature. A vortex generator for generating and detecting a Karman vortex corresponding to the amount of steam flowing down the passage, and a plurality of cooling fluid supply units for supplying a cooling fluid into the steam passage almost integrally with the vortex generator. , According to the number of vortices detected by the vortex generator,
A steam desuperheater comprising a control unit for controlling a stop of supply of cooling fluid from a plurality of cooling fluid supply units.