JP2003148702A - Steam attemper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam attemper which has a simple mechanism and is inexpensive without using various kinds of sensors such as pressure sensors and flow rate sensors, control valves, and pumps for feeding coolant. SOLUTION: A liquid-vapor mixing and separating device 7 is connected with a steam pipe 1 in which an overheated steam flows. The first liquid reservoir 2 is connected at the bottom of the liquid-vapor mixing and separating device 7. The second liquid reservoir 3 is connected at the bottom of the first liquid reservoir 2. The reservoirs 2 and 3 are connected with a high-pressure liquid flow line 9. A connecting line 4 is connected with the bottom of the reservoir 3, and the upper edge of the connecting line 4 is connected with the inlet side of the mixing and separating device 7 of steam pipe 1. An in-line type heat exchanger 28 is installed in the connecting line 4. The overheated steam in the steam pipe 1 is cooled up to a predetermined temperature by a coolant fed to the steam pipe 1 from the first liquid reservoir 2 and the second liquid reservoir 3 through the connecting line 4.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reducing the temperature of so-called superheated steam having a temperature higher than a saturation temperature 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 into the superheated steam from the water flow rate detector, the superheated steam can be reduced to the steam at the saturated temperature. Things. [0003] The above-mentioned conventional steam deheating apparatus requires a pressure control valve, various detectors for pressure, flow rate, temperature, etc. and a regulator corresponding to the detector. There is a problem that the device becomes expensive and complicated. [0004] In view of this situation, the main problems of the present invention are:
It is an object of the present invention to provide an inexpensive and simple steam deheater capable of reducing superheated steam to a predetermined temperature without using various detectors and control valves. Means for solving the above-mentioned problems According to the present invention, a cooling fluid is supplied to superheated steam flowing down a steam passage, and the superheated steam is cooled to a predetermined temperature. A first liquid storage container for storing a liquid is disposed, and a liquid inlet of the first liquid storage container is communicated with a vapor passage through which superheated steam flows, and The liquid outlet of the first liquid reservoir is communicated with the second liquid reservoir through a communication passage, and is connected to the liquid outlet of the second liquid reservoir via a connection passage with a vapor passage through which superheated steam flows. In addition, the first liquid reservoir and the second liquid reservoir communicate with a high-pressure fluid communication passage communicating with the high-pressure fluid source, and the first liquid reservoir and the high-pressure fluid communication passage communicate with each other between the first liquid reservoir and the high-pressure fluid communication passage. A switching valve that switches between inflow and shutoff of high-pressure fluid into the reservoir It is. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When a high-pressure fluid into a first liquid reservoir is shut off by a switching valve, liquid in a vapor passage passes through a first passage through a communication passage and a liquid inlet. It flows into the reservoir. The liquid that has flowed into and accumulated in the first liquid reservoir is transferred into the second liquid reservoir via the communication path and the liquid outlet when the high-pressure fluid flows into the first liquid reservoir by the switching valve. Inflow. Further, the liquid that has flowed into the second liquid reservoir is supplied to the vapor passage via the connection passage and the liquid outlet by the fluid pressure of the high-pressure fluid, and the temperature of the superheated steam is reduced. 1, a steam pipe 1 as a steam passage through which superheated steam flows, a first liquid reservoir 2 and a second liquid reservoir 3, and a second liquid reservoir 3 And a connection passage 4 for supplying the cooling liquid into the steam pipe 1 from above. A valve 5, an automatic control valve 6, and a gas-liquid mixing separator 7 are sequentially attached to the steam pipe 1, and steam reduced to a predetermined temperature is supplied from a pipe 8 to a steam using device (not shown). The automatic control valve 6 controls the amount, pressure, or temperature of the steam supplied from the pipe 8, and the gas-liquid mixing / separating device 7.
The superheated steam in the steam pipe 1 and the cooling liquid supplied from the connection passage 4 are mixed and further separated, and only the steam separated from the liquid and cooled to a predetermined temperature is supplied to the pipe 8. The steam pipe 1 is branched to communicate with the high-pressure fluid communication passage 9. The high-pressure fluid communication passage 9 is connected to the high-pressure fluid inlet 11 of the first liquid reservoir 2 via a valve 10 and to the upper side of the second liquid reservoir 3 via a valve 12. Although not shown, the high-pressure fluid communication passage 9
The pressure of the high-pressure fluid supplied to the first liquid reservoir 2 and the second liquid reservoir 3 is kept constant by attaching a pressure reducing valve having a function of keeping the pressure on the secondary side constant. be able to. A gas-liquid mixing / separating device 7 is connected to a liquid inlet 13 of the first liquid reservoir 2 via a check valve 14 and a liquid passage 15.
To the lower end of the A vapor trap 16 and a check valve 17 are connected to the lower end of the mixing separator 7. Steam trap 16
Is a type of automatic valve that allows only condensed water as a condensed water of the vapor separated by the gas-liquid mixing separator 7 or the cooling liquid to flow down, and does not cause the vapor to flow down. Check valves 17 and 14
The passage of the fluid from the vapor trap 16 to the liquid inlet 13 is allowed, and the passage of the fluid to the opposite side is not allowed. A high-pressure fluid outlet 18 is provided on the upper side of the first liquid reservoir 2 beside the high-pressure fluid inlet 11 so that the atmosphere communication pipe 1 is provided.
9 is connected. A liquid outlet 20 is provided below the liquid inlet 13 of the first liquid reservoir 2, and communicates with the second liquid reservoir 3 through a communication passage 21. A check valve 22 is attached to the communication passage 21. The check valve 22 allows the fluid to pass from the liquid outlet 20 to the second liquid reservoir 3 side, but does not allow the fluid to pass to the opposite side. The first liquid storage container 2 raises an internal float (not shown) when a liquid such as condensate flowing in from the liquid inlet 13 accumulates therein and the liquid level rises, and when the liquid reaches a predetermined position, it snaps. Moving to open the pressure delivery valve attached to the high pressure fluid inlet 11 and
The high-pressure fluid communication passage 9 supplies high-pressure vapor to the inside of the first liquid reservoir 2, and the accumulated liquid is discharged from the liquid outlet 20 to the check valve 22 and the communication passage 21.
Through the second liquid reservoir 3. As the liquid in the first liquid reservoir 2 flows down to the second liquid reservoir 3, the float (not shown) inside descends and snaps when it drops to a predetermined liquid level. The high-pressure fluid inlet 11 is closed, the high-pressure fluid outlet 18 is opened, and the high-pressure steam in the first liquid reservoir 2 is discharged from the atmosphere communication pipe 19 to the outside.
Again, liquid such as condensate flows into the first liquid reservoir 2 from the liquid passage 15. In the present embodiment, a pressure-feeding valve attached to the high-pressure fluid inlet 11 and an exhaust valve attached to the high-pressure fluid outlet 18 switch between inflow and cutoff of the high-pressure fluid into the first liquid reservoir 2. Configure the valve. A cooling liquid supply pipe 23 is connected between the two check valves 14 and 17 in the liquid passage 15. An automatic valve 24 is attached to the cooling liquid supply pipe 23. When the cooling liquid, for example, the cooling water is insufficient, the cooling liquid can be supplied from the automatic valve 24. The second liquid reservoir 3 communicated with the first liquid reservoir 2 by the communication passage 21 is formed by a closed tank, and the high pressure fluid communication passage 9 is connected to the upper side. Container 3
A liquid level sensor 25 for detecting the liquid level in the container 3
Attach. A connection passage 4 is connected to a lower portion of the container 3. The connection passage 4 is connected to a surplus liquid discharge pipe 27 via an automatic valve 26, and is fitted with an in-line heat exchanger 28. The heat exchanger 28 includes an ejector 29, a heating or cooling fluid supply pipe 30, and an automatic control valve 31 and a check valve 32 attached to the fluid supply pipe 30. A temperature sensor 33 for detecting a liquid temperature in the connection passage 4 is attached to the connection passage 4 on the side of the steam pipe 1. The temperature sensor 33 and the automatic control valve 31 are electrically connected via a temperature controller (not shown). A predetermined amount of heating or cooling fluid is supplied from the heating or cooling fluid supply pipe 30 by adjusting the valve opening of the automatic control valve 31 in accordance with the temperature of the cooling fluid detected by the temperature sensor 33. To the liquid in the steam pipe 1
The temperature of the cooling liquid supplied to the inside can be arbitrarily controlled. When the cooling liquid is supplied from the connection passage 4 into the steam pipe 1, the steam pipe 1
Preferably, a nozzle for injecting the cooling liquid is attached to the inner end. The liquid level sensor 25 attached to the second liquid reservoir 3 is connected to an automatic valve 2 via a controller (not shown).
4, 26 are electrically connected. Depending on the liquid level detected by the liquid level sensor 25, the automatic valve 24 is opened to supply the cooling liquid,
Alternatively, the automatic cooling valve 26 is opened to remove excess cooling liquid out of the system. When the steam passes through the inside of the steam pipe 1 at the time of initial startup, the steam is cooled and condensed, and the steam is condensed.
Flows into the liquid storage container 2. When the liquid level in the container 2 reaches a predetermined height, the pressure-feeding valve attached to the high-pressure fluid inlet 11 opens, and the exhaust valve attached to the high-pressure fluid outlet 18 closes. When the high-pressure steam is supplied into the container 2 and becomes the same pressure as that in the second liquid storage container 3, the liquid in the container 2 naturally flows down into the container 3 due to a difference in head. The inside of the second liquid reservoir 3 is constantly in communication with the high-pressure fluid passage 9, and the liquid in the container 3 is pumped from the connection passage 4 into the steam pipe 1 by the pressure of the high-pressure fluid, so that It is injected into superheated steam flowing down the pipe 1.
The cooling liquid injected into the steam pipe 1 is mixed with the superheated steam in the gas-liquid mixing / separator 7 to lower the temperature of the superheated steam.
In this case, the temperature of the superheated steam to be reduced can be appropriately controlled by adjusting the amount and temperature of the cooling liquid supplied from the connection passage 4. The remaining cooling liquid mixed with the superheated steam in the gas-liquid separator 7 is separated into gas and liquid in the separator 7.
It flows down from the vapor trap 16 at the lower end into the first liquid storage container 2. On the other hand, the vapor at a predetermined temperature from which the liquid is separated,
The water is supplied from the mixing separator 7 through the line 8 to the steam use point. As described above, according to the present invention, the cooling liquid is continuously supplied to the steam pipe through the first liquid storage container and the second liquid storage container, so that the steam is supplied. The superheated steam in the pipe can be reduced to an arbitrary steam temperature, and it is inexpensive and simple without using various sensors such as pressure and flow rate, control valves, or pump means for supplying cooling liquid. It is possible to provide a simple steam desuperheater.

[Brief description of the drawings] FIG. 1 is a configuration diagram showing an embodiment of a steam deheater of the present invention. [Explanation of symbols] 1 steam pipe 2 First liquid reservoir 3 Second liquid reservoir 4 Connection passage 7 Gas-liquid mixing separator 9 High-pressure fluid passage 11 High-pressure fluid inlet 13 Liquid inlet 15 Liquid passage 18 High pressure fluid outlet 19 Atmospheric communication pipe 20 Liquid outlet 21 Connecting passage 23 Cooling liquid supply pipe 25 Liquid level sensor 28 heat exchanger 33 temperature sensor

Claims (1)

Claims: 1. A first liquid for storing a liquid, wherein a cooling fluid is supplied to superheated steam flowing down a steam passage to reduce the temperature of the superheated steam to steam at a predetermined temperature. A reservoir is disposed, the liquid inlet of the first liquid reservoir communicates with a vapor passage through which the superheated steam flows, and the liquid outlet of the first liquid reservoir communicates with the second liquid reservoir. The liquid passage of the second liquid reservoir is connected to the vapor outlet through which the superheated steam flows through the connection passage, and the first liquid reservoir is connected to the liquid outlet of the second liquid reservoir.
The high-pressure fluid communication passage communicating with the high-pressure fluid source communicates with the liquid storage container and the second liquid storage container, and between the first liquid storage container and the high-pressure fluid communication passage, into the first liquid storage container. And a switching valve for switching between inflow and shutoff of the high-pressure fluid.