JP3836710B2 - Steam desuperheater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam temperature reducing device that can reduce so-called superheated steam having a temperature equal to or higher than a saturation temperature to a predetermined temperature, for example, a saturation temperature.
[0002]
[Prior art]
As a conventional steam temperature reducing device, for example, a device disclosed in Japanese Patent Application Laid-Open No. 62-141407 has been used. This is because the pressure control valve, pressure detector, steam flow rate detector, temperature detector, and water flow rate detector supplied to the superheated steam are respectively attached to the superheated steam piping, and the pressure of the superheated steam is detected. By adjusting the control valve and 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 detector, the superheated steam can be reduced to the saturated temperature steam. Is.
[0003]
[Problems to be solved by the invention]
The conventional steam temperature reducing device requires a pressure control valve, various detectors such as pressure, flow rate, and temperature, and a controller corresponding to the detector, and the temperature reducing device becomes an expensive and complicated object. was there.
[0004]
In view of this situation, the main problem of the present invention is to obtain an inexpensive and simple steam temperature reducing device that can reduce the temperature of superheated steam to steam at a predetermined temperature without using various detectors and control valves. It is.
[0005]
[Means for Solving the Problems]
The means of the present invention devised to solve the above problem is to supply a cooling fluid to superheated steam flowing down the steam passage and reduce the temperature of the superheated steam to steam at a predetermined temperature state. A first liquid storage container is disposed, the liquid inlet of the first liquid storage container is communicated with a vapor passage through which superheated steam flows and a communication passage, and the liquid outlet of the first liquid storage container is connected to the second liquid storage container. The liquid reservoir of the second liquid reservoir is connected to the liquid outlet of the second liquid reservoir via a connection passage to a vapor passage through which superheated steam flows, and the first liquid reservoir and the second liquid reservoir The high-pressure fluid communication passage communicating with the high-pressure fluid source is communicated with the liquid reservoir, and the flow of high-pressure fluid into the first liquid reservoir is blocked between the first liquid reservoir and the high-pressure fluid communication passage. A switching valve for switching is attached.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
When the high pressure fluid into the first liquid reservoir is blocked by the switching valve, the liquid in the vapor passage flows into the first liquid reservoir via the communication passage and the liquid inlet. When the high-pressure fluid flows into the first liquid storage container by the switching valve, the liquid that has flowed into the first liquid storage container flows into the second liquid storage container via the communication path and the liquid outlet. Inflow. Furthermore, 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 superheated steam is reduced in temperature.
[0007]
【Example】
In FIG. 1, a steam pipe 1 as a steam passage through which superheated steam flows, a first liquid storage container 2, a second liquid storage container 3, and cooling from the second liquid storage container 3 into the steam pipe 1. A vapor temperature reducing device is constituted by the connection passage 4 for supplying the liquid.
[0008]
A valve 5, an automatic control valve 6, and a gas / liquid mixing / separating device 7 are sequentially attached to the steam pipe 1, and steam reduced to a predetermined temperature from the pipe 8 is supplied to a steam using device (not shown). The automatic control valve 6 adjusts the amount or pressure or temperature of the steam supplied from the pipe 8, and the gas-liquid mixing separator 7 is cooled by the superheated steam in the steam pipe 1 and the connection passage 4. The liquid is mixed and further separated, and only the vapor which has been separated into the pipe 8 and reduced in temperature to a predetermined temperature is supplied.
[0009]
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 the valve 10 and is connected to the upper side of the second liquid reservoir 3 via the valve 12. Although not shown in the drawings, the first liquid reservoir 2 and the second liquid reservoir are attached to the high-pressure fluid communication passage 9 by attaching a pressure reducing valve having a function of maintaining the pressure on the secondary side constant. The pressure of the high-pressure fluid supplied to the container 3 can be kept constant.
[0010]
The liquid inlet 13 of the first liquid reservoir 2 is connected to the lower end of the gas-liquid mixing separator 7 via a check valve 14 and a liquid passage 15. A steam trap 16 and a check valve 17 are connected to the lower end of the mixing separator 7. The steam trap 16 is a kind of automatic valve that causes only condensate or cooling liquid as condensed water of steam separated by the gas-liquid mixing separator 7 to flow down, and does not cause steam to flow down. The check valves 17 and 14 allow the passage of fluid from the vapor trap 16 to the liquid inlet 13 side and do not allow the passage of fluid to the opposite side.
[0011]
A high-pressure fluid outlet 18 is provided on the side of the high-pressure fluid inlet 11 at the top of the first liquid reservoir 2 to connect the atmosphere communication pipe 19. 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 the communication path 21. A check valve 22 is attached to the communication path 21. The check valve 22 allows passage of fluid from the liquid outlet 20 to the second liquid reservoir 3 side and does not allow passage of the fluid to the opposite side.
[0012]
The first liquid reservoir 2 raises a float (not shown) when a liquid such as condensate flowing in from the liquid inlet 13 accumulates therein and the liquid level rises, and snaps when it reaches a predetermined position. The pressure feed valve attached to the high-pressure fluid inlet 11 is opened, and the exhaust valve attached to the high-pressure fluid outlet 18 is closed, so that high-pressure vapor is fed into the first liquid reservoir 2 from the high-pressure fluid communication passage 9. The supplied and accumulated liquid flows down from the liquid outlet 20 to the second liquid reservoir 3 through the check valve 22 and the communication passage 21.
[0013]
As the liquid in the first liquid reservoir 2 flows down to the second liquid reservoir 3, the float (not shown) in the interior descends, and when it reaches a predetermined liquid level, it snaps and moves to the high pressure fluid inlet. 11 and the exhaust valve of the high-pressure fluid outlet 18 are opened, so that the high-pressure vapor in the first liquid reservoir 2 is discharged to the outside from the atmosphere communication pipe 19 and again the liquid passage 15 The liquid such as condensate flows into the first liquid reservoir 2.
[0014]
In this embodiment, a switching valve that switches between inflow and shutoff of the high-pressure fluid into the first liquid reservoir 2 is constituted by a pressure-feed valve attached to the high-pressure fluid inlet 11 and an exhaust valve attached to the high-pressure fluid outlet 18. To do.
[0015]
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 automatic valve 24 can replenish.
[0016]
The second liquid reservoir 3 communicated with the first liquid reservoir 2 by the communication passage 21 is formed of a sealed tank, and the high-pressure fluid communication passage 9 is connected to the upper side. A liquid level sensor 25 for detecting the liquid level in the container 3 is attached to the upper part of the container 3. A connection passage 4 is connected to the lower part of the container 3.
[0017]
An excess liquid discharge pipe 27 is connected to the connection passage 4 via an automatic valve 26, and an inline heat exchanger 28 is attached. The heat exchanger 28 includes an ejector 29, a heating or cooling fluid supply pipe 30, and an automatic adjustment valve 31 and a check valve 32 attached to the fluid supply pipe 30. A temperature sensor 33 for detecting the liquid temperature in the connection passage 4 is attached to the connection passage 4 on the steam pipe 1 side. The temperature sensor 33 and the automatic control valve 31 are electrically connected via a temperature controller (not shown).
[0018]
A predetermined amount of heating or cooling fluid is supplied from the heating or cooling fluid supply pipe 30 to the liquid in the connection passage 4 by adjusting the valve opening of the automatic adjustment valve 31 according to the cooling liquid temperature detected by the temperature sensor 33. The cooling liquid temperature supplied to the steam pipe 1 can be arbitrarily controlled. When supplying the cooling liquid from the connection passage 4 into the vapor pipe 1, it is preferable to attach a nozzle for injecting the cooling liquid to the inner end of the vapor pipe 1 of the connection passage 4, although not shown.
[0019]
The liquid level sensor 25 attached to the second liquid reservoir 3 is electrically connected to the automatic valves 24 and 26 via a controller (not shown). Depending on the liquid level detected by the liquid level sensor 25, the automatic valve 24 is opened to replenish the cooling liquid, or the automatic valve 26 is opened to remove excess cooling liquid from the system.
[0020]
When the steam passes through the steam pipe 1 at the initial startup, the steam is cooled to become condensate, and passes through the gas / liquid mixing separator 7, the steam trap 16, and the check valves 17 and 14, and the first liquid reservoir 2. Flows in. When the liquid level in the container 2 reaches a predetermined height, the pressure feed valve attached to the high pressure fluid inlet 11 is opened, and the exhaust valve attached to the high pressure fluid outlet 18 is closed, so that the high pressure fluid communication passage 9 closes. The high-pressure steam is supplied into the container 2 and becomes the same pressure as that in the second liquid reservoir 3, so that the liquid in the container 2 naturally flows into the container 3 due to a water head difference.
[0021]
The inside of the second liquid reservoir 3 is constantly in communication with the high-pressure fluid passage 9. Therefore, 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, and the inside of the steam pipe 1. It is injected into superheated steam flowing down. The cooling liquid injected into the steam pipe 1 is mixed with 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 lowered can be appropriately controlled by adjusting the amount of the cooling liquid supplied from the connection passage 4 or the temperature.
[0022]
The remaining cooling liquid mixed with superheated steam in the gas-liquid mixing separator 7 is gas-liquid separated in the mixing separator 7 and flows down into the first liquid reservoir 2 from the vapor trap 16 at the lower end. On the other hand, the vapor at a predetermined temperature from which the liquid has been separated is supplied from the mixing / separating device 7 through the pipe 8 to the vapor use location.
[0023]
【The invention's effect】
As described above, according to the present invention, the cooling liquid is continuously supplied to the steam pipe via the first liquid reservoir and the second liquid reservoir, so that the superheated steam in the steam pipe can be changed to any steam. It is possible to reduce the temperature to a temperature, and to make an inexpensive and simple steam temperature reducing device without using various detectors such as pressure and flow rate, control valves, or pump means for supplying cooling liquid. Can do.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a steam temperature reducing apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steam pipe 2 1st liquid storage container 3 2nd liquid storage container 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 Communication path 23 Cooling liquid supply pipe 25 Liquid level sensor 28 Heat exchanger 33 Temperature sensor

Claims (1)

A cooling fluid is supplied to the superheated steam flowing down the steam passage to reduce the temperature of the superheated steam to a steam in a predetermined temperature state, and a first liquid storage container for storing the liquid is disposed, and the first The liquid inlet of the liquid reservoir is communicated with a vapor passage through which superheated steam flows and the communication passage, the liquid outlet of the first liquid reservoir is communicated with the second liquid reservoir, and the second A high-pressure fluid communication path communicating with the high-pressure fluid source is connected to the first liquid storage container and the second liquid storage container while being connected to the liquid outlet of the liquid storage container via the connection passage through the connection passage. A steam temperature reducing device, wherein a switching valve for switching between inflow and shutoff of the high pressure fluid into the first liquid reservoir is attached between the first liquid reservoir and the high pressure fluid communication path.

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