JPH0252905A - Temperature reducing device for super heated steam - Google Patents

Abstract

PURPOSE:To reduce the temperature of super heated steam to convert it to saturated steam by taking an excessive calorific amount over that of saturated steam away as kinetic energy from super heated steam having a larger enthalpy than saturation steam at the same pressure. CONSTITUTION:Super heated steam having a larger enthalpy than saturated steam holds a part of enthalpy as kinetic energy when it flow along a pipeline. Super heated steam flows into a casing 6 through an inlet 2, and collides against a impeller 8 to revolve it. The impeller 8 acts as a rotational resistance by means of magnetic elements 28 and 34 that are connected to a shaft 10, that means super heated steam performs work on the impeller 8. As a result, super heated steam loses a part of its enthalpy and becomes saturated steam when it leaves an outlet 4. That is, an excessive calorific amount of super heated steam over that of saturated stem is converted to kinetic energy and absorbed, and the temperature drops to a saturated steam temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a steam desalination device used for reducing the salt content of superheated steam.

Generally, steam is generated as relatively high-pressure steam in a steam generation source such as a boiler, and is used after being reduced in pressure at the inlet side of various steam-using equipment depending on the purpose of use of the steam-using equipment. Due to its nature, high-pressure steam becomes superheated steam when its pressure is reduced, making it difficult to adjust the amount of heat transferred in steam-using equipment, and making uniform heat transfer impossible.

<Prior Art> In general, salt reduction of superheated steam by this type of salt reduction apparatus is carried out by injecting cooling water into the flow of superheated steam and absorbing the thermal energy key of the superheated steam by the latent heat of the cooling water.

Therefore, conventionally, as shown in FIG. 2, pressurized spray water is passed through a spray water pipe 50 to a spray nozzle 52.
A device was used that sprayed salt directly onto superheated steam to reduce salt content to a predetermined temperature. This is done by arranging the spray nozzle 52 on the upstream side in the superheated steam passage 54 and providing a temperature detector 56 on the downstream side, so that the superheated steam reaches a predetermined temperature in response to the temperature detected by the temperature detector 56. to adjust the opening degree of the control valve 58. In other words, the deviation between the steam temperature set value and the detected temperature is determined, the amount of spray from the spray nozzle 52 is determined by the PID controller so as to reduce this deviation to zero, and the control valve 58 is operated to adjust the steam temperature. It is something to control.

Problems to be Solved by the Present Invention> The above device includes a temperature detector that detects the temperature of reduced-salt steam, a control valve that adjusts the opening degree according to the detected temperature, and the temperature sensor and the control valve. In addition, the temperature sensor had to be installed separately in the steam passage, and the control valve had to be installed in the spray water passage, respectively, resulting in increased equipment and construction costs. In addition, there was also the hassle of having to install piping for spray water to the point of use.

In addition, the control becomes complicated, and determining the PID constant is difficult and requires experience.

The technical problem of the present invention is to efficiently reduce the salt content of superheated steam using a simple device and without requiring complicated control.

Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems is that an impeller is arranged in a casing having an inlet and an outlet, and an end of a shaft supporting the impeller is installed. A resistor is attached to mechanically apply a load to the This resistor allows the magnitude of the mechanical load to be adjusted as desired.

Effect: Even at the same pressure, superheated steam has a higher enthalpy than saturated steam, and by depriving the excess heat relative to saturated steam as kinetic energy, the salt content is reduced to saturated steam.

In other words, the superheated steam that flows in from the inlet of the casing converts part of its enthalpy into kinetic energy, which rotates the impeller and rotates the resistor that provides a mechanical load on the impeller shaft. I do the work. Therefore, by rotating the impeller, a part of the enthalpy of the superheated steam is absorbed and the salt content of the superheated steam is reduced to saturated steam.

<Example> An example showing a specific example of the above technical means will be described (see FIG. 1).

An impeller 8 is located within the casing 6 forming the inlet 2 and outlet 4.
Place. A shaft 10 supporting the impeller is passed through the center of the impeller 8, and its end is inserted into the casing 6.
It penetrates to the back part 6a of.

The case 14 is fixed to the back surface 6a of the casing 6 with the heat insulating material 12 interposed therebetween using bolts 16a and b. At this time, the annular protrusion 18 provided at the center of the shaft 10 is connected to the thrust ring 20 disposed between the back surface 6a and the case 14.
．． Insert with 22. Member number 24 is a sealing member, and 26 is a sleeve.

The case 14 has a cylindrical shape, and a magnetic body 28 is attached to the end of the shaft 10 protruding from the bottom thereof with a nut 30.

A male thread is formed on the upper part of the case 14, and the female thread of the adjuster 32 is screwed to match the male thread. regulator 32
A magnetic body 34 is arranged at the bottom of the inner surface of the body and is secured with bolts 36a and b. The magnetic body 34 is placed to face the magnetic body 28, and the distance between the two magnetic bodies is changed by rotating the threaded portion of the adjuster 32 and the case 14. That is, the smaller the distance between the magnetic bodies when the impeller 8 rotates, the greater the rotational resistance becomes, and the greater the distance, the smaller the resistance becomes.

The action is as follows. Superheated steam, which has a larger enthalpy than saturated steam, retains a part of its enthalpy as kinetic energy when flowing through the pipe, and the superheated steam that flows in from the inlet 2 of the casing 6 flows into the impeller 8.
Rotate it.

Since the impeller 8 has rotational resistance due to the magnetic material 26, 34 connected to the shaft 10, the superheated steam has done work on the impeller 8, and when it flows out from the outlet 4, a part of its enthalpy is taken away. It becomes saturated steam. That is, the excess heat of superheated steam relative to saturated steam is converted into kinetic energy and absorbed to reduce the salt content to the saturated steam temperature.

Then, depending on the degree of superheating, the distance between the magnetic bodies 34 and 28 can be adjusted by rotating the regulator 32, thereby changing the rotational resistance of the impeller 8, and as a result, the amount of work applied to the impeller can be changed. Further, once the adjustment is completed, the number of rotations of the impeller 8 increases or decreases depending on the flow rate of the passing superheated steam, and the amount of energy taken can be automatically controlled.

Although it is possible that pressure loss of the steam may occur due to the resistance of the impeller 8, there is no need to worry about this because the pressure drop can be compensated for by the excess heat of the superheated steam.

Unique effects〉 The present invention produces the following unique effects.

Traditionally, salt was reduced by absorbing thermal energy from superheated steam, which required spray water and
Controlling the amount of water used to be complicated, but since this application absorbs kinetic energy, there is no need for spray water, and there is no need for expensive pressure detectors, control valves, or connection lines between the two, making it a simplified device. Steam temperature can be reduced in salt at low cost.

10: Axis 28°

Claims (1)

[Claims] 1. A superheated steam desalination device characterized in that an impeller is disposed within a casing having an inlet and an outlet, and a resistor for mechanically applying a load is attached to the end of a shaft that supports the impeller.