JPH08285216A - Steam temperature control device - Google Patents

Abstract

PURPOSE: To obtain steam temperature control device to control the temperature of reduced pressure steam to a desired value. CONSTITUTION: A steam feed pipe 2 is connected to the primary side of a control valve 1 and a reducted pressure steam pipe 3 is connected to the secondary side. A motor 17 is connected to the control valve 1. A drive control part 6 is provided to control drive of the motor 17. A temperature sensor 5 is attached to the reducted pressure steam pipe 3 and a heat-exchanger 4 is connected. A heating fluid pipe 25 and a cooling fluid pipe 26 are connected to the heat- exchanger 4 through valves 27 and 28. Sensors 5, 30, and 31 and valves 27, 28, and 32 are connected to the drive control part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam temperature control device for reducing the steam pressure to a predetermined value and maintaining the steam temperature at a desired temperature and supplying the steam temperature to various steam using devices. When the object to be heated is heated by various steam using devices by the steam generated in the boiler, it is common practice to adjust the pressure or temperature of the steam to a predetermined value before supplying the steam.

[0002]

2. Description of the Related Art As a conventional one for adjusting the steam pressure and temperature, for example, one disclosed in JP-A-6-94211 has been used. This is a cooling water supply valve provided on the secondary side of the pressure reducing valve that has a motor and a control unit, so that the steam decompressed by the pressure reducing valve and superheated can be cooled to the saturation temperature and supplied. Is.

[0003]

In the above-mentioned prior art, the superheated steam can be adjusted by reducing the temperature to saturated steam, but on the contrary, it may be heated to saturated steam, or depending on the application, saturated steam may be used. There is a problem that the application is limited because it cannot be further heated to form superheated steam.

Usually, when the pressure of the steam is reduced by the pressure reducing valve, the pressure reducing steam is apt to become superheated steam. However, the superheated steam is generated when there is almost no heat radiation in the pressure reducing valve. When there is more heat released from the chamber depending on the atmospheric conditions, or when the pressure reducing ratio of the pressure reducing valve is relatively small, it does not become superheated steam but becomes wet steam.

Therefore, a technical object of the present invention is to make it possible to adjust not only the temperature of the depressurized steam but also the temperature thereof, depending on the intended use.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is a control valve connected to a steam source, and the control valve is provided on one surface of a pressure responsive member. It consists of a pressure reducing valve that receives the fluid pressure on the secondary side and receives the elastic force of the elastic member on the other surface to open and close the main valve through which the steam flows down by the displacement of the pressure responsive member, and the elastic force of the elastic member is adjusted to the pressure reducing valve. The elastic force adjusting means is attached, a storage unit for storing the relationship between the elastic force of the elastic member and the set pressure and the set temperature is provided, and the set temperature input means for inputting the set temperature is provided, and the set temperature input means is provided. In addition to providing a drive control unit that drives the elastic force adjusting unit by a desired amount from the relationship between the input value and the storage unit, a temperature detecting unit and a steam heating / cooling unit are arranged on the secondary side of the control valve. is there.

[0007]

The operation of the above technical means is as follows.
By adjusting the elastic member by the elastic force adjusting means, the elastic force applied to the pressure responsive member changes, and the secondary side pressure is automatically adjusted so as to balance with the elastic force. The function reduces the valve secondary pressure to a predetermined value.

The saturated steam has a one-to-one relationship between its pressure and temperature, and when the steam pressure is determined, the steam temperature is automatically determined. Therefore, when the set temperature of the pressure reducing valve is input by the set temperature input means, the elastic force is calculated to reach the set temperature from the set temperature in the storage unit, that is, the relationship between the pressure and the elastic force of the elastic member. Then, the elastic force adjusting means is driven to generate the elastic force, the pressure reducing valve is set, and the steam temperature on the secondary side is maintained at the set temperature.

When the steam pressure and the temperature are not in a predetermined relationship due to the atmospheric conditions and the pressure reduction ratio in which the pressure reducing valve is installed, the steam temperature is detected by the temperature detecting means arranged on the secondary side to obtain the desired steam temperature. By driving the steam heating / cooling means so that, the reduced pressure steam can be saturated steam or superheated steam.

[0010]

EXAMPLES Examples showing specific examples of the above technical means will be described. 1, a control valve 1, a steam pipe 2 connecting a steam source (not shown) to the control valve 1, a reduced pressure steam pipe 3, a steam heating / cooling unit 4, a temperature detecting unit 5, and a drive control unit 6 Configure the control device.

The control valve 1 is a main valve 8 that cuts off the passage of steam.
A piston 9 that cooperates with the main valve 8, a pilot valve portion 11 that shuts off supply of high-pressure steam on the primary side to an upper chamber 10 of the piston 9, and a diaphragm 12 as a pressure responsive member that drives the pilot valve portion 11. , A secondary pressure introducing passage 14 for introducing a secondary side fluid pressure into the lower chamber 13 of the diaphragm 12.
A coil spring 15 as an elastic member acting on the upper surface of the diaphragm 12, an adjusting screw 16 as an elastic force adjusting means for adjusting the elastic force of the coil spring 15, and an adjusting screw 1
A motor 17 and a speed reducer 18 as a drive unit for driving the motor 6.
It consists of and.

The drive control unit 6 has a built-in storage unit (not shown) for storing the relationship between the set pressure of the control valve 1 and the elastic force of the coil spring 15 and the relationship between the pressure of saturated steam and the temperature. The drive control unit 6 also incorporates a set temperature input means. Although the set temperature input means is not shown in the figure, any means can be used as long as it can input an arbitrary value by a ten key or the like.

In the present embodiment, the coil spring 15 as an elastic member has shown an example in which the elastic force acts in the downward direction of the diaphragm 12, but when the pressure of so-called vacuum vapor below atmospheric pressure is reduced, the elastic force is reduced. It is also possible to use a coil spring that acts in the opposite direction, that is, in the upward direction.

The control valve 1 has a separator 20 for separating condensate as condensed water contained in the high-pressure steam supplied from the steam supply pipe 2, and the condensate thus separated causes the condensate to float and descend. A steam trap portion 23 composed of a float 22 for opening and closing the valve opening 21 is integrally attached.

A temperature sensor 5 as a temperature detecting means is attached to the reduced pressure steam pipe 3 and a heat exchanger 4 as a steam heating / cooling means is connected. The reduced pressure steam pipe 3 spirally passes through the inside of the heat exchanger 4 and communicates with the outlet pipe 7. The outlet pipe 7 is connected to various steam using devices (not shown). A heating fluid pipe 25 and a cooling fluid pipe 26 are provided in the heat exchanger 4 by valves 27,
Attached via 28, and heating / cooling fluid discharge pipe 2 on top
Attach 9.

A temperature sensor 30 and a pressure sensor 31 are attached to the outlet pipe 7. The sensors 5, 30, 31 are connected to the drive controller 6, and the motor 17 of the control valve 1
Also, the valves 27, 28, 32 are also connected to the drive control unit 6.

Next, the operation will be described. When the secondary side of the control valve 1 is controlled to a desired temperature, when the set temperature is input from the set temperature input means in the drive control unit 6, the relationship between the steam pressure and the set temperature in the storage unit in the drive control unit 6 is related. , And the elastic force of the coil spring 15 with respect to the steam temperature is calculated from the relationship between the steam pressure and the elastic force of the coil spring 15, and the elastic force of the coil spring 15 is adjusted, whereby the control valve 1
Is supplied to the secondary side, that is, the reduced pressure steam pipe 3, from the steam of the desired temperature.

The temperature of the steam supplied to the reduced pressure steam pipe 3 is detected by the temperature sensor 5, and the signal thereof is sent to the drive controller 6. When the temperature and pressure of the steam are not in a desired relationship, the drive control unit 6 issues a signal to open / close the respective valves 27, 28 or 32, and the heat exchanger 4
By heating or cooling the reduced pressure steam at 1, the reduced pressure steam can be changed to a desired saturation temperature steam or a superheated steam.

[0019]

EFFECTS OF THE INVENTION It is possible to heat or cool depressurized steam, and it is possible to control the steam temperature according to the intended use of various steams.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional configuration diagram of an embodiment of a steam temperature control device of the present invention.

[Explanation of symbols]

 1 Control Valve 2 Steam Supply Pipe 3 Decompression Steam Pipe 4 Heat Exchanger 5 Temperature Sensor 6 Drive Control Section 8 Main Valve 12 Diaphragm 15 Coil Spring 16 Adjusting Screw 17 Motor 25 Heating Fluid Pipe 26 Cooling Fluid Pipe

Claims (1)

[Claims] 1. A control valve connected to a steam source, and the control valve receives a secondary side fluid pressure on one surface of a pressure responsive member and receives elastic force of an elastic member on the other surface to displace the pressure responsive member. A pressure reducing valve for opening and closing a main valve through which steam flows by means of which an elastic force adjusting means for adjusting the elastic force of the elastic member is attached to the pressure reducing valve to store the relationship between the elastic force of the elastic member and the set pressure and set temperature. And a set temperature input means for inputting the set temperature, and a drive control section for driving the elastic force adjusting means by a desired amount from the relationship between the input value from the set temperature input means and the inside of the storage section. A steam temperature control device characterized in that a temperature detecting means and a steam heating / cooling means are arranged on the secondary side of the control valve.