JPH0498306A - Pressure reducer and attemperator valve - Google Patents

Abstract

PURPOSE:To efficiently reduce the temperature and pressure of steam with a simplified and inexpensive mechanism by connecting the primary side of a cooling water filling port in a valve means for cooling water to a cooling water passage and connecting a secondary side to the primary side of a pressure reducing valve part. CONSTITUTION:Since pressure on the primary side and the secondary side of the pressure reducing valve part 50 is guided to both sides of a pressure response member 53 through plural guide passages 51 and 52, the pressure response member 53 moves in accordance with a pressure difference between the primary side and secondary side of the pressure reducing valve part 50. The movement of the pressure response member 53 is transmitted to the valve means for cooling water 54 and the amount of cooling water supplied to the primary side of the pressure reducing valve part 50 changes. Steam in the pressure reducing valve is apt to become heating steam as the pressure reducing rate, namely, a pressure difference between the primary side and the secondary side is larger. Thus, heating steam can efficiently by attemperated by filling much amount of cooling water when the pressure difference between the primary side and the secondary side is large and filling small amount of cooling water in accordance with the small pressure difference when the pressure difference is small. Thus, the temperature and pressure of steam can inexpensively be reduced with the simplified mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steam temperature and pressure reducing valve used for temperature and pressure reduction of steam to a temperature and pressure suitable for usage conditions.

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 by a pressure reducing valve at the end 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 it is depressurized, making it difficult to adjust the amount of heat transferred in steam-using equipment, and making uniform heat transfer impossible.

Prior Art Conventionally, a device was used in which a device was attached to the secondary side of a pressure reducing valve to directly spray pressurized spray water from a spray nozzle onto superheated steam and reduce the temperature to a predetermined temperature. This is done by placing a spray nozzle in the superheated steam passage on the secondary side of the pressure reducing valve, and installing a temperature sensor 6 on the downstream side, and responding to the temperature detected by the temperature sensor so that the superheated steam reaches a predetermined temperature. If the steam temperature drops too low, adjust the opening of the control valve by tightening the control valve and reducing the amount of water sprayed from the spray nozzle to recover the steam temperature. , the opening of the control valve is increased to increase the amount of spray water to reduce the steam temperature.

Problems to be Solved by the Present Invention The above problems include a temperature detector that detects the temperature of the reduced steam, a drive unit that adjusts the opening degree of a control valve according to the detected temperature, and a drive unit that A connection part was required to connect the temperature sensor and the control valve, and the cost of equipment and installation often increased.

Therefore, the technical problem of the present invention is to efficiently reduce the temperature and pressure of steam using a simple and inexpensive mechanism.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems includes a pressure reducing valve part whose main valve opens and closes in response to fluid pressure on the secondary side, and the pressure reducing valve. A plurality of introduction passages are formed to introduce the pressure on the primary side and the secondary side of the part to both sides of the pressure responsive member, and a cooling water valve means is arranged to open and close the cooling water inlet in cooperation with the pressure responsive member. , the primary side of the cooling water inlet is connected to the cooling water passage, and the secondary side of the cooling water inlet is connected to the primary side of the pressure reducing valve section.

action The operation of the above technical means is as follows.

The pressure on the primary and secondary sides of the pressure reducing valve is introduced to both sides of the pressure responsive member through multiple introduction channels, so that the pressure responsive member responds to the pressure difference between the primary and secondary sides of the pressure reducing valve. Displace accordingly. The displacement of the pressure responsive member is transmitted to the cooling water valve means, and by displacing the cooling water valve means, the amount of cooling water supplied to the primary side of the pressure reducing valve section changes. In a pressure reducing valve, the steam to be reduced in pressure becomes more likely to become superheated steam as the pressure reduction ratio, that is, the pressure difference between the primary side and the secondary side increases. Therefore, if the pressure difference between the primary and secondary sides of the pressure reducing valve is large, a large amount of cooling water can be injected, and if the pressure difference is small, a small amount of cooling water can be injected accordingly. superheated steam is efficiently cooled down.

Effects of the Invention A temperature detector, a drive unit for a control valve, etc. are not required, and the temperature and pressure of steam can be reduced and reduced at low cost with a simplified mechanism.

By automatically adjusting the amount of cooling water injected according to the pressure reduction ratio in the pressure reduction valve section, the temperature of superheated steam can be reduced efficiently.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

Pressure-responsive members 53, such as the pressure-reducing valve section 50, a plurality of introduction passages 51 and 52 that respectively introduce the pressure on the primary and secondary sides of the pressure-reduction valve section 50, and a pressure-responsive member 53 that communicates with the introduction passages 51 and 52. a cooling water valve means 54 cooperating with the cooling water inlet 55 , a cooling water passage 56 , and a cooling water injection passage connecting the secondary side of the cooling water inlet 55 and the primary side of the pressure reducing valve section 50 . 5
7 constitutes a steam detemperature & pressure valve.

The pressure reducing valve section 50 is formed by a high pressure steam port 1, a main valve 2, a reduced pressure steam outlet 3, a diaphragm 4 for detecting secondary side pressure, a pilot valve section 5, and a piston section 6. At the bottom of the main valve 2, a hero 7 is attached with the entire circumference fixed by welding,
The main valve 2 is provided with a through hole 9 facing the valve seat surface 8. The inside of the bellows 7 is connected to a cooling water injection passage 57 via a communication hole 11 provided in the plug 10. When the pressure on the outlet 3 side of the pressure reducing valve section 50 drops below a set value, the diaphragm 4 bends, the pilot valve section 5 opens, the piston section 6 is pushed down, and the main valve 2 also opens. 8-pressure steam from the side is supplied to the outlet 3 side. When the pressure on the outlet 3 side, that is, the secondary side, reaches the set pressure, the tires 7 and rams 4 return to the normal state, the pilot valve 5 closes, the supply of high pressure steam to the piston 6 is cut off, and the main valve 2 closes. speak.

The high-pressure steam pipe 12 is thus branched to connect the primary side pressure introduction path 51 of the pressure reducing valve section 50 to one end side of the pressure responsive member 53. The pressure responsive member 53 is formed in the shape of a piston, and the other end thereof is connected to the secondary pressure introduction path 52 of the pressure reducing valve portion 50 .

The cooling water valve means 54 is attached to the pressure responsive member 53, and the cooling water valve means 54 is moved in the valve-closing direction (the biasing coil spring 20 is arranged).The displacement of the coil spring 0, that is, the spring force is adjusted from the outside. T-th spring force adjustment screw (
(not shown) can also be attached.

A cooling water inlet 55 is provided opposite to the cooling water valve means 54, and the primary side of the cooling water inlet 55 is connected to a cooling water passage 56.
The secondary side is connected to the communication hole 11 of the pressure reducing valve section 50 and the inside of the bellows 7 via a cooling water injection passage 57.

When reducing the temperature of superheated steam to, for example, saturated steam, the amount of cooling water to be injected can be determined by its pressure reduction ratio. Now 1 C) Kl/ crtr steam is 2 Kg/
When reducing the pressure using the pressure reducing valve section 50 up to cui, 10KI/c
The enthalpy of steam at trr is 664 Kcal/Ky, and the enthalpy of steam at 2 Kg/cm is 651 Kc.
Assuming that there is no heat loss since al/ is 3, the difference between the two is 13 Kcal/! All you have to do is inject enough cooling water to absorb the heat from j. Therefore,
A cooling water inlet 55 is installed to supply that much cooling water.
By adjusting the spring force of the coil spring 20 and the cooling water pressure in the cooling water passage 56, the through hole 91 is opened only when the main valve 2 is opened. Cooling water can be injected through the tank to reduce the temperature of superheated steam to saturated steam. Furthermore, even if the pressure on the primary side or the pressure on the secondary side of the pressure reducing valve changes for some reason, the pressure responsive member 53 will be displaced and the opening degree of the cooling water inlet 55 will change accordingly. , the amount of cooling water is changed to maintain the steam temperature on the secondary side of the pressure reducing valve at a predetermined level.

Since cooling water is supplied only when main valve 2 is opened,
The supply of cooling water is not excessive, and the temperature of the superheated steam can be reduced more appropriately.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional configuration diagram of an embodiment of the steam '1A Far pressure reducing valve of the present invention. 1: High pressure steam inlet 2: Main valve 3: Reduced pressure steam outlet 4: Diaphragm 7: Bellows 9: Through hole

Claims (1)

[Claims] 1. Forming a pressure reducing valve section whose main valve opens and closes in response to fluid pressure on the secondary side, and a plurality of introduction channels that introduce pressure on the primary side and secondary side of the pressure reducing valve section to both sides of the pressure responsive member. a cooling water valve means for opening and closing the cooling water inlet in cooperation with the pressure responsive member, and connecting the primary side of the cooling water inlet to the cooling water passage;
A steam temperature reducing pressure reducing valve in which the secondary side of the cooling water inlet is connected to the primary side of the pressure reducing valve section.