Rotary machine system

Abstract

A rotary machine system includes: a rotary machine including a gas seal portion; a gas seal device connected to the rotary machine and that supplies a seal gas to the gas seal portion; a pressure sensor that detects a pressure of the seal gas; a vent portion that discharges the seal gas discharged from the gas seal portion; and a vent pressure sensor that detects a pressure in the vent portion. The rotary machine includes: a casing through which a working fluid flows; a rotatable rotary shaft that passes; and the gas seal portion provided between the casing and the rotary shaft and that seals the working fluid by the seal gas having a pressure higher than a pressure of the working fluid in the casing. The gas seal device includes: a pressure regulating valve; and a control part that controls the pressure regulating valve.

What is claimed is: 
     
       1. A rotary machine system comprising:
 a rotary machine comprising a gas seal portion; 
 a gas seal device connected to the rotary machine and that supplies a seal gas to the gas seal portion; 
 a pressure sensor that detects a pressure of the seal gas; 
 a vent portion that discharges the seal gas discharged from the gas seal portion to the outside; and 
 a vent pressure sensor that detects a pressure in the vent portion, 
 wherein the rotary machine comprises:
 a casing through which a working fluid flows; 
 a rotatable rotary shaft that passes through an inside and an outside of the casing; and 
 the gas seal portion provided between the casing and the rotary shaft and that seals the working fluid by the seal gas having a pressure higher than a pressure of the working fluid in the casing, 
 
 the gas seal device comprises:
 a pressure regulating valve that adjusts the pressure of the seal gas supplied to the gas seal portion; and 
 a control part that controls the pressure regulating valve, 
 
 the pressure sensor is provided closer to the gas seal portion side than the gas seal device, 
 pressure variations occurs in the vent portion, and 
 the control part controls the pressure regulating valve according to the pressure of the seal gas detected by the pressure sensor and controls the pressure regulating valve so that the pressure of the seal gas detected by the pressure sensor is higher than the pressure in the vent portion detected by the vent pressure sensor. 
 
     
     
       2. The rotary machine system according to  claim 1 , wherein the pressure sensor is provided in a connection pipe portion which connects the gas seal portion and the gas seal device. 
     
     
       3. The rotary machine system according to  claim 2 , wherein the pressure sensor is provided in the connection pipe portion within a range of 1/3 of an overall length of the connection pipe portion from the gas seal portion side. 
     
     
       4. The rotary machine system according to  claim 2 , wherein the connection pipe portion comprises:
 a connection hole portion provided at a position of the casing which faces the gas seal portion, and 
 one or more connecting pipes that connects the connection hole portion and the gas seal device, and 
 the pressure sensor is provided in the connection hole portion. 
 
     
     
       5. The rotary machine system according to  claim 1 , wherein the pressure sensor is provided in an opening of the casing which faces the gas seal portion. 
     
     
       6. The rotary machine system according to  claim 1 , further comprising an internal pressure sensor that detects an internal pressure of the machine closer to an inside of the rotary machine than the gas seal portion,
 wherein the control part controls the pressure regulating valve so that a pressure of the seal gas detected by the pressure sensor is higher than the internal pressure of the machine detected by the internal pressure sensor.