SU1052890A1 - Device for determining enthalpy of wet steam - Google Patents

Abstract

1. DEVICE FOR DETERMINING WET VAPOR ENTHALPY, Wz omfcfto comprising a mixer mounted in the pipe vyhlopnsal steam turbine configured as a tube, inside .roy koto axially installed nozzle soetsine HPE -paroprovodom through choke with intermediate otbsfom steam turbine, instruments for measuring wet pressure: steam and superheated steam temperature with an throttle and mixer, so that, in order to improve the accuracy of enthalpy determination, an additional nozzle is installed inside the mixer along its axis, first to first, connected to the throttle ds yulnitelny steam pipe of the same form and.

Description

10 2. The device according to p. 1, which is based on the fact that, in order to ensure its adjustment by the average integral humidity of the steam in the exhaust pipe of the turbine, the steam pipes supply a single joint to the mixer MTS seals by mixing the valve in its axis. along the radius of the exhaust pipe, 3. Wo}, according to claim 1, characterized in that, in order to reduce the size of the mixer, inside it, behind the first and second nozzles "and the displacement of the flow turbu-grasers.

The invention relates to physicotechnology and tactics; measurements, and more specifically, instruments for determining the enthalpy of wet napaj, including in the exhaust pipes of condensing turbines.

An exemplary device for determining the enthalpy of wet steam, based on its effect on the adiabatic choke, C – t J.

However, the known device cannot be used to determine the enthalpy of low-pressure wet steam 0 Bi iXJioiiHMX patr-packs of condensation tubes, since it is used to convert low-pressure steam. D ord to 0.04 kgf / cm} to superheated, it is necessary to have a final vapor pressure after throttling on the order of O, 0001. 1 GVC / CM.

The closest to the technical point of view of the present invention is a device for determining the enthalpy of steam in a steam exhaust pipe. t; fbsh1Y5 containing mixer. installed in the exhaust pipe of a flat turbine, expelled in the form of a tube, inside which axis is installed a nozzle connected by a steam line through a choke with an intermediate selection of steam turbig-q devices for measuring the pressure of moisture steam and the temperature of superheated steam behind the choke and the mixer, Moisture and superheated the pairs after the nocTjifaioT throttles into the mixer. As a result of their mixing, a superheated steam is obtained, which is sucked out of the mixer by an ejector of a capacitor. The flow rate of superheated steam, the temperature of the superheated hypha behind the choke and the mixer, and the pressure of the vapor are measured. The enthalpies of the super ret pair are defined by tabl, and the enthalpy of wet steam is according to the level of heat of balance 2 j.

The disadvantage of such a device is the need for tvSDcTb to measure the flow rates of the preheat steam behind the choke and the mixer, which leads to significant

faults in enthalpy measurements.

The purpose of the invention is the accuracy of determining the enthalpy of wet steam.

The goal is achieved by the fact that

in a device for determining the enthalpy of wet steam containing a mixer, installed in the exhaust pipe of a steam turbine and made in the form of a pipe, whose nozzle BHjTpK is installed from the axis, connected by a steam pipe through a choke with intermediate extraction of steam turbine steam behind the choke and mixer, inside the mixer along its axis

an additional nozzle was installed, similar to the first one, connected to the throttle by an additional steam pipe of the same shape and size,

In this case, the steam lines are supplied under-. Hex-msnvfH packing glands () and gland packers that allow the mixer to be moved in axial density along the radius of the exhaust pipe, and flow turbulators, non-lenmer, and blades are placed inside the mixer behind the first and second nozzles.

The drawing shows a diagram of the device “The device includes a steam turbine 1, throttle 2, temperature sensor 3, movable couplings 4, stuffing box seals 5, steam lines 6, mixer 7, nozzles 8, turbulators 9, gears 10 those shells, diffuser 11, pressure sensor 12. 31 Nozzles 8 are installed along the axis of the mixer 7, placed in the exhaust pipe of the steam turbine 1, and connected by means of the windings 6 through the throttle 2 to the selection of the turbine 1. The steam pipelines 6 have moving sleeves 4 and in the places of passage through the turbine housing 1 have gland seals 5. Inside the mixer 7, the first and second nozzles 8 are mounted along the steam line by the turbulators 9 of the flow. A temperature sensor 3 steam is installed in choke 2, and the other two sensors U are in mixer 7 after the first and second turbulators 9. Pressure sensor 12 located in the exhaust pipe of turbine 1. A device for determining the enthalpy of low-pressure wet steam works as follows. A portion of the moisture vapor from the exhaust manifold of the steam turbine 1 enters the mixer 7. High-pressure steam from the turbine take-off enters the throttle 2, throttled to a pressure equal to the pressure of wet steam in the turbine exhaust manifold. The temperature of the superheated steam behind the choke is measured by temperature sensor 3. The overheated bore is fed through steam lines 6 to the calibrated nozzles 8. Behind the nozzles, there is an intensive mixing of steam flows through the mixing tube and flowing out of the nozzles. This is facilitated by turbulizers 9. After each mixing, a stream of n & reheated steam is obtained, uniform in temperature and pressure. The temperatures of these streams are measured by temperature sensors 10. In the diffuser 11 at the outlet of the mixer, the flow of superheated steam slows down and its static pressure rises. Selection of replaceable nasa90 4 DOC diffuser ensures that the velocity field of wet steam at the entrance to the mixer and in the cross section of the turbine nozzle is equipped where the mixer is installed - obtaining representative selection of wet steam (average integral humidity) entering the mixer, improving the accuracy of determining the value of wet steam displacement of the mixer perpendicular to the flow of wet steam in the exhaust pipe by means of movable sleeves 4 and oil seals 5. Pressure sensor 12 i tf wet steam pressure. Using the table of steam or by approximating expressions, the enthalpies of superheated steam are determined. The enthalpy of moisture vapor entering the mixer is determined by the formula -rjg L. ..5 (the enthalpy of superheated steam after throttles; H 2 from the actual enthalpy of steam after the first and second mixes; steam supplied from the selection turbine. The proposed device does not require the measurement of steam flow rates, which improves the accuracy of determining the enthalpy of wet steam and facilitates automation of this process.

Claims (3)

1. DEVICE FOR DETERMINING THE ENTHALPY OF WET VAPOR, th ο / ηδορο containing a mixer installed in the exhaust pipe of a steam turbine and made in the form of a pipe, inside of which an nozzle is connected along the axis, connected by a steam line through a throttle with an intermediate selection of a steam turbine, instruments for measuring wet pressure : steam and temperature of superheated steam behind the throttle and mixer, characterized in that, in order to increase the accuracy of determining the enthalpy, an additional nozzle is installed inside the mixer along its axis, similar to tear. connected to the choke by an additional steam pipe of the same shape and size. 2. The device according to π. 1, characterized in that, in order to ensure its adjustment according to the average integral humidity of the steam in the exhaust pipe of the turbine, the steam pipelines are equipped with movable couplings and stuffing box seals, which allow the mixer to mix in the axial plane along the radius of the exhaust pipe, 3. The device pop. 1, characterized in that, in order to reduce the size of the mixer, flow turbulators are placed inside it behind the first and second nozzles.