Method of determining dryness of stream of wet steam

FIELD: physics.

SUBSTANCE: method of determining dryness of wet steam involves measuring pressure in a controlled stream of steam. A steam sample is then collected from the controlled stream, the collected sample is throttled into a flow chamber and calculations are carried out based on the measured parameters. The collected steam sample flows from the first flow chamber into a second flow chamber. Both chambers are placed in the controlled stream of steam or other heating medium. Pressure and temperature is measured in each chamber. After the second chamber, flow rate, pressure and temperature of the collected sample is measured. The value of flow rate is then established based on parameters measured in the first chamber.

EFFECT: determining dryness of a stream of wet steam without condensing the collected sample.

1 dwg

 

The technical field to which the invention relates.

The invention relates to the technical physics, namely to the field of determining the degree of dryness and other thermodynamic parameters of wet steam can be used to determine the degree of dryness, as at the sites of production and consumption of saturated and wet steam.

The level of technology

Analogue of the invention is a method, comprising: measuring pressure in a controlled steam flow, sampling from the monitored stream, heating the sample up to a complete evaporation of the liquid phase, overheating of the heated samples, the condensation of the hot samples, measurement of temperature and energy on heating until complete evaporation of the liquid phase, the temperature measurement and energy to overheating, the calculation on measured parameters. [Patent of Russia, having got no 1772705. The method of determining the degree of dryness of wet steam].

With essential features of the invention match the following set of features analog: "measurement of pressure in a controlled steam flow, sampling from the monitored flow, calculation of the measured parameters.

The disadvantages are the counterpart.

A. the Need to measure energy for heating selected samples of wet steam until complete evaporation of its liquid phase;

B. the Need for energy measurement on overheating take samples from humid the CSOs steam heated until complete evaporation of its liquid phase;

C. Condensation of the hot sample pair.

The prototype of the invention is a method, comprising: measuring pressure in a controlled steam flow, sampling from the monitored flow, throttling selected sample in a flow cell with a volume of water, the condensation of the selected sample pair in the volume of water, flow measurement and temperature of the running water before and after the camera, the calculation on measured parameters. (Patent RF №2380694, the Method of controlling the degree of dryness of wet steam).

With essential features of the invention match the following set of features of the prototype: "measurement of pressure in a controlled steam flow, sampling from the monitored flow, throttling selected sample in a flow chamber, the calculation of the measured parameters.

The disadvantages of the prototype are

A. Condensation take samples of wet steam.

The invention

The challenge which seeks the invention is a method of determining the degree of dryness of wet steam.

During implementation of the invention can be obtained the following technical result

A. determination of the degree of dryness of the flow of wet steam without condensation take samples.

This technical result is achieved because:

"measure the pressure in a controlled steam flow, select a sample pair of the counter is controlled stream, drossellied selected sample in a flow chamber, calculated using measured parameters;

the sample pair of the first flow chamber is supplied to the second flow chamber; both cameras are placed in a controlled flow of steam or other heating medium in each chamber to measure the pressure and temperature after the second camera measure the flow rate, pressure and temperature of the selected samples; set the amount of flow parameters measured in the first chamber".

The distinctive characteristics from the closest analogue, expressed by the following combination of characteristics:

"the sample pair of the first flow chamber is supplied to the second flow chamber; both cameras are placed in a controlled flow of steam or other heating medium in each chamber to measure the pressure and temperature after the second camera measure the flow rate, pressure and temperature of the selected samples; set the amount of flow parameters measured in the first chamber".

Thus, the objective of the invention is resolved.

List of figures

Figure 1 shows the diagram of a device for implementing the method of determining the degree of dryness of wet steam".

Information confirming the possibility of carrying out the invention

Figure 1. shows a diagram of a device for implementing the method of determining the degree of dryness of wet steam". Echostruct contains:

- steam 1 pressure sensor 2;

node sampling pair with the orifice 9 in the line selection;

camera 10 with gauges 3 and temperature 4;

- the camera 11 with the pressure gauges 12 and temperature 14;

the flow meter selected sample pair 7, with pressure gauge 6 and a temperature meter 5;

the valve 8 to control the flow of selected samples;

computer 15 connected with the outputs of all of the probes.

The operation of the device is as follows. Regulating valve 8 set flow rate selected samples, in which the camera 10 is installed steam temperature which is not higher than the temperature of the saturating vapor. Then, produce a small increase in consumption. Monitor compliance with the temperature in the chamber 10, the temperature of the saturating vapor. When this condition in the chamber 10 there is complete evaporation of the liquid phase. That is, in the camera 10 saturated steam.

Saturated steam from the chamber 10 into the chamber 11, where there is a significant overheating.

From the chamber 11 hot sample pair comes in line with the temperature measurement 5, pressure 6 and flow 7.

During the experiment, registered the following values of measured parameters:

- Pressure in the steam line, (Rcouples=12,4 MPa);

- Pressure in the chamber 10, (R10=1.4 MPa);

The temperature in the chamber 10, ( 10=200°C);

- Pressure in the chamber 11, (P11=1,3 5 MPa);

The temperature in the chamber 11, (t11=290°C);

- Flow in-line flow meter sample pair (G7=0.06 kg/s).

Set the flow rate in the sampling line with the condition that the camera 10 has been saturated steam (or insignificant superheated steam).

In the chamber 11 will be obtained substantially superheated steam.

Cameras 10 and 11 are identical, the external conditions for these cameras are identical, through the chambers are of equal mass selected sample of wet steam.

In the camera 10 evaporation; on the entrance - two phase (steam) - output single phase [saturated steam (or insignificant superheated steam)].

In the chamber 11 overheating - input and single-phase output stream.

Of steam into the chamber 10 enters the wet steam:

Gsamples=G"+G'=0.06 kg/s;

where Gsamplesthe flow of wet steam from the steam in the chamber 10;

G - flow steam phase in a selected sample of wet steam;

G' is the flow rate of the liquid phase in the selected sample of wet steam.

From the chamber 10 into the chamber 11 receives saturated steam:

Gn=0.06 kg/s;

where Gn- consumption of saturated steam from the chamber 10 into the chamber 11.

From the chamber 11 in the line of site of consumption is supplied superheated steam:

Cn=0.06 kg/s;

where Gnthe flow of superheated steam from the chamber 11 to the node of the control flow.

The difference of heat flow is and the outlet and the inlet chamber 11 determines the heat flow to the sample vapor coming through the walls of the chamber 11 from the heating medium, encased camera, for example, the controlled flow of wet steam in the steam line.

ΔQ11=Gn·in-Gn·in=0,06*(719,5-668,4)=3,066 kcal/sec;

where Q11- heat flow from the heating medium into the chamber 11;

inthe enthalpy of saturated steam from the chamber 10;

inthe enthalpy of superheated steam from the chamber 11.

Heat flow from the heating medium in the camera 10 (Q10several more of the heat flow from the heating medium into the chamber 11 (Q11) mainly due to various values of the temperature differences inside the chambers and the heating medium, such as steam.

It follows from the identity of the material and the geometry of the chambers of the identity of external conditions (e.g. temperature wet steam in the steam line corresponds to the pressure to complete its condensation), as well as from the fact that the temperature of saturated steam in the chamber 10 below the temperature of superheated steam in the chamber 11.

That is: ΔQ10=k·ΔQ11=1,2042*3,066=3,692 kcal/sec

where k is the compliance rate of heat flow Q10and Q11.

This coefficient can be determined from the following equation:

k=ηt11t10=1,0290,0200,0 =1,2042;

where η is experimentally determined correction. In calculating taken η=1,0.

Heat flux with a sample of wet steam from the steam in the chamber 10

Qsamples=Gn·in-ΔQ10=0,06*668,4-3,692=36,412 kcal/sec;

where Qsamples- heat flux with a sample of wet steam from the steam in the chamber 10. The flow rate of the vapor phase in taken from the steam sample:

G"=Qppaboutbs-Gppaboutbsi'(i''-i')=(36,412-0,06*348,4)/(648,7-348,4)=15,508/300,3=0,0516Kg/with a;

where i is the enthalpy of the vapor phase in a controlled flow of wet steam;

i' - enthalpy of the liquid phase in a controlled flow of wet steam.

The degree of dryness (x) wet steam in the steam line:

x=G''Gppthe bs0,0516/0,06=0,86.

The method of determining the degree of dryness of wet steam, comprising: measuring pressure in a controlled steam flow, sampling a pair of controlled flow, throttling selected sample in a flow chamber, a calculation on the measured parameters; characterized in that the sample pair of the first flow chamber is supplied to the second flow chamber; both cameras are placed in a controlled flow of steam or other heating medium in each chamber to measure the pressure and temperature after the second camera measure the flow rate, pressure and temperature of the selected samples; set the amount of flow parameters measured in the first chamber.



 

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