CN103901068B - The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value - Google Patents

Abstract

The present invention relates to the on-line monitoring method of a kind of exhaust enthalpy of low pressure cylinder of steam turbine value, including gathering required unit real-time running data；The transmission data received are recompiled；Draw the hydrophobic enthalpy of low-pressure heater group, and result of calculation is sent to exhaust enthalpy of low pressure cylinder of steam turbine value computing module and data storage server；Draw exhaust enthalpy of low pressure cylinder of steam turbine value, and result of calculation is sent to system main display and data storage server；Data storage server completes classification and the storage of data；System main display presents exhaust enthalpy of low pressure cylinder of steam turbine value and history run cleanliness factor with the form of form and curve simultaneously.The present invention is by calculating steam turbine important operation monitoring parameter, exhaust enthalpy of low pressure cylinder of steam turbine value in real time, and presents to operations staff with the form of chart and history curve, helps operations staff to grasp steam turbine real-time running state.

Description

On-line Monitoring Method of Exhaust Enthalpy of Low Pressure Cylinder of Steam Turbine

technical field

The invention belongs to the technical field of thermal power generation and energy saving, in particular to an online monitoring method for the exhaust steam enthalpy value of a steam turbine low-pressure cylinder.

Background technique

The exhaust steam of the low-pressure cylinder of the steam turbine is in the wet steam area, and its enthalpy value cannot be calculated by measuring the temperature and pressure of the exhaust steam of the low-pressure cylinder according to the conventional calculation method, and there are currently no relatively mature methods and instruments that can be applied to the engineering field for testing Wet steam humidity, but the exhaust enthalpy of the low-pressure cylinder of the steam turbine is an important parameter in the operation of the steam turbine, which has a great influence on the operating economy of the unit.

Contents of the invention

The object of the present invention is to propose an online monitoring method for the enthalpy value of the exhaust steam of the low-pressure cylinder of the steam turbine aiming at the deficiencies of the prior art.

The present invention solves its technical problem and realizes by taking the following technical solutions:

A method for on-line monitoring of exhaust steam enthalpy in a low-pressure cylinder of a steam turbine, the method steps comprising:

(1) The unit operation data acquisition module collects the required unit real-time operation data from the server of the distributed control system of the operating unit, and sends the real-time operation data to the real-time data acquisition network;

(2) The real-time data acquisition network recodes the received transmission data, isolates the connection with other external data transmission networks, and sends the recoding results to the low-pressure heater group drain enthalpy calculation module and the steam turbine low-pressure cylinder exhaust steam enthalpy calculation module and data storage servers;

(3) The low-pressure heater group drainage enthalpy value calculation module calculates the water inlet enthalpy value H _din of the heater group, the water outlet enthalpy value H _dout of the heater group, and the extraction steam enthalpy values H ₁ to H _n of the first to n stages from the received data, and then obtains Calculate the drain enthalpy value of the low-pressure heater group, and send the calculation result to the exhaust steam enthalpy calculation module and data storage server of the steam turbine low-pressure cylinder;

⑷The steam turbine low-pressure cylinder exhaust steam enthalpy calculation module calculates the circulating cooling water inlet H _in , the circulating cooling water outlet H _out , and the condensate enthalpy value H _w from the received data, and then obtains the steam turbine low-pressure cylinder exhaust steam enthalpy, and calculates The results are sent to the main display screen and data storage server of the online monitoring system for exhaust steam enthalpy of the low-pressure cylinder of the steam turbine;

⑸The data storage server simultaneously receives data from the real-time data acquisition network, the low-pressure heater group drainage enthalpy calculation module and the steam turbine low-pressure cylinder exhaust steam enthalpy calculation module, and completes the data classification and storage for users to analyze historical data call and subsequent processing;

⑹ The main display screen of the on-line monitoring system for the exhaust steam enthalpy of the low-pressure cylinder of the steam turbine simultaneously presents the exhaust enthalpy of the low-pressure cylinder of the steam turbine and the cleaning coefficient of historical operation in the form of tables and curves.

Moreover, the real-time operation data of the unit in the step (1) specifically includes: condenser pressure, condenser hot well water temperature, circulating cooling water inlet pressure and temperature, circulating cooling water outlet pressure and temperature, heater group Inlet water pressure, temperature and flow, outlet water pressure and temperature of the heater group, extraction pressure, temperature and flow of the first to n sections.

Moreover, the recoding of the received transmission data in the step (2) is to convert the received condenser pressure, condenser hot well water temperature, circulating cooling water inlet pressure and temperature, circulating cooling water outlet pressure and Temperature, heater group inlet water pressure, temperature and flow, heater group outlet water pressure and temperature, first to n segment extraction pressure, temperature and flow transmission data are recombined with time data packets and encoded in П hexadecimal data.

Moreover, the specific calculation method for the hydrophobic enthalpy of the low-pressure heater group in the step (3) is:

①Inlet water pressure P _din , temperature T _din , flow Q _d of the heater group; heater outlet water pressure P _dout , T _dout ; extraction pressure P _n , temperature T _n , and flow Q _n of the first to n stages are DCS systems The real-time monitoring quantity is collected by the real-time operation data acquisition module of the unit;

② For saturated steam, superheated steam, saturated water, and supercooled water, the enthalpy value in the corresponding state can be calculated from the pressure and temperature according to the "International Formulary Committee 1967 Industrial IFC Equation", using the formula H=f(P,T) Indicates that H _din , H _dout , H ₁ to H _n can be calculated sequentially;

③ The specific calculation method for the hydrophobic enthalpy value H _s of the low-pressure heater group is:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; do\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; din</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; .</span>$

Moreover, the specific calculation method for the exhaust enthalpy value of the steam turbine low-pressure cylinder in the step (4) is:

①Condenser pressure P ₀ , condenser hot well water temperature T ₀ ; circulating cooling water inlet pressure P _in , temperature T _in , flow Q; circulating cooling water outlet pressure P _out and T _out are real-time monitoring by DCS system The quantity is collected by the real-time operation data acquisition module of the unit;

②According to the "International Formulation Committee's 1967 Industrial IFC Equation", the enthalpy value in the corresponding state is calculated from the pressure and temperature, expressed by the formula H=f(P, T), and H _in , H _out , Condensed water enthalpy value H _w ;

③ The specific calculation method for the exhaust enthalpy value H ₀ of the low-pressure cylinder of the steam turbine is:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; in</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; .</span>$

Moreover, the specific classification method of the data classification in the step (5) is:

①Data is divided into unit real-time operation data and calculation result data, of which the unit real-time operation data includes: condenser pressure, condenser hot well water temperature, condenser circulating cooling water inlet/return water pressure, temperature flow, heater Group inlet/outlet water pressure, temperature, flow unit vacuum, pressure, temperature and flow of steam extraction in each section; calculation result data include: low-pressure heater group drain enthalpy, steam turbine low-pressure cylinder exhaust enthalpy;

②Since the real-time operation data of the unit is collected from the distributed control system (DCS) server of the operating unit, it will no longer be saved in this data storage server, and only the calculation result data will be stored synchronously with the data packets at the same time.

Moreover, the table in the step (6) specifically includes condenser pressure, condenser hot well water temperature, condenser circulating cooling water inlet/return water pressure, temperature and flow rate, low-pressure heater group drain enthalpy . The enthalpy value of the exhaust steam of the low-pressure cylinder of the steam turbine, the curve specifically includes the curve of the enthalpy value of the exhaust steam of the low-pressure cylinder of the steam turbine changing with time.

Advantage and positive effect of the present invention are:

The present invention integrates the real-time operation data acquisition module of the unit, the real-time data acquisition network, the low-pressure heater group drainage enthalpy calculation module, the data storage server, the steam turbine low-pressure cylinder exhaust steam enthalpy calculation module and the steam turbine low-pressure cylinder exhaust steam enthalpy online monitoring system. The screens are connected together to form an online monitoring system for the exhaust enthalpy of the low-pressure cylinder of the steam turbine. The system calculates the important operation monitoring parameters of the steam turbine in real time: the exhaust enthalpy value of the low-pressure cylinder of the steam turbine, and presents it to the operating personnel in the form of charts and historical curves, helping the operating personnel to grasp the real-time operating status of the steam turbine.

Description of drawings

Fig. 1 is the schematic diagram of the calculation method principle of steam turbine low-pressure cylinder exhaust steam enthalpy value of the present invention;

Fig. 2 is a schematic diagram of the system connection of the online monitoring method for the exhaust steam enthalpy of the low-pressure cylinder of the steam turbine according to the present invention.

detailed description

The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

An online monitoring method for the exhaust steam enthalpy value of the low-pressure cylinder of a steam turbine. The principle of the method is shown in Figure 1, and the system connection is shown in Figure 2. The hardware system used in this method includes: a real-time operation data acquisition module of the unit, a real-time data acquisition network, Low-pressure heater group drainage enthalpy calculation module, data storage server, steam turbine low-pressure cylinder exhaust steam enthalpy calculation module, steam turbine low-pressure cylinder exhaust steam enthalpy online monitoring system main display screen and operating unit distributed control system (DCS) server, the method The steps are as follows:

(1) The unit operation data acquisition module collects the required real-time operation data of the unit from the distributed control system (DCS) server of the operating unit, and sends the real-time operation data to the real-time data acquisition network;

Among them, the real-time operation data of the unit include: condenser pressure, condenser hot well water temperature, circulating cooling water inlet pressure and temperature, circulating cooling water outlet pressure and temperature, heater group inlet water pressure, temperature and flow rate, Water outlet pressure and temperature of the heater group, extraction pressure, temperature and flow rate of the first to n stages;

(2) The real-time data acquisition network recodes the received transmission data, isolates the connection with other external data transmission networks, and sends the recoding results to the low-pressure heater group drain enthalpy calculation module and the steam turbine low-pressure cylinder exhaust steam enthalpy calculation module and data storage servers;

Among them, recoding the received transmission data is to convert the received condenser pressure, condenser hot well water temperature, circulating cooling water inlet pressure and temperature, circulating cooling water outlet water pressure and temperature, heater group inlet water pressure , temperature and flow, outlet water pressure and temperature of the heater group, extraction pressure, temperature and flow transmission data of the 1st to n sections are recombined with the time data packet and П hexadecimal data encoding;

(3) The low-pressure heater group drainage enthalpy value calculation module calculates the water inlet enthalpy value H _din of the heater group, the water outlet enthalpy value H _dout of the heater group, and the extraction enthalpy values H ₁ to H _n of the first to n stages from the received data, and then obtains Calculate the drain enthalpy value of the low-pressure heater group, and send the calculation result to the exhaust steam enthalpy calculation module and data storage server of the steam turbine low-pressure cylinder;

Among them, the specific calculation method for the hydrophobic enthalpy of the low-pressure heater group is:

①Inlet water pressure P _din , temperature T _din , flow Q _d of the heater group; heater outlet water pressure P _dout , T _dout ; extraction pressure P _n , temperature T _n , and flow Q _n of the first to n stages are DCS systems The real-time monitoring quantity is collected by the real-time operation data acquisition module of the unit;

② For saturated steam, superheated steam, saturated water, and supercooled water, the enthalpy value in the corresponding state can be calculated from the pressure and temperature according to the "International Formulary Committee 1967 Industrial IFC Equation", using the formula H=f(P,T) Indicates that H _din , H _dout , H ₁ to H _n can be calculated sequentially;

③ The specific calculation method for the hydrophobic enthalpy value H _s of the low-pressure heater group is:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; do\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; din</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}$

⑷The steam turbine low-pressure cylinder exhaust steam enthalpy calculation module calculates the circulating cooling water inlet H _in , the circulating cooling water outlet H _out , and the condensate enthalpy value H _w from the received data, and then obtains the steam turbine low-pressure cylinder exhaust steam enthalpy, and calculates The results are sent to the main display screen and data storage server of the online monitoring system for the exhaust enthalpy of the low-pressure cylinder of the steam turbine,

Among them, the specific calculation method of the exhaust steam enthalpy value of the low-pressure cylinder of the steam turbine is:

①Condenser pressure P ₀ , condenser hot well water temperature T ₀ ; circulating cooling water inlet pressure P _in , temperature T _in , flow Q; circulating cooling water outlet pressure P _out and T _out are real-time monitoring by DCS system The quantity is collected by the real-time operation data acquisition module of the unit;

②According to the "International Formulation Committee's 1967 Industrial IFC Equation", the enthalpy value in the corresponding state is calculated from the pressure and temperature, expressed by the formula H=f(P, T), and H _in , H _out , Condensed water enthalpy value H _w ;

③ The specific calculation method for the exhaust enthalpy value H ₀ of the low-pressure cylinder of the steam turbine is:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; in</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}$

⑸The data storage server simultaneously receives data from the real-time data acquisition network, the low-pressure heater group drainage enthalpy calculation module and the steam turbine low-pressure cylinder exhaust steam enthalpy calculation module, and completes the data classification and storage for users to analyze historical data call and subsequent processing;

Wherein, the specific classification method of the data classification is:

①Data is divided into unit real-time operation data and calculation result data, of which the unit real-time operation data includes: condenser pressure, condenser hot well water temperature, condenser circulating cooling water inlet/return water pressure, temperature flow, heater Group inlet/outlet water pressure, temperature, flow unit vacuum, pressure, temperature and flow of steam extraction in each section; calculation result data include: low-pressure heater group drain enthalpy, steam turbine low-pressure cylinder exhaust enthalpy;

②Since the real-time operation data of the unit is collected from the distributed control system (DCS) server of the operating unit, it will no longer be saved in this data storage server, and only the calculation result data will be stored synchronously at the same time as the data packet;

⑹ The main display screen of the on-line monitoring system for the exhaust enthalpy of the low-pressure cylinder of the steam turbine simultaneously presents the exhaust enthalpy of the low-pressure cylinder of the steam turbine and the cleaning coefficient of historical operation in the form of tables and curves;

Wherein, the table specifically includes condenser pressure, condenser hot well water temperature, condenser circulating cooling water inlet/return water pressure, temperature and flow rate, low-pressure heater group drain enthalpy, steam turbine low-pressure cylinder exhaust steam enthalpy value,

Wherein, the curve specifically includes the curve of the exhaust steam enthalpy of the low-pressure cylinder of the steam turbine changing with time.

Claims (7)

1. an on-line monitoring method for exhaust enthalpy of low pressure cylinder of steam turbine value, the method step includes:

(1) data unit operation acquisition module unit real-time running data needed for operating unit scattered control system collection of server, And real-time running data is sent to real-time data acquisition net；It is characterized in that the method step may further comprise:

(2) the transmission data received are recompiled by real-time data acquisition net, isolation and the connection of other data transmission network outside System, and result transmission will be recompiled to low-pressure heater group hydrophobic enthalpy computing module, the calculating of exhaust enthalpy of low pressure cylinder of steam turbine value Module and data storage server；

(3) low-pressure heater group hydrophobic enthalpy computing module calculates heater group water inlet enthalpy H to receiving data_din, heater group water outlet Enthalpy H_dout, 1 to n section draws gas enthalpy H₁To H_n, and then draw the hydrophobic enthalpy of low-pressure heater group, and result of calculation is sent out Deliver to exhaust enthalpy of low pressure cylinder of steam turbine value computing module and data storage server；

(4) exhaust enthalpy of low pressure cylinder of steam turbine value computing module calculates recirculated cooling water water inlet H to receiving data_in, recirculated cooling water water outlet H_out, condense water enthalpy H_w, and then draw exhaust enthalpy of low pressure cylinder of steam turbine value, and result of calculation is sent to turbine low pressure cylinder row Vapour enthalpy on-line monitoring system main display and data storage server；

Data storage server receive simultaneously come from real-time data acquisition net, low-pressure heater group hydrophobic enthalpy computing module and The data of exhaust enthalpy of low pressure cylinder of steam turbine value computing module, and complete classification and the storage of data, for user of service to history number According to transfer and subsequent treatment；

(6) to present steam turbine with the form of form and curve low simultaneously for exhaust enthalpy of low pressure cylinder of steam turbine value on-line monitoring system main display Cylinder pressure steam discharge enthalpy and history run cleanliness factor.

The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value the most according to claim 1, it is characterised in that: described step Suddenly the unit real-time running data in (1) specifically includes: condenser pressure, condenser hotwell coolant-temperature gage, recirculated cooling water are intake Pressure and temperature, recirculated cooling water discharge pressure and temperature, heater group intake pressure, temperature and flow, heater group water outlet Pressure and temperature, 1 to n section extraction pressure, temperature and flow.

The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value the most according to claim 1, it is characterised in that: described step Suddenly reception is transmitted data and recompiles in (2) is by the condenser pressure of reception, condenser hotwell coolant-temperature gage, follows Ring cooling water intake pressure and temperature, recirculated cooling water discharge pressure and temperature, heater group intake pressure, temperature and flow, Heater group discharge pressure and temperature, 1 to n section extraction pressure, temperature and flow transmission data are entered with time data bag again Row combination П binary data coding.

The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value the most according to claim 1, it is characterised in that: described step Suddenly the circular of the hydrophobic enthalpy of low-pressure heater group in (3) is:

1. heater group intake pressure P_din, temperature T_din, flow Q_d；Heater discharge pressure P_dout、T_dout；1 to n section is taken out Steam pressure P_n, temperature T_n, flow Q_nIt is the real-time monitoring variable of DCS system, unit real-time running data acquisition module gathers；

2. for saturated vapor, superheated steam, saturation water, subcooled water all in accordance with " international formulation committee 1967 is industrial IFC equation " enthalpy that is calculated under corresponding states by pressure and temperature, represent with formula H=f (P, T), calculate the most successively Go out H_din、H_dout、H₁To H_n；

3. low-pressure heater group hydrophobic enthalpy H_sCircular be:

$H_s=\frac{Q_d\&CenterDot;(H_{dout}-H_{din})-\underset{i=1}{\overset{i=n}{\&Sigma;}}{Q}_i\&CenterDot;H_i}{\underset{i=1}{\overset{i=n}{\&Sigma;}}{Q}_i}.$

The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value the most according to claim 1, it is characterised in that: described step Suddenly the circular of the exhaust enthalpy of low pressure cylinder of steam turbine value in (4) is:

1. condenser pressure P₀, condenser hotwell coolant-temperature gage T₀；Recirculated cooling water intake pressure P_in, temperature T_in, flow Q；Follow Ring cooling water discharge pressure P_out、T_outIt is the real-time monitoring variable of DCS system, unit real-time running data acquisition module gathers；

2. it is calculated under corresponding states by pressure and temperature according to " international formulation committee industrial IFC equation in 1967 " Enthalpy, with formula H=f (P, T) represent, H can be calculated accordingly successively_in、H_out, condense water enthalpy H_w；

3. exhaust enthalpy of low pressure cylinder of steam turbine value H₀Circular be:

$H_0=\frac{Q\&CenterDot;(H_{out}-H_{in})+H_w\&CenterDot;Q_d-\underset{i=1}{\overset{i=n}{\&Sigma;}}{Q}_i\&CenterDot;H_s}{Q_d-\underset{i=1}{\overset{i=n}{\&Sigma;}}{Q}_i}.$

The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value the most according to claim 1, it is characterised in that: described step Suddenly the concrete sorting technique of the classification of data described in (5) is:

1. data are divided into unit real-time running data and calculation result data, and wherein unit real-time running data includes: condenser pressure Power, condenser hotwell coolant-temperature gage, condenser recirculated cooling water enter/pressure of return water, temperature flow, heater group inlet/outlet pressure, Temperature, flow unit vacuum, each section of pressure drawn gas, temperature and flow；Calculation result data includes: low-pressure heater group is dredged Water enthalpy, exhaust enthalpy of low pressure cylinder of steam turbine value；

2. self-operating unit scattered control system (DCS) server is gathered due to unit real-time running data, at notebook data storage clothes Business device no longer preserves, only completes calculation result data and store with time packet synchronisation.

The on-line monitoring method of exhaust enthalpy of low pressure cylinder of steam turbine value the most according to claim 1, it is characterised in that: described step Suddenly form described in (6) specifically includes condenser pressure, condenser hotwell coolant-temperature gage, condenser recirculated cooling water enter/backwater pressure Power, temperature and flow, the hydrophobic enthalpy of low-pressure heater group, exhaust enthalpy of low pressure cylinder of steam turbine value, described curve specifically includes steamer The machine low pressure (LP) cylinder time dependent curve of steam discharge enthalpy.