CN203502056U - Reheated steam flow calculation device of thermal power unit - Google Patents

Abstract

The utility model provides a reheated steam flow calculation device of a thermal power unit. The reheated steam flow calculation device of the thermal power unit comprises a main steam flow module, a main steam flow loss calculation module and a reheated steam flow calculation module, wherein the main steam flow module is used for acquiring the main steam flow value of the thermal power unit and transmitting the value to the reheated steam flow calculation module; the main steam flow loss calculation module is used for calculating all flow loss values of the main steam flow in the process of doing work in a cylinder and transmitting the values to the reheated steam flow calculation module; the reheated steam flow calculation module is used for calculating a reheated steam flow value according to the received main steam flow value and the flow loss values of the main steam flow in the process of doing work in the cylinder. The reheated steam flow calculation device of the thermal power unit not only can be used for obtaining the accurate reheated steam flow value, but also can be used for obtaining branch flow values of the main steam in the process of doing work in the cylinder.

Description

A kind of fired power generating unit reheated steam flow computing device

Technical field

The utility model relates to thermal power generating technology field, refers to especially a kind of fired power generating unit reheated steam flow computing device.

Background technology

In the design of heat power plant boiler and steam turbine, reheated steam flow is a very important design load, according to this design load and other design parameter, can calculate design thermal efficiency or the Power Plant Design net coal consumption rate of full factory.In production run and statistical computation, also need to show in real time reheated steam flow, thereby operations staff could adjust heat temperature more effectively, calculate boiler efficiency, steam turbine hear rate and unit efficiency, and contrast unit design efficiency with this, make heat-economy evaluation, also can find out the deficiency that unit exists simultaneously, then improved.

At present, when boiler efficiency, steam turbine hear rate, net coal consumption rate and unit efficiency are calculated by most of electricity power enterprises, normal employing according to main steam flow through estimating the reheated steam flow of coming, thereby can not really reflect operating states of the units and variation, cannot embody unit physical presence problem, also just cannot carry out specific aim and improve.In this evaluation method, reheated steam flow is a certain hundred ratios (designing heat flux/design main steam flow * 100% again) for main steam flow, its value only changes with main steam flow, fail to embody the main steam every loss of working substance in acting process and energy loss of forming thus in cylinder, size and impact that cannot the every loss of working substance of comparative analysis, can not take correspondingly technical improvements for influence factor, be therefore have certain circumscribed.

In sum, need a kind of calculation element of reheated steam flow, for obtaining the value of reheated steam flow accurately, also can accurately obtain the value of main steam every shunt volume in acting process in cylinder simultaneously.

Utility model content

The utility model provides a kind of fired power generating unit reheated steam flow computing device, for solving prior art, can accurately not obtain the problem of reheated steam flow value and the main steam every shunt volume in acting process in cylinder.The calculation element of the reheated steam flow that the utility model provides, can not only obtain reheated steam flow accurately, and can get main steam every shunt volume in acting process in cylinder, thereby for analyzing disguised problem, adjust impact heat again temperature factor, maintain optimum parameter value, improve power-plant operation economy and management level, monitoring On-line efficiency provide reliably, Data Source really.

A kind of fired power generating unit reheated steam flow computing device that the utility model provides, comprises main steam flow module, main steam loss flow rate calculation module and reheated steam flow rate calculation module; Described main steam flow module is connected with described reheated steam flow rate calculation module, and described main steam loss flow rate calculation module is connected with described reheated steam flow rate calculation module; Described main steam flow module is used for gathering fired power generating unit main steam flow value and this value is sent to described reheated steam flow rate calculation module; Described main steam loss flow rate calculation module is for calculating every loss flow value of main steam flow acting process in cylinder and this value being sent to described reheated steam flow rate calculation module; According to the described main steam flow value receiving and main steam flow, the every loss flow value in acting process in cylinder calculates reheated steam flow value to described reheated steam flow rate calculation module.

Preferably, described main steam flow every loss flow value in acting process in cylinder comprises at least one value in leakage losses flow value in valve rod air loss flow value, cylinder, first paragraph extraction flow value, high pressure cylinder steam discharge leakage losses flow value, second segment extraction flow value; Described main steam loss flow rate calculation module comprises at least one module in Gas leak flow loss computing module, first paragraph extraction flow computing module, high pressure cylinder steam discharge air loss flow rate calculation module, second segment extraction flow computing module in valve rod air loss flow rate calculation module, cylinder.

Wherein, described valve rod air loss flow rate calculation module is for calculating at high pressure main stop valve and governor valve place, and the valve rod air loss flow value of existence also sends to described reheated steam flow rate calculation module by this value; Air loss flow rate calculation module is for calculating the steam that enters high pressure cylinder because the shaft seal overflow along between high intermediate pressure cylinder is to leakage losses flow value in the formed cylinder of intermediate pressure cylinder and this value is sent to described reheated steam flow rate calculation module in described cylinder; Described first paragraph extraction flow computing module is used for calculating first paragraph extraction flow value, and this value is sent to described reheated steam flow rate calculation module; Described first paragraph draws gas as the place of adjusting a wage scale at high pressure, along the expand steam of the scheduled volume that mobile steam extracts out afterwards the 5th grade of high pressure of inter-stage; The high pressure cylinder steam discharge leakage losses flow value that described high pressure cylinder steam discharge air loss flow rate calculation module exists along axle head for calculating high pressure cylinder steam discharge, and this value is sent to described reheated steam flow rate calculation module; Described second segment extraction flow computing module is used for calculating second segment extraction flow value, and this value is sent to described reheated steam flow rate calculation module; Described second segment draws gas and by height, arranges after non-return flap into height row steam, the steam of the scheduled volume of extraction.

Preferably, described high pressure cylinder steam discharge leakage losses flow value comprises at least one value in the high Gas leak flow value that drains into gland heater of high Gas leak flow value, the steam that drains into the female tubular axis end of shaft seal of high Gas leak flow value, the steam that drains into oxygen-eliminating device axle head of steam; Described high pressure cylinder steam discharge air loss flow rate calculation module comprises that height drains into oxygen-eliminating device axle head Gas leak flow computing module, height drains into the female tubular axis end Gas leak flow computing module of shaft seal and height drains at least one module in gland heater Gas leak flow computing module.

Wherein, described height drains into oxygen-eliminating device axle head Gas leak flow computing module for the high Gas leak flow value that drains into oxygen-eliminating device axle head of calculation of steam, and this value is sent to described reheated steam flow rate calculation module; Described height drains into the female tubular axis end of shaft seal Gas leak flow computing module for the high Gas leak flow value that drains into the female tubular axis end of shaft seal of calculation of steam, and this value is sent to described reheated steam flow rate calculation module; Described height drains into gland heater Gas leak flow computing module for the high Gas leak flow value that drains into gland heater of calculation of steam, and this value is sent to described reheated steam flow rate calculation module.

Preferably, the every loss flow value in acting process in cylinder calculates reheated steam flow value according to the described main steam flow value receiving and main steam flow for described reheated steam flow rate calculation module, comprising: described reheated steam flow rate calculation module deducts value that main steam flow obtains after the every loss flow value in acting process in cylinder as reheated steam flow value using the main steam flow value of receiving.

The beneficial effect of said system of the present utility model is as follows:

Above-mentioned calculation element has solved in existing solution prior art can accurately not obtain the problem of reheated steam flow value and the main steam every shunt volume in acting process in cylinder.The utility model can not only obtain reheated steam flow accurately, and can get main steam every shunt volume in acting process in cylinder, thereby for analyzing disguised problem, adjust impact heat again temperature factor, maintain optimum parameter value, improve power-plant operation economy and management level, monitoring On-line efficiency provide reliably, Data Source really.

Accompanying drawing explanation

A kind of fired power generating unit reheated steam flow computing device brief configuration schematic diagram that Fig. 1 provides for the utility model embodiment;

Fig. 2 is the preferred structure schematic diagram of the main steam loss flow rate calculation module 2 in Fig. 1;

Fig. 3 is the preferred structure schematic diagram of the high pressure cylinder steam discharge air loss flow rate calculation module 7 in Fig. 2.

Embodiment

For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

Figure 1 shows that a kind of fired power generating unit reheated steam flow computing device schematic diagram that the utility model embodiment provides, comprise main steam flow module 1, main steam loss flow rate calculation module 2 and reheated steam flow rate calculation module 3.Wherein, main steam flow module 1 is connected with reheated steam flow rate calculation module 3; Main steam loss flow rate calculation module 2 is connected with reheated steam flow rate calculation module 3.Main steam flow module 1 is for gathering fired power generating unit main steam flow value Q _msand this value is sent to reheated steam flow rate calculation module 3; Main steam loss flow rate calculation module 2 is for calculating every loss flow value of main steam flow acting process in cylinder and this value being sent to reheated steam flow rate calculation module 3; According to the main steam flow value receiving and main steam flow, the every loss flow value in acting process in cylinder calculates reheated steam flow value to reheated steam flow rate calculation module 3.

In thermal power plant's monoblock working medium circulation flows, the main steam that boiler produces, through main steam line, is delivered to before steam turbine high pressure main inlet throttle-stop valve.After high pressure main inlet throttle-stop valve and high-pressure governing valve, main steam enters high pressure cylinder nozzle box; At high pressure main inlet throttle-stop valve and high-pressure governing valve place, there is valve stem leakoff and loss.Enter the steam of high pressure cylinder, most of steam expands and does work along turbine blade runner, and small part, along the axle head shaft seal overflow between high intermediate pressure cylinder to intermediate pressure cylinder, forms gland packing leakage and loss in cylinder.The steam that expands and flow and do work at high pressure cylinder inter-stage, extracts afterwards a part of first paragraph that forms out the 5th grade of high pressure cylinder and draws gas, and remainder continues expansion and does work to high pressure cylinder exhaust casing.There is leakage vapour and loss along axle head in high pressure cylinder steam discharge, remains large portion and form high row's steam, and high row's steam is arranged after non-return flap by height, extracts a part of steam formation second segment out and draw gas, and remainder is reheated steam.Therefore, preferably, main steam flow is the every loss flow value in acting process in cylinder, comprises at least one value in leakage losses flow value, first paragraph extraction flow value, high pressure cylinder steam discharge leakage losses flow value, second segment extraction flow value in valve rod air loss flow value, cylinder.

Preferably, as shown in Figure 2, main steam loss flow rate calculation module 2 comprises at least one module in Gas leak flow loss computing module 5, first paragraph extraction flow computing module 6, high pressure cylinder steam discharge air loss flow rate calculation module 7, second segment extraction flow computing module 8 in valve rod air loss flow rate calculation module 4, cylinder.

Wherein, in Fig. 2 valve rod air loss flow rate calculation module 4 for calculating at high pressure main stop valve and governor valve place, the valve rod air loss flow value Q of existence ₁and this value is sent to reheated steam flow rate calculation module 3.At high pressure main stop valve and governor valve place, there is valve stem leakoff and loss, pressing force just branches to high pressure cylinder steam discharge and gland heater.Wherein branching to the part steam of high pressure cylinder steam discharge, is not pay attention to calculating reheated steam flow, therefore only need calculate the part quantity of steam that branches to gland heater.Calculate Q ₁adopt interval function method, by calculating between loading zone, specifically according to formula group (1), calculate:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="HDA00003143494100011.png"\; state="\{\{state\}\}">Q</figure-callout>}}_1=0.35+\frac{0.06}{60}\&times;(P-300),P<360\mathrm{<figure-callout\; id="1"\; label="MW\; Q"\; filenames="HDA00003143494100011.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_1=0.41+\frac{0.1}{90}\&times;(P-360),360\mathrm{MW}\&le;P<450\mathrm{<figure-callout\; id="1"\; label="MW\; Q"\; filenames="HDA00003143494100011.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_1=0.51+\frac{0.07}{60}\&times;(P-450),450\mathrm{MW}\&le;P<510\mathrm{<figure-callout\; id="1"\; label="MW\; Q"\; filenames="HDA00003143494100011.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_1=0.58-\frac{0.12}{90}\&times;(P-510),P\&GreaterEqual;510\mathrm{MW}\end{array}\right.---\left(1\right)$

In formula group (1), Q ₁unit is t/h; P is load, and unit is MW.

Particularly, in Fig. 2 in cylinder air loss flow rate calculation module 5 for calculating the steam that enters high pressure cylinder because the shaft seal overflow along between high intermediate pressure cylinder is to leakage losses flow value Q in the formed cylinder of intermediate pressure cylinder ₂and this value is sent to reheated steam flow rate calculation module 3.Wherein, calculate Q ₂adopt interval function method, by calculating between loading zone, specifically according to formula group (2), calculate:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="2"\; label="Q"\; filenames="HDA00003143494100011.png,HDA00003143494100012.png"\; state="\{\{state\}\}">Q</figure-callout>}}_2=7.32+\frac{1.29}{60}\&times;(P-300),P<360\mathrm{<figure-callout\; id="2"\; label="MW\; Q"\; filenames="HDA00003143494100011.png,HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_2=8.6+\frac{2.07}{90}\&times;(P-360),360\mathrm{MW}\&le;P<450\mathrm{<figure-callout\; id="2"\; label="MW\; Q"\; filenames="HDA00003143494100011.png,HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_2=10.68+\frac{1.52}{60}\&times;(P-450),450\mathrm{MW}\&le;P<510\mathrm{<figure-callout\; id="2"\; label="MW\; Q"\; filenames="HDA00003143494100011.png,HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_2=12.2+\frac{2.39}{90}\&times;(P-510),P\&GreaterEqual;510\mathrm{MW}\end{array}\right.---\left(2\right)$

Wherein, Q ₂unit is t/h; P is load, and unit is MW.

Particularly, the steam at high voltage adjusting level place, expands and flows along inter-stage, extracts afterwards part formation first paragraph out draw gas the 5th grade of high pressure, remainder continue to expand and to do work to high pressure cylinder exhaust casing, thus in Fig. 2 first paragraph extraction flow computing module 6 for calculating first paragraph extraction flow value Q ₃, and this value is sent to reheated steam flow rate calculation module.First paragraph draws gas as the place of adjusting a wage scale at high pressure, along the expand steam 3 of the scheduled volume that mobile steam extracts out afterwards the 5th grade of high pressure of inter-stage.Calculate Q ₃time, by the principle of energy conservation, calculate, concrete according to following formula (3) calculating:

${\mathrm{<figure-callout\; id="3"\; label="Q"\; filenames="HDA00003143494100011.png"\; state="\{\{state\}\}">Q</figure-callout>}}_3=\frac{D_{\mathrm{fw}}\&times;(h_{\mathrm{fw}1}-h_{\mathrm{fw}2})}{h_I-h_{s1}}---\left(3\right)$

In formula (3), Q ₃for first paragraph extraction flow value, unit is t/h; D _fwbe main feedwater flow, unit is t/h; h _fw1for #1 is high, add water outlet enthalpy, unit is kJ/kg; h _fw2for #2 is high, add water outlet enthalpy, unit is kJ/kg; h _Ιfor #1 is high, add the enthalpy that draws gas, unit is kJ/kg; h _s1for #1 HP heater drainage enthalpy, unit is kJ/kg.

Particularly, the high pressure cylinder steam discharge leakage losses flow value that Fig. 2 high pressure cylinder steam discharge air loss flow rate calculation module 7 exists along axle head for calculating high pressure cylinder steam discharge, and this value is sent to reheated steam flow rate calculation module 3.

Particularly, in Fig. 2 second segment extraction flow computing module 8 for calculating second segment extraction flow value Q ₄, and this value is sent to reheated steam flow rate calculation module 3.Wherein second segment draws gas and by height, arranges after non-return flap into height row steam, the steam of the scheduled volume of extraction.Calculate Q ₄time, by the principle of energy conservation, calculate concrete as following formula (4):

${\mathrm{<figure-callout\; id="4"\; label="Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">Q</figure-callout>}}_4=\frac{D_{\mathrm{fw}}\&times;(h_{\mathrm{fw}2}-h_{\mathrm{fw}3})-D_{s1}\&times;h_{s1}}{h_{\mathrm{\&Pi;}}-h_{s2}}---\left(4\right)$

Q ₄for second segment extraction flow, unit is t/h; D _fwbe main feedwater flow, unit is t/h; h _fw2for #2 is high, add water outlet enthalpy, unit is kJ/kg; h _fw3for #3 is high, add water outlet enthalpy, unit is kJ/kg; D _s1for #1 HP heater drainage flow, unit is t/h; h _s1for #1 HP heater drainage enthalpy, unit is kJ/kg; h _Πfor #2 is high, add the enthalpy that draws gas, unit is kJ/kg; h _s2for #2 HP heater drainage enthalpy, unit is kJ/kg.

Preferably, high pressure cylinder steam discharge exists and leaks vapour and loss along axle head, and pressing force height leaks to respectively oxygen-eliminating device, the female pipe of shaft seal and gland heater, remains large portion and forms high row's steam.Therefore high pressure cylinder steam discharge leakage losses flow value comprises at least one value in the high Gas leak flow value that drains into gland heater of high Gas leak flow value, the steam that drains into the female tubular axis end of shaft seal of high Gas leak flow value, the steam that drains into oxygen-eliminating device axle head of steam.

Preferably, as shown in Figure 3, high pressure cylinder steam discharge air loss flow rate calculation module 7 comprises that height drains into oxygen-eliminating device axle head Gas leak flow computing module 9, height drains into the female tubular axis end of shaft seal Gas leak flow computing module 10 and height drains at least one module in gland heater Gas leak flow computing module 11.

Particularly, in Fig. 3, height drains into oxygen-eliminating device axle head Gas leak flow computing module 9 for the high Gas leak flow value Q that drains into oxygen-eliminating device axle head of calculation of steam ₅, and this value is sent to reheated steam flow rate calculation module 3; Wherein, calculate Q ₅, adopt interval function method, by calculating between loading zone, concrete according to following formula group (5) calculating:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="5"\; label="Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">Q</figure-callout>}}_5=2.07+\frac{0.37}{60}\&times;(P-300),P<360\mathrm{<figure-callout\; id="5"\; label="MW\; Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_5=2.44+\frac{0.62}{90}\&times;(P-360),360\mathrm{MW}\&le;P<450\mathrm{<figure-callout\; id="5"\; label="MW\; Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_5=3.06+\frac{0.42}{60}\&times;(P-450),450\mathrm{MW}\&le;P<510\mathrm{<figure-callout\; id="5"\; label="MW\; Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_5=3.48+\frac{0.65}{90}\&times;(P-510),P\&GreaterEqual;510\mathrm{MW}\end{array}\right.---\left(5\right)$

Q wherein ₅unit is t/h; P is load, and unit is MW.

Particularly, in Fig. 3, height drains into the female tubular axis end of shaft seal Gas leak flow computing module 10 for the high Gas leak flow value Q that drains into the female tubular axis end of shaft seal of calculation of steam ₆, and this value is sent to reheated steam flow rate calculation module 3.。Calculate Q ₆adopt interval function method, by calculating between loading zone, concrete according to following formula group (6) calculating:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="6"\; label="Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">Q</figure-callout>}}_6=1.02+\frac{0.26}{60}\&times;(P-300),P<360\mathrm{<figure-callout\; id="6"\; label="MW\; Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_6=1.28+\frac{0.4}{90}\&times;(P-360),360\mathrm{MW}\&le;P<450\mathrm{<figure-callout\; id="6"\; label="MW\; Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_6=1.68+\frac{0..27}{60}\&times;(P-450),450\mathrm{MW}\&le;P<510\mathrm{<figure-callout\; id="6"\; label="MW\; Q"\; filenames="HDA00003143494100012.png"\; state="\{\{state\}\}">MW</figure-callout>}& \\ Q_{}{}_6=1.95+\frac{0.42}{90}\&times;(P-510),P\&GreaterEqual;510\mathrm{MW}\end{array}\right.---\left(6\right)$

Q wherein ₆unit is t/h; P is load, and unit is MW.

Particularly, in Fig. 3, height drains into gland heater Gas leak flow computing module 11 for the high Gas leak flow value Q that drains into gland heater of calculation of steam ₇, and this value is sent to reheated steam flow rate calculation module 3.Wherein, due to Q ₇less, therefore its value is set for design load 0.44t/h.

Preferably, reheated steam flow rate calculation module 3 is according to the main steam flow value Q receiving _mswith main steam flow every loss flow value (Q in acting process in cylinder ₁to Q ₇) calculating reheated steam flow value Q _rh, its concrete computing method are as follows:

Q _rh＝Q _ms-(Q ₁+Q ₂+Q ₃+Q ₄+Q ₅+Q ₆+Q ₇) （7）

The fired power generating unit reheated steam flow computing device that adopts the utility model embodiment to provide, can solve the problem that can not accurately obtain reheated steam flow value and the main steam every shunt volume in acting process in cylinder in prior art.The utility model can not only obtain reheated steam flow accurately, and can get main steam every shunt volume in acting process in cylinder, thereby for analyzing disguised problem, adjust impact heat again temperature factor, maintain optimum parameter value, improve power-plant operation economy and management level, monitoring On-line efficiency provide reliably, Data Source really.In addition, by the heat that calculates flow again, can calculate boiler efficiency, steam turbine hear rate, unit efficiency and coal consumption, analysis efficiency and coal consumption reason of changes, and take corresponding measure to improve economy, instruct the work of power plant for energy conservation consumption reduction.

The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (4)

1. a fired power generating unit reheated steam flow computing device, is characterized in that, comprises main steam flow module, main steam loss flow rate calculation module and reheated steam flow rate calculation module; Described main steam flow module is connected with described reheated steam flow rate calculation module, and described main steam loss flow rate calculation module is connected with described reheated steam flow rate calculation module; Described main steam flow module is used for gathering fired power generating unit main steam flow value and this value is sent to described reheated steam flow rate calculation module; Described main steam loss flow rate calculation module is for calculating every loss flow value of main steam flow acting process in cylinder and this value being sent to described reheated steam flow rate calculation module; According to the described main steam flow value receiving and main steam flow, the every loss flow value in acting process in cylinder calculates reheated steam flow value to described reheated steam flow rate calculation module.

2. a kind of fired power generating unit reheated steam flow computing device according to claim 1, it is characterized in that, described main steam flow every loss flow value in acting process in cylinder comprises at least one value in leakage losses flow value in valve rod air loss flow value, cylinder, first paragraph extraction flow value, high pressure cylinder steam discharge leakage losses flow value, second segment extraction flow value; Described main steam loss flow rate calculation module comprises at least one module in Gas leak flow loss computing module, first paragraph extraction flow computing module, high pressure cylinder steam discharge air loss flow rate calculation module, second segment extraction flow computing module in valve rod air loss flow rate calculation module, cylinder;

Described valve rod air loss flow rate calculation module is for calculating at high pressure main stop valve and governor valve place, and the valve rod air loss flow value of existence also sends to described reheated steam flow rate calculation module by this value;

Air loss flow rate calculation module is for calculating the steam that enters high pressure cylinder because the shaft seal overflow along between high intermediate pressure cylinder is to leakage losses flow value in the formed cylinder of intermediate pressure cylinder and this value is sent to described reheated steam flow rate calculation module in described cylinder;

Described first paragraph extraction flow computing module is used for calculating first paragraph extraction flow value, and this value is sent to described reheated steam flow rate calculation module; Described first paragraph draws gas as the place of adjusting a wage scale at high pressure, along the expand steam of the scheduled volume that mobile steam extracts out afterwards the 5th grade of high pressure of inter-stage;

The high pressure cylinder steam discharge leakage losses flow value that described high pressure cylinder steam discharge air loss flow rate calculation module exists along axle head for calculating high pressure cylinder steam discharge, and this value is sent to described reheated steam flow rate calculation module;

Described second segment extraction flow computing module is used for calculating second segment extraction flow value, and this value is sent to described reheated steam flow rate calculation module; Described second segment draws gas and by height, arranges after non-return flap into height row steam, the steam of the scheduled volume of extraction;

3. a kind of fired power generating unit reheated steam flow computing device according to claim 2, it is characterized in that, described high pressure cylinder steam discharge leakage losses flow value comprises at least one value in the high Gas leak flow value that drains into gland heater of high Gas leak flow value, the steam that drains into the female tubular axis end of shaft seal of high Gas leak flow value, the steam that drains into oxygen-eliminating device axle head of steam; Described high pressure cylinder steam discharge air loss flow rate calculation module comprises that height drains into oxygen-eliminating device axle head Gas leak flow computing module, height drains into the female tubular axis end Gas leak flow computing module of shaft seal and height drains at least one module in gland heater Gas leak flow computing module;

Described height drains into oxygen-eliminating device axle head Gas leak flow computing module for the high Gas leak flow value that drains into oxygen-eliminating device axle head of calculation of steam, and this value is sent to described reheated steam flow rate calculation module;

Described height drains into the female tubular axis end of shaft seal Gas leak flow computing module for the high Gas leak flow value that drains into the female tubular axis end of shaft seal of calculation of steam, and this value is sent to described reheated steam flow rate calculation module;

Described height drains into gland heater Gas leak flow computing module for the high Gas leak flow value that drains into gland heater of calculation of steam, and this value is sent to described reheated steam flow rate calculation module.

4. according to a kind of fired power generating unit reheated steam flow computing device described in claims 1 to 3 any one, it is characterized in that, the every loss flow value in acting process in cylinder calculates reheated steam flow value according to the described main steam flow value receiving and main steam flow for described reheated steam flow rate calculation module, comprising: described reheated steam flow rate calculation module deducts value that main steam flow obtains after the every loss flow value in acting process in cylinder as reheated steam flow value using the main steam flow value of receiving.

Images