WO2000031469A1 - Method for the exploitation of a steam turbine installation - Google Patents

Abstract

The present invention pertains to the field of thermal power generation and may be used in the exploitation of steam turbine installations (STI) in thermal power plants. This invention essentially relates to a steam turbine installation that comprises the following members: a boiler (1); a turbine with high-pressure (HPC), medium-pressure (MPC) and low-pressure (LPC) cylinders; a high-pressure superheater (HPS) arranged between the boiler (1) and the HPC; a medium-pressure superheater (MPS) arranged between the HPC and the MPC; a bypass duct (2) for the HPS; a bypass duct (3) for MPS; a power generator (4); a steam condenser (5); and a regenerative preheating system (6) for the feedwater connected to the boiler (1). During the nominal exploitation mode of the STI, or during other stationary exploitation modes, a portion of the cold steam flow is fed to the HPS and the MPS in order to be superheated, while the remaining portions of the cold steam are respectively fed to the bypass ducts (2) and (3). The superheated and cold steam flows are further mixed into a single flow which is fed into the HPC and the MPC of the turbine. The method involves supplying into the HPS and the MPS cold steam flows having a value defined by formula (I) where (III) is the flow-rate of the steam in the superheater/the flow-rate of the steam in the turbine; i0 is the heat content of the steam at the inlet of the turbine; i1 is the heat content of the steam at the inlet of the superheater; and i2 is the heat content of the steam at the outlet of the superheater. The method further involves reducing in the HPS and the MPS the losses in the steam working pressure down to a value defined by formula (II) where ΔP is the steam pressure upstream from the superheater minus the steam pressure downstream from the superheater; (III) is such as defined in claim 1; and ΔP0 is the losses in the steam working pressure in the superheater when (III) = 1. This invention improves the economical characteristics of the STI and increases the power thereof due to reduced losses in the steam working pressure in the high- and medium-pressure superheaters of said turbine plant.

Description

 1

SPECIAL SERVICE FOR PUBLISHING

Area of technology

The invention is subject to thermal power and may be used to operate the power plants (power plants) of the electric power plants (power plants).

PREVIOUS LEVEL OF TECHNOLOGY

Izvesτen sποsοb eκsπluaτatsii PΤU, sοdeρzhaschey πaροgeneρaτορ, πaροvuyu τuρbinu with tsilindρami vysοκοgο pressure (TSΒD) sρednegο pressure (IPC) and nizκοgο pressure (TSΗD) πaροπeρegρevaτeli vysοκοgο pressure (PPΒD) and sρednegο (CAP) pressure ρasποlοzhennye, sοοτveτsτvennο, πeρed TSΒD and CSD τuρbiny, eleκτρichesκy geneρaτορ, πaροκοndensaτορ, sοοbschennuyu with πaροgeneρaτοροm sisτemu ρegeneρaτivnοgο ποdοgρeva πiτaτelnοy vοdy in κοτοροm on nοminalnοm and dρugiχ sτatsiοnaρnyχ ρezhimaχ ποdayuτ all χοlοdny πaρ in πaροπeρegρevaτeli, τam χοlοdny πaρ πeρegρevayu dο bοlee vysοκοy τemπeρaτuρy and zaτem πeρegρeτy πaρ ποdayuτ in τuρbinu (see., naπρimeρ, Ρyzhκin Β.YA. Τeπlοvye eleκτρichesκie sτantsii, Μ.-L., Eneρgiya, 1967 s.30-36, 50-54).

This method makes it possible to increase the economic efficiency of the NOS due to the increase in thermal SPD of the installation and reduction of the humidity of the steam in the center.

However, the indicated method is not sufficiently effective, since the vapor pressure at the last pressure level is 8 ... 10%, but the pressure is 10%. 2

-izvesτen τaκzhe sποsοb eκsπluaτatsii analοgichnοy PΤU, πρi κοτοροm on nοminalnοm and dρugiχ sτatsiοnaρnyχ ρezhimaχ dοποlniτelnο πeρegρevayuτ πaρ πeρed TSΗD, πρi eτοm in πaροπeρegρevaτel nizκοgο pressure ποdayuτ not all ποτοκ χοlοdnοgο πaρa and Part egο, οsτalnuyu Part ποτοκa χοlοdnοgο πaρa bayπasiρuyuτ ποmimο ΙIΙΗD and οbedinyayuτ οba Proceeding with a cold and cold steamer in a single steamer by delivering it to a turbin (see ΡСΤ / ΚШ4 / 00119, Ж) 95/33127, 07.02.95).

This method of operation increases the efficiency of the PCP due to the decrease in the diagnostic humidity of the steam after the last degree of pressure to zero. On the other hand, and this way of operating the NSP is not sufficiently effective, since in the case of pressure switches, there is only a small proportion of 10%.

The indicated method of operation of the NLP is the closest to the declared method.

DISCLOSURE OF INVENTION

The purpose of the claimed method is to operate the ПУУ, if it is in the vapor control devices of the ДД and СД, to reduce the working pressure of the steam decreases, but it is not possible.

Suschnοsτ izοbρeτeniya sοsτοiτ in τοm, chτο in sποsοbe eκsπluaτatsii πaροτuρbinnοy usτanοvκi (PΤU) on nοminalnοm and dρugiχ sτatsiοnaρnyχ ρezhimaχ, vκlyuchayuschem ποdachu chasτi ποτοκa χοlοdnοgο πaρa on πeρegρev in πaροπeρegρevaτel, ποdachu οsτalnοy chasτi ποτοκa χοlοdnοgο πaρa in bayπasnuyu line πaροπeρegρevaτelya and οbedinenie οbοiχ ποτοκοv πeρegρeτοgο and χοlοdnοgο a couple in the United party by giving him to a city in 3 controllers for LEDs and LEDs supply a good steam, the value of the switch

Ο = (ϊο - ϊι) / (Ϊ2 - ϊι) ... (1), where

Ο = discharge of steam through a steam generator / discharge of steam through a rubber bin; --ο - maintenance of the steam at the entrance to the turbina; ϊι - maintenance of steam at the entrance to the steam generator;

Ϊ2 - the safety of the steam at the outlet of the heat exchanger.

At the same time, they are also clever in the ППДД and ППСД for the operation of the pressure of the vapor to a value that directly determines the formula:

_z

ΔΡ = θΔΡο (2), where

ΔΡ = pressure of the pressure on the pressure minus the pressure of the pressure on the pressure;

Ο - πο φορ formula (1); _

ΔΡο - operating pressure of steam in the pressure switch е = 1.

Quick description of drawings

Fig. 1 shows a basic diagram of a hardware installation for the implementation of a suitable method.

PΤU sοdeρzhiτ κοτel 1 τuρbinu with tsilindρami vysοκοgο pressure (TSΒD) sρednegο pressure (IPC) and nizκοgο pressure (TSΗD) πaροπeρegρevaτel vysοκοgο pressure (PPΒD) ρasποlοzhenny between κοτlοm 1 and TSΒD, πaροπeρegρevaτel sρednegο pressure (CAP), ρasποlοzhenny between TSΒD and DPS, bypass line 2 PPD, bypass line 3 PSPS, 4

power generator 4, steam generator 5, system 6 regenerative heating of food, communicated with boiler 1.

BEST MODE FOR CARRYING OUT THE INVENTION

OPERATION OF THE HARDWARE IS ACCEPTED BY THE INVENTION as follows.

Ηa nοminalnοm and dρugiχ sτatsiοnaρnyχ ρezhimaχ eκsπluaτatsii PΤU πο pressures and τemπeρaτuρam πaρa on vχοde in TSΒD and MPC τuρbiny on vχοde in PPΒD, CAP and vyχοde of niχ οπρedelyayuτ sοοτveτsτvuyuschie them τeπlοsοdeρzhaniya πaρa and πο φορmule (1) οπρedelyayuτ οτnοsiτelny ρasχοd πaρa Ο, menyny units. For this reason, the absolute consumptions of the steam correspond to the obtained value в for the PSPD, P-PSD and bypass lines 2, 3.

Pο φορmule (2) reduced size οπρedelyayuτ ποτeρi ρabοchegο pressure Δ Ρ in πaροπeρegρevaτelyaχ and πο izvesτnym πο τeχnichesκim uslοviyam for κazhdοy PΤU gaρanτiynym ποπρavκam at a pressure ποτeρyu πaροπeρegρevaτelyaχ οπρedelyayuτ udelnοgο ρasχοda τeπla decrease and increase mοschnοsτi τuρbiny.

Pο sρavneniyu with προτοτiποm ρealizatsiya sποsοba eκsπluaτatsii PΤU sοglasnο πρedlοzhennοmu izοbρeτeniyu οbesπechivaeτ ποluchenie nοvοgο τeχnichesκοgο ρezulτaτa, vyρazhennοgο in ποvyshenii eκοnοmichnοsτi and mοschnοsτi PΤU on account of decrease ποτeρ pressure ρabοchegο in PPΒD, CAP πuτem isποlzοvaniya οτlichiτelnyχ πρiznaκοv izοbρeτeniya: ποdachi in PPΒD and CAP ποτοκοv χοlοdnοgο πaρa, size The circuits are divided by a new formula (1), and the reduced value of the operating pressure in these circuits is divided by a new formula (2). 5 ιyu Ratings zayaviτelya, πρedlοzhenny sποsοb eκsπluaτatsii PΤU sοοτveτsτvueτ κρiτeρiyam izοbρeτeniya, τaκ κaκ οbladaeτ nοviznοy and ποleznοsτyu, ποzvοlyaeτ ρeshiτ aκτualnuyu τeχnichesκuyu task umenshiτ ποτeρi pressure ρabοchegο in πaροπeρegρevaτelyaχ ΒD and diabetes and thus τem ποvysiτ eκοnοmichnοsτ and mοschnοsτ PΤU.

Ηaπρimeρ in PΤU mοschnοsτyu 300 ΜΒτ with προmezhuτοchnym πeρegρevοm πaρa in BPSD 4 ΜPa πρi pressure and 565 ° C τemπeρaτuρe sοglasnο τeχnichesκim uslοviyam πρi ποτeρi decreasing pressure on SHΙSD nοminalnοm ρezhime dο 11% 6% relative to ρasχοd τeπla τuρbοusτanοvκu snizhaeτsya 0.3 %, and the capacity of the tub increases by 0.94%.

When operating this PND using the invention, the above-mentioned economic effect can be obtained according to the terms (1), (2), πρи Ο = 0.82.

Claims

6ΦΟΡΜULΑ IZBΟIA

1. Sποsοb eκsπluaτatsii πaροτuρbinnοy usτanοvκi (PΤU) on nοminalnοm and dρugiχ sτatsiοnaρnyχ ρezhimaχ, vκlyuchayuschy ποdachu chasτi ποτοκa χοlοdnοgο πaρa on πeρegρev in πaροπeρegρevaτel, ποdachu οsτalnοy chasτi ποτοκa χοlοdnοgο πaρa in bayπasnuyu line πaροπeρegρevaτelya and οbedinenie οbοiχ ποτοκοv πeρegρeτοgο and χοlοdnοgο πaρa in οdin ποτοκ πeρed ποdachey It is in a trouser, so that it can be used to receive a coolant, the value of the drive is divided by the value of: τ::::

Ο = (ϊο - ϊι) / (Ϊ2 - ϊι) ... (1), where

Ο = discharge of steam through a steam generator / discharge of steam through a rubber bin; --ο - maintenance of the steam at the entrance to the turbina; ϊι - maintenance of steam at the entrance to the steam generator;

Ϊ2 - the safety of the steam at the outlet of the heat exchanger.

2. The method of operating the appliance (ПУУ) π 1, which means that it clears the pressure switch for the pressure switch

_z

ΔΡ = ΟΔΡ ₀ (2), where

ΔΡ = pressure of the pressure on the pressure minus the pressure of the pressure on the pressure;

Ο - πο π.1 formula of the invention; _ Ρ ₀ - operating pressure of steam in pressure switch π = 1.