SU798408A1

SU798408A1 - Method of hot redundancy of drum-type boiler

Info

Publication number: SU798408A1
Application number: SU792731973A
Authority: SU
Inventors: Ашот Арменович Мадоян; Василий Николаевич Балтян; Александр Никитович Гречаный
Priority date: 1979-02-26
Filing date: 1979-02-26
Publication date: 1981-01-23

Description

(54) СПОСОБ ГОРЯЧЕГО РЕЗЕРВИРОВАНИЯ БАРАБАННОГО КОТЛА(54) METHOD FOR HOT RESERVATION OF DRUM BOILER

1one

Изобретение относитс к области теплоэнергетики и может быть использовано на тепловых электростанци х при останове парогенераторов в гор чий резерв с целью ускорени последующего пуска.The invention relates to the field of heat and power engineering and can be used in thermal power plants when the steam generators are stopped in a hot reserve in order to accelerate the subsequent start-up.

Наиболее близким к предлагаемому вл етс способ резервировани барабанного котла, содержащего пароперегрева тель и систему экранов с нижними коллекторами путем подачи пара от постороннего источника череэ пароперегреватель в барабан Щ.Closest to the present invention is a method for reserving a drum-type boiler containing a steam superheater and a system of screens with lower headers by supplying steam from an external source of a superheater to a drum of Sch.

Недостатком способа вл етс низкий уровень прогрева пароперегревател ввиду малого расхода пара (около 1% от паропроизводительности котла ) при значительной поверхности пароперегревател . В результате происходит конденсаци пара во входных ступен х пароперегревател и захолаживание нижних точек змеевиков пароперегревател , что может привести к возникновению тепловых и гидравли-ческих ударов при последующих пусках . Увеличени расхода пара трудно достичь из-за низкой степени конденсации его в барабане. Кроме того, отсутствует прогрев экранной система топочной камеры.The disadvantage of this method is the low level of heating of the superheater due to low steam consumption (about 1% of the boiler output) with a significant surface of the superheater. As a result, steam is condensed in the input stages of the superheater and cooling down of the lower points of the superheater coils, which can lead to thermal and hydraulic shocks during subsequent starts. Increasing steam consumption is difficult to achieve due to the low degree of condensation in the drum. In addition, there is no warm-up screen system of the combustion chamber.

Целью данного изобретени вл ет с повышение экономичности и надеж ности за счет ускорени последующего пуска котла путем поддержани на достаточно высоком температурном уровне его испарительного и паропербгревательного трактов, а также повышение надежности работы элементов пароперегревател за счет отсут0 стви значительных разностей температур металла по ходу пароперегревател .The purpose of this invention is to increase the economy and reliability by accelerating the subsequent start-up of the boiler by maintaining its evaporation and steam-heating paths at a sufficiently high temperature level, as well as improving the reliability of the superheater elements due to the absence of significant temperature differences in the metal along the steam superheater.

Указанна цель достигаетс тем, что одновременно с подачей пара в This goal is achieved by the fact that simultaneously with the supply of steam to

5 барабане распиливают питательную воду, а полученный конденсат отвод т через систему экранов из ее нижних коллекторов,5, the drum is cut into feedwater, and the condensate is discharged through a system of shields from its lower headers,

На чертеже представлена схема ре0 зервировани барабанного котла.The drawing shows a scheme for reserving a drum boiler.

В котел, снабженный пароперегревателем 1, системой экранов 2 с нижними коллекторами 3 из постороннего источника (например, от-общестанци5 онной паровой магистрали) 4 подают пар, поступающий в барабан 5. Одновременно из общестанционной магистрали 6 в барабан 5 подают питательную воду и распыливают ее с помощью Into the boiler, equipped with a superheater 1, a system of screens 2 with lower collectors 3 from an external source (for example, from the station-wide steam main) 4, steam is supplied to drum 5. Simultaneously, feed water is fed from station-wide line 6 to the drum 5 and spray it via

Claims

0 nozzles 7 in the steam volume of the drum. Steam condensate is discharged through a screen system 2 of its lower headers. 3, maintaining the water level in the drum 5. As applied to the KES-90 ata natural circulation drum boilers with cross-links, when the boiler is stopped and in a hot reserve, steam is supplied with parameters (P 90 ata, t) for maintaining the temperature of the metal superheater at 400c. To condense the steam discharged into the drum in the steam volume, 2.95 kg of feedwater are sprayed with parameters (P 110 kg / cm, t 160 ° С) for each kg of green steam. The duct through the screen system of hot condensate with the initial saturation parameters in the drum should ensure the temperature of the metal of the screens at 300C. The parameters of the superheater metal are maintained by using a steam regulator with a pulse of metal temperature and a condensate discharge regulator with a pulse in the drum. Spraying the feed water in the drum at the same time as steam supply and condensate drainage from the lower collectors of the screen system allows to increase the reliability of the metal superheater and the drum in the start-stop mode by maintaining a sufficiently high and stable temperature level and the absence of standing corrosion of the screen system due to the constant flow hot condensate, as well as increased efficiency by reducing the duration of subsequent starts. The invention of the method of hot backup drum boiler containing a superheater and a system of screens with lower collectors by supplying steam from an external source through the superheater to the drum, in order to improve efficiency and reliability, simultaneously with feed water in the drum is sprayed with feed water, and the resulting condensate is discharged through a system of screens from its lower collectors. Sources of information taken into account during the examination 1. Released R. Cooling the stopped drum boiler and maintaining it in a hot condition. Thermal Engineering, Express Information, Moscow, VINITI, 1973, No. 40, ref. 186, p. one.