SU1219870A1 - Method of boiler plant operation and installation for accomplishment of same - Google Patents

Abstract

1. A method of operating a boiler plant comprising two drum boilers with superheaters and injection boilers, by adjusting the temperature of the superheated steam by injecting condensate into the desuperheater of one of the boilers, characterized in that, in order to improve the quality of superheated steam temperature control and increase the superheater reliability operation of one of the boilers in the start-up mode, in the desuperheater of the last injection-. nod condensate derived from a pair of drums of another boiler operating. at a pressure greater than in the fired boiler. (L. / U 7 f trf you with 00 4

Description

2. A boiler plant containing two drum-type boilers, equipped with its injection capacitors, connected with steam supply lines to their drums, and discharge pipes through a control valve to the injection coolers with a circuit that controls the temperature of the superheated

The invention relates to heat engineering, namely to boiler installations with drum boilers, and can be used to control the temperature of the superheated steam of the drum boiler when it is started.

The aim of the invention is to improve the quality of controlling the temperature of superheated steam and increase the reliability of the superheater during operation of one of the boilers in the start mode.

The drawing shows a diagram of a boiler plant for implementing the method.

The boiler plant contains drums 1 and 2 of the boilers, each of which is equipped with an injection condenser 3 (not shown for the second boiler), connected. By supplying a steam line 4 to its drum 1, and a discharge pipe 5 through a regulating valve 6 to an injection cooler 7, The supply steam line 4 of the injection condenser 3 is equipped with a non-return valve 8, zone 9, downstream of the latter, is connected by an additional steam line 10 equipped with a check and throttle valve 11 and 12 to the drum 2 of the other boiler. In addition, each boiler contains a feed pipe 13 connected to the injection condenser 3, and a superheater 14, and the drums 1 and 2 are interconnected by pipes 15 of preheating.

The method of operation of the boiler plant is carried out as follows.

When starting the first steam steam from the drum 2 of the operating boiler through valve 12 through the steam line 10 serves

219870

steam and reliability of the superheater during the operation of one boiler in the start-up mode, the supply steam lines of the injection condensers are equipped with check valves and each in the zone downstream of the latter is connected with an additional steam line equipped with check and throttle valves to the drum of the other boiler.

to the condenser 3, where it is condensed, cooled by feedwater flowing through conduit 13 through the condenser 3 to the drum 1. At the same time, the check valve 8 is closed and the condenser 3 is disconnected by steam from the drum 1, which allows regulating the condensate pressure in the condenser 3 regardless of the pressure in the drum 1 of the boiler being heated by means of valve 12. Condensate to control the temperature of the steam in the superheater 14 serves s superheater 7, regulating its flow

valve 6. After reaching the load of the boiler being heated up to the value at which the own condensate is supplied to the injection, valve 12 is closed. Wherein

Steam from drum 1 begins to flow into condenser 3 through steam line 4 through: a check valve 8, which opens under the influence of the pressure of steam from drum 1, and the boiler switches to operation with steam temperature control by injection of its own condensate.

Example. The pressure in the drum 1 of the boiler being heated, at which

shut off the extraneous steam supply and provide regulation with own condensate, they are determined for each type of boiler based on the following features: design. For example,

for boiler performance

500 t / h. Supply of own condensate for injection in start-up modes. Provide starting from a load of more than 200 t / h, at which pressure

IB drum heatable boiler

(It is 60-70 kgf / cm, and the temperature of the nutrient veda is 110-120 ° C. The unit start-up is performed at sliding pressure. The nominal pressure of the steam in the drum is 2,160 kgf / cm. Therefore, when the second boiler operates in a stationary mode with a nominal pressure in the drum 2, the pressure in front of the valve 1.2 exceeds the pressure in the drum 1 by at least 70-80 kgf / cm. Such a difference allows the supply of steam from the drum 2 to the condenser 3 and having a pressure in this condenser 3 greater than in drum 1 about 5 kgf / cm to enable operation of valve 6 to the greatest advantage At the turbine push pressure of 15 kgf / cm saturation temperature, the injected concentrate, taking into account throttling on valve 6 and supercooling in condenser 3, is at a level of 180–1900 ° C, i.e. the same as the temperature in the superheater of the boiler being heated to 14. With an increase in the load and, accordingly, the pressure in the boiler being heated, the author J.Nesterov Editor A.Vorovich Tehred V.Kadar Corrector A.Ferents

1311/47 Circulation 398 - Subscription VNISH1I USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Branch P1P Patent, Uzhgorod, Proektna St., 4

(by throttling the throttle control valve 12, the pressure in the injection condenser 3 is increased, as a result of which the saturation temperature in the condenser 3 rises. This, in turn, ensures the supply of condensate of this steam to the injection in the desuperheater 7 throughout the entire range of starting conditions to the transition load on

regulation of the injection of its own condensate with a high saturation temperature, which causes rapid boiling up in the volume of the desuperheater 7 and eliminates cooling. Thus, the proposed method of operation of the boiler plant in start-up modes and the installation of its implementation increases the reliability of the operation of the superheater 14 due to

injection of steam condensate from an external source, free of salts and having a high temperature, which eliminates the overheating of the superheater 14, leading to overfilling of the coils

and the occurrence of inadmissible thermal stresses in the metal of the pipelines causing the cracking.

Claims (2)

D. The method of operation of a boiler plant containing two drum boilers with superheaters and injection desuperheaters by controlling the temperature of superheated steam by injecting condensate into the desuperheater of one of the boilers, characterized in that, in order to improve the quality of temperature regulation of superheated steam and increasing the reliability of the superheater during operation of one from boilers in start-up mode, to the last injection desuperheater. they nod the condensate obtained from the steam drum of another boiler operating. at a pressure greater than that in the starting boiler. SU .. „1219870> 2. A boiler plant containing two drum boilers, equipped with their injection condensers, connected by supply pipelines to their drums, and discharge pipes through a control valve - to injection desuperheaters, characterized in that, in order to improve the quality of temperature control of superheated steam and increase the reliability of the superheater during operation of one boiler in start-up mode, the supply lines of injection condensers are equipped with check valves and each in the zone after the last flow a steam pipe connected further provided with a 'reverse and throttle valves to another drum boiler.