SU1506154A1 - Method of starting power uni containing boiler and turbine - Google Patents

Abstract

The invention relates to a power system and can be used in power units of a boiler-turbine with steam superheating. In order to reduce the start-up time and heat loss by increasing the flow rate of steam passed through the steam lines of the intermediate superheater, during the start-up process, the pressure in the cooling lines of the intermediate superheater is controlled, compared with the vapor pressure at the outlet of the high pressure cylinder and when the pressures are equal, the steam supplied to the cooling the threads from an external source are mixed with steam exiting the high pressure cylinder. 1 il.

Description

The invention relates to heat and power engineering and can be used on modular steam turbines with intermediate steam superheating.

The purpose of the invention is to reduce start-up time and heat loss.

The drawing shows a diagram of the implementation of the method.

The diagram shows an energy unit containing a steam boiler 1 connected by a main steam line 2 to a high-pressure cylinder 3 (HPC) of a turbine, which is connected to an intermediate superheater 4 by cold threads 5 connected to an external source (kindling separator) 6 through a valve 7. The HPC 3 in the course of the steam is located a separator valve 8, before and after which pressure sensors 9 and 10 are installed, connected electrically to the comparator unit 11, the output of which is electrically connected to the actuator 12 of the valve 8. Starting separator p 6 is connected via the built in separator 13 and the discharge pipe 14 to the evaporator 15 of the boiler 1. The last one during the start-up period through the built-in separator 13 is connected to the superheater 16 of the boiler 1. Hot threads 17 of the intermediate superheater 4 are connected to the medium pressure cylinder 18 (DSC) and further to the low-pressure cylinder 19 (LPC) of the turbine, the outlet of which is connected to the condenser 20.

To the main steam line 2 before stool-porn-regulating valves 21 CVP 3 connected start-reset device

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22, connected to the condenser 20, and to the hot strings 17 in front of the stop-regulating valves 23 of the CCD 18 - a waste pipe 24 connected to the condenser 20.

The start-up of the boiler-turbine unit is carried out as follows.

After the kindling of the rotary boiler 1, the steam generated in the built-in separator 13 is directed through the superheater 16 to warm up the main steam line 2 with discharge through the start-discharge device 22 to the condenser

1506154

Unnecessary consumption of steam from the starting separator 6 from the HPC 3 accelerates the output to the jogging parameters of the steam before the CCD 18. Next, proceed to the operation of supplying steam to the CCD 18 and recruiting the nominal speed of the turbine. This technology allows to shorten the heating time of the steam pipelines of the intermediate superheater, which, in turn, reduces the start-up time of the boiler-turbine power unit and heat loss, and also eliminates the operation

20, and the steam generated after the drosse-steaming superheater

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The boiling water in the discharge pipe 14 is transferred from the pilot separator 6 through the valve 7 and sent along the cold threads 5 of the intermediate superheater 4 to warm up the 20 different strands 17 and drain it through the discharge pipe 24 to the condenser 20.

When the jog parameters of fresh steam are reached, the valves 21 are opened, the pressure in the high pressure cylinder 3 is raised with a vapor pressure signal from the sensor 9 at the output of the high pressure cylinder and the sensor 10 behind the closed valve 8 on the cold threads 5 of the intermediate superheater 4 in the comparison unit 11. When the signals from sensors 9 and 10 are equal, the output of the comparator unit 11 produces a control signal to the actuator 12 of the valve 8 and the latter is opened by mixing the steam from the high-pressure cylinder 3 to the pair after the pilot separator 6. At the same time, the rotational speed of the turbine does not exceed the first critical frequency.

As a result, on the one hand, a smooth heating of the steam inlet of the HPC 3 is carried out, and on the other hand, due to the intensive reheating of the hot threads 17 of the intermediate superheater 4,

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the associated cooling of the commissioning of the high-pressure cylinder with a decrease in pressure in it.

Claims (1)

Formula invented The method of launching a power turbine boiler by firing the boiler, heating the main steam lines and the high pressure cylinder of steam by supplying steam from the boiler with a steam pressure outlet from the cylinder, and heating the steam lines of the intermediate steam superheater to steam from an external source to the cold threads A superheater, characterized in that, in order to shorten the start-up time and heat losses, additionally control the vapor flow in the cold threads of the intermediate superheater, compare this pressure with the pressure The steam coming out of the cylinder is high pressure, and when the pressure is equal to the comparable pressures, I mix the steam fed into the cold threads with steam leaving the pressure cylinder.  overheating of steam superheater five 0 .. 0 five and the associated cooling of the steam inlet of the CVP with a decrease in pressure in it. Invention Formula The method of starting the boiler-turbine power unit by firing the boiler, heating the main steam lines and the high-pressure cylinder of the turbine by supplying steam from the boiler with control of steam pressure coming out of the cylinder, and heating the steam lines of the intermediate superheater by supplying steam from an external source to the cold threads of the intermediate superheater, differs By the fact that, in order to reduce the start-up time and heat loss, the vapor pressure in the cold strings of the intermediate superheater is additionally controlled ivayut this pressure to the vapor pressure, a high pressure discharged from the cylinder, and when the equality of the compared pressure mixed steam supplied during the cold thread, with steam exiting vytoko- of pressure from the cylinder. . I T V-n II