Starting system steam turbine with reheat steam

 

(57) Abstract:

Starting system is designed to start block steam turbine installation dubaians the starting circuit. Starting system contains discharge steam line with a ROW between the steam fresh steam and cold reheat line for the passage of steam bypassing the CVP, his control valves with servo controlled electric system, the check valve direct acting output CVP to prevent steam from cold reheat line in CVP and hydraulic control system. When this check valve associated with the actuator single acting, in-line discharge pressure which is installed shutoff valves with electric drive, which is connected with the electrical control system regulating valves CVP, providing opening valves synchronously with the opening of the control valves CVP. This ensures a high reliability of the check valve and eliminates its influence on the hydrodynamics of the steam passing through it a stream. 1 Il.

The invention relates to a heat block diagrams steam turbine with reheat steam and can be used in the starting sitaara (reheat) by using dubaians start-up scheme, providing a supply of steam at start-up in cold reheat line to the bypass cylinder (or parts) high pressure (CVP) of the turbine. When starting the system, which is part of the General system of steam distribution, contains discharge steam with pressure reducing and desuperheating device (ROWE) between the steam fresh steam and cold reheat line pair [1]. To prevent dangerous to the turbine hit a pair of low settings from the cold reheat line to high on the exhaust of the CVP install valves [2] . As a last previously used motor driven valve associated with the control system of the distribution of steam turbine. However, operating experience has shown that this valve does not provide the necessary performance and insufficiently reliable. So instead she began to apply the check valves direct acting, in particular a rotary damper.

This starting system containing discharge steam line with a ROW between the steam fresh steam and cold reheat line, control valves CVP with servo motors and electric control system, the check valve direct acting output CVP and hydraulic control system, AVK work however, when the opening of the valve occurs under the action of the steam flow fluctuations of the valve to cause pulsations of the steam flow, which affects the efficiency and durability of the equipment.

The present invention tasked with developing a launch system steam turbine as described above, in which the shut-off valve at the outlet of the CVP would have the same high reliability as a reverse valve direct acting, but which, however, the open position would not disturbing effect on passing through her steam flow.

This problem is solved in the starting system steam turbine with reheat steam, which contains discharge steam line with a ROW between the steam fresh steam and cold reheat line, control valves CVP with servo motors and electric control system, the check valve direct acting output of the CVP and the hydraulic control system and in which, in accordance with the essence of the present invention, a check valve associated with the actuator, the line pressure of the pressure which has valves with electronic the Ohm, to open this gate valve was carried out synchronously with the opening of the control valves CVP.

In this starting system check valve functions as a conventional valve direct acting, i.e. opens under the action of the vapor pressure of the high-pressure and closed when you start steam discharged through the steam pipe under the action of the vapor pressure of the cold reheat line. At the same time, thanks to a specified entity invention, simultaneously with the opening of the control valves CVP is the opening of valves in the line pressure of the servo valve, and thereby the actuator has an additional impact on the non-return valve, hold it in the fully open position. Thus, the check valve removed from steam flow, resulting in the possibility of its pulsations, and he does not have a stimulating effect on the steam passing through it a stream.

The essence of the present invention is illustrated in the following further detailed description of the example of its implementation with the application of drawing, which schematically depicts the starting system steam turbine with reheat steam.

The example relates to steam moratoria installation also contains the boiler 4 with intermediate superheater 5.

The steam line 6 fresh pair connected to the input CVP 1 through the stop valve 7 and a pressure regulating valve 8 and through the discharge pipe 9 with pressure reducing and desuperheating device (ROWE) 10 associated with cold line 11 reheat.

Hot line 12 reheat connected to the input medium 2 through the stop valve 13 and a pressure regulating valve 14. Hot line 12 reheat steam is connected also equipped with a pressure reducing and desuperheating device (ROWE) 15 sbresny pipeline 16 to the condenser 17.

The output pair of the CVP 1 in the cold line 11 reheat check valve 18, which is connected with a spring-hydraulic servo unilateral action 19. The cavity pressure of the actuator 19 is connected with the line pressure to a pressure of 20 of the turbine regulation system through the valve 21 with the actuator 22, which is connected with the electrical control system regulating valves 8 so that a command signal is supplied synchronously with the command signal, the controlling position of the control valves CVP 8.

Start the turbine with the described starting scheme is as follows.

After reaching at the exit of the boiler 4 certain parameters When reaching the design parameters of steam leaving the boiler 4 and the vacuum in the condenser 17 shall start steam turbine steam supply in the medium 2 in the perimeter CVP 1. Fresh pairs through ROW 10 is fed into the cold line 11 reheat when closed control valve 8 high-pressure turbine 1 and the open stop 13 and the regulating valve 14 MPC 2.

High-pressure turbine 1 at this stage of the start connected lines obespylivanija (not shown) with the capacitor 17 and is under pressure, substantially less than in the lines reheat, causing the check valve 18 is in the closed position under the simultaneous effect of efforts steam from line 11, which is directed in the direction of closing the valve, and the efforts of the springs of the actuator 19, which is directed in the direction of closing the valve, because the valve 21 with the actuator 22 is closed on the fact that the control valves 8 at this stage trigger is in the closed position.

In the subsequent steam in CVP 1 open when locking the valves 7, increasing the control pressure regulating valve 8 CVP 1 open control valves 8 and close the valves on the lines obespylivanija CVP 1. As a result of this check valve 18 is opened under the action of increased pressure steam at the outlet of CVP 1 and let steam into the cold reheat line.

After submitting the command signal to open the I valve 21 on the line pressure to a pressure of 20 to the actuator 19, under the action of the servo valve 18 is translated in the fully open position, is removed from the steam flow and further held in position.

Described starting system is also used when deep discharge turbine for electric power.

In this case, to close the valve 18 by the actuator 19 is sufficient so that upon closing of the regulating valve 8 is closed and valve 21 with the actuator 22 on line 20 discharge pressure to the actuator 19, whereupon the check valve 18 will be in the closed position under the simultaneous effect of steam efforts from the cold line 11 reheat aimed in the direction of closing the valve and efforts springs its actuator 19, which is directed in the direction of valve closing.

Sources of information

1. A. Q. Truini, S. M. Losev. Stationary steam turbines. M., 1981, S. 419-420, Fig.13.3.

2. Ibid, Fig. 13.5 - POS. 24.

3. Auth. St. USSR N 1044068, F 01 K 13/02, 1984

Starting system steam turbine with reheat steam containing discharge pipeline with a pressure reducing and desuperheating device between the steam fresh steam and cold Lin is practical control system, check valve direct acting output of the high pressure cylinder and the hydraulic control system, wherein the check valve is associated with actuator single acting, in-line discharge pressure which is installed shutoff valves with electric drive, and the latter is connected with the electrical control system regulating valves so that the opening of the valves was carried out synchronously with the opening of the control valves.

 

Same patents:

The invention relates to methods for rapid cooldown of the steam turbine high pressure after they are off from work and can be used in power output of steam turbine equipment repair, or a long stop at the conservation equipment

The invention relates to a power system and can be used in steam turbine units (PTU) with reheat steam, as well as in vocational schools without reheat during their reconstruction by supplemental reheat

The invention relates to a power system and can be used in steam turbine plants thermal and nuclear power plants, from which the steam extraction for production needs, desalination plant and for other purposes
The invention relates to thermal energy, and relates to a method of control channel power trigger source of thermal energy (ETHAN), power measurement which is carried out with an accuracy of the greater of 10% but less certain maximum value

The invention relates to a combined gas-steam power plants (cycles), more precisely to a method of operation of combined cycle power plants with steam injection in the gas flow before the turbine

FIELD: heat power engineering.

SUBSTANCE: proposed system consists of steam turbine 1, turbogenerator 2 and boiler. Turbine 1 is opened by acting onto valves 4 using governor 3 governor 3 is set into operation under action of centrifugal pendulum 5, electric motor 6, electrohydraulic converter 7 and manual control mechanism 8. Sensor 9 improves sensitivity of system actuating members. System is furnished also with control pressure sensor 10, controllable opening setter 11 of turbine 1, amplifiers 14 and 15, limiter 16 and proportional differential converter 17. To decrease nonlinearity of "frequency-power" curve of tubular 1 system is furnished with division unit 18, pressure sensor 19 is control stage of high-pressure cylinder of turbine 1, pressure sensor 20 before turbine 1 and change-over switch 21.

EFFECT: provision of automatic control of power of generating unit at considerable reduction of dead zone in frequency and nonlinearity of "frequency-power" curve of turbine operating in network.

3 cl, 1 dwg

FIELD: heat power engineering.

SUBSTANCE: invention can be used in thermal power stations for economic automated control of steam-turbine power-generating units under nominal and sliding pressure conditions. According to invention, regulative valves on lines delivering steam to turbine are kept fully open under all operating conditions of power-generating unit. To change over from one steady-state mode to the other within the limits of rated load, fuel feed regulating valves and feed water regulating valves delivering fuel and water into boiler are acted upon. To change over for load exceeding rated one, regulating valves on lines of steam extraction for regeneration, which are also fully opened, are partially closed. Valves delivering steam to turbine are partially closed for a short period of time when frequency in power supply network deviates from tolerable value, with subsequent return of valves in initial fully open state after setting of frequency within preset limits.

EFFECT: provision of operation of steam-turbine power-generating unit under all loads with minimum losses for steam throttling, materially increased economy of operation.

2 cl, 1 dwg

FIELD: use of oil heat of the coal-pulverizing plant, applicable in heat power engineering.

SUBSTANCE: the method for operation of the thermal power station consists in the fact that steam is produced in the boiler, to this end, coal dust and air are fed to the boiler, coal grinding is accomplished in the coal-pulverizing plant, air heated in the air heater is used as the drying agent, permanent lubrication and cooling of the coal- pulverizing plant bearings are accomplished by oil, which is cooled by passage through an oil cooler. Air picked up from the atmosphere and fed to the boiler air heater is used as the oil cooler cooling medium.

EFFECT: enhanced economical efficiency of the thermal power station.

1 dwg

FIELD: electrical engineering; power supply of communication systems.

SUBSTANCE: proposed plant provides uninterrupted delivery of voltage to load connected to power supply line by connecting power supply line with rotating member with turbine operating to Rankine cycle and connected to device which operates as motor when power supply line supplied voltage to rotate rotating member and generate stored kinetic energy, and operates as generator when power supply line does not operate and rotating member rotates owing to delivery of vapor-like working medium to turbine. Device controls working medium depending of operating conditions of plant in response to losses in power supply line.

EFFECT: improved reliability of power supply of consumer.

8 cl, 7 dwg

FIELD: power unit checking facilities.

SUBSTANCE: proposed system contains current state data acquisition logic unit which receives great number of variable charactering current state of power unit. Logic unit of acquisition of designed constants receives great number of designed constant for power unit. Logic analyzing unit calculates operation efficiency of power unit. Method includes obtaining of great number of current state variable for power unit. Operation efficiency of power unit is evaluated with due account of current state variable and designed constants.

EFFECT: reduced labor input when analyzing efficiency and expenses of power unit.

22 cl, 15 dwg

FIELD: power engineering.

SUBSTANCE: invention relates to hybrid superreliable power generating system. proposed system contains primary power unit generating power and secondary power unit in form of closed-cycle steam turbine capable of generating 100% power generated by primary power unit which is heated at spinning reserve by waste heat of primary power unit where closed-cycle steam turbine is maintained preferably at idling under spinning reservoir conditions. Closed-cycle steam turbine contains burner which burns the same fuel as primary power unit and which products heat sufficient for generating energy equal to 100% of energy delivered by primary power unit to supply load after stopping of primary power unit.

EFFECT: provision of superreliable generation of electric energy.

FIELD: heat power engineering.

SUBSTANCE: invention can be used in designing systems of automatic control of power of steam boiler-turbine power units, both with drum and with straight-through boilers. In power automatic control system with control of power only by boiler regulator (according to open scheme), fuel flow rate corrector is provided in boiler regulator taking into account influence of instability of calorific power of fuel onto generation of power, efficiency of power unit and influence of change of position of regulating valves of turbine in process of power control.

EFFECT: improved quality of control.

2 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: invention is designed to control water temperature in the equipment cooling circuit and can be used in power engineering. The proposed hydraulic device incorporates a heat exchanger and additionally a water heater allowing maintaining the water temperature of up to +35°C and not below a preset level, during the equipment downtime irrespective of the time of year. Note that the said water heater comprises a steam-water heater and multipurpose valves.

EFFECT: keeping equipment safe and sound at low ambient temperatures.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention is related to power engineering and may be used for automatic control of steam-gas plants (SGP) automatic control. According to invention, steam pressure detector is connected to one of SGP capacity controller inlets via differentiator upstream control valves of steam turbine (ST), and generator of anticipatory signal of ST controller is arranged in the form of two summators, to inlets of the first of which, outlets are connected from identifiers of current values of gas turbines (GT) capacities, and to inlets of the other - via damper - identifier of current ST capacity value, outlet of the first summator via another damper and outlet of SGP capacity setting generator.

EFFECT: invention makes it possible to increase quality of control as a result of simplification of SGP control system adjustment and accuracy of control due to the fact that additional signal is sent to ST controller on unbalance between specified and actual capacity of SGP.

6 dwg

FIELD: machine building.

SUBSTANCE: steam turbine plant comprises at least one steam turbine and at least one steam generator to generate steam to actuate steam turbine. Steam turbine plant incorporates at least one bearing structural component that features starting temperature exceeding 250C. Temperature of steam and aforesaid structural component is continuously measured. Steam is fed into aforesaid structural component after starting the turbine. Steam starting temperature is lower than that of structural component, steam temperature being increased with respect to initial transition value. Starting and initial transition temperatures are selected so that structural component temperature change per unit time is lower than preset limiting value. Structural component temperature is, first, decreased to minimum, then it goes up.

EFFECT: fast preparation for starting, reduced thermal structural strain.

12 cl, 3 dwg

Up!