Steam-turbine power-generating unit automated control method

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

 

The invention relates to a power system and can be used in thermal power plants for cost-effective automated control of the steam-turbine units in the nominal modes and sliding pressure.

Known taken as a prototype of the proposed technical solution method for the automated control unit, equipped with a steam boiler, a steam turbine system and a regenerative feedwater heating boiler selected steam turbine control valves for the supply of feed water and fuel in the boiler, steam turbine and shut-off valves on the lines of the selection of steam for regeneration, providing the power unit to the grid in the nominal modes and sliding pressure with the formation of the control signal in accordance with changes in the load mode and the deviation from the setpoint frequency power [1]. In accordance with [1] the work of the unit at all steady-state conditions, including nominal, is not fully open the valves on the lines of the steam supply to the turbine to allow, if necessary lifting power above rated upon further opening of the valve. The constant work of a steam turbine with a partially covered by a valve on the steam inlet to the turbine because of dresselian the pair of leads to unnecessary loss of efficiency of the unit not only in the short-term, transitional but in the steady-state operating modes.

Achievable technical result of the invention is to improve the efficiency of automated control of a steam-turbine unit.

This result is ensured by the fact that in the way of automated control unit, equipped with a steam boiler, a steam turbine system and a regenerative feedwater heating boiler selected steam turbine control valves for the supply of feed water and fuel in the boiler, steam turbine and shut-off valves on the lines of the selection of steam for regeneration, providing the power unit to the grid in the nominal modes and sliding pressure with the formation of the control signal in accordance with changes in the load mode and the deviation from the setpoint frequency power, according to the invention additionally regulating valves equipped line of steam extraction from the turbine regeneration system when the transition from one steady state to another within the rated load affect control valves fuel and feed water into the boiler, leaving a completely open the valve to supply steam to the turbine and on the specified lines of steam extraction, if necessary, a rapid transition in the acceptable range for the load above hominalnoe cover control valves on the lines of steam extraction, regulating the valve in the line supplying steam to the turbine cover only briefly when the frequency in the grid return valves in the original fully open state after setting the frequency in the specified range.

In the drawing, as an example, shows thermal circuit of the steam turbine unit with an automated control system, operating according to the method according to the invention.

The unit contains a steam boiler 1 is connected by a steam line 2 with a steam turbine 3, mounted on a common shaft 4 is connected to an electrical outlet (not shown) of the generator 5 and the capacitor 6 pair connected to the boiler 1 through consistently included in line 7 regenerative feedwater heater low pressure (PLP) 8, pump 9 and regenerative high pressure heater (HPH) 10. Included in the system of regenerative feedwater heating (system recovery) PND 8 and 10 EDT mounted on the heating side to the lines 11, 12, respectively, low and high pressure extraction steam from the turbine 3. The boiler 1 is also equipped with line 13 fuel supply. On the above lines, steam turbine, steam extraction, feed water and fuel installed control valves respectively 14-18. On the lines 2,11,12 installed shut-off valves according to the respectively 19-21. Control valves 15,16 lines 11,12 can run and stop functions, and therefore from the shutoff valves 20,21 to reduce the pressure loss is in principle possible to refuse.

The automatic control unit includes a controller 22 of the power and the regulator 23 frequency of AC power. To one input of the regulator 22 connected unit 24 power, and to the other input - single output controller 23 through the logical link 25 delay time. The output of the controller 22 is connected to the actuator (not shown) regulating valve 18 on line 13 fuel supply to the boiler 1 through functional Converter 26 to the control valve 17 in line 7 of the feed water. The input of the regulator 23 is connected to the sensor 27 frequency of rotation of the shaft 4, which coincides with the frequency connected to the generator 5 to the outlet. The output of the controller 23, in addition to the logical link 25 delay time is connected directly to the actuators of control valves 15 and 16 on the lines 11,12 selection of steam for regeneration.

The method according to the invention using the above-described automated control system for a steam turbine power generating unit is as follows. Control valves 14 on line 2 of the steam supply to the turbine 3 in all steady-state and transient modes of sliding pressure is oderzhivayut fully open. Control valves 15, 16 also supports a fully open when the loads within the rated. For the transition from one steady-state load mode to another at loads within the rated effect by means of the controller 22 of the power control valves 17 and 18 fuel and feed water into the boiler 1. If necessary, a rapid transition in the acceptable range for the load above the rated value cover control valves 15, 16 on lines 11, 12 selection of steam for regeneration. Control valves 14 together (within rated load) with regulating valves 15,16 include work short-term (within a fraction of a second to several seconds) and with a small amount of regulatory impact only when the output frequency within the permissible limits in the process of frequency control in the power control 23. After the termination of the regulatory impact on the frequency of these valves are returned to their original fully open state. If the duration of the signal from the sensor 27 frequency exceeds the limits, the logical element 25 of the time delay, opens the regulating effect of the controller 22 of the power control valves 17, 18 and 15, 16.

Ensuring the operation of the steam turbine unit at all load conditions with minimal losses is on the throttle a pair of substantially increases the efficiency of his work.

Sources of information

1. RU # 2031212, 6 F 01 TO 7/24, 1992.

The method of automated control unit, equipped with a steam boiler, a steam turbine system and a regenerative feedwater heating boiler selected steam turbine control valves for the supply of feed water and fuel in the boiler, steam turbine and shut-off valves on the lines of the selection of steam for regeneration, providing the power unit to the grid in the nominal modes and sliding pressure with the formation of the control signal in accordance with changes in the load mode and the deviation from the setpoint frequency in the outlet, characterized in that it further regulating valves equipped line of steam extraction from the turbine in the regeneration, when moving from one the established mode to another within the rated load affect control valves fuel and feed water into the boiler, leaving a completely open the valve to supply steam to the turbine and on the specified lines of steam extraction, if necessary, a rapid transition in the acceptable range for the load is higher than the nominal cover control valves on the lines of selecting a pair of regulating the valves to supply steam to the turbine cover only short-term regulation is often what s in the outlet with return valves in the original fully open state after setting the frequency in the specified range.



 

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