SU1395843A2 - Method of regulating heat load of power-and-heat supply turbine plant - Google Patents

Abstract

The invention makes it possible to increase the efficiency of the turbine operation with the production of steam extraction from the chamber in front of the steam distribution bodies of the medium pressure part connected with the turbine pressure regulator in the production selection line and with the reduction and cooling unit connected to the production line.

Description

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selected and equipped with a proportional-integral pressure regulator. At the maximum opening of the steam distribution bodies 5 and the minimum opening of the steam distribution bodies 13, the t-ru of network water is measured using a thermocouple 31, behind the preheater 30 and compared in the accumulator 36 with the predetermined setpoint 35, and this preset value, steam access to the regenerative heaters 15 is covered. When the steam distribution bodies reach 7 times the average pressure

at a given pressure in the production selection opening set up by element 45, a signal is sent to the switch 9 from the mechanoelectric sensor 9. As a result, the connection between the turbine pressure regulator t1 and the organs 7 is broken, which prevents them from opening in the process of further shutdown of the regenerative iodine heaters. The displaced of the last pairs enters the production selection, is forced out, in turn, the steam consumption from the reduction-cooling unit. 1 silt

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The invention relates to a power system, can be used in the operation of heat and power plants with heating and steam production and is an improvement of the regulation method according to the main machine, No. 1134737,

The purpose of the invention is to increase the efficiency of the turbine operation with the production of steam from the chamber in front of the steam distribution bodies of the medium pressure part connected with the turbine pressure regulator in the production selection line and with the reduction and cooling unit (DOW) connected to the production selection line and equipped with proportional integral pressure regulator.

The drawing shows a diagram of the implementation of the method for an unrelated control system.

The heat-generating installation working on the production selection (line 1) in parallel with the DOC 2, controlled by the regulator 3 with the proportional-integral pressure regulation law, contains a turbine, consisting of high pressure cylinder 4 with steam distribution bodies 5 high pressure parts and mechano-electric sensor 6 of their position, steam distributing bodies 7 parts of medium pressure with control mechanism 8 and mechano-electric sensor 9 of its position, switch 10 for equalization of the connection between steam distribution agencies 7 and turbine controller 11

5 pressure, low pressure cylinder 12 with steam distributors 13 low pressure parts and mechano-electric sensor 14 of their position, regenerative heaters 15 with a control unit 16 for switching off regenerative heaters 15 by acting on a valve 17 equipped with an electric actuator 18 and a limit switch 19 and installed on the pipeline 20 for supplying steam to the heaters 15, or by acting on the gate valves 21 and 22, equipped with electric actuators 23 and 24 and a limit switch 25 and mounted on the pipeline 26 supplying feedwater to the heaters 15, and a valve 27, equipped with an electric actuator 28 and installed on the feedwater bypass pipeline 29, in addition to the regenerative heaters 15, heating water heater 30, thermocouples 31 and 32 for measuring the temperature of the network water passing through

pipeline 33. 30

The mains water is heated in accordance with the heating network schedule in the heater 30 and the peak boiler 34.

Setting the temperature of the mains water at which the

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heaters 15, produced in n t

is driven by the setting device 35.

The control unit 16, which compares the current value of the temperature of the network water and the setpoint output signal -35 measured by the thermocouple 31 and 32, contains an adder 36, which leads the signals from the thermocouple and the setter to the same algebraic complex of the converted signals, and a relay element 37, triggered by the equality of these signals. In control unit 16, there are two more relay elements 38 and 39, to the input of which signals from sensors 6 and 14 are applied, respectively, of the superposition of steam distribution bodies 5 and 13. The activation of the relay element 38 occurs when the high pressure part of the steam distribution organs opens element 39 — with a minimum opening of the steam distribution organs of the low pressure part. The relay elements 37-39 are connected to the element AND 40 so that only when all three relay elements are triggered, the actuators of the valves 17 or 21, 22 to 27 are started. The starting circuit of the actuators of the valves also includes a 4T switch, which serves to stop the circuit from signals from the limit switches of the valve 17 or one of the valves 21 22, 27 and from the relay 42, controlled by the adder 43, comparing the temperature of the network water behind the peak boiler and before it, measured by thermocouples 31 and 32. The limit switches and the relay 42 are connected to the IL element And 44 so that the rupture of the control circuit of the electric actuators of the valves occurs when the equality of the temperatures of the supply water before and after the peak boiler is reached, or when the valves 21, 22 and 27 reach a predetermined position corresponding to the full or partial disconnection of the regenerative heaters.

The breakdown of the connection by the switch 10 between the steam distribution bodies 7 of the medium pressure part and the turbine pressure regulator 11 occurs according to a signal from the mechanoelectric sensor 9 of the mechanism 8 of the control of the steam distribution bodies 7 of the medium pressure when the latter reaches its maximum opening at a given selection pressure,

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The setting of the switch 10 to operate at a given pressure is made by the tuning element 45 (for example, of the screw-nut type) by displacing one of the sensor elements (for example, the flow slider) relative to the control mechanism 8.

This operation is configuration, not operational, since for production selection, unlike heating selection, the target pressure for each particular object remains practically unchanged during operation.

The method is carried out as follows.

At the maximum opening of the steam distribution bodies 5, which is fixed by the sensor 6, their position and transmitted to the relay element 38 of the control unit 16, and the minimum opening of the steam distribution bodies 13, which is fixed by the sensor 14 of their position and transmitted to the relay element 39 of the control block 16, the network temperature is measured water using a thermocouple 31 for the heater 30 and compare it in the adder 36 with a given unit 35 value. When the temperature of the mains water is equal to this setpoint, the steam access to the regenerative heaters 15 is blocked by acting on the actuators 36 on the actuators of the valves 17 or 21, 22, 27.

If in the process of disconnecting the regenerative heaters, the steam distribution bodies 7 of the average pressure part reach the maximum at a given pressure in the production take-off, set up by element 45, then the signal from the mechanical-electric sensor 9 goes to the switch 10, as a result of which the connection between the turbine pressure regulator 11 and steam distribution bodies 7 parts of the average pressure, which excludes their opening in the process of pressing off the regenerative heaters. The steam that is displaced from regenerative heaters enters production selection, and, in turn, is replaced by steam flow from a DOC. The DOC regulation, performed according to the proportional-integral1) to Nom. Law, maintains a given pressure in the selection.

The action of the scheme to stop the heaters in this case occurs only when the valves of the heaters 15 reach the maximum permissible position according to the signal from the end switch 19 or 25, which affect the element OR 44 ,,

If the maximum permissible condition of the steam distribution parts 7 in terms of the capacity of a part of the average pressure coincides with their design, then the connection between the turbine regulator and the steam-J5 distribution system of the CHSD is disconnected.

Thus, the proposed method, by pushing 20 regenerative steam heaters of the DOC into a feast, allows an increase in the power of the turbine, based on the heat consumption, and results in fuel savings at the CHP plant under conditions of a limited flow capacity of a portion of the average pressure of the turbine.

Claims (1)

Invention Formula The method of regulating the heat load of the heat turbogeneration plant according to avt.ev, No. 1134737, characterized in that, in order to increase the efficiency of the turbine operation with the production of steam from the chamber in front of the steam distribution bodies, the parts of average pressure connected to the turbine pressure regulator in the production line with a reduction and cooling unit connected to the production selection line and equipped with a proportional-integral pressure regulator, the degree of opening is additionally measured whith the steam distribution organs portion medium pressure and upon reaching the maximum pressure for a given production line the selection of degree of opening allowed bond steam distribution bodies part turbinnmd medium pressure with a pressure regulator B production line selection.