SU1173048A1 - System for automatic control of central heat supply turbine plant - Google Patents

Abstract

AUTOMATIC REGULATION SYSTEM OF HEATING TURBO INSTALLATION with fresh water heating in a condenser equipped with supply and discharge pipelines of fresh and circulating cooling water, containing a steam inlet regulator, a steam pressure regulator in an adjustable steam extraction, the inlet is connected to a steam pressure sensor in a voltage source. with an input of a pulse integration unit having a limiting unit with two-way switches, More and Less and a selection control unit, a water temperature regulator on the output from the condenser, the inlet of which is connected to the water temperature sensor at the outlet of the condenser and the output of the pulse integration unit, and the output to the inlet of the latter and the regulator of selection, characterized in that, in order to increase the available electrical power of the turbine unit, the system further comprises the regulator on the pipeline of discharge of circulating cooling water, equipped with an actuator with a limit switch, and two intermediate relays, i with the output of the temperature regulator connected through the closing end (L clock of one of the intermediate relays connected to the on-off switch with the More switch, with the actuator of the regulator on the drain line, and the opening contact of the other intermediate relay connected to the limit switch is connected between the -h input of the pulse integrator and the output of the temperature controller in the circuit is Less than the last. 4 00

Description

The invention relates to a power system and can be used in the automation of heating plants.

The aim of the invention is to increase the available electrical. power of heat-recovery turbine unit.

The drawing shows a diagram of a specific system design.

The system contains a steam pressure regulator 1 in an adjustable selection of a turbine unit, the input of which is connected to a steam pressure sensor 2 in a selection, and a circuit output More to the pulse integration unit 3 through a contact 4p relay connected to the two-position switch 5 Less than the power limitation unit 6 of the pulse 3 unit integration. The output of the pressure regulator 1 on the More and Less circuits is also connected to the selection regulator 7 through the open contacts of the relay 4. The system also contains a water temperature regulator 8, the input of which is connected to the water temperature sensor 9 after the condenser and block 3, and the output on More and Less chains - with the regulating authority 7 of selection through the closing contacts of the relay 4 and with the executive mechanism 10 of the regulating authority on the pipeline to drain the cooling water from the condenser to the circulating supply system through the closing contacts an intermediate relay 1J connected to the two-position switch t2 More block 6 through the disconnecting contacts of the intermediate relay 13 triggered by closing the limit switch 14 of the actuator 10. The system also includes a power regulator 15, the input of which is connected to the generator power meter 16 and the output - with regulator 17 of the steam turbine inlet.

The system works in the following three characteristic modes with automatic transition from one mode to another, and in the 1st and 11th modes, the latter works as the system is known.

1st mode. When the water temperature reaches the value of the lower (upper) or more (less) lower (upper) limit of

range of water temperature, the opening contacts of the relay 4 connect the pressure regulator 1 over the More and Less circuits to the selection regulator 7, and the temperature regulator 8 along the More and Less circuits - to the pulse integration unit 3. The output circuits of the power controller 15 are connected to

Regulatory body 17 steam start. In this case, as in other modes, the regulation of electric power is carried out autonomously. In this mode, the load is controlled selection

is satisfied at a predetermined level, whit4; m, the temperature of the water leaving the condenser, while remaining within the allowable range, increases with decreasing electrical load and vice versa.

C-th mode. When the water temperature reaches the value equal to or less than the lower limit of the specified temperature range.

water, at the command of the restriction unit 6, closes the contact of the two-position switch 3 Less, which triggers the relay 4. Pressure control regulator 1

More or Less is disconnected by the opening contacts of the relay 4 from the selection regulator 7, and by the More circuit is connected by the closing contact of the relay 4 to the pulse integration unit 3. The Simultaneously closing contacts of the relay 4 are connected to the temperature controller 8, along the More and Smaller circuits to the regulator 7 selection.

The output circuits of the power controller 15 are connected to the regulator 17 of the steam inlet.

The considered operating mode of the regulators 1, 8 and 15, while maintaining the specified electric power, is best satisfied by thermal consumers, since the water in the condenser is heated to the minimum acceptable level, and

the entire remainder of the steam is sent to a controlled selection. In the transition to: 1st mode, the switching of the output circuits of the regulators 1 and 8 occurs in the reverse order, i.e. the output circuits of the regulators 1 and 8 contacts of the relay 4 are connected respectively to the regulating authority 7 of selection

and a pulse integration unit 3.

111th mode. When the water temperature increases due to an increase in steam admission to the condenser, caused by an increase in the electrical load of the turbine installation without changing its heat load, and when the water temperature reaches or exceeds the upper limit of the specified range of water temperature, at the command of block 6, the contact of the two-position switch 12 More that leads to the operation of the relay 11. The temperature controller 8 over the More and Less circuits is connected with the closing contacts of the relay 11 to perform regulator mechanism 10, and along the circuit is less disconnected from the pulse integration unit 3 by the opening contact of the relay 13, which is activated by closing the limit switch 14 of the actuator 10.

The temperature controller 8 increases the flow rate of water through the condenser.

increasing the degree of opening of the regulator on the pipeline to drain the cooling water into the circulating water supply system, which leads to a decrease in water temperature.

Due to this, in contrast to the turbo installation mode equipped with a known system, there is no need to reduce the electrical load and the available electrical power of the turbo installation increases.

Fresh water discharged into the circulating system from the condenser feeds the circulating system. At the same time, the intake of cold fresh water for feeding should be reduced accordingly, for example, in the process of adjusting the water level in the cooling tower bowls. Excess feeding of the circulating system through the capacitor in the Iff mode can be used to increase the electrical power at the maximum of the electrical loads of the power system due to the subsequent decrease in the feeding of the circulating system.

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Claims (1)

AUTOMATIC REGULATION SYSTEM FOR HEAT TURBO TURBO INSTALLATION with fresh water heating in a condenser equipped with fresh and reverse cooling water supply and drain pipelines, containing a steam inlet regulator, a steam pressure regulator in an adjustable steam outlet, the input of which is connected to the steam pressure sensor in the outlet, and the outlet - with the input a pulse integration unit having a restriction unit with on / off switches '' More and Less and a regulating body for selection, a regulator of the water temperature at the outlet of a sensor, the input of which is connected to a water temperature sensor at the outlet of the condenser and the output of the pulse integration unit, and the output - to the input of the latter and a regulating selection body, characterized in that, in order to increase the available electric power of the turbine, the system additionally contains a regulating body on the pipeline discharge of reverse cooling water, equipped with an actuator with a limit switch, and two intermediate relays, while the output of the temperature controller is connected through a closing having the contacts of one of the intermediate relays connected to the on / off switch More, with the actuator of the regulator on the drain pipe, and the opening contact of the other intermediate relay connected to the limit switch is connected between the input of the pulse integrorania unit and the output of the temperature controller in the circuit Less than the last. e