SU373442A1 - BIOLIO "1'D''A - Google Patents

Description

one

Power plants are known for low-boiling substances with separate vapor and gas circuits and combined regeneration.

In order to increase the efficiency in the nominal and variable modes in the proposed installation, the steam circuit is connected to the gas through a heater and one of the regenerators.

The feed pump is designed to be driven by a low-pressure steam turbine, which also makes it possible to ensure high efficiency of installation in variable conditions.

FIG. 1 shows a diagram of the proposed installation; in fig. 2 - the same for high power units (more than 1.000.000 kw); in fig. 3 - T-5 diagram of the plant operation cycle.

The installation contains a condenser /, regenerators 2-4, pre-gas cooler-heater 5 condensate, compressor 6, steam turbines 7 and 8 of high and low pressure, respectively, gas turbine 9, electric generator 10, reactor or boiler 11, start-up engine 12 and feed pump 13. For large-capacity units, the plant additionally includes an intermediate superheat and an additional turbine 7a of useful power.

The installation works as follows.

Pre-gas cooler heat reject gas

5 enters the compressor 6 and after compression therein through the gas regenerator 4 is supplied

in the reactor 11. Heated to the initial temperature, it enters the gas turbine 9, which rotates the electric generator 10, and then again into the regenerator 4 and cooler 5. Compressor

6 is driven by a high-pressure steam turbine 7 receiving superheated

steam from the reactor (boiler) //. After expansion in the turbine 7, the steam enters the low-pressure steam turbine 8, which rotates the feed pump 13, and then through the steam regenerators 3 and 2 to the condenser /. After cooling and condensation, the working medium of the steam circuit in the liquid state is supplied by the feed pump to the first stage of the regenerators, consisting of the condensate preheater 2 and the preliminary gas cooler 5. Then, in the supercritical state, it is heated in the steam regenerator 3 and the reactor 11.

When the electrical load changes, the speed regulator on the shaft of the gas turbine 9 changes the supply of fuel to the boiler 11 (or heat release in the reactor) with a simultaneous change in the pressure of the working fluid in the gas circuit. In the steam circuit at the first moment

turbine power is reduced due to temperature change (until the weight of the working fluid through the reactor changes). The rapid change in the power of the low-pressure turbine (it is located at the end of the expansion process) causes a change in the number of revolutions of the feed pump 13, the pressure and the flow of the working fluid to the boiler 11.

Kpd Installing the prn reducing load varies very hollow. Reduced efficiency it is associated only with a decrease in the upper pressure in the steam circuit and an increase in the energy consumption for own needs.

The a-b-b-d-d-e-zh (see Fig. 3) diagram characterizes the process occurring in the steam circuit. The cycle and-to-l-m-n-o- and gas circuit can “slide relative to the axis (see the position of i-to-l-m-n-o-i). This is possible both when designing and when changing the operating mode of the installation.

Subject invention

1. Energy installation on low-boiling substances with separate steam and gas circuits, a system of regenerators and heaters and a feed pump in the steam circuit, characterized in that

increasing efficiency in nominal and variable modes, the steam circuit is connected to the gas through a heater and one of the regenerators. 2. Installation under item 1, characterized in that,

In order to further improve efficiency in variable conditions, the feed pump is designed to be driven by a low-pressure steam turbine.