SU985335A1 - Heat generating power plant operation method - Google Patents

Description

one

The invention relates to a power system and can be used in power plants with heat and steam-turbine installations, in which process water is heated in condensers.

There are known methods for operating power plants in which process water is heated in condensers or in built-in capacitor beams with a fully closed control diaphragm of the heating selection.

A disadvantage of the known method is that it is not possible to maintain the desired temperature of the technological Kbi exiting the condenser or embedded in the beam capacitor.

There is also known a method of operating a heat and power plant in a heat and power plant by supplying a portion of steam from a heat recovery plant through a regulator body

LOW pressure in the condenser for heating in the last process water with simultaneous temperature control by the last change in steam consumption 2.

This method does not provide the necessary precision in adjusting the temperature of the process water, since there is little movement of the rotary diaphragm servomotor (regulator), which has a lower cross-sectional area, the steam consumption increases significantly. The lack of accuracy in controlling the temperature of the process water leads to a decrease in the reliability of chemical water cleaning. .

The purpose of the invention is to increase the reliability and accuracy of adjusting the temperature of the process water.

Claims (2)

This goal is achieved by setting the regulator of the low pressure part b to a constant fixed position, and the change in steam flow rate is made by additionally bypassing the low pressure part. The drawing shows a diagram of a thermal power plant for carrying out the proposed method. ba The heat and power installation includes a high pressure cylinder 1, a part 2 of medium pressure (CHSD), a regulator (regulating rotary diaphragm) 3 of part 4 nor; Whose pressure (PND) and condenser 5. The heat extraction selection, located between CHSD 2 and PND 4 (not shown) in front of the regulator 3, is connected to the condenser 5 by a bypass pipe 6 containing the temperature regulator 7. The built-in beam 7 of the condenser 5 is connected to a chemical water treatment 9. A sensor 11 of the temperature controller 7 and a pump 12 are installed at the outlet of the built-in 8 beam 10. The method of operation of the heat and power plant is as follows. In the bundle 8 embedded in the condenser 5, the raw process water is fed to the chemical water treatment 9 by the pump 12. The regulator 3 is set to a permanently fixed position (on the stops), i.e. Regulatory body 3 PND 4 can be closed partially or completely and fixed in one of these positions. Regulating the same, the optimum temperature of the process water is produced by varying the steam flow by additionally circulating LPI 4 through the bypass line 6 by temperature regulator 7 in accordance with the pulses supplied by sensors 11. Since the temperature regulator has a cross section corresponding to the regulated steam flow rate, the temperature control accuracy can be carried out in almost any necessary limits. Improving the accuracy of temperature control allows to increase the reliability of chemical cleaning. In addition, the coagulation of water in front of the water cleaning filters is improved, the amount of filter regeneration is reduced, the water cleaning performance is improved, and the anion exchange resin life is improved. In this case, the supply of steam to the condenser in addition to the PND will not lead to a decrease in the efficiency of the turbine installation, since when operating in the heat-extraction mode (low steam conditions) the PND power does not depend on the steam consumption. Claims The method of operating a heat and power plant in a heat recovery mode by supplying part of the steam from the heat recovery selection through the regulator of a low pressure part to a condenser for heating in the last process water while simultaneously controlling the temperature of the last change in steam flow, in order to increase reliability and the accuracy of adjusting the temperature of the process water is established by the regulator of the low pressure part. at a constant fixed degree of creep, and the change in steam consumption is made by additionally circulating a part of the low pressure. Sources of information taken into account in the examination 1.Benenson B.I., Ioffe L.S., Heating steam turbines. M., Energie, 1976, p. 115 2. Turbine steam PT-80 / 100-130 / / 13. TU 24-2-4O9-73. 1973, p. 14.