SU642493A1 - Power plant - Google Patents

Description

(54) POWER INSTALLATION

The invention relates to the field of heat and power engineering and is intended to regulate the temperature of the secondary superheated steam in the startup modes of power plants with intermediate steam superheating.

Power plants are known that include a boiler with an intermediate superheater of steam, connected by a steam supply pipe to the exhaust pipe of a high pressure cylinder (HPC), and a drain pipe on which the desuperheater is installed, to a steam inlet body of a medium pressure cylinder (CDS) 1.

The disadvantage of such an installation is the low quality of the regulated temperature of the secondary superheated steam at low speeds, it is possible that the steam pipelines after the cooler are rapidly cooled and moisture is drained into the flow section of the CCD.

Power plants are also known, which contain an intermediate superheater and a duct overflow pipe, which are connected in parallel between high and medium pressure cylinders, an external source of steam and feedwater path 2 ..

When increasing the rotor rotation frequency and generator synchronization, the temperature of the steam mixture before the DRC changes slightly, due to low flow rates and high steam temperature beyond the high-pressure cylinder, which limits the steam temperature control range of the CCD. Removing a portion of the steam through the steam transfer pipe reduces the steam consumption through the intermediate superheater, which reduces its reliability.

The aim of the invention is to expand the range of control of the temperature of the secondary superheated steam and increase reliability.

The goal is achieved by the fact that an ejector is connected to the steam bypass pipe, which is connected to pipelines with control valves through an ejecting medium with an external source of steam, and through an ejection source with a feedwater path.

Claims (2)

In the drawing, a diagram of a power plant with a continuous-flow steam generator is shown. The installation contains a boiler unit with a pair of 1 and an alternate 2 parts, separated by a built-in valve 3, the bypass of which includes a separate separator 4. Between the cylinder Zdram high (CVP) b and medium (CCD) 7, the pressure is connected in parallel iiporvtej day1- The first steam superheater8 and steam supply pipe 9, and subsequently, an ejector 10 is connected, communicating via an ejecting medium with a steam and f 4 source 11, a pair of pipeline 12 with a regulating valve 13, and through an ejecting fluid through a nutrient path 14, using a spring, 14, a spout of the valve, and a section of the section of the flow section of the system. j pytaselo pasas 15, pipe 16 with adjusting KJsananoM 17 regulators. Regulators kpapans 13 and 17 are equipped with regulators 18 and 19, to which the setpoint 20 and 21 are connected. Regulator 18 receives Julg / Lsa, often characterizing the main criteria of turbine reliability, and regulator The torus 19 is a pressure pulse and a temperature pulse in a pair of pipelines 9 behind the ejector 10. The power plant operates in a smooth way. The start-up zone | P | 5operations after reaching the required steam parameters for the boiler unit by supplying steam to the HPC 6, after which steam through the heating agent and the steam superheater 8 enters the central heating system 7. To regulate the temperature of the second superheated steam before the SDC 7 steam from an external source 11 via line 12 of noctynaet to the ejector 10 k sucks a portion of the steam sent to the intermediate converter. Feed water from the intermediate stage of the hygienic pump 15 is injected into the steam mixture in the narrow section of the ejector 10, the flow rate of which is controlled by the valve 17 by means of the regulator 19j maintaining a certain ratio S of the temperature difference saturation at the pressure for the ejector 10 and the steam tehlurerature of the IBIM, which provides certain overheating of steam behind the ejector 10. The cold steam flow after the ejector 10 is replaced with hot steam coming in from the interval, the heater 8, and as a result, the required change is mperatury steam before DRC 7. The required steam temperature daashzon izmenega Before IPC 7 is determined by reliable detection criterion turbine. In the period when, under the conditions of ensuring the reliability of the intermediate superheater 8, all the steam after the cylinder 6 must be directed to overheating, the valve on the bypass 9 pipe closes, and the steam flow required for the regulation enters the ejector 10 from an external source P. the possibility of a nocTeneiffioro in determining the temperature of the steam in front of the CCD by acting on the regulator 18 to close the control valve 13. After the control valve 13 is completely closed, the control valve 17 closes and corresponds etstvuyuscha stop valves in pipelines 9, 12 and 16. Further start znergetaadskoy installation are produced in a conventional manner. Thus, in the proposed power plant, the temperature of the secondary superheated steam is reliably controlled at any stage of the start-up, regardless of its flow rate, which increases the reliability of the plant and its maneuvering characteristics. Invention Energy, an installation containing an intermediate superheater to the steam bypass pipe connected in parallel high and medium pressure shredder, extraneous isotope steam and feedwater path, characterized in that D {w vtoretno range temperature control of superheated steam and increasing nadezhnostnogo in paroperenusknoy conduit included ejector, which is connected with piping regulator $ ruyusch shek klapanash by ezhekgiruyuschey medium istochyuzhom extraneous steam, and in the ejected - from the feedwater path. Sources, information taken into account expertise. . The development of power units. Start-ups, meall, water treatment and automatics M., SEI, 1971, p. 33. 2. Types of Istruksch1 on start-up from various thermal plants and shutdown of a 200 MW monoblock with a boiler W-100, M., SPO ORGRES, 1977.