SU1002718A2 - Vertical steam generator - Google Patents

Description

(54) VERTICAL GGROGENERATOR

The invention relates to power engineering and can be used in the design of steam generating plants operating in a variable load mode.

According to the main author. St. No. 853286 is known for a vertical steam generator comprising a housing filled with a heated, medium with a lower economizer and an upper evaporative bundle or heat exchanger tubes included in the heating coolant circulation circuit, a central standpipe mounted in the housing; to the cavity of the body in the zones lying respectively below and above the exon izizernago beam, and the feed pipe forming a jet pump with the central pipe, while outside the feed pipe with a gap relative to it installed. An additional feeding pipe is formed, which forms an additional jet pump with the middle part of the standpipe, the upper end of the standpipe is connected to the housing cavity below the evaporative bundle, and both feeding pipes are equipped with flow rate regulators II.

The disadvantage of the vertical steam generator is its reduced reliability due to increased deposits on the heat exchange tubes.

The purpose of the invention is to increase the reliability of the vertical steam generator by reducing the deposits on the heat exchange tubes. .

The stated goal is achieved by

10 that the vertical steam generator is equipped with a feedwater preparation system and a purge pipeline with outlet and entry sections, the last of which is implemented as a serpentine serpentine located in the gap between the supply pipes and connected to the path of the heated medium between the economizer section and the first jet along the heated medium 20 It is located outside the housing, equipped with a flow regulator and connected to the feed water treatment system.

25

The drawing schematically shows a vertical steam generator.

Claims (2)

The vertical steam generator contains a housing 1 filled with a heated medium with lower ex nomizer and upper evaporative beams, respectively, 2 and 3 heat exchanger tubes connected to the circulation circuit of the heating coolant. In the casing 1 a central lowering is installed on the pipe 4, connected to the cavity of the housing 1 in the zones lying respectively below and above the economizer beam 2, the steam generator also contains a feeding pipe 5 forming the jet pump 4 with the central pipe b. At the same time, an additional feeding pipeline 7 is installed outside the feed pipe 5 with a gap relative to it; the lowering is forming a middle jet with the middle part: 4 additional jet pump 8. The upper end of the lower pipe 4 is connected to the cavity of the body 1 below the evaporation beam 3, and both piping 5 and 7 are supplied with flow regulators 9 and 10. In addition, the vertical steam generator is equipped with a feedwater preparation system (not shown) and a purge piping with outlet and inlet sections 11 12, respectively. The inlet section 12 of the purge pipe is made in the form of a coil located in the gap between the supply pipes 5 and 7 and connected to the path of the heated medium between the economiover section 2 and the first along the heated medium jet pump B. Output section 11 of the purge pipeline It is located outside the building 1, is supplied with a regulator (the flow rate is not shown, and is connected to the feedwater preparation system. Above the evaporative njAiKOM 3 heat-exchange tubes is their superheating bundle 13. The vertical steam generator works as follows. The heating coolant is directed to heat exchange tubes, in which the passage from top to bottom of the overheating, evaporating and economizing bundles, respectively, 13.2 and 3, is cooled, releasing heat from the heated medium circulating in the annular space. v The heated medium is passed from bottom to top successively through the economizer, evaporative and superheater bundles sec. 2, 3 and 13, in which it is heated, evaporated and superheated by washing the heat exchange tubes. The resulting steam is sent to the consumer. Feed water is supplied, depending on the mode of operation of the steam generator, through one of the two pipelines 5 and 7, or through both pipelines 5 and 7 at the same time. At the same time, one of the two or both jet pumps b and 8 simultaneously operate. Due to the operation of one of the two or both jet pumps b and 8 simultaneously, the heated medium is recirculated around the circuit: an ecoulizer beam 2, a jet pump b, a central standpipe 4 and economizer bundle 2. The circulation ratio of the heated medium, necessary for ensuring the hydrodynamic stability of the flow, for a particular load of the steam generator, is set by flow controllers 9 and 10. A portion of the heated medium from the zone of its path located between economizer section 2 and jet pump b is blown into the feedwater preparation system. After cleaning, the water is returned to its cycle. -The execution of the inlet section 12 of the purge pipeline in the form of a coil provides compensation for the temperature expansions of the feed pipeline 7 and the purge pipeline, and the location of this coil.in the gap between pipelines 5 and 7, by cooling the purged heated medium. blowing the heated medium reduces deposits on the heat exchange tubes and thereby increases the reliability of the vertical steam generator. The invention of the vertical steam generator according to ed. EV, no. 853286, in order to increase reliability by reducing deposits on heat exchange pipes, it is equipped with feedwater preparation system and purge pipeline with outlet and inlet sections, the last of which is in the form of a coil, located in the gap between the supply pipes, and connected to the path of the heated medium No. 1 by the economizer section and the first along the heated medium with a jet pump axis, and the outlet section of the purge pipeline is located outside the housing; By flow control and connected to the feedwater treatment system. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 853286, cl. F 22 C 29/12, 1978,