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Steam generator concept of a small HTR for reheating and for removal of the residual heat

Abstract

The steam generator of a small HTR is arranged above the core in an in line design of the primary loop, thereby helium flows upwards. Water flows downwards in the steam generator to realize cross flow. To achieve stable evaporation conditions during part load operation it is desired to realize upward evaporation in the steam generator. Moreover if the steam generator is also used as a heat sink for removal of residual heat, this desire of upwards evaporation becomes more imperative. It is possible to realize the design of steam generator with upwards evaporation by arranging a hot gas duct in its central region, so that hot helium can flow upwards through it. Therefore helium enters the steam generator from the top and flows downwards and water upwards. In the presented design, a heat exchanger is arranged in the central region of the steam generator instead of a hot gas duct. Hot helium of 750 deg. C flows upwards in this heat exchanger and thereby cools down to the temperature of about 700 deg. C before it enters the bundle of the steam generator at the top. Through an intermediate loop this heat is transferred outside the primary loop, where  More>>
Authors:
Singh, J; Barnert, H; Hohn, H; Mondry, M [1] 
  1. Institut fuer Reaktorenentwicklung, Kernforschungsanlage Juelich GmbH, Juelich (Germany)
Publication Date:
Jul 01, 1988
Product Type:
Conference
Report Number:
IWGGCR-15
Reference Number:
EDB-01:001760
Resource Relation:
Conference: Specialists' meeting on technology of steam generators for gas-cooled reactors, Winterthur (Switzerland), 9-12 Mar 1987; Other Information: 4 refs, 2 figs, 3 tabs; PBD: 1988; Related Information: In: Technology of steam generators for gas-cooled reactors. Proceedings of a specialists' meeting, 236 pages.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; AFTER-HEAT REMOVAL; DUCTS; GAS FLOW; HEAT EXCHANGERS; HEAT TRANSFER; HELIUM; HTTR REACTOR; PERFORMANCE TESTING; REACTOR SHUTDOWN; RELIABILITY; STEAM GENERATORS
OSTI ID:
20113030
Research Organizations:
International Atomic Energy Agency, International Working Group on Gas-Cooled Reactors, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA0056047057148
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 141-146
Announcement Date:

Citation Formats

Singh, J, Barnert, H, Hohn, H, and Mondry, M. Steam generator concept of a small HTR for reheating and for removal of the residual heat. IAEA: N. p., 1988. Web.
Singh, J, Barnert, H, Hohn, H, & Mondry, M. Steam generator concept of a small HTR for reheating and for removal of the residual heat. IAEA.
Singh, J, Barnert, H, Hohn, H, and Mondry, M. 1988. "Steam generator concept of a small HTR for reheating and for removal of the residual heat." IAEA.
@misc{etde_20113030,
title = {Steam generator concept of a small HTR for reheating and for removal of the residual heat}
author = {Singh, J, Barnert, H, Hohn, H, and Mondry, M}
abstractNote = {The steam generator of a small HTR is arranged above the core in an in line design of the primary loop, thereby helium flows upwards. Water flows downwards in the steam generator to realize cross flow. To achieve stable evaporation conditions during part load operation it is desired to realize upward evaporation in the steam generator. Moreover if the steam generator is also used as a heat sink for removal of residual heat, this desire of upwards evaporation becomes more imperative. It is possible to realize the design of steam generator with upwards evaporation by arranging a hot gas duct in its central region, so that hot helium can flow upwards through it. Therefore helium enters the steam generator from the top and flows downwards and water upwards. In the presented design, a heat exchanger is arranged in the central region of the steam generator instead of a hot gas duct. Hot helium of 750 deg. C flows upwards in this heat exchanger and thereby cools down to the temperature of about 700 deg. C before it enters the bundle of the steam generator at the top. Through an intermediate loop this heat is transferred outside the primary loop, where in an extra heat exchanger live steam is reheated to improve the thermal efficiency of the plant. This intermediate loop works on the basis of forced convection and transfer about 25 MW for reheating. During the shutdown operation of the reactor, this heat exchanger in the central region of the steam generator serves as a heat sink for removal of the residual heat through natural convection in the primary loop. At the same time it is further possible, that intermediate loop also works on the basis of natural convection, because during shutdown operation only a very small amount of heat has to be removed and moreover the outside heat exchanger can be arranged much higher above the central heat exchanger to get favourable conditions for the natural convection. Some of the highlights of the central heat exchanger are: coaxial straight tubes with inner pigtail for transport of the hot intermediate medium; on the primary helium side baffles are arranged to increase heat transfer coefficient; this bundle of tubes can be inspected in situ without opening of the primary circuit to improve its reliability. (author)}
place = {IAEA}
year = {1988}
month = {Jul}
}