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Vertical multiple passage drainable heated surfaces with headers-equalizers and forced circulation

a technology of forced circulation and drainable heated surfaces, applied in the field of heated surfaces, can solve problems such as reducing corrosion, and achieve the effects of improving the stability of flow and temperature regime of tubes, increasing steam/water mass velocity, and reducing multivalues

Inactive Publication Date: 2016-04-14
POLONSKY VLADIMIR S +1
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  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text describes a design for heat exchangers that improves the flow and temperature of steam or steam-water mixtures. The design also reduces corrosion and improves the stability of the flow. Additionally, the design allows for the drainage of water from the bottom of the exchanger using connected holes and pipes. This helps to decrease the formation of fouling and the uneven distribution of flow between parallel tubes. Overall, the design improves the performance and reliability of heat exchangers.

Problems solved by technology

Besides such design of HS noticeably decreases the corrosion when the units are not in operation.

Method used

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  • Vertical multiple passage drainable heated surfaces with headers-equalizers and forced circulation
  • Vertical multiple passage drainable heated surfaces with headers-equalizers and forced circulation
  • Vertical multiple passage drainable heated surfaces with headers-equalizers and forced circulation

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Embodiment Construction

[0019]All types of thermal power plants are emitting a lot of waste heat into the atmosphere. To improve the thermal efficiency and decrease carbon dioxide emissions a noticeable portion of waste heat can be captured and used for the different goals. Let's consider the issue in the context of Combine Cycle Power Plants (CCPP) as one of the most effective cycles in power industry. In this case the heat of exhaust gas after gas turbines (GT) can be used in heat recovery steam generators. The steam after HRSG goes into steam turbine (ST) which drives electrical generator. The thermal efficiency of such combined cycle (Brayton and Rankine cycles) can be above 60%. In contrast a single ST cycle of subcritical pressure is limited around 40%, the best modern GTs have thermal efficiency about 45%. The modern units with ST cycle of supercritical pressure have achieved 43-44%. In this respect the future tendency in this branch of power industry should be the CCPP with HRSG of supercritical pr...

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Abstract

The present invention discloses improved heated surfaces (HS) with vertical multiple passage panels or vertical serpentine coils from straight tubes with connections between them by top and bottom bends. In HS with tube bends there is not any mixing headers—each circuit has a single tube from inlet header to outlet header. This increases mass velocity of flow and improves stability and temperature regulation of tubes. The bottom bends have holes. The bottom bend holes of the adjacent passes are connected with drain header by drain stubs. Each header serves to drain the adjacent tube passes and as equalizing header of pressure / flow. It will help to decrease multivaluedness and maldistribution of flow between parallel tubes of the module. Such design of HS noticeably decreases the corrosion of tubes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority to U.S. provisional application No. 62 / 062,055 filed on Oct. 9, 2014.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention is the heated surfaces (HS) for application in the different technical fields—power industry, metallurgy, chemical industry, etc. Below the invention is considered in the context of power industry.[0004]2. Background Art[0005]For units of power industry which are based on Brayton and Rankine cycles the general tendency is increasing, the initial parameters—pressure and temperature to improve, the thermal efficiency (TE) and decrease carbon dioxide emissions. In the modern conventional units the pressure is well above the critical pressure. The boilers of such units are once through type.[0006]The same tendency with pressure increasing can be seen in the case of Combine Cycle Power Plants (CCPP) as well. At present time the pressure in steam genera...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F9/22
CPCF28F9/22F22B1/1815F22B37/10F28D21/0003F22B29/067F22D1/32F28D2021/0064Y02P20/10F01K7/16F01K7/30F01K7/32F22B1/18F28D7/085
Inventor POLONSKY, VLADIMIR S.POLONSKY, STANISLAV V.
Owner POLONSKY VLADIMIR S
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