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SLIP STREAM SUPERHEATING FOR HEAT INTEGRATION IN POWER PLANT

IP.com Disclosure Number: IPCOM000224548D
Publication Date: 2012-Dec-31
Document File: 3 page(s) / 41K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to thermal power plants or chemical plants, which do not have gas turbines or heat recovery steam generators (HRSG) and all superheating is dependent on process side heat. According to invention, a split stream of highest-pressure superheated steam is used to superheat the feed going to downstream or lower pressure turbines. The idea is to take a “slip” out of the highest pressure superheated steam and use it in stages for downstream superheating. The method disclosed ensures superheated steam going to turbine without any external medium required, thereby addressing the problem of condensation between steam turbine stages without an external source of heat or major changes in the plant.

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SLIP STREAM SUPERHEATING FOR HEAT INTEGRATION IN POWER PLANT

BACKGROUND

The invention relates to thermal power plants or chemical plants, which do not have gas turbines or heat recovery steam generators (HRSG) and all superheating is dependent on process side heat. Coal to methane, coal to methanol plants are typical examples of such plants. In these plants, a lot of exothermic heat is released, which is recovered in the form of steam. However, the full potential of this energy cannot be realized, because there is no means of superheating the steam. This invention proposes new ways of superheating in existing plants which face the problem of condensate formation between stages of the turbine, because of absence of reheating system.

BRIEF DESCRIPTION OF DRAWINGS

Slip stream superheating for heat integration in power plant is disclosed in the following drawing in which:

Figure 1 shows a schematic superheat circuit with slip stream superheating.

DETAILED DESCRIPTION

According to invention, a split stream of highest-pressure superheated steam is used to superheat the feed going to downstream or lower pressure turbines. The idea is to take a “slip” out of the highest pressure superheated steam and use it in stages for downstream superheating, as shown in Fig. 1.

The working of the invention can be divided into following steps. First superheated steam of highest pressure possible is produced in the process side. A “slip” is taken out of the above stream, from the HP superheated stage. The rest of the steam is sent to turbine for expansion, i.e. power generation. The slip stream is now used to superheat the exhaust of the first turbine, which goes to subsequent turbine. The slip stream is thereby used to superheat the subsequent turbine exhaust...