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Process for superheated steam

a technology of superheated steam and process, which is applied in the direction of combustible gas catalytic treatment, sustainable manufacturing/processing, lighting and heating apparatus, etc., can solve the problems of deficiency of superheated steam and excessive high pressure steam

Inactive Publication Date: 2007-10-25
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] (c) transferring heat from at least a fraction of the remaining portion of the higher pressure st

Problems solved by technology

Such processes, either alone or in combination with other chemical processes, frequently produce abundant or excessive amounts of high pressure steam but are deficient in superheated steam.

Method used

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  • Process for superheated steam
  • Process for superheated steam
  • Process for superheated steam

Examples

Experimental program
Comparison scheme
Effect test

examples 1-5

[0078] Examples 1-5 illustrate the effect on turbine outlet steam quality by changing the pressure to which the high pressure inlet steam is reduced as per FIG. 1 of the instant invention. 100,000 kg / hr of saturated high pressure steam at 131 bara and 331.45° C. is divided and a portion is reduced in pressure. The resulting lower pressure steam is subjected to heat exchange with the remaining portion of high pressure steam. The approach temperature in the heat exchanger is 5° C., i.e., the superheated lower pressure steam temperature is 326.45° C. in all cases. The superheated lower pressure steam is fed to a steam turbine with an outlet pressure of 0.12 bara and a mechanical efficiency of 86.5% to produce electricity. Table 1 shows results per the instant invention for various lower pressure values.

TABLE 1Effect of PressureLowerAmount ofTurbinePressureLower P SteamDegreesOutletSteam,(thousandsSuperheat,Electricity,SteambaraKg / hr)° C.MWQualityExample 165.579.245.118.879.5%Example ...

example 6

[0080] Example 6, following the nomenclature of FIG. 3, illustrates the overall efficiency of a steam cycle. Heat input into steam generating zone 17 via conduit 19 is 245.3 GJ / hr as in Comparative Example 2. 112,350 kg / hr of liquid water at 49.5° C., is boiled in heat transfer zone 17 to produce 112,350 kg / hr of saturated high pressure steam at 131 bara and 331.45° C. in conduit 1. 17,550 Kg / hr is diverted via conduit 3, the remainder of 94,800 kg / hr passes via conduit 2 and is flashed across a valve to produce saturated steam at 42.4 bara, 253.8° C., 91.8% quality. The resulting lower pressure steam is divided into 7800 kg / hr of saturated liquid in conduit 6 and 87,000 kg / hr of saturated vapor in conduit 5. Conduit 5 subjected to heat exchange with conduit 3 in exchanger 8. The approach temperature in the heat exchanger is 5° C., producing superheated lower pressure steam temperature at 326.45° C., 42.4 bara in conduit 10 and condensed high pressure steam at 331.45° C. in conduit ...

example 7

[0081] Example 7, following the nomenclature of FIG. 4, illustrates the overall efficiency of a steam cycle. Heat input into steam generating zone 17 via conduit 19 is 245.3 GJ / hr as in Comparative Example 2. 115,290 kg / hr of liquid water via conduit 16 is boiled in heat transfer zone 17 to produce 115,290 kg / hr of saturated high pressure steam at 131 bara and 331.45° C., exiting via conduit 1. 16,410 Kg / hr is diverted via conduit 3, the remainder of 98,880 kg / hr passes via conduit 2 and is expanded in steam turbine 20 with a mechanical efficiency of 86.5% to produce 4.4 MW of electricity, and saturated steam at 42.4 bara, 253.8° C., 82.3% quality. The resulting lower pressure steam is divided into 17510 kg / hr of saturated liquid in conduit 6 and 81,370 kg / hr of saturated vapor in conduit 5. Conduit 5 subjected to heat exchange with conduit 3 in exchanger 8. The approach temperature in the heat exchanger is 5° C., producing superheated lower pressure steam temperature at 326.45° C.,...

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Abstract

Disclosed is a process for the preparation of superheated of steam by transferring heat from at least a fraction of a high pressure steam to a lower pressure steam to produce a superheated, lower pressure steam. The high pressure steam can be generated by recovering heat from a heat producing chemical process such as, for example, the partial oxidation of carbonaceous materials. The lower pressure steam can be generated by reducing the pressure of a portion of the high pressure steam or by recovering heat from one or more chemical processes. The superheated, lower pressure steam may used to generate electricity in a steam turbine, operate a steam turbine drive, or as a heat source. Also disclosed is a process for driving a steam turbine using superheated steam produced by the process of the invention.

Description

FIELD OF THE INVENTION [0001] This invention relates in general to a process for the preparation of superheated steam. More particularly, this invention relates to a process for the preparation of superheated steam by transferring heat from at least a fraction of a high pressure steam to a lower pressure steam to produce a superheated, lower pressure steam. The lower pressure steam can be generated by reducing the pressure of a portion of a high pressure steam or by recovering heat from one or more chemical processes. The superheated, lower pressure steam may used to generate electricity in a steam turbine, operate a steam turbine drive, or as a heat source. BACKGROUND OF THE INVENTION [0002] Many industrially significant chemical reactions are highly exothermic and the heat of reaction is used to generate steam. Examples of steam generating chemical processes include ethylene oxide production by partial oxidation of ethylene, methanol production from synthesis gas, gasification or ...

Claims

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Application Information

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IPC IPC(8): F01K23/06
CPCC10J2300/1675C10J2300/1846F01K3/26F22G1/005F22G1/14Y02E20/18Y02E20/16C10J2300/093C10J2300/0943C10J2300/0959C10J2300/1687C10J2300/1884C10J2300/1892C10K3/04Y02P20/10
Inventor BARNICKI, SCOTT DONALD
Owner EASTMAN CHEM CO
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