US4569890A
Expired / Lapsed
US
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Process for increasing the heating value of fuel gas mixtures containing hydrogen
Assignee: EOn Ruhrgas AG
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Filing: 1982-05-05
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Granted: 1986-02-11
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Expires: 2002-05-05
Abstract
Abstract Fuel gas mixtures of different composition containing hydrogen may be the main products or by-products of chemical conversion processes such as, without limitation, processes for the conversion of solid or liquid fuels. Such gas mixtures are, however, normally not fit for public gas supplies, as their heating value and their density and other properties would normally not conform to the standards and the codes of practice for gas properties. Methanation is a known process for the conversion of hydrogen-rich fuel gas mixtures into gases conforming to standard specifications. During the exothermal reaction of methanation, more than 15% of the enthalphy of the reactants may be lost. The invention allows the increase of the heating value of hydrogen-rich fuel gas mixtures, said increase being achieved at a high efficiency and maximizing the recovery of useful energy in the form of gas conforming to standards and electric power. The invention employs a fuel cell unit to which the complete gas mixture is supplied and in which part or all of the hydrogen contained in said gas mixture is oxidized by an electrochemical reaction and from which the constituents not so oxidized are removed inclusive of any hydrogen which may not have been so oxidized.
Inventors
- 👤 Gunter Barthel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:12
CPC Classifications
C; C10; C10K; C10K3/00; H; H01; H01M; H01M8/00; H01M8/06; H01M8/0606; H01M8/0612; H01M8/0643; H01M8/0662; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
207 words
A process for increasing the heating value of fuel gas mixtures containing hydrogen gas to at least 17.58 MJ/m 3 and increasing the specific gravity of the gas to at least 0.4 comprising: (a) gasifying coal under pressure to produce a raw gas comprising hydrogen gas, carbon monoxide, steam, unsaturated hydro-carbons, hydrogen cyanide, and organic sulphur compounds; (b) scrubbing and cooling the raw gas; (c) conducting all the raw gas to a catalytic shift converter wherein the carbon monoxide and steam are converted to carbon dioxide and hydrogen gas, the hydrocarbons are hydrogenated and the hydrogen cyanide and organic sulfur compounds are at least one of decomposed and hydrogenated; (d) removing the sulphur compounds from the gas resulting from (c) to produce a fuel gas mixture containing hydrogen gas; (e) supplying all the fuel gas mixture to a fuel cell unit; (f) supplying oxygen to the fuel cell unit; (g) conducting an electrochemical reaction in the fuel cell unit to oxidize at least part of the hydrogen gas in the fuel gas mixture with the oxygen thereby producing electric energy and steam; (h) removing the resulting fuel gas mixture and steam from the fuel cell unit; and (i) separating the steam from the resulting fuel gas mixture.
Claim 2
Dependent Claim
207 words
A process for increasing the heating value of fuel gas mixtures containing hydrogen gas to at least 17.58 MJ/m 3 and increasing the specific gravity of the gas to at least 0.4 comprising: (a) gasifying coal under pressure to produce a raw gas comprising hydrogen gas, carbon monoxide, steam, unsaturated hydro-carbons, hydrogen cyanide, and organic sulphur compounds; (b) scrubbing and cooling the raw gas; (c) conducting all the raw gas to a catalytic shift converter wherein the carbon monoxide and steam are converted to carbon dioxide and hydrogen gas, the hydrocarbons are hydrogenated and the hydrogen cyanide and organic sulfur compounds are at least one of decomposed and hydrogenated; (d) removing the sulphur compounds from the gas resulting from (c) to produce a fuel gas mixture containing hydrogen gas; (e) supplying all the fuel gas mixture to a fuel cell unit; (f) supplying oxygen to the fuel cell unit; (g) conducting an electrochemical reaction in the fuel cell unit to oxidize at least part of the hydrogen gas in the fuel gas mixture with the oxygen thereby producing electric energy and steam; (h) removing the resulting fuel gas mixture and steam from the fuel cell unit; and (i) separating the steam from the resulting fuel gas mixture.
Claim 3
Dependent Claim
21 words
The process according to claim 1 wherein the fuel cell unit contains an acid electrolyte and is operated at high pressure.
Claim 4
Dependent Claim
26 words
The process according to claim 2 wherein the electrolyte is an aqueous orthophosphoric acid solution with an orthophosphoric acid concentration of 60 to 95% by weight.
Claim 5
Dependent Claim
17 words
The process according to claim 3 wherein the concentration of the orthophosphoric acid is 85% by weight.
Claim 6
Dependent Claim
13 words
The process according to claim 2 wherein the pressure is approximately 23 bar.
Claim 7
Dependent Claim
59 words
The process according to claim 1 wherein the gas mixture supplied to the fuel cell unit is preheated to at least a temperature closed to the operating temperature of the fuel cell unit before it reaches the fuel cell unit by countercurrent heat exchange with the fuel gas mixture having a higher heating value leaving said fuel cell unit.
Claim 8
Dependent Claim
17 words
The process according to claim 6 wherein the operating temperature of the fuel cell is 180° C.
Claim 9
Dependent Claim
22 words
The process according to claim 7 wherein the fuel gas mixture is preheated to a temperature in the range of 160°-170° C.
Claim 10
Dependent Claim
20 words
The process according to claim 1 wherein the fuel gas mixture containing hydrogen gas is a hydrogen-rich fuel gas mixture.
Claim 11
Dependent Claim
26 words
The process according to claim 1 wherein the fuel gas mixture containing hydrogen gas is a methane-containing gas produced by the gasification of coal under pressure.
Claim 12
Dependent Claim
43 words
The process according to claim 10 wherein the methane-containing gas is converted to gas having at least the heating value of town gas or coke-oven gas by the electrochemical oxidation of at least part of the hydrogen gas contained in the methane-containing gas.
Claim 13
Dependent Claim
23 words
The process according to claim 1, wherein each fuel cell unit comprises 700 modules, each module further comprising 290 cells connected in series.
Claim 14
Dependent Claim
33 words
The process according to claim 12 wherein each cell comprises an anode and a cathode, the fuel gas mixture entering the cell at the anode and oxygen entering the cell at the cathode.
Claim 15
Dependent Claim
22 words
The process according to claim 13 wherein the anode and the cathode have an active electrode coating comprising carbon activated by platinum.
Claim 16
Dependent Claim
19 words
The process according to claim 13 wherein each cell has an active electrode surface of 0.3 m 2 .
Claim 17
Dependent Claim
30 words
The process according to claim 1 wherein the pressure in the catalytic shift converter is approximately 25 bar and the pressure in the fuel cell unit is approximately 23 bar.
Claim 18
Dependent Claim
23 words
The process according to claim 1 wherein the pressure of the fuel cell mixture leaving the fuel cell unit is approximately 20 bar.
Claim 19
Dependent Claim
40 words
The process according to claim 1 wherein the temperature of the fuel gas unit mixture leaving the fuel cell unit is cooled to 40° C. by heat exchange with the fuel gas mixture before it reaches the fuel cell unit.
Claim 20
Dependent Claim
17 words
The process according to claim 1, wherein a plural member of the fuel cell unit is provided.
References Cited (Backward Citations)
US29312A
Cited
US1596729A
Cited
US1863636A
Cited
US3669751A
Cited
US3877989A
Cited
USRE29312E
Cited
US3976507A
Cited
US3976506A
Cited
US4127468A
Cited
US4309359A
Cited
US4128700A
Cited
US4298453A
Cited
US4250230A
Cited
US4333992A
Cited
US4365006A
Cited
US4365007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |