Patent US4194468A successfully refreshed from Google Patents.
US4194468A
Expired / Lapsed
US
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Forced-flow boiler installation and method of operating the same
Assignee: Sulzer AG
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Filing: 1978-08-25
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Granted: 1980-03-25
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Expires: 1998-08-25
Abstract
Abstract A forced-flow boiler installation and method of operating the same comprising a series circuit of a feed pump, an economizer, an evaporator and a water separator as well as a recirculation line or system containing therein a circulating pump and leading from the water outlet of the separator to the evaporator inlet. Between the feed pump and a subsequently connected closure valve there branches-off a filling line or conduit having a valve and bypassing the economizer and leading to the evaporator inlet. The economizer, at the region of its maximum geodetic height, contains venting means.
Inventors
- 👤 Walter Augsburger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
F; F22; F22B; F22B35/00; F22B35/06; F22B35/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A forced-flow type boiler installation comprising: a feed pump; an economizer; an evaporator; a water separator; said feed pump, economizer, evaporator and water separator being connected in series; said separator having a water outlet and said evaporator having an inlet; a circulation line means having a circulation pump leading from the water outlet of the separator to the inlet of the evaporator; filling line means having a valve; a closure valve connected following the feed pump; said filling line means branching-off between the feed pump and the closure valve connected following the feed pump; said filling line means bypassing the economizer and leading to the inlet of the evaporator; and means for venting the economizer at the region of its maximum geodetic height.
Claim 2
Dependent Claim
123 words
A forced-flow type boiler installation comprising: a feed pump; an economizer; an evaporator; a water separator; said feed pump, economizer, evaporator and water separator being connected in series; said separator having a water outlet and said evaporator having an inlet; a circulation line means having a circulation pump leading from the water outlet of the separator to the inlet of the evaporator; filling line means having a valve; a closure valve connected following the feed pump; said filling line means branching-off between the feed pump and the closure valve connected following the feed pump; said filling line means bypassing the economizer and leading to the inlet of the evaporator; and means for venting the economizer at the region of its maximum geodetic height.
Claim 3
Dependent Claim
43 words
The forced-flow boiler installation as defined in claim 1, further including: saturation vapor line means branching-off of the water separator; and said venting means comprising a line having valve means and opening into said saturation vapor line means branching-off of the water separator.
Claim 4
Dependent Claim
18 words
The forced-flow boiler installation as defined in claim 2, wherein: said closure valve simultaneously constitutes a feed-regulation valve.
Claim 5
Dependent Claim
33 words
The forced-flow boiler installation as defined in claim 1, wherein: said water separator has a lower region; and A withdrawal line having valve means provided for the lower region of the water separator.
Claim 6
Independent Claim
177 words
A method of placing into operation a forced-flow boiler installation, particularly for hot start-up of such boiler installation following shutdown thereof, comprising the steps of: providing a series circuit of a feed pump, an economiser, an evaporator and a water separator; providing a circulation line with a circulation pump and leading from a water outlet of the separator to an inlet of the evaporator; during normal forced-flow of the boiler installation infeeding feedwater by means of said feed pump to the economiser, evaporator and water separator; following shutdown of the boiler installation and hot start-up thereof carrying out the steps of: infeeding feedwater to the evaporator and separator by means of a filling line; then when the economiser is filled with steam recirculating water out of the evaporator via the separator and the circulation line into the evaporator by means of the circulation pump; firing the boiler; and then filling the economiser rearwardly out of the evaporator with water approximately at saturated temperature before there is again initiated the normal forced-flow through the economiser and the evaporator.
Claim 7
Independent Claim
177 words
A method of placing into operation a forced-flow boiler installation, particularly for hot start-up of such boiler installation following shutdown thereof, comprising the steps of: providing a series circuit of a feed pump, an economiser, an evaporator and a water separator; providing a circulation line with a circulation pump and leading from a water outlet of the separator to an inlet of the evaporator; during normal forced-flow of the boiler installation infeeding feedwater by means of said feed pump to the economiser, evaporator and water separator; following shutdown of the boiler installation and hot start-up thereof carrying out the steps of: infeeding feedwater to the evaporator and separator by means of a filling line; then when the economiser is filled with steam recirculating water out of the evaporator via the separator and the circulation line into the evaporator by means of the circulation pump; firing the boiler; and then filling the economiser rearwardly out of the evaporator with water approximately at saturated temperature before there is again initiated the normal forced-flow through the economiser and the evaporator.
Claim 8
Dependent Claim
30 words
The method as defined in claim 5, wherein: said rearward filling of the economizer with water is accomplished while infeeding feedwater to the evaporator by means of the filling line.
Claim 9
Dependent Claim
56 words
The method as defined in claim 5, further including the steps of: providing means for venting the economizer; and directly prior to actuating the means for venting the economizer briefly bringing the water level in the separator to a height which is essentially at a minimum in consideration of the operating characteristics of said circulation pump.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |