US4702180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverized coal burner device
Assignee: IHI Corp
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Filing: 1987-03-24
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Granted: 1987-10-27
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Expires: 2007-03-24
Abstract
Abstract A pulverized coal burner device capable of ensuring stabilized combustion of pulverized coal even when mill load is low.
Inventors
- 👤 Takashi Kiga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:33
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/02; F23D; F23D1/00; F23D1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A pulverized coal burner device comprising a pulverized coal burner extending through a wall of a furnace and having a low-load pulverized coal nozzle, a tertiary air passage which surrounds said low-load pulverized coal nozzle and a high-load pulverized coal nozzle which surrounds said tertiary air passage, a line for supplying the pulverized coal to said high-load pulverized coal nozzle when a density of pulverized coal entrained in a primary air from a mill is high, separation means connected to said line for separating the pulverized coal and the primary air supplied through said line when the density of the pulverized coal in the primary air is low, thereby increasing the density of the pulverized coal, a line for supplying the air thus having the pulverized coal with the increased density to said low-load pulverized coal nozzle, a line for supplying tertiary air to said tertiary air passage, and a line for supplying to said high load pulverized coal nozzle the separated air containing a slight quantity of pulverized coal from said separation means.
Claim 2
Dependent Claim
174 words
A pulverized coal burner device comprising a pulverized coal burner extending through a wall of a furnace and having a low-load pulverized coal nozzle, a tertiary air passage which surrounds said low-load pulverized coal nozzle and a high-load pulverized coal nozzle which surrounds said tertiary air passage, a line for supplying the pulverized coal to said high-load pulverized coal nozzle when a density of pulverized coal entrained in a primary air from a mill is high, separation means connected to said line for separating the pulverized coal and the primary air supplied through said line when the density of the pulverized coal in the primary air is low, thereby increasing the density of the pulverized coal, a line for supplying the air thus having the pulverized coal with the increased density to said low-load pulverized coal nozzle, a line for supplying tertiary air to said tertiary air passage, and a line for supplying to said high load pulverized coal nozzle the separated air containing a slight quantity of pulverized coal from said separation means.
Claim 3
Dependent Claim
14 words
The device according to claim 1 wherein said separation means comprises a horizontal cyclone.
Claim 4
Dependent Claim
40 words
The device according to claim 1 wherein switching adjustment of supply of the pulverized coal to a line leading to said separation means and to the line leading to said high-load pulverized coal nozzle is accomplished by a dividing damper.
Claim 5
Dependent Claim
54 words
The device according to claim 1 wherein density of the pulverized coal in the air supplied from said separation means to said low-load pulverized coal nozzle is adjusted by controlling a quantity of air which is supplied from said separation means to said high-load pulverized coal nozzle and contains slight quantity of pulverized coal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |