Control of blowdown in steam boilers

a technology of steam boilers and control valves, which is applied in the field of steam boilers, can solve problems such as blowdown operation, and achieve the effect of reducing heat loss

Inactive Publication Date: 2014-04-17
AUTOFLAME ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for reducing fuel waste and water wastage in a boiler system by adjusting the amount of blowdown based on the production of steam. By controlling the amount of blowdown, excessive blowdown can be avoided, and fuel can be saved when the boiler is operating below its maximum continuous rating. Additionally, the patent suggests adjusting the time for which the control valve is open during each blowdown operation to reduce heat loss. This can be done by adjusting the time based on the reduction in steam production.

Problems solved by technology

Each opening and closing of the control valve results in a blowdown operation.

Method used

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  • Control of blowdown in steam boilers
  • Control of blowdown in steam boilers

Examples

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Embodiment Construction

[0025]Referring to FIG. 1, a pressurised steam boiler installation generally comprises a fuel burner 1, which in this case is a gas and oil burner, and a boiler housing 3. Gas is fed along a pipe 2 via a butterfly valve 4, and / or oil is fed along a pipe 5 via a butterfly valve 6. Air is driven along a duct 7 by a fan 8 via a damper valve 9. The burner also has a pilot fuel feed 10.

[0026]In the burner 1, the fuel and air are mixed and combustion takes place. The products of combustion pass from the burner 1 through a heat exchanger 11 in the boiler housing 3 containing water 14 into the bottom of a stack 15. The combustion products pass up the stack 15 and into the atmosphere.

[0027]An outlet pipe 16 extends from the bottom of the boiler housing 3 via a blowdown flow control valve 17 to a blowdown receiver (not shown), providing a bottom blowdown facility that is in most respects conventional, but employs an electrically controlled blowdown valve and servomotor assembly. The use of an...

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Abstract

Blowdown of a pressurised steam boiler heated by a burner 1 and including a blowdown flow control valve 17 is controlled by opening the control valve in response to receiving a control signal from a control unit 20 to allow water to leave the boiler. The control unit receives one or more signals indicative of the steam production rate of the boiler and adjusts the amount of blowdown in dependence upon the aggregate steam production.

Description

TECHNICAL FIELD [0001]This invention relates generally to blowdown of steam boilers heated by burners. More particularly, the invention relates to control systems for use in such installations and to methods of commissioning and operating such installations. The invention relates in particular, but not exclusively, to a steam boiler such as might be used in hospitals, hotels, offices or other industrial, commercial or domestic premises.BACKGROUND OF THE INVENTION[0002]Steam boilers are well known. Examples of US patents referring to aspects of the design of pressurised steam boilers are U.S. Pat. No. 6,520,122 and U.S. Pat. No. 7,249,573, the contents of which are incorporated herein by reference.[0003]Standard steam boilers are fitted with a bottom blowdown valve which, when opened for a short period of time allows an amount of hot water to leave the boiler, carrying with it solid deposits that have accumulated at the bottom of the boiler as it has been operating. The removal of su...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F22B37/56
CPCF22B37/565F22B13/02
Inventor KEMP, BRENDAN
Owner AUTOFLAME ENG
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