Abstract

The present invention relates to a system and a method to reduce variations of the flow of soot blowing steam in a boiler (8) with a soot blowing system which comprises a plurality of soot blowers (1, 1) working with steam, which are operated in a sequence after each other, as well as control means for controlling the soot blowers and the ejection of steam through them (1, 1'), wherein a central, computerized control system (71) is arranged to control the start (3, 3') based on individual programmed values (11,13, 11 ', 13') for the individual soot blowers, or groups thereof, in such a way that the steam consumption (100) as far as possible is kept at a predetermined level at the exchange from a soot blower (1), or group, to the next soot blower (1'), or group,

IPC Classes  ?

• F23J 3/02 - Cleaning furnace tubesCleaning flues or chimneys
• F28G 15/04 - Feeding or driving arrangements, e.g. power operation
• F28G 1/16 - Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris

Abstract

In order to control the chemical process and combustion process inside the furnace and to keep the soot blowing to a minimum, continuous and reliable measurements of the process are needed. Achieving the desired results is difficult due to the extreme temperatures and chemical conditions in the furnace. Any sensors provided inside the furnace would themselves have to be cleaned from the soot or sintered dust from the process. The present invention relates to a method for more accurately measuring the conditions inside a power boiler by using a soot blower as a measuring probe. The invention also relates to a system for measuring the conditions in a power boiler, comprising a control unit, at least one sensor and a measuring probe placed inside said furnace, wherein said probe is arranged on a soot blower.

IPC Classes  ?

• F22B 37/38 - Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
• F27D 21/00 - Arrangement of monitoring devicesArrangement of safety devices
• F28G 1/16 - Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
• F28G 3/16 - Rotary appliances using jets of fluid for removing debris

Abstract

The present invention relates to a method for measuring the conditions inside a power boiler wherein a sootblower is used as a measuring probe. The invention also relates to a system for measuring the conditions in a power boiler, comprising a control unit, at least one sensor and a measuring probe placed inside said furnace, wherein said probe is arranged on a soot blower.

IPC Classes  ?

• F27D 21/00 - Arrangement of monitoring devicesArrangement of safety devices
• F22B 37/38 - Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
• F28G 1/16 - Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
• F28G 3/16 - Rotary appliances using jets of fluid for removing debris

Abstract

This invention relates to a method of rebuilding a sootblowing system of a recovery furnace, said sootblowing system including a plurality of sootblowers (1), and each sootblower (1) including a frame (10), a moveable carriage (14) supported by the frame (10), a motor (2) for moving the carriage (14), a lance tube (11) mounted on the carriage (14) to be insertable into and retractable from the recovery furnace (8), said lance tube (11) having at least one nozzle (12), and a steam feed tube (45, 35, 15) connected to the lance tube (11) for feeding sootblowing steam to be ejected through said at least one nozzle (12) into the recovery furnace, said steam feed tube (45, 35, 15) having a first valve (3) arranged to admit steam through said at least one nozzle (12) only when the carriage with the lance tube (11) is in an activated position, i.e. during retraction and introduction of the lance tube (11), wherein further providing means (4, 30) to arrange for controlled steam supply merely during a limited time period, e.g. merely during introduction.

IPC Classes  ?

• F28G 1/16 - Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
• F23J 3/02 - Cleaning furnace tubesCleaning flues or chimneys
• F28G 15/04 - Feeding or driving arrangements, e.g. power operation

Abstract

This invention relates to a method of rebuilding a sootblowing system of a recovery furnace, said sootblowing system including a plurality of sootblowers (1), and each sootblower (1) including a frame (10), a moveable carriage (14) supported by the frame (10), a motor (2) for moving the carriage (14), a lance tube (11) mounted on the carriage (14) to be insertable into and retractable from the recovery furnace (8), said lance tube (11) having at least one nozzle (12), and a steam feed tube (45, 35, 15) connected to the lance tube (11) for feeding sootblowing steam to be ejected through said at least one nozzle (12) into the recovery furnace, said steam feed tube (45, 35, 15) having a first valve (3) arranged to admit steam through said at least one nozzle (12) only when the carriage with the lance tube (11) is in an activated position, i.e. during retraction and introduction of the lance tube (11), wherein further providing means (4, 30) to arrange for controlled steam supply merely during a limited time period, e.g. merely during introduction.

IPC Classes  ?

• F23J 3/02 - Cleaning furnace tubesCleaning flues or chimneys
• F28G 1/16 - Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
• F28G 15/04 - Feeding or driving arrangements, e.g. power operation