Method for reducing fireside tube deposition and boiler sootblowing requirements
Patent
·
OSTI ID:6768355
The method is described of operating a dry product feeding apparatus to periodically feed measured amounts of a dry product into a kraft recovery boiler in timed relation to a sootblowing cycle to coat the fireside surfaces of the sootblown heat exchanger tubes and establish a cleavage plane to inhibit deposit formation. The apparatus includes a vessel having an inlet into which a measured amount of the product is fed by a metering device and an outlet connected to an air supply line. The air supply line is connected to an air supply upstream from the vessel and the boiler downstream from the vessel. a control valve in the line upstream from the vessel to selectively turns the air supply on and off, and valves at the inlet and the outlet for control the passage of product into and out of the vessel. A programmable relay sequentially operates the air supply valve, the inlet and outlet valves and the metering device. The method comprises the steps of, opening the air supply valve to blow the air supply line clear, opening the outlet valve to allow the product to enter the air supply line and be blown into the boiler, closing the outlet valve and allowing the air supply to continue to blow the line clear, closing the air supply valve and opening the inlet valve, turning on the metering device and charging the vessel with a subsequent measured amount of product, and turning off the metering device and closing the inlet valve.
- Assignee:
- Nalco Chemical Co., Oak Brook, IL
- Patent Number(s):
- US 4639381
- OSTI ID:
- 6768355
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR FLOW
AIR POLLUTION CONTROL
BOILERS
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLOWMETERS
FLUID FLOW
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
GAS FLOW
HEAT EXCHANGERS
INTAKE STRUCTURES
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
METERING
METERS
POLLUTION CONTROL
PROGRAMMING
RELAYS
SCALE CONTROL
SOOT
TIME DEPENDENCE
VALVES
421000* -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR FLOW
AIR POLLUTION CONTROL
BOILERS
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLOWMETERS
FLUID FLOW
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
GAS FLOW
HEAT EXCHANGERS
INTAKE STRUCTURES
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
METERING
METERS
POLLUTION CONTROL
PROGRAMMING
RELAYS
SCALE CONTROL
SOOT
TIME DEPENDENCE
VALVES