A scale remover that efficiently removes scale deposited inside a boiler without corroding a boiler includes polyacrylic acid and polymethacrylic acid and/or salts thereof.

A method and means for washing a floor of a recovery boiler, including mixing by mixing devices wash water in which remaining salt on recovery boiler furnace floor dissolves, and where wash water is sucked from a wash water pool on the furnace floor into suction openings of the mixing devices for implementing said mixing.

A method and means for washing a floor of a recovery boiler, including mixing by mixing devices wash water in which remaining salt on recovery boiler furnace floor dissolves, and where wash water is sucked from a wash water pool on the furnace floor into suction openings of the mixing devices for implementing said mixing.

An apparatus is described for cleaning the exterior of a furnace heat exchanger that includes a bundle of finned convection or bare radiant tubes heated when in use by the flue gases of a heater furnace. The apparatus comprises a motorized carriage 10 guided for movement along the outer surface of the bundle in a direction parallel to the tubes and a holder 24 on the carriage for holding a lance 20 in a position relative to the carriage 10 that permits the lance 20 to penetrate between the tubes of the bundle and to be advanced along the core by the carriage while remaining in the latter position.

An apparatus is described for cleaning the exterior of a furnace heat exchanger that includes a bundle of finned convection or bare radiant tubes heated when in use by the flue gases of a heater furnace. The apparatus comprises a motorized carriage 10 guided for movement along the outer surface of the bundle in a direction parallel to the tubes and a holder 24 on the carriage for holding a lance 20 in a position relative to the carriage 10 that permits the lance 20 to penetrate between the tubes of the bundle and to be advanced along the core by the carriage while remaining in the latter position.

A method and apparatus for direct contact steam generation for a variety of industrial processes including heavy oil recovery, power generation and pulp and paper applications. The steam generation system consists of a combustor and steam generator and is constructed to be operable at elevated pressures. The fuel, at least one oxidant and a fluid supply including water are supplied at pressure to the combustor. Flue gas from the combustor is delivered to the direct contact steam generator at pressure, and upon direct contact with water produces a flue gas stream consisting primarily of steam. This product stream can then be cleansed and used for industrial application. The combustor can be operated with low grade fuel and low quality water with high solids and hydrocarbon contents. The apparatus and method reduce the environmental footprint by reducing air emission, concentrating CO.sub.2 to enable capture and reducing clean water requirements.

A cleaning system and method for cleaning heat transfer surfaces in a boiler using a temperature measuring system for measuring and monitoring wall temperature of an annular wall of the tube of a lance of one or more sootblowers. Controlling a flow of steam or other fluid through the tube during the cooling portions of the strokes based on wall temperature measurements from the temperature measuring system. Infrared or thermocouple temperature measuring systems may be used. The steam or other fluid may be flowed at a default flowrate that may be substantially zero until the temperature measuring system indicates the wall temperature of the annular wall begins to exceed a predetermined temperature limit which may be the softening point of the annular wall. Then the steam or other fluid is flowed at a rate greater than the default flowrate.

A cleaning system and method for cleaning heat transfer surfaces in a boiler using a temperature measuring system for measuring and monitoring wall temperature of an annular wall of the tube of a lance of one or more sootblowers. Controlling a flow of steam or other fluid through the tube during the cooling portions of the strokes based on wall temperature measurements from the temperature measuring system. Infrared or thermocouple temperature measuring systems may be used. The steam or other fluid may be flowed at a default flowrate that may be substantially zero until the temperature measuring system indicates the wall temperature of the annular wall begins to exceed a predetermined temperature limit which may be the softening point of the annular wall. Then the steam or other fluid is flowed at a rate greater than the default flowrate.

An injection device for injecting injection fluid (chemicals) into piping through which fluid flows, the injection device comprising: an injection line through which the injection fluid flows, the injection line being connected to the piping; an injection pump disposed on the injection line; an extrusion line connected downstream of the injection pump and upstream of a target portion for air removal on the injection line; and an extrusion pump for feeding extrusion fluid to the extrusion line, wherein a discharge capacity of the extrusion pump is greater than a discharge capacity of the injection pump.

When using soda ash reagent in an SBS injection system, various impurities from various possible sources can form suspended solid particles and also form scale that may foul the filtration screens, piping, reagent storage tanks, and instrumentation in the injection system. A system and method are disclosed in which a chelating agent cleaning process removes existing scale, or alternatively, prevents the particles and scale from forming. Various embodiments operate in batch or continuous modes or a combination of both.