A pulverized solid fuel nozzle tip assembly for use with a pulverized solid fuel pipe nozzle to issue a stream of pulverized solid fuel and air to a pulverized solid fuel-fired boiler is described. The pulverized solid fuel nozzle tip assembly has an outer nozzle tip portion adapted to mount in supported relation with the pulverized solid fuel pipe nozzle, and a monolithic, ceramic, inner nozzle tip portion adapted for mounting within the outer nozzle tip portion to have secure tiltable movement. The outer nozzle has supporting surfaces that support surfaces of the inner nozzle tip portion to minimize the tilting forces transmitted to the inner nozzle tip portion during normal furnace operation, enhancing the wear resistance of the pulverized solid fuel nozzle tip assembly. The outer nozzle has an air shroud with multiple air passages to direct secondary air over an outer surface of the inner nozzle tip portion.

A nozzle tip for a pulverized solid fuel pipe nozzle of a pulverized solid fuel-fired furnace is provided. The nozzle tip includes an inner nozzle portion and an outer nozzle portion that receives therein the inner nozzle portion. The outer nozzle portion has a lower supporting surface that is configured to support a lower surface of the inner nozzle portion. The outer nozzle portion also includes a plurality of ribs that define therebetween a plurality of flow passages for the passage of air. The ribs, in addition to define the airflow passages, provide bolstering support for the lower supporting surface. The outer nozzle portion is formed from stainless steel.

A nozzle tip for a pulverized solid fuel pipe nozzle of a pulverized solid fuel-fired furnace is provided. The nozzle tip includes an inner nozzle portion and an outer nozzle portion that receives therein the inner nozzle portion. The outer nozzle portion has a lower supporting surface that is configured to support a lower surface of the inner nozzle portion. The outer nozzle portion also includes a plurality of ribs that define therebetween a plurality of flow passages for the passage of air. The ribs, in addition to define the airflow passages, provide bolstering support for the lower supporting surface. The outer nozzle portion is formed from stainless steel.

A distribution ring for fuel in a burner (7) includes a hollow body (21) which is configured to be annular with respect to a longitudinal axis (22), a feed spigot (23) which is connected to the hollow body (21) and is intended for feeding the fuel into the hollow body (21), and a plurality of discharge spigots (25) for discharging the fuel from the hollow body (21) to the burner (7). The discharge spigots (25) are each arranged externally at the hollow body (21) in the radial direction of the longitudinal axis (22).

A solid fuel burner to be inserted into a burner throat bored in a wall portion of a furnace, comprising: a solid fuel nozzle for ejecting mixed fluid of solid fuel and primary air; a secondary air nozzle for ejecting secondary air; a tertiary air nozzle for ejecting tertiary air; a secondary air guide member for guiding a flow of the secondary air outwardly in a radial direction; and one or more tertiary air guide members for guiding a flow of the tertiary air outwardly in the radial direction at a first angle with respect to a central axis (C) of the solid fuel burner, wherein a distal end position (X2) of each of the tertiary air guide members in an axial direction of the solid fuel burner is at a closer side of the furnace than a distal end position (X1) of the secondary air guide member.

A solid fuel burner to be inserted into a burner throat bored in a wall portion of a furnace, comprising: a solid fuel nozzle for ejecting mixed fluid of solid fuel and primary air; a secondary air nozzle for ejecting secondary air; a tertiary air nozzle for ejecting tertiary air; a secondary air guide member for guiding a flow of the secondary air outwardly in a radial direction; and one or more tertiary air guide members for guiding a flow of the tertiary air outwardly in the radial direction at a first angle with respect to a central axis (C) of the solid fuel burner, wherein a distal end position (X2) of each of the tertiary air guide members in an axial direction of the solid fuel burner is at a closer side of the furnace than a distal end position (X1) of the secondary air guide member.

A solid fuel burner is provided with a guide member arranged on an outer circumferential section of a distal end of a first gas nozzle so as to guide a fluid flowing through a second flow passage outward in a radial direction; and a contraction forming member that is arranged on an upstream side of the guide member with respect to the flow direction of the second flow passage so as to reduce the cross sectional area of the second flow passage. An outer diameter of the guide member is formed to be smaller than an inner diameter of an outer peripheral wall of a second gas nozzle. The first gas nozzle, the guide member, and the contraction forming member are configured so as to be integrally attachable/detachable along an axial direction of the first gas nozzle toward the outside of a furnace.

Provided is a correlation deriving method including the steps of: generating coal ash by incinerating coal; generating sintered ash by heating the coal ash at a predetermined heating temperature within a range of a combustion temperature of a coal burning boiler; measuring hardness of the sintered ash; measuring an exhaust gas temperature exhibited when coal which is to have the hardness is burnt in the coal burning boiler; and deriving a correlation between the hardness and the exhaust gas temperature.

The present disclosure provides a carbon-based oxygen-enriched combustion method for recirculation of flue gas from a cement kiln. The combustion method includes recirculating the flue gas generated by the cement kiln to a certain degree to concentrate and enrich carbon dioxide in the flue gas of the cement kiln, mixing the carbon dioxide-rich recirculating flue gas of the cement kiln with the pressurized oxygen to obtain the carbon-based oxygen-enriched products, and mixing the carbon-based oxygen-enriched products with the atmospheric-pressure oxygen to obtain carbon-based air which serves as combustion-supporting gas of the cement kiln.

A swirl pintle coal slurry injector including a main body including at least one gas inlet; a pintle coupled to the main body, wherein the pintle comprises at least one coal slurry inlet and at least one slurry outlet, wherein the pintle defines a pintle axis; and a swirler coupled to the main body, wherein the swirler imparts to a gas from the at least one gas inlet of the main body a circular motion around the pintle axis, wherein the swirler surrounds the pintle axis and comprises a swirler number of approximately 1.2. The pintle can include a plurality of orifices of approximately 5 mm diameter.