Abstract: An ammonia preheating flow-controllable low-nitrogen ammonia-coal co-firing burner is provided according to the present application, including a primary air duct, an inner secondary air duct, and an outer secondary air duct. The gas injector in the primary air duct is used to mix gas uniformly into primary air-coal powder flow. The gas injectors in the inner secondary air duct and the outer secondary air duct are arranged in a staggered configuration, with nozzles in both the gas injectors in the inner secondary air duct and the outer secondary air duct curving toward a center of a burner outlet, directing gas into flame core. By arranging different types of the gas injectors in the primary air duct, the inner secondary air duct, and the outer secondary air duct, and optimizing their positions, promoting a more uniform combustion process and improving overall combustion efficiency and stability.

Abstract: A micro-flow throttling device, comprising: a casing used for assembling; a throttling structure mounted inside the casing to form resistance to control a fluid flow, wherein the throttling structure comprises a first axial hole formed inside a fine threaded rod, a first radial hole is formed on one side of the first axial hole, a fine thread flow channel is mounted on one side of the first radial hole, and a second cavity is formed between the fine thread flow channel and a coarse thread flow channel; a regulating structure mounted on the casing and used for regulating the flow rate of the fluid; and a butt-joint structure mounted on the inner wall of the casing and used for performing disassembly and assembly limiting on the throttling structure.

Abstract: A micro-flow throttling device, comprising: a casing used for assembling; a throttling structure mounted inside the casing to form resistance to control a fluid flow, wherein the throttling structure comprises a first axial hole formed inside a fine threaded rod, a first radial hole is formed on one side of the first axial hole, a fine thread flow channel is mounted on one side of the first radial hole, and a second cavity is formed between the fine thread flow channel and a coarse thread flow channel; a regulating structure mounted on the casing and used for regulating the flow rate of the fluid; and a butt-joint structure mounted on the inner wall of the casing and used for performing disassembly and assembly limiting on the throttling structure.