Water-coal-slurry low-nitrogen combustion steam-injection boiler and low-nitrogen combustion mode thereof

Abstract

The invention discloses a water-coal-slurry low-nitrogen combustion steam-injection boiler. The water-coal-slurry low-nitrogen combustion steam-injection boiler is characterized in that a furnace body is arranged on the upper portion of a boiler body, no water cooled furnace wall is installed around the furnace body, and instead a heat insulating area with a heat insulating layer is installed; a furnace body is arranged on the lower portion of the boiler body, and a heated area with a water cooled furnace wall is installed around the furnace body; a burner is installed at the top of a hearth of the boiler, and a water-coal-slurry gun with a water-coal-slurry nozzle is arranged at the center of the burner; an igniter and an ignition natural gas gun are installed beside the water-coal-slurry gun, a primary air nozzle is installed on the periphery of the water-coal-slurry gun, and a secondary air nozzle is installed outside the primary air nozzle; the hearth is divided into an ignition pre-burning area, a steady burning area and a burn-out area from top to bottom; the steady burning area is provided with a steady burning area secondary air nozzle, and the burn-out area is provided with an SOFA air nozzle; and the lower side of the burn-out area is connected with a cinder box, and the side portion of the burn-out area is connected with an exhaust gas outlet. The invention further provides a low-nitrogen combustion mode of the water-coal-slurry low-nitrogen combustion steam-injection boiler. By means of the water-coal-slurry low-nitrogen combustion steam-injection boiler and the low-nitrogen combustion mode thereof, NOx emission in the water-coal-slurry burning process can be reduced.

Description

technical field [0001] The invention relates to a coal-water slurry low-nitrogen combustion steam injection boiler and a low-nitrogen combustion method thereof. Background technique [0002] Heavy oil production in Xinjiang Oilfield in my country uses conventional gas-fired steam-injection boilers. With the influence of two unfavorable factors, the limited use of natural gas and the increase in prices, it is necessary to remanufacture and upgrade the existing conventional gas-fired steam-injection boilers to coal-water slurry superheated oilfield steam-injection boilers. Substituting coal for gas is one of the options for fuel transformation. my country has abundant coal reserves and a complete range of coal types. The development and application of coal-water slurry technology is in line with the national energy policy of replacing oil with coal, and is an important part of promoting clean coal technology. As a substitute for petroleum fuel, coal water slurry has the advant...

AI Technical Summary

Problems solved by technology

The NOx produced during the combustion of coal-water slurry is mainly fuel-type NOx. Maintaining a low-oxygen combustion environment can effectively inhibit the formation of fuel-type NOx. However, if the oxygen supply is insufficient, it will affect the combustion efficiency and cause energy waste.

Images