Please select the most similar patent number from A, B, C and D. Which number is?
A low pollution combustor and combustion control method therefor. The low pollution combustor comprises a combustor dome (12), the combustor dome (12) comprises a main combustion stage (14) and a pre-combustion stage (15), and the main combustion stage (14) and the pre-combustion stage (15) are arranged together in a concentric manner; the pre-combustion stage (15) is in the center, and the main combustion stage (14) is arranged on the periphery of the pre-combustion stage (15); the main combustion stage (14) comprises a main combustion stage channel, a main combustion stage swirler (30) provided in the main combustion stage channel, and a pre-film plate (31); the pre-film plate (31) is divided into an outer-layer pre-film plate (31b) and an inner-layer pre-film plate (31a) in a radial direction. A position and a spraying direction of a fuel spaying point (25) of the main combustion stage (14) are configured to control main combustion stage fuel to be sprayed into the main combustion stage channel by means of main combustion stage fuel nozzle holes (25a, 25b), a part of the main combustion stage fuel forms main combustion stage direct spray oil mist, the other part is hit on the inner-layer pre-film plate (31a) close to the inner side of the main combustion stage channel, or is separately hit on the two layers of pre-film plates (31a, 31b). According to the low pollution combustor and control method therefor, the double layers of pre-film plates (31a, 31b) are coordinated with the position and the spraying direction of the fuel spaying point (25) in different working conditions, so that combustible mixed gases are distributed more evenly in a flame tube.
A: A low-nitrogen oxide straight-through pulverized coal combustion apparatus applicable to a lean coal-fired boiler comprises main combustor groups that are disposed in corner-tangential combustion manner at the four corners of a furnace of the lean coal-fired boiler, cooperate with a water-cooling wall anti-high temperature anti-corrosion system of the furnace, and are of the same structure with the system, each main combustor group comprising pulverized coal combustors and secondary air nozzles (AA, AB, BC, CC, DD, DE, EF, FF1, and FF2) that are disposed at a spacing. The upper portion of each main combustor group is provided with a corresponding over fire air separation group. A layer of a prechamber reverse-flow combustor is disposed every n layers of pulverized coal combustors, a jet flow rotation direction of the main combustor group is the anticlockwise direction, a jet flow rotation direction at the secondary air nozzle closely neighboring to the upper portion of the prechamber reverse-flow combustor is the clockwise direction, and the diameter of the imaginary tangential circle is greater than that of the main combustor. The over fire air separation group is formed by an upper group and a lower group, the jet flow of the lower group is a large imaginary tangential circle, and the upper group is in an opposed firing manner. The combustion apparatus can implement stable combustion and minimize the discharge of oxynitride.
B: A supercritical CO2 boiler and a boiler system. The boiler comprises a main combustion chamber (2), an upper hearth (3), a furnace arch (4), and a flue; the cross section of the main combustion chamber (2) is circular, oval, or N-sided, and N&gt;4; the main combustion chamber (2) is provided with at least four combustor groups; each group of combustor nozzles corresponding to each combustor group comprise a recirculating air nozzle (15), a primary air nozzle (13), and a secondary air nozzle (14); side recirculating air nozzles (16) which are symmetrically distributed are provided on the two sides of each primary air nozzle (13); the recirculating air nozzles (15) and the side recirculating air nozzles (16) are used for feeding recirculating flue gas or mixed gas of the recirculating flue gas and secondary air into the main combustion chamber (2); the primary air nozzles (13) are used for feeding primary air or mixed gas of the primary air and the recirculating flue gas into the main combustion chamber (2); and the secondary air nozzles (14) are used for feeding secondary air or mixed gas of the secondary air and the recirculating flue gas into the main combustion chamber (2), such that the load of the supercritical CO2 boiler and the load of the boiler system are uniform, and high-temperature corrosion, coking and slagging on the wall surface of the boiler are avoided.
C: A gas premix burner and a gas water heater. The gas premix burner (10) is provided with a burning direction (F), the gas premix burner (10) is matched with a premix cavity arranged at the upstream of the burning direction (F) of the gas premix burner (10), and gas and air are burned via the gas premix burner (10) after being mixed in the premix cavity. The gas premix burner (10) comprises: a burner substrate (11), main burning holes (13) being arranged on the burner substrate (11). Auxiliary burning holes (15) arranged along the burning direction (F) at the downstream of the main burning holes (13) are also provided on the burner substrate (11). Auxiliary flames of the auxiliary burning holes (15) and main flames of the main burning holes (13) intersect. The main burning holes (13) are arranged along the burning direction (F) at the upstream of the auxiliary burning holes (15) so that the main flames are arranged at the upstream of the auxiliary flames, it is easier for the auxiliary flames and the main flames to intersect, and opposed firing of the flames is formed between the auxiliary flames and the main flames to implement a stable flame effect.
D: A combustion chamber of a gas turbine engine. The combustion chamber comprises: an annular flame pipe (10), wherein the annular flame pipe (10) forms an annular combustion cavity (14), and the annular combustion cavity (14) defines an axial direction and a circumferential direction surrounding the axial direction; and several nozzles (12) disposed within the annular combustion cavity (14), uniformly arranged in the circumferential direction, and configured to jet a mixed gas of a fuel gas and the air into the combustion cavity (14). Each of the nozzles (12) is provided with at least one mixed gas outlet (30) used to jet the mixed gas toward an adjacent nozzle (12). One flame barrier structure is disposed between two adjacent nozzles (12) to prevent a flame generated from the mixed gas from being directly jetted to the adjacent nozzle (12). The combustion chamber of a gas turbine engine of the present invention has a simple structure, reduces damage risks of components to the lowest level, and improves combustion efficiency thereof.
Answer: D