A high-power thermal combustion fuel delivery injection head

Abstract

The invention provides a large-power thermal combustion fuel conveying spray head. The improvement of the large-power thermal combustion fuel conveying spray head is characterized in that the spray head comprises a pipe (1); the pipe (1) comprises an air duct (2) composed of pipe bodies coaxially arranged; the position, from an air inlet to an air outlet of the air duct, in the axial air duct is sequentially provided with an auxiliary channel (6), an intermediate auxiliary boss (14) with an auxiliary fuel pipe fastening connector (9), and an auxiliary boss (14) with a fuel pipe input connector (8), and the auxiliary channel (6), the intermediate auxiliary boss (14) and the auxiliary boss (14) are radially and equidistantly arranged; and the axis of the air duct (2) is provided with an axis seat (15). According to the technical scheme provided by the invention, the conditions of fuel conveying, air supply and flame stabilization are improved, and the flame propagation stability and the combustion sufficiency are effectively improved.

Description

technical field [0001] The invention relates to the technical field of thermal combustion, in particular to a high-power thermal combustion fuel delivery injection head. Background technique [0002] The main form of human energy utilization is thermal combustion. In the face of the severe situation of rapid development of productivity, depletion of disposable energy, and continuous deterioration of living environment, the traditional thermal combustion technology with a long history will move towards intelligent and refined control, high efficiency, energy saving and micro emission. , Development in the direction of "green combustion" of new energy utilization. [0003] Existing liquid (gas) fuel high-power combustion equipment, such as fuel oil, alcohol fuel, ether-based fuel, biodiesel, petroleum liquefied gas, natural gas and other combustion devices, all use mechanical direct injection technology to achieve extensive combustion , There are many problems in terms of com...

AI Technical Summary

Problems solved by technology

[0005] 1. The fuel nozzle is directly installed at one end of the delivery pipe, so that the installation position and angle of the nozzle are strictly restricted by the direction of the delivery pipe. The injection direction is limited and can only be coaxial with the direction of the pipe. If you want to change it, you need to bend it Pipeline, which is obviously very inconvenient or difficult, and it is not easy to precisely control the injection angle, and it is difficult to form a spiral jet stream that satisfies sufficient combustion

[0006] 2. The simple connection between the fuel nozzle and the delivery pipeline allows only one nozzle to be installed in one fuel delivery pipeline. The displacement of a single combustion equipment is actually limited by the number of fuel delivery pipelines. Displacement or to achieve fine combustion with more stages of fire control requires multiple nozzles, and it is necessary to lay or branch many pipelines, which is obviously very inconvenient or difficult, and sometimes even impossible; of course, increasing the single nozzle The caliber can also increase the displacement, but this needs to be equipped with a higher delivery pressure, which is uneconomical and will inevitably bring serious problems of increased combustion efficiency and emission pollution.

[0008] 1. The fuel delivery pipeline and the air duct are coaxial and inclusively connected. Without exception, the pipelines are directly inserted into the air duct from the side or rear end of the air duct. All the pipes are included in the air duct and arranged in parallel along the axial direction. Extending to the air outlet port, the space occupied along the axial direction of the air duct is unfavorable to the air supply;

[0009] 2. The air duct space is limited, it is inconvenient to lay more pipes, and it is impossible to install more nozzles, which limits the displacement of a single combustion equipment or restricts the fine combustion of more stages of fire;

[0010] 3. The coaxial logical relationship between pipes and air ducts is not convenient for centralized fuel and air supply, and it is not convenient to form a high-power and extra-high-power thermal combustion system with multiple machines connected in parallel.

[0011] 3. Defects of the flame stabilization device

[0014] (1) For the existing combustion equipment using mechanical direct injection technology, the mechanical connection between the fuel nozzle and the cyclone disk is without exception that the cyclone disk is in front and the nozzle is behind, so that it is necessary to open holes in the cyclone disk to Nozzle injection is not blocked, usually a hole must be opened at the center of the combustion cyclone disk to provide injection openings for multiple nozzles. If additional nozzles are to be added, additional openings must be added at other positions. This obviously has the effect of the number of nozzles installed, the direction of injection and the stability of the flame. For example, in order to increase the displacement, it is necessary to set more nozzles, or to set a variety of spray angles, it is necessary to open holes or open large holes in the cyclone disk, which will change the blocking ratio of the cyclone disk, thereby affecting the return flow The size and shape of the zone will destroy the stability and reliability of combustion to a certain extent; on the contrary, if there are fewer holes on the cyclone disk, although the flame stability required by the design can be achieved, the number of nozzles is small or the injection direction is single, resulting in small displacement. and other issues;

[0015] (2) Existing combustion equipment that adopts mechanical direct injection technology does not consider the optimal matching of the caliber of each nozzle (or nozzle group) and the fuel delivery variable when multi-nozzle work (or multi-stage fire control) is not considered in fuel delivery , the single delivery variable produced by the fuel pump corresponds to multiple nozzles of different calibers, which will inevitably cause the mismatch between the caliber of each nozzle (nozzle group) and the injection variable, and may cause over-atomization of small-caliber nozzle injection (which is extremely unfavorable to the combustion of alcohol fuels). Large-diameter nozzles spray under-atomization, which affects the adequacy, stability and reliability of combustion. If alcohol fuel is used, frequent misfires may occur, and even cause the risk of deflagration in severe cases;

[0017] (1) The whirlwind disc is thin, the air jets of the three channels are very short, and the duct effect is very small, and neither can form a "duct-type" air supply, so the wind force of the tertiary wind is not obtained under a certain original wind pressure. Directional strengthening, the effect of near, medium and long-distance air supply, as well as the effect of flame stabilization and shaping are only at the usable level, but far from the optimal state;

[0018] (2) The poor bluff body of a single cyclone disk structure only provides a fixed blocking ratio, and it is difficult to create a more ideal flame stability zone (or recirculation zone) with a volume and shape

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