A double swirl lean premix nozzle and its application
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A premixed nozzle, double swirl technology, applied in combustion methods, lighting and heating equipment, continuous combustion chambers, etc., can solve the problem of high pressure loss in the combustion chamber, reduce emissions, solve high pressure loss, and reduce local high temperature. Effect
Active Publication Date: 2019-02-01
TONGJI UNIV
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[0005] The purpose of the present invention is to provide a double-swirl lean premixing nozzle based on air and gas classification and multi-point multi-stage injection of gas to solve the problem of high pressure loss in the combustion chamber of a micro gas turbine. problems, and coordinate the contradiction between combustion efficiency and nitrogen oxide emissions
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[0034] like Figure 1-4 As shown, a double-swirl lean premixing nozzle includes a gas splitting chamber cap 6, a gas splitting chamber 1 set on the top of the gas splitting chamber cap 6, a central spindle 7 suspended below the gas splitting chamber 1, The lean premix chamber 10 located at the bottom of the central spindle body 7 and the annular guide unit connecting the gas split chamber 1 with the lean premix chamber 10 and the outside air, the nozzle also includes a coaxial inner axial swirler 9 and The outer axial swirler 8 and the inner axial swirler 9 are arranged in the lean premix chamber 10, and the inner diameter of the inner axial swirler 9 is connected with the central spindle body 7, and the outer diameter is connected with the annular gas chamber 5, The inner diameter of the outer axial swirler 8 is connected with the outer wall surface of the annular gas chamber 5 . In the working state, after the gas is divided by the gas distribution chamber 1, a part of it e...
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Abstract
The invention relates to a double swirl lean premixing spray nozzle and application thereof. The spray nozzle comprises a gas distribution cavity cap, a gas distribution cavity formed in the top of the gas distribution cavity cap, a central spindle arranged below the gas distribution cavity in an overhanging manner, a lean premixing cavity positioned at the bottom of the central spindle as well as an annular diversion unit for making the gas distribution cavity communicate with the lean premixing cavity and outside air. In a working state, gas is distributed by the gas distribution cavity, then one part of the gas enters the lean premixing cavity through the annular diversion unit, and the remaining part is sprayed into the outside air, so that passive classification of the gas is realized; and the spray nozzle is applied to a combustion chamber of a micro gas turbine using gas as fuel. Compared with the prior art, the double swirl lean premixing spray nozzle disclosed by the invention has the advantages that a two-stage axial swirler is adopted to be matched with passive gas classification and multipoint spraying measures to form lean premixing gas, flame area is enlarged, local high temperature is reduced, and further pressure loss and nitrogen oxide emission are reduced, so that the combustion efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of gas turbines, and relates to a double swirl lean premix nozzle and its application. Background technique [0002] In the distributed energy system, the micro gas turbine is widely used as the prime mover of the system because of its characteristics of fast start and stop, good fuel adaptability, and light weight. The micro gas turbine has a series of advanced technical features such as multiple integrated capacity expansion, multiple fuels, low fuel consumption rate, low noise, low emission, low vibration, low maintenance rate, remote control and diagnosis, etc. In addition to distributed power generation, it can also be used for backup Power stations, combined heat and power generation, grid-connected power generation, peak load power generation, etc., are the best way to provide clean, reliable, high-quality, multi-purpose, small-scale distributed power generation and combined heat and power supply, whe...
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