Combustion organization method and nozzle of a combustion chamber using medium and low calorific value fuel gas
A technology of fuel gas and low calorific value, applied in combustion methods, gas fuel burners, combustion chambers, etc., can solve the problems of head mixing, existence, and difficult burnout, so as to reduce pressure loss, solve air shortage, and enhance The effect of the blending effect
Active Publication Date: 2016-05-11
CHINA UNITED GAS TURBINE TECH CO LTD
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Problems solved by technology
However, since the fuel volume flow rate of medium and low calorific value fuel gas in the combustion chamber is about 5 to 10 times that of natural gas at the same outlet temperature, the mixing method at the head of the combustion chamber is quite different from that of natural gas, and the following problems arise: 1) Fuel volume The increase in the flow rate makes it difficult for the air channel in the outer layer of the nozzle to achieve a partial premixing effect. In fact, the fuel gas blocks the air from entering from the top of the nozzle; 2) The increase in the fuel volume flow rate causes the fuel gas and air in the head to not be fully mixed, resulting in stable combustion Low resistance, CO is difficult to burn out
The typical method of premixing the inner layer of fuel and the outer layer of air at the tip of the nozzle does not fully meet the requirements for the combustion of medium and low calorific value fuel gas inside the combustion chamber.
The head is prone to the phenomenon that there is not enough air and fuel gas to fully mix, so the flame mainly exists at the rear end of the flame tube
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[0025] The principle, structure and specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0026] figure 1 It is a schematic diagram of the overall structure of the combustion chamber in the present invention, including a nozzle 1, a cover cap and a flame tube 2 and the like. figure 2 with image 3 It is a structural schematic diagram of the combustion chamber nozzle described in the present invention. The nozzle includes a medium-low calorific value fuel gas inlet pipe 14, a central air inner pipe 17, a fuel gas outer pipe 16 and a nozzle jet outlet; a fuel ring is formed between the central air inner pipe 17 outer wall and the fuel gas outer pipe 16 inner wall Cavity 111, the jet outlet of the nozzle includes the outer air jet outlet 11, the fuel gas jet outlet 13 and the central air jet outlet 12 which are sequentially arranged on the top surface of the nozzle from outside to inside, and the three...
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The invention provides a nozzle structure and combustion organizing method of a combustion chamber for combusting fuel gas with a low-medium calorific value in a gas turbine, and relates to the technical field of gas turbines. According to the characteristics that the fuel gas with the low-medium calorific value is low in calorific value, high in flame propagation speed and large in volume flow rate in the combustion chamber, the problems that the head portion of the nozzle for combusting the fuel gas with the low-medium calorific value is lack of air and the combustion is insufficient are effectively solved in the process of organizing combustion in the combustion chamber by changing the structure of the nozzle and by distributing the flow and proportion of air entering the combustion chamber to different portions of the nozzle and different portions of a flame tube, and therefore efficient mixing between a large amount of fuel gas and air in the main combustion area of the combustion chamber is achieved, and stable, efficient and low-pollution combustion is ensured.
Description
technical field [0001] The invention relates to a low calorific value fuel gas combustion chamber nozzle and a combustion organization method thereof, belonging to the technical field of gas turbine combustion and equipment. Background technique [0002] Gas turbines are widely used. For industrial heavy-duty gas turbines, their main purpose is to generate electricity. Gas turbines have advantages in efficiency, economic competitiveness, pollutant emission control, especially CO 2 Emission reduction has great development potential and is an important part of power generation technology. [0003] The basic principle of a heavy-duty gas turbine for industrial power generation is to compress air through an air compressor, send it to the combustor and mix it with fuel to generate high-temperature and high-pressure gas, drive the output power of the turbine and drive the air compressor to rotate. Gas turbines can burn a variety of fuels and effectively control nitrogen oxides (N...
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IPC IPC(8): F23R3/38F23R3/02F23D14/24F23C7/00
Inventor 吕煊张珊珊方子文
Owner CHINA UNITED GAS TURBINE TECH CO LTD