A gas turbine soft combustor and its control method
A combustor, soft technology, applied in the direction of combustion method, combustion chamber, continuous combustion chamber, etc., can solve the immature lean premixing technology of coal-to-synthesis gas, limited potential of nitrogen oxide emission, difficulty in reducing nitrogen oxides, etc. problems, achieve ultra-low nitrogen oxide emissions, increase flue gas residence time, and compact structure
Active Publication Date: 2018-10-09
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
Diffusion combustion technology has limited potential to reduce nitrogen oxide emissions; lean premixed combustion of natural gas has more and more complex nozzles and control systems as the gas turbine level increases, and nitrogen oxide emissions exceed the standard under low-load conditions. Increasingly difficult, lean premix technology for burning coal to syngas is immature
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[0042] In the present invention, jet nozzles and on-duty swirl nozzles are arranged in the combustion chamber, and the joint action of the jet nozzles and on-duty swirl nozzles is used to form a high-efficiency low-pressure drop backflow inside the combustion chamber, and the mixed gas jet entrains high-temperature flue gas to quickly form high-temperature and low-oxygen The mixture reduces the mixing time and improves the mixing efficiency, which can directly realize soft combustion and effectively reduce the peak flame temperature during the combustion process, thereby achieving ultra-low nitrogen oxide emissions. On the premise of ensuring the combustion efficiency and performance of the combustion chamber, the invention can realize ultra-low nitrogen oxide emission in a wide load range, the combustion chamber has a compact structure, and is suitable for natural gas, coal-based synthesis gas and other medium and low calorific value Combustion of syngas.
[0043] In order to...
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The invention provides a mild combustor. The mild combustor comprises a combustor flame tube, a combustor casing and a combustor head baffle; the combustor head baffle and the front wall of the combustor casing form the head of the combustor, and an on-duty nozzle assembly is arranged in the center of the head of the combustor; a jet flow nozzle assembly is arranged on the circumference of the head of the combustor, and the center of the head of the combustor serves as the circle center of the circumference; a first return flow zone formed by the on-duty nozzle assembly is located in the downstream position of the outlet end of the on-duty nozzle assembly, a second return flow zone formed by the jet flow nozzle assembly is located in the downstream position of the first return flow zone, mild combustion in the combustor flame tube is achieved, and ultra-low nitrogen oxide emission in a wide load range can be achieved; and moreover, high-temperature flue gas is mixed with air / fuel mixed gas, and accordingly the combustion efficiency is improved. The mild combustor is compact in structure, is a cylindrical combustor and can directly replace a gas turbine engine combustor of the similar structure.
Description
technical field [0001] The invention relates to the technical field of gas turbines, in particular to a soft combustion chamber of a gas turbine and a control method thereof. Background technique [0002] Nitrogen oxides include nitric oxide, nitrogen dioxide, nitrous oxide, etc., which are extremely harmful to the environment and are one of the main sources of acid rain and photochemical smog. With the continuous improvement of environmental protection requirements, the emission standards of nitrogen oxides are becoming more and more stringent. As the core power equipment, the gas turbine needs to continuously increase the temperature Further reduce nitrogen oxide emissions. With the improvement of gas turbine parameters, traditional diffusion combustion technology and premixed combustion technology are facing great challenges. Diffusion combustion technology has limited potential to reduce nitrogen oxide emissions; lean premixed combustion of natural gas has more and mor...
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IPC IPC(8): F23R3/28F23R3/38
CPCF23R3/28F23R3/38
Inventor 熊燕周子琛邵卫卫张哲巅肖云汉
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI