[email protected]
High-tech Zone,Zhengzhou, Henan, China
The present invention overcomes the above-discussed dificiencies and disadvantages of the prior art by providing for the "direct" ignition of a stream of pulverized coal and air in a "cold" environment through the use of only a high energy electrical arc as an ignition energy source.
An electrical discharge is controlled in such a manner as to permit its use to reliably ignite a fuel stream consisting of pulverized coal entrained in air. The ignition technique of the present invention creates expanding and contracting plasma pockets at a rate which is high compared to the velocity of the fuel stream and permits the ignition of the fuel stream in a cold furnace
The direct ignition of pulverized coal in accordance with the present invention contemplates the delivery of a dense phase coal/air stream to an ignition zone where it receives ignition energy and the thus ignited mixture is thereafter contained in a recirculation region until the flame becomes self-sustaining. 110/264, 110/265, 431/2, 431/264.
2018-10-2 · Heated air enters the dryer from the left end and exits from the other end and brings the vapor extracted from the coal particles. A primary and a secondary bag filters are used to remove coal particles in air. In the cooling condenser, vapor is removed from air. Then cold air is heated by an electrical heater and enters the dryer again.
2002-1-1 · In this study, high-temperature air is applied to a pulverized coal burner to investigate the effect of air temperature on ignition, coal burnout, and NOx emission. Pulverized coal is introduced into a cylindrical furnace of 1 m diameter and 3 m height using a waterooled stainless nozzle of 15 mm diameter.
2009-5-1 · Thermo-gravimetric technique was used to study the combustion characteristics of pulverized coal in different O 2 /CO 2 environments. The effects of combustion environment, oxygen concentration, particle size and heating rate were considered and the differences of pulverized coal pyrolysis, combustion and gaseous compounds release under two
2017-1-16 · fresh coal on the bed surface is heated rapidly by the hot combustion gas and the radiation from the high-temperature flames and furnace walls. It is advantageous to the ignition of the coal. The burning coal then descends in turn through the reducing region and the oxidization region, becoming ash on the grate, and is finally removed. Figure 1.
2021-1-15 · 邹春 教授. 华中科技大学煤燃烧国家重点实验室教授，博士生导师。. 长期从事燃烧基础研究、湍流燃烧数值模拟以及小型燃烧装置研发等方面的研究。. 目前的主要研究方向是oxy-fuel燃烧、oxy-steam燃烧、MILD燃烧、对冲燃烧、燃烧模型以及小型燃烧装置。. 已经 ...
2021-8-30 · without Heated,Energy & Fuels, SCI 2015 [8] Numerical and experimental studies on the ignition of pulverized coal in O2/H2O atmospheres, Fuel, SCI 2014 [9] Characteristics and mechanistic analysis of CO formation in MILD regime with Fuel ...
PFS is a pulverized coal burner equipped with arc plasmatron producing high temperature air stream of 4000–6000 °C. Basis of technology PFS is
The process of aerosuspension ignition of a suspension in air in a pulverized-coal burner with a preswitched muffle by a central axisymmetric air stream heated in an electric-arc plasmatron to a temperature of about ≈5000K is numerically simulated. This process is the basis of a new fuel-oil-free method of ignition of the boilers of thermal power stations. The method is rather promising
2011-4-23 · pulverized coal burner equipped with arc plasmatron. The base of the PFS technology is plasma thermochemical preparation of coal for burning. It consists in heating of coal/air mixture by plasma up to temperature of coal volatiles release and char carbon partial gasification. In PFS the coal/air mixture is
2020-12-4 · One of the modern technologies is the use of a direct current plasmatron for ignition and stabilization of the pulverized coal flame [9]. This technology is based on heating the flow of a pulverized-coal mixture by a high temperature plasma arc at oxygen deficiency to the tem-perature exceeding the self-ignition temperature of this coal [10].
2014-8-22 · To implement this technology at coal-fired thermal power plants, plasma-fuel systems (PFSs) were developed. The PFS is a pulverized coal burner equipped with an arc plasma generator producing a high temperature air stream of 4000 °C-6000 °C. The PFS technology is plasma thermo-chemical preparation of coal for burning.
A vortex stabilized electric arc heater was attached to a full-scale commercial pulverized coal burner. A continuous arc heated air jet was used as an ignition source. The equipment was ...
2 shows the TG and DTG curves of coal samples. Ignition temperature (T i) and burnout temperature (T b) are essential characteristic temperatures of a burning profile. T i refers to the lowest temperature at which coal can be continuously burned when heated in air or an oxygen atmosphere. T i also represents the difficulty of coal ignition. T
2021-12-8 · pulverised-coal burners with arc plasmatrons. The main idea of the technology using PFS is to replace the traditionally used fuel oil for flame stabilisation and starting coal-fired boilers with the products of plasma chemically treated pulverised-coal. The coal−air mixture is fed into the PFS where the plasmatron induces heating,
the coal warehousefor along timecan also beoxidized,andthe self-ignition hazard increases if these oxidized PCs are directly utilized. Hence, it is necessary to understand the self-ignition characteristics for preoxidized pulverized coal. There are various flammable and explosive gases (CO 2,CH 4, C 2 H 4,CH 6, etc.) generated during PC ...
2021-10-27 · Ignition characteristics of coal/air jets from rectangular nozzles[C]. 9th International Symposium on Coal Combustion, Qingdao, China, July 21-24, 2019. 100.Lele Feng, Yuxin Wu, Kailong Xu, Hai Zhang, Yang Zhang.
2021-12-14 · Ignition characteristics of coal/air jets from rectangular nozzles[C]. 9th International Symposium on Coal Combustion, Qingdao, China, July 21-24, 2019. 100 Lele Feng, Yuxin Wu, Kailong Xu, Hai Zhang, Yang Zhang.
