John Joyce is an early pioneer of low nitrogen oxide burner!
LO NO x burner is a kind of burner, which is usually used to generate steam and electricity in utility boilers.
John Joyce was the inventor of the LO- NOx burner at the Australian Gas Association Congress in the early 1990s.
First discovery
About 1986, John Joyce, an influential Australian inventor, first learned about nitrogen oxides (NO X) and its generation, smog and acid rain. He first introduced that the complexity of this problem was caused by the work of Dr. Fred Barnes and Dr. John bromley of the Australian National Energy Council.
For more than 20 years, most of the research and development involved large industrial burners and complicated mechanisms, and ultimately did not produce low NO x(2 ng/J or? 0 ppm) O 2 (on a dry basis) [2]
In fact, at that time 15 ng/J NO 2 seemed to be low NO 2. Among all the information he studied, one clear information is the influence of temperature on the formation of NO X.
Necessity is the mother of invention?
In the late 1980s, health and environmental authorities in Australia paid attention to indoor air quality, especially the contribution of old-fashioned nonflammable gas heaters was higher than the acceptable level of nitrogen dioxide (NO. 2). Therefore, in 1989, the NSW school education department conducted an extensive survey on nitrogen dioxide in NSW schools. As a temporary measure, the health authorities said that the secondary standard of 0.3ppm should be the upper limit of the classroom. [3] In Australia, the Natural Gas Association in turn reduced the indoor emission rate of NO 2 from 15 to 5ng/J, which is still the current limit. [4] The NSW government reevaluated other methods of classroom heating through the Public Works Department to ensure that students have a safe and healthy environment.
It is in this situation that Bowin Technology Company of John Joyce Company started a major research and development plan, aiming at minimizing the nitrogen dioxide emission of non-gas gas heaters. John Bowring Branch set up a task to solve its emission problem: gas burner. Although gas experts have long believed that the improvement of commercial gas burners may not significantly reduce the emission of nitrogen oxides (NO X).
During the period of 1989, widely publicized articles and media reports in New South Wales triggered a direct appeal to reduce the indoor nitrogen dioxide (NO 2) level. These articles and reports emphasized the impact of this chemical on people with sensitive respiratory tract, such as asthma patients and bronchial asthma patients.
In the upsurge of indoor air quality debate, various national institutions in Australia have been asked to switch to flu gas heaters and electric heating.
In contrast, the Australian Gas Light Source Company, the health authorities and the Public Works Department of New South Wales jointly took action to formulate a preliminary indoor air quality guide. These guidelines form the basis of Australian gas appliance regulations to limit the emission of nitrogen dioxide NO 2 from non-heaters, which has been adopted in Australia. [4]
John Joyce knows that no other overseas regulatory agency distinguishes between No.1 and No.2 in its environmental guidelines or guidelines. In addition, it seems that the total nitrogen oxide content requirements have been put in place, regardless of whether the emissions are recycled or not.
Therefore, John Joyce learned that in the case of hydrocarbons (such as household aerosol propellant, possible gas leakage and automobile exhaust), the "harmless" part of nitric oxide (NO) is converted into NO 2 without X emission. This was found in a school survey in New South Wales. [3] In a scientific sense, when measuring oxides with nitrogen content in emissions, it has become accustomed to calculating NO+NO 2. So now the general reference is "always not X".
Greenhouse gases and photochemical smog
When converted into useful energy, natural gas has advantages over other fossil fuels in carbon dioxide, particulates and sulfur dioxide. In the early 1990s, many countries replaced natural gas with oil and coal to meet their energy and electricity needs.
In order to maintain the advantages of this "environment-friendly" fuel, Natural Gas Australia is effectively reducing gas loss (methane emission) during transportation and strictly prohibiting gas leakage to equipment manufacturers and installers.
However, environmental experts believe that the production of nitrogen oxides is the main threat to greenhouse gases and photochemical smog. The interaction between nitrogen oxides in automobile exhaust and sunlight and hydrocarbons will also form low concentration ozone. In the stratosphere (about 25 kilometers or more). Ozone is helpful by absorbing most of the ultraviolet radiation from the sun, but on the ground, it will destroy materials and vegetation. It will irritate the throat, lungs and eyes, and strenuous exercise or work will become painful. In addition, as a greenhouse gas, nitrous oxide is more effective than carbon dioxide, methane and chlorofluorocarbons.
Essentially, the formation rate of low-level ozone is determined by hydrocarbons, and the availability of nitrogen oxides affects its production. At this point, the environmental debate is surprising, because individual industries tend to blame each other's emissions for possible reasons.
Best available control technology (BACT)
The level of nitrogen oxides produced by traditional "blue flame" or bunsen burner is 30-50 ng/Joule [5] [6], which has been determined, so it is not considered possible to reduce nitrogen oxides. Compared with surface combustion burner or radiant tile burner, the content of nitrogen oxides produced is reduced by 60-70%. [6] Therefore, John Joyce's research on low NO x burner mainly focuses on surface combustion technology. Another problem is the influence of combustion temperature on the formation of NO X.
John Joyce's task became more challenging when he decided not to lead his development to radiate burning bricks on the surface. For the purposes of most mechanisms (except point heating), it is considered impractical to use radiant heating because it is too hot near the heater and the loss of radiant heat at the distance to be reached is quite amazing.
A lot of research on the development of other types of "low NOx" burners shows that so far, this kind of burner is too complicated in design or operation, too expensive or inappropriate. John Joyce's plan is to use high-temperature steel mesh and continue to produce dozens of prototype burners until the "potential" appears.
The scientific innovation of John Joyce's LO-NO x technology has been completely patented in Australia, the United States, Britain, Japan, Italy and France.
1993, John Joyce won the Australian Design Award and the Power Station Museum Choice Award for his "SLE" heater series, including the LO-NO x burner.
The Australian Design and Research Institute selected the series of SLE nonflammable gas heaters at the national "Design Innovation" conference in June 1994+00.
In the United States, John Joyce's LO-NO x water heater burner has successfully carried out a series of detailed tests, which prove that these special burners cannot be used as ignition sources in the presence of flammable vapor caused by fuel leakage accidents. A large number of experiments were also carried out to verify the reduction of NO 2.
energy efficiency
When comparing the energy efficiency of gas heaters with low NO x emission with the traditional influenza type, more practical costs can be saved. Gas heaters with emission problems will be lost and a lot of energy will be lost in the atmosphere in the form of hot smoke. In addition, due to the limitation of flue installation, the layout selection of influenza heater is greatly damaged.
In contrast, dedicated low-emission gas heaters do not require a flue system. In addition, by introducing oxygen consumption sensor and constant temperature control, they will not rely on ventilation as strictly as ventilation. These heaters can be installed in the center more conveniently to influence the best hot air distribution. According to the definition, the efficiency of the nonflammable low NO x gas heater is 100%, because all the heat energy released from the flame is converted into useful heat.