Combustion and Heat transfer system Experts

Multipurpose Biomass gasifying burner

Today's industries heavily depend upon combustion of coal and other fossil fuel to generate power and  heat. Apparently their demand and price is also increasing. This has led to increase in cost of production. Further the laws to reduce and maintain emission from combustion is also becoming stringent, which further increases the cost of production and requirement for very complex combustion system.
Biomass is a suitable substitute for coal and other fossil fuel, as they are readily available and cheap. We have been depending upon a technique of mass incineration to recover the thermal energy from biomass for very long time. But this technique has a drawback, 

1) they are less efficient in conversion, 
2) they provide very little control and 
3) have higher emission. 

Biomass as a fuel has one major advantage, they are carbon neutral. The CO2 released during the combustion process is the CO2 absorbed from atmosphere during its growth phase. Thus burning biomass does not contribute to release of excess of global warming gases.

By nature the multi-phase combustion that occurs during biomass incineration is inefficient. It has been observed that less than 50% of the heat generated (natural convection driven incinerator) is utilized effectively and the remaining escapes through chimney. Even when forced draft is used, the effective utilization does not exceed 60%. Major of the heat is lost through incomplete combustion and formation of soot and tar.
We at EESAN Technologies, provide solution to overcome the above problems and allow our customers to use biomass as a fuel and increase effective utilization.

The Solution.

Gasification is a technology where solid fuel is converted in to combustible gases. Gasification allows us to reduce particulate, NOX and CO emission to a drastic level. Since the solid fuel is converted in to a gaseous fuel, it leads to a homogeneous combustion where emission reducing strategies are already available. Further it allow us to have a high degree of control over its operation and thermal power output.

Our Technology

Numerous strategies are  available to gasify a solid fuel, we use a very simple strategy of Direct Gasification. In this strategy the biomass is gasified and they are instantaneously burned in a secondary burner. The salient feature of the developed burner technology are as follows:
  • Unlike other gasification strategy, they don't require gas cleaning and cooling facility. this makes the burner easier to operate, less maintenance required and the cost of the equipment is also very less.
  • It is easier to implement NOX and CO reduction strategies like Lean Burn or RQL.
  • The burner system can respond to load variation very quickly.
  • The burner system can vary up to 10% of the maximum power output and still keeping the emission in acceptable limit.
  • The burner configuration allow us to reach flue gas temperatures greater than 1300oC (Depending upon the moisture content of the biomass used). When compared to the conventional mass incineration where the maximum temperature reached does not exceed 850oC - 950oC, the higher temperatures results in efficient heat transfer and maximum utilization (reducing the fuel consumption).
  • The burner system allow us to setup clean working environment with no smoke, soot and tar. This greatly adds to increased productivity.

Multipurpose Biomass Gasifying burner: How it Works?

NK-1 burner was specifically designed around direct gasification technology. The system has a fully automated fuel feeding system. The sensors in the burner detects the level of the fuel in the buffer chamber of the burner, as per the requirement the system fills the burner with biomass. The biomass enters a reactor chamber to undergo gasification reaction. The primary air enters the reactor chamber and it reacts with the biomass and it undergoes gasification. The unique shape of the reactor reduces the formation of tar and higher conversion rate. The generated gases are collected and passed on to an inbuilt secondary crossflow flow burner, where a measured amount of secondary air is  mixed with the combustible gases in the secondary burner and ignited. The secondary combustion from the burner results in an very high temperature flue gases with very low emission.
The secondary burner have been specifically developed to burn lean mixtures, which results in very low emission of CO and NOX.

Features of the Burner

  • Fully automated and interactive control panel.
  • Higher fuel flexibility. Can use biomass which has moisture content upto 65% (Fuel chip size max 50mm). The burner is designed to gasify almost any biomass residue and at the same time it can also gasify coke, coal and municipal waste.
  • Auto feed mechanism with pressurised feed tube to reduce gas escape.
  • Automated continuous ash collection system.
  • Very low NOX and CO emission.
  • Heavily insulated walls to prevent heat loss from the burner.
  • Adaptable mouth piece to fit in to existing system.

Specification of the burner.
  • Thermal power output : 100KW - 4 MW
  • Fuel quality : any solid fuel with 30% moisture content
  • NOX emission levels: 125ppm
  • CO emission levels: 35ppm

Application of burner
  • Steam generation
  • Drying and process heat generation
  • Kilns
  • smelting

The burner can be utilized where ever process heat is required. This burner allows us to use a very low grade fuel and in the same time it also allows us to control it similar to a gas burner.

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