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Boiler Burners2022-12-16T19:23:07+00:00

ClearSign Core™
Boiler Burner Technology

Complete systems and retrofits available

REQUEST A QUOTE
Firetube Data Sheet

ClearSign Core™
Boiler Burner Technology

Complete systems and retrofits available

REQUEST A QUOTE

Ultra Low NOx <2.5ppm

Premixed combustion, entrainment of spent flue gases, and a distal flameholder enable NOx levels never before seen in the industry – all without the use of reagents, catalysis and/or high excess air conditions.

Ultra Low CO <50ppm

Thorough premixing of the incoming fuel and air mixture ensures a highly efficient combustion at temperatures that ensure complete CO burnout.

Turndown >5:1

Increased combustion intensity and robust flame holding generate wide stability envelopes and ensure a high degree of turndown.

High Efficiency

Stable operation at low excess air levels ensures highly efficient combustion unlike competing high excess air solutions.

Capacity

ClearSign Core™ Boiler solutions have ranges from as low as 4MMBTU/hr and up to 100MMBTU/hr, a true testament to the breadth and scalability of the technology.

Retrofit Solution

Due to the burner arrangement, a conventional burner tile is not required, allowing the burner to increase fired capacity without the need to change existing cutouts in the furnace floor. This allows for quicker and less expensive retrofit / burner changeouts.

Boiler Burner Industries

Agriculture

Refining

Chemical

Industrial

Commercial

CLEARSIGN DELIVERS 3 SUCCESSFUL

OTSG Installations To Central California Customer

A Case Study.

A California based customer approached ClearSign interested in applying the technology to meet the area’s strict emissions regulations. The initial field application scaled the bench scale burner with a firing rate of 250,000 Btu/hr to a 62.5 MMBtu/hr production unit with an emissions target of sub 6 ppm NOx (corrected to 3% O2, volume, dry). 

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Our Boiler Burner Technology Partner

Our partnership with California Boiler combines the unique capabilities of our combustion technology with the extensive boiler installation and service experience of California Boiler.  Together, we are able to meet the specific demands of industrial boiler clients. 

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Firetube Boiler

A firetube boiler is a type of boiler in which hot gases pass from a combustion zone through one or many tubes running through a sealed container of water. The heat from the gases is transferred through the walls of the tubes by thermal conduction, heating the water and creating steam. Such boilers can be further classified as single pass, two, three or even four pass to denote the number of loops or passes the flue gases make prior to exiting via the stack.

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SOURCE TESTS

Watertube Boiler

A watertube boiler is a type of boiler in which water circulates in tubes heated externally by the combustion process. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes. The heated water then rises into the steam drum where saturated steam is drawn off the top of the drum. In some services, the steam will reenter the furnace through a superheater to gain additional enthalpy/energy.

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FAQ

Q – How does the ClearSign Core™ technology compare with respect to legacy equipment?2021-11-15T16:22:46+00:00

The technology provides unprecedented emissions levels (~2.5ppm NOx at 3% O2) compared to traditional equipment without the use of reagents, high excess air conditions or degradations in thermal efficiency

Q – Do I need to operate the boiler any differently with ClearSign Core™ installed?2019-11-18T20:36:02+00:00

No, the Clearsign technology can be operated in exactly the same manner as a legacy burner with regard to start up, ramp rate and shut down protocols.

Q – What fuels do boilers use?2019-11-18T20:23:37+00:00

Natural gas, coals, liquid distillates and biofuels

Q – What modifications do I need to make on my equipment?2019-11-24T02:30:34+00:00

Basically none. The Clearsign Core™ technology is a retrofittable technology that is easily inserted through the same boiler burner openings as the OEM burner.

Q – How can I buy the ClearSign Core™ Technology?2019-11-18T20:26:26+00:00

Clearsign sells its technology through its channel partners or equivalently through Clearsign itself for retrofit applications.

Q – How does ClearSign Core™ Technology Work?2021-11-10T15:25:39+00:00

A distal metallic flameholder and continuous pilot are located downstream of the conventional burner location. Fuel pokers inject fuel downstream and entrain FGR. The cold charge thoroughly mixes as it approaches the flame holder. Thorough mixing of all gas streams, a continuous pilot, and robust flame anchoring ensure excellent combustion stability and superior emissions performance over the operating envelope.

There are two basic designs for firetube boilers. The typical design is the “wetback”, where the rear face of the combustion chamber is water-jacketed for additional heat extraction. The simpler, but less efficient “dryback” variation has the rear of the combustion chamber as an open, insulated box, backed or surrounded only by a sheetmetal.

Firetube boilers were used on virtually all steam locomotives in the horizontal form. Due to their higher heat density, horizontal fire-tube boiler is also typical in marine applications. Therefore, these boilers are commonly referred to as “scotch-marine” or more simply, “marine” type boilers. They also see usage in Residential Heating and in many industrial process for providing process heat and/or steam.

Clearsigns’s disruptive technology has taken such legacy boilers into the 21st century by enabling sub 2.5ppm NOx performance in a simple to use, automated package delivering > 5:1 turndown.

Cool water at the bottom of the steam drum returns to the feedwater drum via large-bore ‘downcomer tubes’, where it pre-heats the feedwater supply. To increase efficiency, exhaust gases are also used to pre-heat the air blown into the furnace and warm the feedwater supply.

Water tube boilers are prevalent in several industries including chemical, pulp and paper, oil refining and residential and commercial heating.

As with the firetube boilers, Clearsign’s disruptive technology has advanced the industry standard by enabling sub 5ppm NOx performance in a simple to use, automated package that provides seamless integration into legacy control architectures and operational protocols.

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