Arrow Energy Co., Ltd. — air-pollution-control and boiler engineering from Thailand

Arrow Energy Co., Ltd. is a Thai limited company with its head office in Bangkok and its own factory and R&D centre in Samut Sakhon. To be explicit about the name: we are not affiliated with Arrow Energy Pty Ltd, the coal-seam-gas producer in Australia. This company designs, manufactures, installs and services industrial air-pollution-control technology — electrostatic precipitators, the proprietary Electrocyclone pre-collector, bag filters, multicyclones, wet scrubbers and flue-gas treatment — together with boiler pressure parts and heat recovery: economizers, air preheaters, superheaters, water walls and the spares that keep them running.

The customers are plants that burn difficult solid fuels: biomass power stations, sugar and ethanol mills firing bagasse, cement lines, and pulp and paper mills. Bagasse duty defines the character of the work — roughly 50 % moisture as fired, LHV around 7.2–7.5 MJ/kg, heavy char carryover and abrasive, high-silica fly ash — and a raw dust load at the collection-train inlet on the order of 6,000 mg/Nm³ at 6 % O₂ dry. Getting from that number to a permit limit, and doing it with sensible fan power and footprint, is the company's core competence. The same flue-gas path carries recoverable heat, which is why the emission and boiler sides sit in one engineering team: an economizer retrofit that drops stack temperature by 60–80 °C returns 3.1–4.0 percentage points of boiler efficiency and simultaneously moves the ESP toward its favourable 150–180 °C operating window.

Scope runs from a single spare electrode to a complete train delivered through our boiler and emission-control services — engineering assessment, fabrication, erection, commissioning and the performance test on a stated basis. Anonymised reference classes include a 170 t/h bagasse-fired sugar mill in Thailand, a 250 t/h biomass power plant in Thailand and a 230 t/h sugar mill in Colombia; details are on the project references page.

The split matters for one practical reason: the engineer who sizes a precipitator can walk to the shop floor where its plates are rolled, and the field engineer who finds a recurring failure feeds it back into the next design revision rather than into a service invoice. The quality-system detail — what ISO 9001:2015 covers and, just as importantly, what it does not — is documented on the certifications and quality system page.

Arrow Energy Co., Ltd. was founded by Pavan Rajput, Founder & CEO, who still reviews the engineering basis of major proposals personally, and is directed with Orawan Chuadmee, Executive Director.

What is the Electrocyclone?

The Electrocyclone is Arrow Energy's proprietary pre-collector: cyclonic separation augmented by an electrostatic field in one vessel. As a first stage it removes roughly 90 % of particulate load ahead of a final collector, at service temperatures up to 400 °C, in 60–65 % of the plot footprint of an equivalent-duty ESP, with near-zero moving-part maintenance.

Its practical effect is on the train, not just the stage: with 85–95 % of the dust removed upstream, the downstream electrostatic precipitator can be smaller for the same outlet, or an existing undersized ESP can meet a tightened limit without civil works. That is the configuration in the published design basis — Electrocyclone plus four-field ESP reaching 24 mg/Nm³ at 6 % O₂ dry on a 60 t/h bagasse boiler (illustrative calculation, not a guarantee).

The second piece of flagship work is a boiler discipline, not a collector: re-engineering decades-old units whose owners face full replacement because the original documentation has largely been lost. Arrow Energy's engineers re-measure the pressure parts in situ, reconstruct the thermal and mechanical design from the surviving fragments and their own calculations, and re-engineer the boiler — replacing what the numbers condemn and retaining what they clear, so the plant avoids a full replacement. The work is the philosophy in one story: where documentation ends, calculation continues; nothing is condemned, and nothing is trusted, without a number. CONFIRM: revamp case details (age, scope, outcome) approved for publication