mg/Nm³ @ stated O₂, dry
Baseline emission basis
Services · Assessment-first delivery
ESP service and retrofit: measure, engineer, execute
Every Arrow Energy service starts with measurement: emission tests in mg/Nm³ at stated O₂, gas flow, temperature profiles and field-by-field voltage-current curves. Engineering follows the data — an ESP upgrade sized in s/m of SCA, an economizer sized in recovered percentage points — and execution ends with a performance test on the same stated basis the project began with.
SCA, s/m (design basis 75.7 s/m)
ESP sizing stated in
6,000 → 24 mg/Nm³ @ 6 % O₂ dry
Design-basis upgrade outcome
n−1 (one field out: 57 mg/Nm³)
Redundancy check quoted
01 — Delivery model
Assessment first: why measurement precedes the proposal
A retrofit designed against assumed numbers is a guess with a purchase order attached.
Arrow Energy Co., Ltd. delivers every service — from a single-field ESP rebuild to a turnkey emission-control train — through the same three-step model: measure, engineer, execute. The measurement step exists because the numbers that size emission-control and heat-recovery equipment are site-specific and usually not what the original datasheet says. Fuel mixes drift, gas flows grow with boiler upgrades, and an electrostatic precipitator that met its limit at commissioning can be 30 years and two fuel changes away from that condition.
How does an assessment-first retrofit actually run?
First a site assessment measures the baseline: emissions in mg/Nm³ at stated O₂, gas flow, temperature, and voltage-current curves per ESP field. Engineering then sizes the fix against those numbers — SCA in s/m, collecting area in m², predicted outlet on a stated basis. Execution covers fabrication, erection and commissioning, closed out by a performance test on the same basis the baseline used.
The model protects both sides. The plant gets a predicted outcome tied to measured inlet conditions instead of brochure values; Arrow only commits guaranteed figures after the technical assessment, on a stated basis — mg/Nm³, reference O₂, dry or wet, load range. Completed work is documented the same way, in the nine-field format of the project reference database.
02 — The three steps
Measure → engineer → execute
What each step produces, and what the next one consumes.
| Step | What happens | Output |
|---|---|---|
| Measure | Isokinetic emission test, gas flow and temperature traverse, V-I curves per field, internals inspection, fly-ash sampling for resistivity and PSD | Baseline report: mg/Nm³ @ stated O₂ dry, Nm³/h, °C, field condition |
| Engineer | Sizing against measured data — SCA in s/m, collecting area in m², heat-recovery duty in kW — with the n−1 case and the effect on fan, draught and ash handling stated | Technical proposal with design basis, scope and predicted outlet |
| Execute | Fabrication at Samut Sakhon, erection in the planned outage window, commissioning and tuning | Performance test on the stated basis; handover documentation |
Between steps the numbers travel intact: the outlet concentration promised in the proposal is measured by the same method, at the same O₂ reference, as the baseline that justified it. Spare parts, installation and maintenance services are delivered under the ISO 9001:2015 scope certified by TÜV Rheinland.
03 — The services
Six services, one delivery model
Every service page states scope, method and the numbers it is measured by.
Rebuild & upgrade
ESP upgrade
From baseline test to re-energised fields: internals replacement, added collecting area, TR and controller upgrades — sized in s/m of SCA against measured inlet dust.
ESP upgrade and rebuild servicesStart-up
Commissioning
Air-load and gas-load testing, V-I curve verification, rapping optimisation and performance testing on a stated mg/Nm³ basis — for Arrow equipment and third-party installations.
ESP and boiler commissioningFull scope
Turnkey projects
Single-contract delivery from assessment through civil, mechanical, electrical and commissioning — one party accountable for the measured end result.
Turnkey emission-control projectsBy-product value
Silica extraction
Rice husk ash runs 85–90 % amorphous silica — extraction turns an ash-disposal cost into a saleable product stream.
Silica extraction from rice husk ashCombustion
Rice husk burner
Suspension firing of rice husk with the ash-handling and abrasion design the 15–20 % ash content demands.
Rice husk burner systemsMeasurement
Energy audit
The indirect-method loss map: stack loss, excess air, fouling — quantified in percentage points, ranked by payback, and used as the design basis for every retrofit that follows.
Boiler and plant energy auditFAQ
Engineering questions, answered
What does an ESP assessment include?
Isokinetic emission measurement in mg/Nm³ at stated O₂, gas flow and temperature traverse, field-by-field voltage-current curves, hopper and internals inspection, and a fly-ash sample for resistivity and particle-size distribution. The output is a baseline report and an upgrade path sized in SCA (s/m) with predicted outlet on a stated basis — before any purchase decision.
When is an ESP upgrade planned so the plant keeps running?
Into the existing outage calendar. Sugar mills take ESP work in the off-crop window; power plants in the annual overhaul. Assessment and engineering run while the plant operates; only tie-ins and internal work need the unit down. Quoting the n−1 case — 57 mg/Nm³ with one field out in our design basis — shows compliance margin during future outages too.
Does Arrow guarantee an emission figure before the assessment?
No — and a supplier who does is guessing. Design-basis figures like 24 mg/Nm³ at 6 % O₂ dry are published as illustrative calculations. Guaranteed figures are stated per project after the technical assessment, on a stated basis: mg/Nm³, reference O₂, dry or wet, and load range. That sequence is the point of assessment-first delivery.
Related engineering pages
Send us your plant data
Fuel, boiler capacity, gas flow, current emission and the limit you must meet. An Arrow engineer replies with a technical assessment basis — not a brochure.