Jinghai gas-boiler flue-gas heat recovery

Select a usable heat sink and a consistent recovery duty

Provide the boiler fuel, firing/load profile, entering flue-gas temperature, gas composition/flow and available receiving-water temperatures. Obtain the selected recovery duty, water flow and pressure drop, along with gas-side resistance. A low exhaust-temperature number does not establish the amount of usable heat without those conditions.

Check when the heat sink is available and how the package operates at low demand or seasonal shutdown. Agree bypass/control arrangements and the boiler manufacturer’s interface requirements. Do not count heat as useful annual savings if the building cannot use it at the time it is recovered.

Close the boiler draft, exhaust and plume boundary

Request the effects on draft/back-pressure, ducting, supports, exhaust temperature and the connected chimney. Define the acceptable operating range and response to recovery-unit isolation or failure. The source does not establish a draft-fan selection or the existing chimney’s suitability for changed gas conditions.

The product name promotes plume reduction, but no quantified visible-plume or pollutant test was supplied. Distinguish heat recovery, condensation and emissions compliance. Obtain the applicable measured results for the actual gas/ambient condition rather than treating the name as proof that every plume or emission limit is satisfied.

Approve condensate and materials as a real liquid stream

The source names 316L plates and reports recovered condensate. Request condensate composition, drainage capacity, treatment/discharge requirements and the wetted-material schedule. A plate material entry does not certify the corrosion resistance of the complete duct, seals, pumps or drain system for arbitrary fuel and water chemistry.

Agree sampling, cleanability, inspection and access for the heat-transfer assembly. The maintenance-free and 20-year design-life statements need an exposure and service basis; they do not remove fouling, corrosion or drainage checks. No condensate reuse quality was established, so do not assume that recovered water can enter another process untreated.

Rebuild the seasonal and payback calculation transparently

The published 2,160 t and two-season figures omit boiler size, operating duration, baseline, investment, fuel/electricity tariffs and water valuation. Build a project calculation using an agreed operating profile and the selected duty. Include auxiliary power, treatment, maintenance and any changed boiler operation.

Define whether the advertised 4.0%–11% efficiency change means percentage points or a relative increase, and establish the fuel heating-value basis. Require measured baseline and after-installation boundaries before presenting savings. The platform has not verified an independent seasonal dataset or the promoted payback.

Agree boiler-specific acceptance and handover

An enquiry should provide the boiler/stack data, usable heat sink, water chemistry, installation restrictions and required operating modes. Obtain a current thermal/gas/hydraulic selection, P&ID, material schedule and installation drawing; the reported envelope is only a source reference until matched to that assembly.

Acceptance should cover draft compatibility, pressure/leak checks, control/bypass operation, condensate handling and metered heat recovery under defined conditions. Agree service access and shutdown procedures. Current price, delivery and actual project economics remain unknown; the source-backed brief prepares a complete comparison file.

1. Match boiler and heat sink

   Define gas, water and seasonal operating conditions.

2. Approve draft and liquid interfaces

   Close chimney, controls, corrosion and condensate handling.

3. Measure the selected result

   Agree metering, baseline and economic calculation boundaries.