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About Harry Zhang

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I am someone who loves reading technical books and research papers and similarly enjoys applying scientific theories (Fluid mechanics, Thermodynamics, Chemistry and Physical Chemistry) to solve engineering problems. In my leisure time, I love running, and I’ve run marathons.

With 15+ years of experience in sizing and designing air pollution control (APC) equipment and working on industrial ventilation (HVAC) systems, I am able to do field work, sales support, APC equipment selection and sizing, engineering design of a new system, and engineering calculations, based on the knowledge and hands-on experience gained through projects I finished before. You can read my blogs here to know more about my background.

Skills:

  • AutoCAD and Microsoft Office (Excel, Word, PowerPoint, Access)
  • Computer Language: Fortran and C
  • Thermal calculations (mass and energy balances, psychrometric chart, cooling and heating, and moisture control)
  • Air Pollution Control (APC) equipment (Dust collection and gas contaminants removal) selection and sizing:
    • Wet scrubbers
    • High-efficiency cyclone, standard cyclone, oversized cyclone,
    • baghouse, cartridge dust collector, ceramic cartridge filter, 
    • horizontal classifier, and drop-out box
  • Engineering design (Duct sizing and Pressure loss calculation) of Industrial Ventilation /Dust collection systems
  • Packed Tower and wet scrubbing system: pumps, expansion joints, fittings, flow meters, valves (manual and auto), spray nozzles, mist eliminator, instrumentations (pH, Conductivity, and ORP sensors and transmitters, level switch, leak detect sensor, gas sensors, etc.)
  • Piping and pump system pipe sizing and pressure loss, required pump total head and available NPSH calculations, spray nozzle required pressure calculations and control valve sizing and openness calculations for wet scrubber/packed tower/Venturi scrubber systems.
  • Piping specifications
  • Physical property calculations and estimations for gas mixture and liquid solutions: viscosity, density, vapor pressure, etc.
  • Material selection for corrosion resistance (Metal, Plastics, or FRP)
  • Air volume calculation and Determination for process ventilation
  • Thermal insulation calculations for ductwork
  • Pressure vessel calculations
  • Venting of deflagration calculations for baghouse and cyclone per NFPA 68
  • Project Turnover Package (Vendor Data Book) (IOM, QC, Equipment Data Sheets)
  • Line List, Utility List, Equipment List, Lubrication List, Instrument List, and Bolt & Nuts List
  • Bill of Material (BOM): fittings, Valves, bolts and nuts, instruments, and pumps for recirculation pump and metering pump skids
  • P&IDs, General Arrangement, & whole system Functional Specifications (Operational Specifications) & Equipment Specifications

I not only can do calculations and designs in the office, but can work as a field engineer and perform field work and field surveys too. On site, I can measure, calculate and adjust the system operation and give recommendations on system improvements based on the data from measurements and calculations.

Skills:

  • Trouble-Shooting
  • Whole system Air Balancing
  • FAT (Factory Acceptance Testing)
  • Mechanical Completion walk-through: confirmation of fabrication, assembly and nonfunctional testing of a specific system(s) or facility on site to confirm the integrity of the construction and installation.
  • SAT (Site Acceptance Testing) and Deviation List
  • Mechanical Completion Punch List: a list of items from all disciplines, discovered during SAT that must be completed prior to Commissioning 
  • New system Start-up step by step and Commissioning, including system balancing, baghouse controller optimization, and fan belt tension adjustment, setpoint optimization, etc.
  • PID loop parameters adjustment
  • Comprehensive report including: complete system airflow analysis, duct & hood design review, actual & baseline performance, etc.

Popular posts from this blog

Baghouse dye test for leak detection - 2

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  In a periodic test of a baghouse dust collection system, dye test for leak detection was done to the baghouse by following the test procedure. The system collects wood dust, and the bags were installed 4 years ago. The air after the baghouse is recirculated back to the workshop to save energy, especially in winter. The dye test easily found glowing spots on some bags adjacent to the tubesheet with the help of a black light wand (Figure 1&2) . These spots were thought to be caused by the bleed-through of the green dye powder; they were not indicators of broken bags.  We put the dye test results in the comprehensive report for this periodic system test and explained our concerns to the customer.  Figure 1 Glowing spots under black light on bags, image 1 Figure 2 Glowing spots under black light, image 2 Leak Test, Air Balancing, Trouble-shooting, and System Evaluation services by Airvate Dye test for bag/cartridge leak  Dust collection system and industrial ventil...
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Dust clogged up a baghouse

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  We were called in by a customer on one cold morning. Their dust collection system did not work when they turned on power as usual. First, we checked the ductwork to see if there was any dust accumulated inside from the sucking points, to the fan, then to the baghouse. It seemed the ductwork was not the problem. After being in the baghouse, the filtered air went back to the workshop. Then we opened the access door of the baghouse hopper, and what we saw showed us the problem: it was packed with wood dust (Figure 1).  Figure 1 baghouse hopper packed with wood dust  Later, the access door on the clean side of the baghouse was opened, and one bag was taken out, it was very clear that the dust even accumulated between bags (Figure 2). Figure 2 dust clogged up between bags After the dust was removed from the baghouse, the system was turned on. In the first 20 minutes, the baghouse was warmed up without dust loading.  When this happened, the daytime temperature outdoors w...
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Troubleshooting: Air Header got no air for the pulse jet cleaning system

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  One customer told us that their dust collection system had a very weak suction on the grinding process line, and we went to their workshop on-schedule to do troubleshooting.  Introduction of the dust collection system The dusty air from the plastic grinder first ran through a cyclone and the separated dust from the cyclone directly went back to the process; the airflow with fine particles from the cyclone went to a cartridge dust collector, and then the filtered air was released to outside of the building. Since the plastic dust is combustible, an explosion panel and a vent duct were installed on the dust collector, and a non-return valve on the ductwork just in front of the dust collector inlet. The cartridge dust collector was equipped with a pulse jet cleaning system controlled by a Photohelic pressure gauge. The Photohelic Gauge measures the Differential Pressure and provides the capability for “on-demand” cleaning in conjunction with a Timer Board. Troubleshooting proce...
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