Tri-NOx Multi-Chem Wet Scrubber

 

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Tri-NOx Multi-Chem (NO, NOx, NO2) Wet ScrubberSpecifications

This specification defines the design requirements, the quality and types of workmanship and materials and the performance standards and guarantees for the equipment materials and services supplied by Tri-Mer Corporation.

Scope

The Manufacturer (Tri-Mer Corporation) shall furnish all materials, labor, equipment, services, and incidentals required to provide an operable multi-stage NOx scrubber system.

It is the intent of these Specifications to provide a complete and workable system that is ready for operation. The Contractor shall furnish all equipment and controls that are necessary to automatically maintain treatment chemicals at levels required to effectively remove contaminant gases and to minimize the possibility of breakthrough due to fluctuations in gas flow or concentration.

The Contractor shall install the equipment in accordance with the Manufacturer's instructions and recommendations.

System Description

Equipment to be furnished shall include, but is not limited to: packed-bed scrubbers, oxidizers, recycle tanks, recycle pumps, chemical metering pumps, chemical storage tanks, instrumentation, control panel, motor control center, piping, and ductwork.

All equipment shall be designed to be specially adapted for the intended service.

All equipment shall be designed, constructed, and installed in accordance with the best industry standards, methods, and practices.

Scrubbers, oxidation towers, recycle tanks, and pumps shall be mounted on a coated steel frame. The frame shall include platforms and ladders which allow access to components of the scrubber system for inspection and maintenance.

The P&ID number shall identify all valves and instruments.

All materials of construction as well as miscellaneous hardware shall be resistant to attack by the compounds being absorbed and by the scrubbing solutions.

System Design

The scrubber system shall be designed to treat ____ CFM of gas at a temperature of ___ F.

The system must reduce the level of contaminants as outlined below:

Contaminant

Inlet

Outlet

NOx

____ PPM

____ PPM

A portion of the scrubbing solution shall be purged from each recycle tank in order to prevent excessive accumulation of compounds, which could reduce efficiency of the scrubber or cause fouling.

Make-up of evaporation and other water losses shall be accomplished by continuous or controlled water make-up. Fresh water shall be added to the last recycle tank to create a purge stream, which shall flow through the scrubber system countercurrent to the direction of air flow.

The equipment shall be designed for continuous operation in the environment described herein.

Equipment shall be designed for operation in seismic zone ____, at temperatures up to ____F., and with a ____MPH wind load.

Qualifications

All equipment, materials, and workmanship shall conform to good engineering practices and to the latest edition of the codes or standards published by the following organizations:

American National Standards Institute (ANSI)
National Electrical Code (NEC)
Underwriters Laboratories (UL)

If there is a conflict between the codes or standards and these specifications, the standards will prevail and an exception to the specifications should be noted.

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Submittals

Drawings and other information describing the equipment shall be submitted for evaluation and approval. Equipment will not be purchased, fabricated, or installed without review and written approval by the Purchaser.

Three (3) complete sets of drawings and other information shall be submitted to the Purchaser for review. Tri-Mer Corporation must receive written approval of design before production can begin.

General arrangement drawings for each major assembly shall be submitted. The drawings shall include Overall plan and elevation space requirements; clearance required for operation, maintenance, removal, or repair of components.

A functional description of the control system covering operation, start-up, alarms, and emergency shutdown shall be submitted.

The information which is furnished for equipment shall include name of manufacturer, model number, quantity, dimensions, materials of construction, total shipping and operating weights, anchoring requirements, power requirements, performance curves, sequence of operation, and installation instructions.

Three (3) copies of operation and maintenance instructions for the entire system shall be furnished. The information shall be sufficient to instruct someone who is not familiar with the equipment in the operation and maintenance of the system. It shall include:

  1. System description and principle of operation.

  2. Complete parts list with model and part numbers.

  3. Diagrams, illustrations, and cut sheets.

  4. Performance and nameplate data.

  5. Installation instructions.

  6. Procedures for starting, testing, and operating the system.

  7. Operating parameters and methods for proper adjustment.

  8. Steps required to correct or avoid deviations from operating limits, and consequences of such deviations.

  9. Procedure for start-up following a turnaround, or after emergency shutdown.

  10. Shutdown instructions; short, long term, and emergency.

  11. Diagnostic procedures and troubleshooting guide to be used in the event of system shutdown or malfunction.

  12. Instructions and drawings to facilitate maintenance, lubrication and overhaul of the equipment and ordering of spare or replacement parts.

  13. List of recommended spare parts.

  14. List of electrical relay, control and alarm contact settings.

  15. Electrical wiring diagram.

  16. Safety precautions.

  17. Address and phone for factory and local representatives.

Glass-Reinforced Plastic Fabrications

Glass-reinforced plastic equipment shall meet the requirements of ASTM D?3299 ("Filament Wound Glass Fiber Reinforced Thermoset Resin Chemical Resistant Tanks") for filament wound tanks, and ASTM D?4097 ("Contact Molded Glass-Fiber Reinforced Thermoset Resin Chemical Resistant Tanks") and National Bureau of Standards Voluntary Product Standard PS?15 ("Custom Contact Molded Reinforced Polyester Chemical-resistant Equipment") for custom contact molded equipment.

Vessels shall have a nameplate installed and resin coated. The following information shall be printed on the nameplate:

  1. Name of Manufacturer

  2. Manufacturer Serial Number

  3. Year Fabricated

  4. Capacity in Gallons

  5. Empty Weight of Vessel

  6. Chemical Environment

  7. Maximum Specific Gravity

  8. Design Pressure & Temperature

  9. Resin Used

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Packed End Scrubbers

Each scrubber shall be a vertical, cylindrical vessel with domed ends. Air shall enter near the bottom of the scrubber and shall be discharged near the top. Scrubbing liquid shall be applied to the top of the pack and shall flow by gravity toward the bottom of the column.

Scrubbers shall be complete, including all internals, packing, packing supports, mist eliminator, liquid distributors, air inlet and outlet, access doors, couplings or flanges for connection of instruments or plumbing, lifting lugs, anchoring lugs, and other appurtenances shown on the Drawings, or necessary for safe and efficient operation of the system.

The vessels shall be of filament wound glass-reinforced plastic construction. The resin shall be vinyl ester type.

Packing shall be a random-dumped, high-efficiency type. It shall be fabricated from polypropylene and have a nominal diameter that is commensurate with the tower diameter. Packing shall be Tri-Pack as manufactured by Tri-Mer Corporation.

The mist eliminator shall be integral to the scrubber and shall consist of several layers of mesh pad material constructed from polypropylene monofilament. The demister shall be six layers of Kimre Style 37/97 material.

Scrubbing liquid shall be evenly distributed over the top of the packing by an arrangement of spray nozzles on one or more headers.

Spray nozzles shall be a non-clogging, open-orifice type. They shall be easily removable for cleaning and shall be attached to the header with tees./p>

Access doors shall be provided at the top and bottom of the packing section to facilitate removal and replacement of the packing.

An access door shall be provided for inspection of and access to the mist eliminator.

At least one (1) access door shall be provided in order to facilitate observation and maintenance of the spray headers.

All access doors shall be a flanged opening with diameters as shown on the Drawings. They shall be located away from obstructions such as ladders, piping, and ductwork. The Manufacturer shall provide clear flange covers, gaskets, and hardware.

Gaskets for all flanged fittings or access doors shall be 1/8 inch thick full face type made from ethylene propylene rubber (EPR).

Lifting lugs shall be provided. A minimum of three are required.

Pipe supports for the recycle line shall be attached to the vessel.

Oxidation Towers

Each oxidation tower shall be a vertical, cylindrical vessel with domed ends. Air shall enter near the top of the tower and shall be discharged near the bottom.

Oxidation towers shall be complete, including all internals, mist eliminators, liquid distributors, air inlet and outlet, access doors, couplings or flanges for connection of instruments or plumbing, lifting lugs, anchoring lugs, and other appurtenances shown on the Drawings, or necessary for safe and efficient operation of the system.

The vessels shall be of filament wound glass-reinforced plastic construction. The resin shall be vinyl ester type.

Oxidizer suspension pads shall be provided at two locations in each tower to retain chemicals sprayed into the gas stream to oxidize nitric oxide. The pads consist of several layers of material that is constructed from polypropylene or PVDF monofilament. The pads shall be made from six layers of Kimre Style 37/97 material.

The mist eliminator shall be integral to the scrubber and shall consist of several layers of mesh pad material constructed from polypropylene monofilament.

Oxidizing chemicals shall be evenly distributed over the top of the suspension pads by an arrangement of spray nozzles on one or more headers. The entire liquid distributor shall be made from PVC.

Spray nozzles shall be a non-clogging, open-orifice type.

An access door shall be provided for inspection of and access to the mist eliminator and each oxidizer suspension pad.

An access door shall be provided in order to facilitate observation and maintenance of the spray headers.

Access doors shall be a flanged openings with dimensions as shown on the Drawings. They shall be located away from obstructions such as ladders, piping, and ductwork. Clear flange covers, gaskets, and hardware shall be furnished.

Recycle and Overflow Tanks

A tank shall be furnished for each reduction and odor control stage in order that scrubbing solution may be re-circulated through each scrubber. The overflow tank shall receive liquid purged from the scrubbers and oxidation towers.

Each tank shall be a vertical, cylindrical vessel with flat bottom and domed top.

Tank capacity shall provide for a minimum of two-and-a-half times the recycle rate.

The tanks shall be of filament wound glass-reinforced plastic construction. The resin shall be vinyl ester type.

Tanks shall be complete with access doors, couplings or flanges for connection of instruments or plumbing, lifting lugs, anchoring lugs, and other appurtenances shown on the Drawings, or necessary for safe and efficient operation of the system.

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Recycle Pumps

Horizontal end-suction centrifugal pumps shall be used to deliver scrubbing solution from the recycle tank to the spray nozzles in the scrubber, and to discharge effluent from the overflow tank.

Optional redundant pumps can be provided for added reliability and service. Each pump shall be sized to handle the entire flow required for proper scrubber operation.

Pumps, drivers, and auxiliaries shall be suitable for start-up and continuous operation in an outdoor, totally unprotected environment, and at any temperature within the design range.

Pumps shall be top-discharge, self-venting design with fully confined gaskets. Suction and discharge connections shall be 150# standard ANSI flanges.

An arrow to indicate direction of rotation shall be permanently attached to the pump housing by the Manufacturer.

Mechanical seals, as manufactured by Durametallic, John Crane, or Borg Warner, shall be furnished.

Pumps shall be GRP type as manufactured by Ingersoll Dresser, or approved equal.

Chemical Metering Pumps

Chemical metering pumps shall be the positive displacement diaphragm type. They shall deliver one of the following chemical solutions:

  1. Sodium sulfide

  2. Sodium hydroxide

  3. Sodium chlorite

  4. Sulfuric acid

Chemical Storage Tanks

Tanks for the storage of treatment chemicals that are necessary for the proper operation of the system can be optioned.

Chemical storage tanks shall have flat-bottom, cylindrical construction with dome or conical top. They shall be fabricated from filament wound glass-reinforced plastic. The resin shall be vinyl ester type.

Capacity of the tank shall be sufficient for ______days of operation at design conditions without need for re-filling.

Each tank shall have flanged connections for filling, overflow, pump, sight gauge, vent, drain, and level switches.

Electric Motors

Motors shall conform to the latest revision of NEMA standard publications MG1 and MG13.

Motors shall be standard foot-mounted type with rigid base design. They shall be NEMA design B (normal torque).

Motors shall be for continuous duty and shall have TEFC enclosures.

Motors shall be manufactured by Lincoln Electric Company, U.S. Motors, Baldor, or approved equal.

Pipe and Fittings

Recycle lines shall be Schedule 80 PVC or CPVC. They shall be valved so that the pump can be removed for maintenance without first draining tanks and sump.

Basket strainers to prevent objects from entering the pump suction can be optioned. The strainer shall have flanged inlet and outlet couplings. The basket shall have 3/16-inch diameter holes. The top of the strainer shall be flanged to allow access to the basket for cleaning.

Control Panel

The purchaser may choose to option an electrical power and control system.

A single control panel for the entire scrubber system shall be provided. It shall be in a NEMA 4 enclosure. All internal components shall be pre-wired.

A programmable logic controller (PLC) shall mediate control of system functions. The programmable controller shall be mounted within the control panel enclosure.

The programmable Logic Controller (PLC) shall be Allen Bradley or equal.

Control System Functions

A programmed system start-up sequence shall be provided. It shall be initiated from a selector switch that is mounted on the door of the control enclosure.

Exhaust Gas Analyzer

A continuous emissions monitor shall be furnished in order to measure concentration of nitric oxide (NO) and total NOx, and to calculate nitrogen dioxide (NO2).

The emissions monitoring system shall be Horiba Instruments Inc. Model ENDA-4120, or approved equal.

Start Up and Training

If optioned, the Contractor shall provide all labor, equipment, and utilities necessary for start-up.

The equipment supplier shall furnish the services of a factory representative, who has complete knowledge of the system and its components, to inspect the final installation, to supervise initial operation, and to train operating personnel in the proper operation and maintenance of the system.

Training sessions shall cover the following topics: system overview, safety procedures, system operation, maintenance, and troubleshooting. In addition to the standard supplied components, the purchaser may choose to option components to add to the package.

Components Supplied by Others

  1. Tie downs, guy wires, anchor bolts and foundations.

  2. Field Assembly.

  3. Field Wiring.

  4. Drain Piping.

  5. Mating flanges to customer connections, hardware and gaskets.

  6. Connecting duct from process. (See Options)

  7. Heat trace and insulation.

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