Environmental Solutions

Welcome to one of the world’s most comprehensive ranges of air filtration/dust collection equipment for emission control, gas cleaning and product recovery.

Industrial Environmental Solutions

John Thompson provides the right solution for the job by combining these readily available resources with years of application experience.

To maximize your investment, our experts can help you design, select, manufacture, install, operate and maintain the optimum equipment for your needs.

Helping you comply with plant emission standards

How compliant are you? Under increasing pressure from civil society and government to reduce air pollution and regard sustainability as a business imperative, more and more industrial companies are taking action to get their house in order.

Those in the know turn to John Thompson. Assisting industry players to comply with plant emission standards and avoid penalties for exceedances and licence violations, John Thompson's air pollution control capabilities are unmatched worldwide.

Air quality control - The John Thompson Difference

Whether you require a single unit or a complete system, we’re enthusiastic about meeting your needs – now and into the future. We back up our products with worldwide customer support.

We’ll be your partner

Our engineering team will work closely with you to understand your needs. Our Total Quality Commitment is proof of our partnership philosophy. You’ll experience it throughout the relationship – from the initial evaluation, system delivery and start-up, to after-sale follow-up and service.

Turnkey Air Quality Control Systems

Facing challenges with emission control, gas cleaning or dust collection/product recovery?

Our blend of experience, wide product range, proven technology and global resources makes us uniquely qualified to turn your toughest challenges into properly executed, commercially viable solutions.

Industrial Environmental Solutions

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Tubular Pulse Jet Bag Filters

To recommend the best, proven solution for your operation, we tap into a valuable resource: our comprehensive applications database. It allows us to review the efficiencies of similar applications and to see how we’ve successfully met comparable challenges.

Tubular Reverse Pulse Bag Filter

The dust-tight bag filter has three sections:

a clean-air plenum at the top
a filtration housing containing a number of cylindrical filter bags in the middle,
and a dust storage hopper at the bottom.

The filter bags are supported from a tube sheet, which separates the filtration housing from the plenum.

Dust laden air enters the collector through a diffuser. The diffuser absorbs the impact of the high velocity particles, distributes the air and reduces its velocity. The slower air speed causes the heavier particles to drop into the hopper. The air stream then flows through the filter bags, depositing the fine dust on the outside of the bag. The cleaned air continues upward into the plenum and exhausts into the atmosphere.

Filter bags are cleaned by momentary, high pressure back-pulses of compressed air from the clean-air side of the bag filter. These pulses are delivered by blowpipes, arranged over each row of bags. Orifice nozzles in the blowpipes are directed into the centre of each bag. To effectively dislodge dust along the length of the bags, the bursts of air are optimised by venturis, located at the top of the bags.

An electronic sequence controller times the cleaning cycles. A differential pressure (DP controlled) option is available to conserve compressed air consumption.

Inlet technology

Various inlet technologies are employed, depending on the specific application's requirements. These include technologies applied to the bag chamber or the hopper. Off-line cleaning technologies are used in specific cases. The choice of inlet plays a vital role in determining the performance of a bag filter.

Envelope Pulse Jet Bag filters

Beyond designing and installing large, turnkey plants, we provide the following pre-engineered products and dust control systems:

reverse-pulse cleaned filters in an envelope-designed flat bag, and
a range of compact unit mechanical shaker filters.

Ask us about our complete service of design, manufacture, supply, installation and maintenance of dust control equipment.

Our solutions control any type of dust in most industrial, mining and commercial environments.

Containerised Pulse Jet Bag filters

This is not a filter in a container – the container is in fact the filter. This makes it more affordable and easier to transport.

It’s also quicker to install.

We developed and introduced this innovative containerised reverse-pulse bag filter in 2018.

The containerised bag filter (HPC range) is a modular system. It can be a single 12 m container or multiple modules of 12 m containers. Each module contains 144 tubular bags, and has an air-filtration capacity of 4 m³/sec.

The HPC’s transportability makes it particularly well-suited for export, shipping over long distances

Reverse Air Bag filters

John Thompson offers two types of reverse-air bag filters:

Pressure filters, and
Suction filters.

For more information on pressure filters and suction filters, please download this PDF

Reverse-air baghouses are effective for applications involving extremely fine dust where low outlet emissions are required.

Bags are cleaned by reversing the airflow through the fabric.

The simple cleaning design involves few moving parts. The result: low maintenance, low operating costs and extended bag life.

Mainly employed on large fume applications such as in the ferroalloy industry.

Construction Features

Typical Applications

Wet Scrubbers

Our four different scrubber designs will meet almost any requirement:

High efficiency venturi scrubbers
Dynamic scrubber with integral fan
Vaned scrubber with no moving parts
Packed towers for gas absorption

We can provide these in several configurations and a range of sizes. Can be supplied in carbon steel, plastics/FRP or exotic stainless steels.

Ask us about engineering a wet scrubber system that efficiently meets your needs. We have the expertise, experience and resources.

Typical industries

Cyclones

High-efficiency cyclones are the most cost-effective solution for separating dry particulate (10 microns or larger) from gas streams. To keep operating costs low, careful design results in high efficiency at low pressure drop.

The mechanism of separation is:

centrifugal action of the gas (spinning action)
inertial separation from the gas (momentum of particles is higher than the gas).

Benefits:

Low initial cost
Low operating expenses
No moving internal parts
Minimal space requirements

System design:

Seemingly a relatively simple device, a cyclone consists of components which must be optimised for the application and properly work together to achieve maximum dust removal efficiency.

In designing an effective cyclone, we consider all the forces that dust particles are subjected to simultaneously:

Viscous drag or resistance due to the relative velocity between the carrier gas and the dust particle, its shape and size, and gas viscosity. Each particle must overcome resistance as it moves through the carrier gas stream.
Centrifugal force. This is affected by velocity, cyclone curvature profile and the particulate mass.
Particle inertia, whereby the particle would move in a straight line if not subjected by the other forces.

Industries:

Cyclones are suitable for use in many Industries, including:

Dust Suppression

To control dust generated in a materials handling system, dust suppression systems use the principle of agglomeration.

This process is best described as the atomisation of a water droplet to a smaller size than the dust particle to be captured. (Illustrated below).

During the operation of the dust suppression system, the dust particles are bombarded with atomised water droplets, typically sized between 3 and 30 microns.

The correct atomisation of the water droplet is critical to the effectiveness of the system, as the water droplet surface tension will repel a smaller dust particle, allowing it to escape.

The smaller water droplets attach to the dust particle, changing its density. As a result, the dust particle becomes heavier and subsequently drops out of the air stream.

The droplet size can be regulated by way of the water and air pressure controls in the main panel.

Typical spray pattern design to cover the mouth of a tipping bay

Utility Plant Environmental Solutions

Air Quality Interventions

John Thompson services, maintains, retrofits and erects electrostatic precipitators and fabric filter plants. Our technology partnership with Hamon Belgium enables us to offer our customers new electrostatic precipitators and flue gas desulphurisation plants.

Through our technology partner, Wahlco USA, we bring you a world of experience in clean air solutions. We have installed fabric filter plant on coal-fired utility boilers with capacities of 200MW and above.

Electrostatic precipitator

Design, manufacturing and construction of electrostatic precipitators
Complete refurbishment of electrostatic precipitators
Day-to-day and outage maintenance of electrostatic precipitators
Supply of electrostatic precipitator spares
Supply and installation of high-frequency power supplies

Hybrid ESP-Filter

This hybrid solution can help reduce particulate emissions to compliance. The fabric filter collects higher levels of particulate, and finer particulate, than any other ESP-filter of an equivalent footprint.

It combines an electrostatic precipitator (ESP) with a fabric filer unit with a suitable air to cloth ratio.

The fabric filter unit is located either downstream of the ESP or within the existing ESP. This is achieved by replacing one or more fields of collecting plates with the fabric filter modules.

Fabric Filter Plants

Design, manufacturing and construction of fabric filter plants
Retrofitting electrostatic precipitators with fabric filter units
Day to day and outage maintenance of fabric filter plants
Supply of filter bags and other spare parts

Flue Gas Desulphurisation

Our agreement with Hamon enables us to design, manufacture and construct flue gas desulphurisation plants.

We provide the following range of FGD solutions:

dry sorbent direct injection system
semi-dry circulating dry scrubber
semi-dry systems with rotary atomisers or spray nozzles
wet systems with lime or limestone
wet seawater desulphurisation
Day-to-day and outage maintenance services on FGD plants.

Environmental Solutions

Environmental Solutions

Industrial Environmental Solutions

Industrial Environmental Solutions

Utility Plant Environmental Solutions

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