Tower internals are the parts that make a packed column work around the packing: the liquid distributor that feeds the bed, the support plate that holds it, the hold-down plate on top, and the mist eliminator that cleans the leaving gas. Rongjian engineers and builds all of them to your column diameter, in stainless steel, carbon steel, plastic and ceramic.
These are not stock items. Each piece is sized to the tower, the packing it serves and the duty, with engineering drawings supplied for approval before fabrication. Distributors are matched to the liquid rate and turndown, support plates to the bed weight and free area, and mist eliminators to the gas velocity and droplet load.
Tower internals are engineered to each column, so there is no fixed size list. The families below are matched to your tower diameter, packing and duty, with drawings supplied for approval.
| COMPONENT | TYPE / STYLE | MATERIAL | FUNCTION | SIZING |
|---|---|---|---|---|
| Liquid Distributor | Trough, orifice-pan, pipe / spray | SS304, SS316L | Spreads liquid evenly across the bed top | Made to column diameter |
| Liquid Redistributor | Trough, wall-wiper | SS304, SS316L | Re-spreads liquid between beds in tall columns | Made to column diameter |
| Packing Support Plate | Gas-injection (hump), grid / beam | Carbon steel, SS304/316, PP, ceramic | Carries the bed while keeping a high free area | Made to column diameter |
| Hold-Down / Bed Limiter | Grid, mesh-faced | SS304/316, ceramic | Holds packing down against the vapour load | Made to column diameter |
| Mist Eliminator (Demister) | Knitted wire mesh, vane / baffle, PP drift | SS304/316, PP | Removes entrained droplets from the leaving gas | Made to vessel diameter |
Tower internals go into the same packed columns as the packing they serve, across petrochemical, chemical, pharmaceutical, environmental and power plants. The four duties below are where buyers most often order them.
We have engineered and built tower internals since 2010, out of Pingxiang, the largest packing production base in China. Because we also make the packing, the distributor, support and hold-down are designed around the exact bed they serve, across hundreds of column specifications in petrochemical, chemical, pharmaceutical and environmental projects.
We build trough and orifice liquid distributors, gas-injection and grid support plates, hold-down plates and wire-mesh, vane and PP mist eliminators, in stainless steel, carbon steel, plastic and ceramic. Each part is drawn, approved and fabricated to your column diameter, with a minimum order of one set.
Each internal is built in the material its position calls for. A distributor in a corrosive tower goes in stainless or a higher alloy; a support plate on a clean, cooler duty can be carbon steel; mist eliminators and parts for aggressive cold streams come in PP or PVDF; and for strong acid at heat the part is made in ceramic. Because the pieces are fabricated rather than bought in, the grade is set part by part across the column.
Nothing is fabricated until you have signed off the drawing. Each internal is sized to the figures that matter for it, the liquid rate and turndown for a distributor, the open area and bed load for a support plate, the gas velocity for a demister, and that design comes back to you as a drawing to approve. Only once it is approved does the part go to fabrication, so what is built is what the column was engineered for.
Every part is made to the bore of your column, not a nominal size. The distributor, the support ring and plate, the hold-down and the demister are fabricated to the shell diameter and the support details of that tower, sectioned where they must pass through a manhole and bolt up inside. Send the column diameter and the internal drawings, or the duty, and the parts are built to drop into the shell and seal.
We are a factory, not a trading company. Every product ships from our own production lines in Pingxiang. You deal with the people who actually make the product.
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We build the full set of mass-transfer internals: trough and orifice liquid distributors, liquid redistributors, gas-injection and grid support plates, hold-down and bed-limiter plates, and wire-mesh, vane and PP mist eliminators. Each one is made to the column it serves.
Yes. Tower internals are engineered, not stocked. We size every part to your column diameter, the packing it serves and the operating load, and we supply drawings for approval before anything is fabricated.
Stainless steel in SS304 and SS316L, carbon steel, PP and ceramic. The choice follows the stream: stainless and ceramic for corrosive or hot service, carbon steel where cost matters, and PP for cold aggressive duty.
A distributor sits at the top of a bed and spreads the incoming liquid evenly. A redistributor sits between two beds in a tall column and collects then re-spreads the liquid, which corrects any channelling before it reaches the next bed.
A mist eliminator catches liquid droplets carried up by the gas. The gas passes through a knitted wire-mesh pad or a set of vanes, the droplets coalesce on the surface and drain back, and clean gas leaves the top. It protects downstream equipment and cuts product loss.
Yes. We make the packing as well, so the bed and its internals are designed together. The support free area, distributor drip points and packing all match one column, which avoids the tolerance gaps you get from two suppliers.
Tower internals decide whether a packed bed reaches its rated performance. A perfect packing still underperforms if the liquid is poorly spread or the bed is not properly supported. This is how we work through a specification.
Even liquid distribution is the single biggest factor in column performance. A distributor is sized to the liquid rate, the turndown range and the column diameter, and the drip-point density is set so every part of the bed top is wetted. Trough distributors suit larger columns and higher liquid rates, while orifice-pan types fit smaller or cleaner services. Too few drip points cause channelling and lost separation, and too many raise cost and fouling risk.
A support plate has to carry the full weight of the wet packing while leaving as much open area as possible for vapour and liquid to pass. Gas-injection, or hump, support plates lift the open area above the plate so gas and liquid use different paths, which raises capacity and delays flooding. Grid and beam supports suit heavier ceramic beds. A hold-down plate or bed limiter then sits on top to keep the packing from lifting under high vapour load.
Gas leaving a column carries entrained droplets that foul downstream equipment and waste product. A knitted wire-mesh pad removes fine droplets at a low pressure drop and suits most services. Vane or baffle eliminators handle higher gas velocities, dirtier streams and viscous liquids. Plastic drift eliminators go into cooling and scrubbing towers. The element is sized to the vessel diameter and the gas velocity so it captures droplets without flooding.
The internals see the same chemistry as the packing, so the material is chosen the same way. Stainless steel in SS304 or SS316L covers most corrosive and high-temperature service, carbon steel is economical for clean duty, ceramic handles hot strong acid, and PP suits cold aggressive streams. Because we engineer and fabricate in-house, a single column can mix materials, with a stainless distributor over a ceramic support, sized and drawn as one assembly.
