Distributor feed pipe

Improper (non-symmetrical) feed piping to a distributor. Poor separation. Liquid maldistribution. Design en or. 

Solution Since the distributor annular space w as capable of handling the vapor flow, the riser was simply blanked off. Adding a hat or relocating the feed pipe w ere possible alternate. solutions. 

Figure 33 The scheme for a unit with a conical column (1) operating section (2) resin feeding section (3) solution distributor (4) filter, (5) inlet resin pipes (6) feeding resin hopper (7) pump (8) valve (9) rotameter (10) valve (11) probe collectors (12) partition (13) solution feeding filter (14) resin feeding pipe.

With long distributor pipes (>10 ft), a good practice is to "tee the feed pipe into the distributor at the center, so that the feed flows from the center toward both ends of the distributor (as shown in Fig. 2.2i). With shorter distributor pipes, one end of the distributor is usually connected to the feed nozzle, with feed flow from the inlet end of the distributor pipe toward the other end. 

Feed velocities leaving the feed pipe or feed sparger should not exceed 10 ft/s (305) and preferably be less than 4 to 5 ft/s (111). High velocities may disturb the liquid surface or cause excessive aeration in the distributor or parting box. 

When the inlet pipe directly feeds the distributor, the incoming liquid should be fed into the center of the distributor in order to ensure uniform head over all the orifices (111, 305). The feed pipe should be located about 2 to 8 in above the top edge of the distributor pan (305). It is important to ensure the feed flows into the distributor and does not enter the vapor risers. In one case (150a) poor column separation resulted from distributor feed being directly introduced into an open riser. 

Diffuser vanes are sometimes installed as a vapor distributor at the column inlet. The success of this arrangement depends on the vane design and the shape of the inlet vapor jet the latter is a function of the column feed piping configuration. This arrangement can also be sensitive to plugging, coke buildup, and corrosion. 

INTERNAL PIPE DISTRIBUTORS - FEED OPTIONS - ELEVATIONS... 

Coal and gas can be supplied to the combustor respectively via the top and the bottom of the bed. The combustor can also bum light oil, which is supphed through atomizers placed inside the distributor plate nozzles By means of three sohd feed systems, each using a screw feeder, coal, inert bed material and sorbent material are fed pnetrmatically downwards into the combustor through a common vertical feed pipe. By a pressirre lock system the pressurised storage bunkers are periodically filled from atmospheric ones. 

The solids feed pipe, which enters the combustor vessel above the bed sitrface, initially ended immediately after entering the inner vessel but it was later extended vertically to 0.2 m above the air distributor plate. In the third quarter of this year a new feed system will be installed which will inject the sohds pneumatically upwards through the air distributor plate into the combustor. 

The cooling of the bottom part of the first cyclone causes a flue gas temperature drop of about 50 °C in the first cyclone. The heated air from the cyclone cooling system, which has a temperature of about 200 °C was originally directly used as coal feed transportation air. Heat transfer from the freeboard and the fluidised bed to the air in the coal feed pipe increased the temperamre to 500 °C at the end of the coal feed pipe. To avoid burning of the coal in the feed pipe the coal feed air is cooled to 60 °C before it enters the coal feed pipe. The temperamre of the air leaving the end of the coal feed pipe is approximately 300 °C, which means that devolatilization of the high volatile coal starts already in the coal feed pipe. To avoid future problems caused by this premature devolatilization a new coal feed system, which injects the coal pneumatically upwards through the air distributor plate into the combustor will be installed in the third quarter of this year. 

This distributor is available in two different versions as a closed system with a feed pipe and as an open stem with a feed trou or a conic feed... 

Process section 1, Feed pipe 2, feed distributor 3, slot screen 4, volute race 5, pusher plate 6, basket 7, filtrate housing 8, solids housing. Drive section 9, Main shaft 10, pusher shaft 11, pusher control unit 12, danger elements 13, machine frame 14, rotor with bearings... 

Commercial chlorohydrin reactors are usually towers provided with a chlorine distributor plate at the bottom, an olefin distributor plate about half way up, a recirculation pipe to allow the chlorohydrin solution to be recycled from the top to the bottom of the tower, a water feed iato the recirculation pipe, an overflow pipe for the product solution, and an effluent gas takeoff (46). The propylene and chlorine feeds are controlled so that no free gaseous chlorine remains at the poiat where the propylene enters the tower. The gas lift effect of the feeds provides the energy for the recirculation of the reaction solution from the top of the tower. 

The perforated pipe distributor comprises a central feed sump and pipes that branch out from the sump to provide the liquid discharge. The level in the sump varies with liquid total flow rate, and the size of the lateral pipes and their perforations must be determined carefully to ensure that the ends of the pipes are not starved for hquid. The orifices are typically 4 to 6 mm diameter, and can be subject to phigging if foreign matter is present. The pipes must be leveled carefully, especially for large diameter columns. 

Feintuch [221] pre.sents calculations for a pipe distributor with tray and downcomers to disperse the reflux or feed liquid uniformly across the tray (which should not be counted as a working tray, but a distribtuion device) and... 

These distributors are fabricated of pipe lengths tied to a central distribution header (usually) %vith orifice holes drilled in the bottom of the various pipe laterals off the header. This style of distributor can be fed by pressure or gravity for clean fluids. The gravity feed is considered better for critical distillation application when uniformity of the flow of the drip points (or flow points) through out the cross-section of the tower is extremely important, and is excellent for low flow requirements such as below 10 gpm/ft2 [131]. 

Suppose that a perforated-pipe distributor made from n on will be used for a feed rate of 428 L/li. The distributor has a length of 1.8 cm (8.5% of the diameter of the bed, D = 21 cm), and length shortly less than the diameter of the bed (20.9 cm). According to the calculations, for the specific feed rate, the distributor will have four round openings with a diameter of 6.6 mm each. The distance between the openings as well as the distance between the terminal openings and the ends of the distributor is 36 mm. However, these calculations can be repeated for various feed rates to choose the optimum distributor design. 

There are three types of nonproprietary nonagitated types of extraction columns (see Figure 12). The spray columns are the simplest type of extractors, containing only distributors for the feed (often through perforated pipes). This... 

Slurry Reactors Slurry reactors are akin to fluidized beds except the fluidizing medium is a liquid. In some cases (e.g., for hydrogenation), a limited amount of hydrogen may be dissolved in the liquid feed. The solid material is maintained in a fluidized state by agitation, internal or external recycle of the liquid using pipe spargers or distributor plates with perforated holes at the bottom of the reactor. Most industrial processes with slurry reactors also use a gas in reactions such as chlorination, hydrogenation, and oxidation, so the discussion will be deferred to the multiphase reactor section of slurry reactors. 

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