JPH0125513B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to the cooling of particulate-containing process streams, and more particularly to a method and apparatus for cooling a hot, particulate-containing process stream and separating the particulate load therefrom by sieving. Regarding.

In many industrial processes, products or by-products are produced in the form of suspended particulates, ie, solid particulate components entrained in hot gas stream components. For example, furnace carbon black is produced by the pyrolysis and/or incomplete combustion of hydrocarbon-containing feedstocks, and is usually initially produced in the form of particulate carbon black products or aerosols suspended in hot by-product flue gases. It will be done. The carbon black process stream is quenched in a carbon black forming reactor to stop the carbon black forming reaction, further cooled and then processed through a sieve to collect the carbon black product. Some other typical processes in which the present invention can be used with good results in industrial processes where a hot, particulate-laden process stream is cooled and then subjected to sieving are those of coal-fired power plant flue gas. treatment before particle overloading,
Cooling of dry cement calcined streams, cooling of calcined ore or rock dust-containing streams, etc.

Typically, commercial cloth filtration processes pass a gaseous stream containing particles through a selected porosity that is sufficient to pass the gaseous component of the process stream, but insufficient to pass the particulate component. or flowing through one or more cloth or textile elements having a transmittance. The particulate component is thus separated from the gaseous component and deposited on the upstream or collection side of the sieving element. Means are usually provided to assist in removing the particle load from the overloaded element, such as by periodic repressurization or reversal of gas flow, mechanical rocking or vibration, or the like.
The particle load thus separated is generally directed into a collection hopper and periodically removed therefrom for further processing as desired or necessary to produce packaging and/or finished particle products. In commercial furnace carbon black processes, the so-called "fluffy" carbon black collected from the filtration equipment is processed, for example, by wet pelletizing; dry pelletizing; compaction; calcination; surface oxidation with air, ozone or mineral acids; It may also be subjected to additional treatments such as grinding, such as by milling, hammer mill, or fluid energy mill; treatment with surfactants, oils or oil emulsions, etc.

The fabric material used to make the superelements is usually
It consists of woven or non-woven fabrics of textile fibers such as glass, cotton, wool, polyamide, polyester, polytetrafluoroethylene or blends thereof.
The material is shaped or sewn into the geometry required for the particle filtration device used. One commonly used filtration device is the so-called "bug filter", the filtration element of which is long and tubular. Other known screening devices use screening elements in the form of envelopes, sheets, bolts, or discs. Certain other known filtration devices employ filtration elements that are essentially intangible, where the filtration elements are simply used in the form of a wad or filler for a cartridge element through which a process stream containing particles is passed. .

However, whatever the particle filtration device used,
It is essential that the process stream containing particles introduced therein is not at a temperature so high as to be detrimental to the filtration element. Moreover, the temperature of the process stream introduced into the filtration device is also sufficient to maintain the atmosphere within the device above the dew point of the gaseous components of the process stream, thereby slowing the condensation of condensate therefrom. It is also important to be high. Of course, failure to maintain the former temperature standard will drastically shorten the life of the sieving element. Failure to maintain the latter temperature standard may result in collection of degraded and/or wet particle product and clogging of the sieving element. In the case of furnace carbon black operations, collecting wet carbon black into the sieve equipment not only adversely affects the efficiency of the collection stage, but also involves the use of other methods such as pelletizing, compacting or chemical post-treatment of the collected carbon black. The efficiency and quality of downstream finishing operations and the quality and uniformity of the resulting finished carbon black product can be adversely affected.

Although it is possible to cool a hot, particulate-containing process stream to within the aforementioned temperature criteria by means of indirect heat exchangers, the problem of efficient and economical operation of such heat exchangers arises. Typically, the target temperature for sieving particle-containing process streams is approximately 149°C.
It will range from about 371 degrees Celsius. Indirect heat exchange is usually used for heat extraction only when the temperature reduction to be achieved is relatively large, e.g., on the order of 300°C, and when the hot process stream to be cooled is at a temperature substantially above about 538°C. This is an economically justifiable method. Therefore, for example, by indirect heat exchange method
Cooling a process stream containing particles at 538°C to about 260°C generally requires fairly expensive equipment, and the economics of the process are usually not justified even when the thermal energy extracted is completely deducted. do not have. Moreover, indirect heat exchange devices are typically adapted for operation under relatively static process conditions and are therefore typically not suitable for reasonably accurate control in response to changing process conditions. Therefore, in view of these aforementioned drawbacks, the first step is to extract and subtract as much heat as economically possible from the hot process stream by indirect heat exchange, and then convert this process stream into a liquid. Further rapid cooling to a suitable fabric temperature by spraying with water is a conventional method in chemical plant operations.

Rapid cooling of this process stream to a suitable filter temperature causes liquid water to be forced into a pressure or two-fluid spray into this process stream at a point relatively far upstream of the inlet where the cooled stream enters the filter device. It is done by folding. Atomization, compared to spraying, is performed to produce fine droplets that evaporate faster as well as the relatively larger droplets that can be produced by conventional spraying techniques. A long conduit placed between the point where the cooling water is sprayed into the process stream and the sieve device is used to ensure that the liquid water particles are completely evaporated before the cooled process stream enters the sieve device. It is designed to ensure that there is sufficient time. Of course, failure to completely evaporate liquid water in the process stream leads to difficulties similar to those previously discussed with respect to agglomeration of gaseous components of the process stream within the filtration device.

The basic reason for the relatively long residence time after spraying liquid cooling water into a process stream is that, to Applicant's knowledge, neither two-fluid nor pressure sprays currently available in industrial operations produce water droplets of minute size. The fact lies in the fact that neither contributes to performance in ensuring its uniformly rapid and complete evaporation within the process stream over a sufficiently wide range of process conditions. In pressure atomization, water is forced through a nozzle with a restricting orifice, and the efficiency with which the injected water is broken up into droplets and the average size of the droplets so produced depend on the size of the orifice of the atomization nozzle and its Much depends on the pressure drop that occurs across the orifice. The flow rate of water through an orifice of a given size is then, of course, a function of this pressure drop, the greater the pressure drop, the greater the flow rate. Even small changes in any of the aforementioned parameters have a very strong influence on the uniformity and size of the water droplets produced. For most industrial chemical plant installations, the orifice size of a given pressure spray nozzle may be considered a constant parameter. However, this is not the case with respect to flow rate and pressure drop. In industrial plant operations, the pressure and flow rate of water lines and the temperature and flow rate of the process stream to be quenched are typically subject to considerable variation. When the temperature and/or flow rate of a hot process stream is varied, such as by changing the conditions of the reactor to change the properties of the product, typically to achieve the desired target temperature for preparation of the fabric filter treatment. It is also necessary to vary the amount of cooling water sprayed into the process stream. Therefore, significant changes in the water pressure applied to the spray nozzle may occur incidentally or by design and during periods of process operation where the pressure spray nozzle does not and cannot operate to its design pressure drop and flow values. Can be connected. Under such conditions, the droplets produced by pressure atomization become much larger and the uniformity of the droplets is reduced, so this quenching process is necessary to ensure complete evaporation of water in the process stream. requires a considerable amount of time in the process stream. A two-fluid atomizing nozzle uses a motive gas to break up a water stream into fine droplets within the nozzle and inject the droplets contained in the motive gas into a process gas stream. In order to operate efficiently, such two-fluid nozzles generally use relatively high flow rates of motive gas, which gas is not normally available indigenously on the factory floor, and which in any case is It ultimately represents an additional gas load on the process stream that must be handled by downstream filtration equipment.

A common method for maximizing the residence time of pressure or two-fluid spray cooling water in a process stream is to use a large volume conduit or so-called "risepipe" to spray the cooling water into the process stream, as described above. The solution was to intervene between the point and the cloth filtering device. Under these conditions, where the atomized cooling water droplet size is relatively large, its evaporation rate can be greatly reduced within the process stream flowing through the riser. In furnace carbon black operations, such a reduction in evaporation rate increases the chance of wetting and agglomeration of the particulate components of the process stream in the riser, with a significant amount of hard, coarse agglomerates present therein. This will lead to the collection of carbon black products. Moreover, in view of the fact that this process stream can often be highly corrosive, this riser conduit also often needs to be made of expensive corrosion-resistant alloys. Nevertheless, heretofore the need to avoid the presence of liquid in the sieving equipment has outweighed the considerable economic disadvantages imposed by the construction and operation of preceding bulk corrosion-resistant alloy risers and the need to avoid the presence of liquid in the riser. Until the advent of the present invention, the industry was unable to achieve complete evaporation of the cooling water introduced into the process stream over a wide range of process conditions. These shortcomings were grudgingly accepted in order to ensure that.

According to the present invention, many of the above-mentioned difficulties are completely resolved or at least substantially ameliorated.

The main object of the invention is to provide a new method for cooling hot, particle-laden gas streams.

Another object of the invention is to provide a new device for cooling a hot, particulate-laden gas stream.

Another object of the present invention is to provide an improved integrated method for separating particulate components from hot, particulate-containing process streams.

Another object of the present invention is to provide an improved integrated system for separating particulate components from hot, particulate-containing process streams.

Yet another object of the present invention is to provide an improved integrated method and system for separating furnace carbon black from hot, furnace carbon black-containing process streams.

Other objects and advantages of the invention will be apparent in part and in part hereafter.

According to the invention, a hot, particulate-laden gas stream is directed through a bench lily-shaped conduit whose shape and dimensions are adapted to accelerate the process stream to a Matzha number of at least 0.25. Within the throat of this bench lily conduit, liquid water is injected generally laterally into the gas stream through a number of unconstrained orifices. Due to the strong flow of the process stream at the point of introduction of liquid water,
The multiple water streams are rapidly fractured, broken up, and sheared into uniform droplets of relatively fine size,
Heat is thereby extracted from this gas stream by rapid evaporation of the water droplets thus created. The thus cooled gas or process stream is directed to a sieve device where the particulate components are separated from the gaseous components.

Now, referring to Figure 1, the conventional furnace carbon black process line has main elements 1,
9, 14 and 15 are included. A feedstock containing hydrocarbons, a fuel and a gaseous oxidant (usually air) are introduced into the carbon black reactor 1. The resulting mixture is then ignited and the flaming reaction mixture is passed into a refractory-lined reaction chamber 5, where carbon black-forming conditions are maintained. Conventionally, the temperature within reaction chamber 5 is maintained between about 1315 DEG C. and about 1760 DEG C., the exact temperature depending primarily on the desired properties of the carbon black product. Control of the temperature within reaction chamber 5 is normally achieved by appropriate distribution of oxidant, fuel and feedstock delivered to reactor 1. The termination of this carbon-forming reaction is initiated by a so-called "primary quenching" in which water is sprayed into the reaction mixture from a nozzle 6 as it advances downstream of the reaction chamber 5. The rate at which this quench water is sprayed into the reaction mixture is approximately proportional to rapidly reduce the temperature of the process stream to about 1204°C or less. Since the thermal energy contained in the reaction mixture at this point in the process is relatively high, it is inherent to ensure that rapid evaporation of the primary quench water occurs, and therefore operation of the quench nozzle 6 is usually not critical. do not have.

The resulting process stream containing carbon black suspended in the process flue gas is then led from the reactor 1 to an indirect heat exchanger 9 where the process stream is
It is further cooled, usually to a temperature between about 426°C and 648°C. Indirect heat exchanger 9 is conventionally cooled by the combusted oxidant used in the carbon black formation process, thereby preheating the oxidant before its introduction into reactor 1 and thereby otherwise discarding it. This improves the thermal efficiency of the entire process by recovering a significant amount of the heat generated.

This separation of carbon black from the process stream is conventionally accomplished using a sieve device, such as a bag filter, in which the process stream is directed through a porous sieve element that allows the process gas to pass through but retains the carbon black load upstream. It will be held during the 15th. The carbon black product separated and collected in the filtering device 15 is then packaged or otherwise processed as described above.

In order to protect the filtering elements of this filtering device 15, the still relatively hot process stream exiting the indirect heat exchanger 9 is typically kept between about 149°C and about 371°C, with the exact target temperature being mostly that of the process stream. Further cooling is primarily required to a temperature dictated by considerations of both the dew point of the gaseous components and the thermal stability of the particular sieve element used in sieve device 15.

Conventionally, this additional cooling or "secondary quenching" of the furnace carbon black process stream prior to its passing through involves the use of a partially cooled process stream from the indirect heat exchanger 9 while spraying water at its upstream end. ,
This is accomplished by leading into a vertical, long, large volume conduit or riser 14. For comparison, the riser 14, for example, typically has a length of about 30.48 m, a diameter of about 1.524 m, and is usually made of an expensive corrosion-resistant alloy. Located at the upstream end of riser 14 is one or more pressure or two pressures at which quench water is sprayed into the process stream at a rate sufficient to cool the process stream to a selected target temperature. A fluid spray nozzle 16. Nozzle 16 of riser pipe 14
A large section extending downstream from the filter is provided for the purpose of ensuring sufficient residence time of the quenched process stream to complete evaporation of the quench water spray before the process stream enters the sieve device 15. It is being For whatever reason, if the atomized water droplets are of relatively ^large size, e.g. While the flow passes through the riser 14, it creates a significant opportunity for significant contact of the liquid water with the suspended particulate component, carbon black. As previously discussed, if wetting of such carbon black particles occurs, the wet particles then collide with each other to form coarse agglomerates. The wet carbon black particles also contact the walls of the riser 14, causing swelling and carbon black caking thereon.

According to the present invention, referring now to the solid line portion of FIG.
The relatively hot, particulate-containing process stream exiting the conduit is directed through a bench lily conduit 20 having a geometry adapted to accelerate the stream within the conduit throat 24 to a Matzha number of at least about 0.25. “Matsuha number”
is the dimensionless coefficient of the actual velocity of the process stream divided by the local velocity of sound within the stream. Therefore, the Matsuha number of a process stream is both temperature and composition dependent, and can be determined for any given set of environments by taking fully into account the temperature and composition of the particular process stream involved. You can easily decide. Preferably, the geometry of the bench lily conduit 20 will be selected to accelerate the process flow within the throat 24 to a Matzha number of at least 0.4.

The ventilated conduit 20 includes a relatively steeply converging upstream section 22, a throat section 24, and a relatively gently widening downstream section 26. In the particular embodiment of the invention shown in the drawings, the feed tube 25 is centered along the longitudinal centerline of the throat 24, terminating in an end cap 27. The supply tube 25 is supported in its central position by a strut 28 extending from the wall of the convergent section 22 of the ventilated conduit 20. End cap 2
7 includes a plurality of unconstrained orifices 29 oriented radially with respect to the longitudinal centerline of the bench lily conduit 20 and through which liquid quench water is introduced generally laterally into the process stream flowing through the throat 24. Ru. Control of the flow rate of the quenching water through the orifice 29 may be performed by a combination of a water supply valve 50 and a controller 51. The control device 51 is an outlet thermocouple.
receiving process stream temperature data from T ₀ and organizing the data with respect to a predetermined target or setpoint temperature;
It then responds by adjusting the water supply valve 50 as necessary to obtain the set point temperature of the quenched process stream. Because the present invention relies primarily on the kinetic energy of the accelerated process stream to break up the quench water into fine droplets and disperse the droplets within the stream, the diameter of the unconstrained orifice 29 and the rapid The pressure (or flow rate) at which chilled water is supplied is subject to considerable variation and is usually not critical with regard to the performance of fine, uniform, and rapidly vaporizable droplets within the process stream. This advantageous feature of the present invention is a significant difference from the harshness normally associated with the operation of prior art pressure or two-fluid atomizing nozzles. Desirably, the number and diameter of the orifices 29 are such that sufficient pressure is applied to each of the orifices 29 and then into the process stream for the intended range of quench water velocities involved in the particular process under consideration. It will be chosen to cause the resulting quench stream to be jetted at least a short distance from the face of the end cap 27 before substantial disintegration and destruction of the quench stream.

The angle of divergence of the flared portion 26 of the bench lily conduit 20 is generally not critical. Preferably, however, the divergence angle is between about 6° and about 14°, and more preferably between about 7° and about 10°. By adhering to these preferred limits, the flare 26 generally acts as a diffuser, thereby minimizing the pressure drop that occurs across the conduit 20 for a given acceleration of the process stream and acts to extend the length of the range in which the motor maintains high speed. In another preferred embodiment of the invention, at least the flared portion 26 of the benthic conduit 20 is thermally insulated, for example by lagging 30. The insulation 30 serves to reduce the thermal deposition driving force of the hot process stream that would otherwise tend to cause the deposition of at least some of its particulate components on the immediately downstream surface of the throat 24. Maybe.

In another preferred embodiment of the invention, the upstream end of the convergence 22 of the benthic conduit 20 is supplied by a short conduit 18 containing a rectifier 19. Providing such a rectifier immediately in front of the bench lily conduit 20 minimizes turbulence and eddy currents in the process stream as it approaches the conduit 20, thereby ensuring efficient acceleration therein. .

In view of the extremely rapid decomposition and evaporation of the quench water introduced into the process stream according to the invention, both the ventilate conduit 20 and the conduit 31 connecting the downstream end of said conduit 20 with the inlet of the screening device 15 are , based on the same process metrics, can be substantially more compact than prior art riser type secondary quench systems. This represents a substantial benefit accruing to the method of the present invention since, as previously indicated, prior art secondary quench riser systems typically utilize equipment of relatively large length and volume. Using the process and apparatus of the present invention, for example, a furnace carbon black process stream of the same type as contemplated with the standpipe 14 dimensions previously described would have an inlet and outlet diameter of approximately 0.8128 m, a throat diameter of approximately 0.4064 m, and a throat diameter of approximately 0.4064 m. The bench lily conduit 20 of the present invention having an overall length of between about 3.6576 m and about 4.572 m can be effectively cooled to the target temperature. Additionally, the length or volume of the conduit 31 is substantially the same as that of the chilled process stream filtration device 15.
dictated solely by the need for a fluid-tight connection to. Moreover, the apparatus of the present invention does not have to be vertically oriented like prior art standpipes, but rather can be in any orientation suitable based on available space and efficient plant layout considerations.

Additionally, the present invention exhibits substantially less sensitivity to changes in process inlet temperature than prior art riser methods that use pressure sprays of quench water. Used in the latter prior art method, for example, a reduction of about 38° C. in the inlet temperature of the process stream fed to the riser 14 is required to be pressure sprayed into this process stream to achieve the target temperature. Water speed is reduced by about 20%. However, if we reduce the water pressure by adjusting the water flow rate downward by 20%, the average droplet size of the pressure atomized spray increases significantly, as does the residence time required to evaporate such large water droplets. increases, and the volume of downstream surrounding conduits required to provide such long residence times also increases significantly. However, using the process and apparatus of the present invention, a similar reduction in process stream inlet temperature and a similar reduction in quench water velocity result in only a relatively small increase in water droplet size and complete evaporation of this water droplet. This results in only a relatively small increase in the residence time required. Therefore, unlike prior art riser systems, the apparatus of the present invention simply provides an adequate residence time buffer to complete quench water evaporation in response to temperature and flow rate changes in the process and quench water stream. There is usually little or no need to create additional downstream conduits of length or volume. Also, although the capture and decomposition of the quench water introduced into the process stream as a result of the method of the present invention may be called a type of two-fluid atomization, the motive gas for the atomization of the quench water is external. Rather than a diluent, the process stream and the motive gas are one and the same entity. Therefore, the present process and system eliminates the need for further dilution of the process stream and increase in gas handling capacity of the sieve device 15.

Although the present invention has been described in detail above only with respect to a furnace carbon black process line and in terms of final separation of particulate components by sieving, the present invention is capable of cooling a hot gaseous process stream containing suspended particulate solids. It is clear that it can be usefully applied to many other chemical process lines where there is a need to

Additionally, while the invention has been described above with respect to certain preferred embodiments thereof, it should be noted that the above description is intended to be illustrative in nature and not to limit the invention. For example, the particular apparatus shown and described includes an end cap 27 centrally located within the throat 24 of the bench lily conduit 20, which end cap 27 is the final element for introducing quench water into the process stream. used as, but
It is clear that other mechanical equivalents of this arrangement can be achieved. For example, a device for introducing quenching water can be provided by penetrating the surrounding wall and using a bench lily conduit 20.
It may also take the form of a plurality of radial quench water orifices disposed around the throat 24. The orifice may then be surrounded by a common manifold with a water supply pipe thereto.

Obviously, many other suitable alternatives and equivalent configurations of the apparatus and method of the present invention will be apparent to those skilled in the art. It is therefore to be understood that all such changes, alterations, modifications, etc. are intended to be within the essential spirit and scope of the invention as defined by the appended claims.

[Brief explanation of drawings]

FIG. 1 is a schematic flow diagram depicting, in solid lines, a cooling system according to the present invention incorporated into a typical furnace carbon black process line, and, in dotted lines, a prior art cooling system on a relative comparative scale. It is. FIG. 2 is a schematic longitudinal sectional view of the embodiment of the cooling device of the present invention shown in FIG. FIG. 3 is an enlarged schematic vertical sectional view of the cooling device shown in FIG. 2. DESCRIPTION OF SYMBOLS 1... Carbon black reactor, 9... Indirect heat exchanger, 15... Cloth filtration device, 18... Rectifier, 20... Bench lily type conduit, 22... Narrowing upstream part, 24... Throat part, 25... Supply pipe, 26
... Spread downstream, 27... End cap, 29...
... Orifice, 50 ... Water supply valve, 51 ... Control device, T ₀ ... Thermocouple.

Claims (1)

Claims: 1. A method for cooling a hot, particulate-laden gas stream in preparation for collecting particulate components from the hot, particulate-laden gas stream, comprising: a liquid sprayed into the stream; in a method comprising spraying liquid water into the stream in such an amount as to remove heat from the stream by evaporation of water and cool the stream to a temperature above its dew point, The gas flow includes the upstream convergence section 22, the downstream widening section 26, and the throat section 24 therebetween.
and directing the gas flow at the throat 24 at least about
Accelerate to a Matsuha number of 0.25, and the throat 24
and is conducted through a relatively compact bench-lily conduit 20 which introduces the cooling water to be atomized in multiple streams substantially laterally into the gas stream. 2. In the method described in claim 1,
A method characterized in that in the throat 24 the hot, particle-laden gas stream is accelerated to a Matzha number of at least about 0.4. 3 In the method described in claim 1,
an element 27 in which the liquid water is centrally located within the throat;
into the gas stream substantially laterally and outwardly from the element 27, characterized in that the element 27 has a plurality of radially oriented unconstrained orifices 29. 4 In the method described in claim 3,
The velocity of the water introduced from said element 27 is sufficient to jet each of the resulting streams of liquid water into said gas stream at least a short distance from the face of said element 27 before substantial disintegration and destruction thereof. A method characterized by: 5 In the method described in claim 1,
The method characterized in that the downstream flare 26 has an included angle in a range between about 6 degrees and about 14 degrees. 6 In the method described in claim 1,
A method characterized in that at least the downstream extension 26 of the bench lily conduit 20 is thermally insulated. 7 In the method described in claim 1,
Bench lily conduit 2 for hot, particulate gas stream
A method characterized in that the flow of the gas stream is rectified substantially immediately before its introduction into the upstream section 22 of the zero convergence in order to reduce eddy currents and turbulence therein. 8. A method according to any one of claims 1 to 7, characterized in that the hot, particulate-laden gas stream is a furnace carbon black process stream. 9. An integrated method for separating particulate components from a hot, particulate-containing gas stream, comprising spraying liquid water into the stream, thereby removing the liquid water so sprayed into it. cooling the hot, particle-laden gas by removing heat from the stream by evaporation, and then directing the so-cooled particle-laden stream through a sieving device 15; The amount of water so sprayed makes the stream low enough to prevent damage to the filtration elements of the device 15, but keeps the atmosphere within the device 15 free of the gaseous components of the particle-laden gas stream. In a manner sufficient to cool the hot, particle-laden gas stream to a temperature high enough to maintain it above the dew point, it is 24
accelerating the stream at the throat 24 to a Matzha number of at least about 0.25, and at the throat 24 substantially transversely displacing the streams of the water to be atomized into the gas stream. cooled by conducting it through a relatively compact bench lily conduit 20 that introduces the
A method characterized in that the rate of liquid water so introduced is proportional to cooling the stream within the aforementioned limits. 10. The integrated method of claim 9, characterized in that in the throat 24 the hot, particulate gas stream is accelerated to a Matzha number of at least about 0.4. . 11. An integrated method according to claim 9, characterized in that the sieving device 15 is a bag filter. 12. In the integrated method of claim 9, the liquid water is introduced substantially laterally and outwardly into the gas stream through an element 27 centrally located within the throat 24. and wherein the element 27 has a plurality of radially oriented unconstrained orifices 29. 13. In the integrated method of claim 12, the velocity of water introduced from said element 27 causes each resulting stream of liquid water in said gas stream to undergo substantial decomposition and destruction. A method characterized in that it is sufficient to inject at least a short distance from the face of said element 27 beforehand. 14. In the integrated method of claim 9, the temperature of the cooled gas stream is continuously monitored and the rate of water introduced into this hot, particulate gas stream is adjusted accordingly. A method characterized in that the method is adjusted according to the following: 15. The integrated method of claim 9, wherein the downstream extension 26 has an included angle in the range between about 6 degrees and about 14 degrees. 16. The integrated method of claim 9, characterized in that at least the downstream extension 26 of the bench lily conduit 20 is insulated. 17. In the integrated method of claim 9, substantially immediately before introduction of the hot, particulate gas stream into the upstream convergence 22 of the ventilate conduit 20, said gas stream is A method characterized in that the flow of is rectified to reduce eddy currents and turbulence therein. 18. An integrated method according to any one of claims 9 to 17, characterized in that the hot, particulate-laden gas stream is a furnace carbon black process stream. Method. 19 An integrated apparatus for separating particulate components from a hot, particulate-containing gas stream, comprising: a conduit adapted to pass the hot, particulate-containing gas stream; a device for atomizing liquid water and thereby cooling said stream by evaporation of the liquid water sprayed therein, and receiving a gas stream containing so cooled particles from said conduit; In a method comprising a sieving device 15 for separating particulate components from gaseous components thereof, the conduit is relatively compact bench lily shaped having an upstream converging section 22, a downstream widening section 26 and a throat section 24 therebetween. A conduit 20 and a plurality of streams of liquid water are routed through the throat 2.
4, the sieve device 15 is placed substantially sideways into the gas stream.
cooling the gas stream sufficiently to prevent damage to the sieve elements of the sieve, but maintaining the temperature of the atmosphere within the sieve device 15 above the dew point of the gaseous component of the cooled gas stream; the ventilary conduit 20 is configured to accelerate the hot, particulate-laden gas stream in its throat 24 to a Matzha number of at least about 0.25. A device characterized in that it has dimensions. 20. An integrated device according to claim 19, characterized in that the sieving device 15 is a bag filter. 21. The integrated apparatus of claim 19 further including a rectifier 18 located substantially immediately upstream from the upstream convergence 22 of the bench lily conduit 20; is hot,
A device characterized in that it is adapted to reduce eddy currents and turbulence in a gas stream containing particles. 22. The integrated apparatus of claim 19, characterized in that the downstream flare 26 of the bench lily conduit 20 has an included angle in the range between about 6° and about 14°. device to do. 23. In the integrated device according to claim 19, the device for introducing multiple streams of liquid water comprises an element 27 centrally located within the throat 24 of the bench lily conduit 20. and the element 27
the element 27 includes a plurality of radially oriented unconstrained orifices 29;
A device characterized in that the water supply pipe 25 extends through the side wall of the bench lily conduit 20. 24. In the integrated device according to claim 19, a temperature sensing device T ₀ located between the downstream end of the bench lily conduit 20 and the inlet to the sieving device 15, the throat section 24 valve arrangement 5 for controlling the rate of liquid water introduced into the gas stream of
0, and the valve device 50 communicates with the temperature detection device T ₀ and in response to the temperature detected by the temperature detection device T ₀ .
A device characterized in that it includes a control device 51 operative to control. 25. In the integrated apparatus of claim 19, the geometry of the bench lily conduit 20 accelerates a hot, particle-laden gas stream in its throat 24 to a Matzha number of at least about 0.4. A device characterized in that it is configured to: 26. An integrated device according to claim 19, characterized in that at least the downstream extension 26 of the ventilary conduit 20 is thermally insulated. 27. The integrated apparatus of claim 19, characterized in that the downstream flare 26 of the bench lily conduit 20 has an included angle in the range between about 6° and about 14°. device to do. 28. An integrated device according to any one of claims 19 to 20, further comprising an indirect heat exchanger 9 leading into and upstream of the bench lily conduit 20 and an indirect An apparatus characterized in that it comprises a furnace carbon black reactor 1 communicating with and upstream of a heat exchanger 9.