The method of supplying liquid absorbent for sprinkling on sulfur-containing flue gas in the absorption tower for desulfurization of flue gases and a device for its implementation

 

(57) Abstract:

Usage: the invention relates to a process for the desulfurization of flue gases, and more specifically to a method and device for the implementation of desulfurization in a shorter absorption tower. The inventive in the way that collectors are placed on the outside of the tower. Or post at least two manifold on the same side of the tower. Both manifold on the same side of the tower can be shifted in a vertical direction relative to each other. In the device, each of the collectors 3 are adjacent to the tower from the outside. The device is equipped with a node of a pump in each of the above-mentioned liquid collector absorber. Each header and its corresponding supply piping made decreasing in diameter throughout its length. 2 C. and 14 C.p. f-crystals, 8 ill.

The invention relates to a process for the desulfurization of flue gases, and more specifically to a method and device for the implementation of desulfurization in a shorter absorption tower.

The known method and device for feeding the liquid absorbent splattering on the flue gas in the absorption tower for desulfurization of flue gases, in which the absorbent is served in bash is in, connected to each collector, each supply pipe is placed in the tower so that it alternately crosses the path of flow of the combustion gases in the same or nearly in the same plane inside the tower, and send the liquid absorbent in the flue gas inside the tower, desulfurase him thereby.

However, the dispersion according to this method is from two or more reservoirs, and consequently, of the two or more levels inside the tower that leads to an increase in the height of the tower, increasing the operating costs of the tower.

The technical result of the claimed invention is to reduce the height of the tower and reducing power consumption. This technical result is achieved due to the fact that in the method of supplying liquid absorbent for sprinkling on sulfur-containing flue gas in the absorption tower for desulfurization of flue gases with inlet and outlet for the flue gases, is that the absorbent is fed into the tower through at least two collector, pass the liquid absorbent in the tower through a lot of feed lines connected to each collector, each supply pipe is placed in the tower so that it alternately paint on residual gas inside the tower through a series of nozzles, attached to each of the supply pipeline, the collectors are placed on the outside of the tower.

In fact, at least two collector can be placed on the same side of the tower, and both the collector on the same side can be shifted in a vertical direction relative to each other.

At least two collector can be positioned on opposite sides of the tower.

The absorbent material can be fed through a four-manifold, every two of which are positioned on opposite sides of the tower.

At least two collector located on opposite sides of the tower, may be coplanar.

In addition, to achieve a technical result in the feeder liquid absorbent for spraying at least one layer of the dispersion to flue gas in the absorption tower for desulfurization of flue gases, in which each level of the dispersion includes at least two elongated manifold for flow of the liquid absorbent in the tower, many elongated feed lines attached to each of the collector and passing inside the tower, and the supply piping located so that alternately preseka is asados, attached to each of the supply piping, and nozzles are configured to spray the liquid absorber in the flue gas inside the tower, each of the collectors is made adjacent to the tower from the outside.

The device may be provided with a node of the pump in each of the above-mentioned liquid collector absorber.

In addition, each header and its corresponding supply piping can be made decreasing in diameter throughout its length.

In the device, at least two collector can be located on the same side of the tower, and collectors on the same side of the tower can be shifted in a vertical direction relative to each other.

In the device, the reservoir can be located on opposite sides of the tower.

The device may have four collector, every two of which are located on opposite sides of the tower, and at least two of the reservoirs located on opposite sides of the tower, may be coplanar.

In addition, the device may include means for distributing the gas flow to provide a uniform flux is broken, typical absorption tower for flue gases, illustrating the nozzle placed inside the tower; Fig. 2: General view, partially in section, of the invention, representing the dispenser located inside the tower; Fig. 3 a top view, partially in section, of the nozzle located inside the tower; Fig. 4 A-C, the image of the individual elements, partly in section along the line A-A of Fig. 3, illustrating possible locations for the collectors of Fig. 5 is a view in section along the line b-B of Fig. 3; Fig. A-E is a schematic depiction of some of the various attachments that can be used in accordance with the invention; Fig. 7 a top view, partially in section, of an alternative construction of dispenser having only two collector of Fig. 8 a top view, partially in section, of another version of the design atomizer with only two collector.

In Fig. 1 shows a typical absorption tower 1 system for desulfurization of flue gases 500 MV. This is a typical tower rises up 36.9 m above the ground and is about 18 m in diameter. It contains the dispenser 2 with each step, which usually copy the upper and lower level located at a distance of 1.5 m from each other.

In this previous con is 1 covered by the spray and the ratio of fluid to the magnitude of the gas flow (W/G), necessary to obtain the desired output of sulfur dioxide were provided with independent pumps are a great power. This spray, which causes the loss of sulfur in the flue gas in the sediment under the condition that the nozzle is in contact with the entire volume of the combustion gases, ensuring effective operation of the system.

In contrast to this typical system of Fig. 2 shows the present invention in which you want the dispenser for operation of the system. This sprayer requires design, which is about 18 m in diameter, but it is elevated above the ground only 29.6 m savings of about 7.3 m height of the absorption tower. Moreover, the present invention allows to capture spray the entire volume of the flue gas to sulfur recovery, while the need for additional room spray remains.

In Fig. 3-5 is shown, as is achieved by reducing the height of the absorption tower. In this design one step spray 2 consists of four separate external reservoir 3, each has a number of parallel supply pipes 4 connected with them. These separate supply piping 4 decrease or decrease in diameter as the Yes of fluid flow, in each of the supply pipe 4, when he crosses the absorption tower 1. You want to keep the pressure as constant as possible along the length of each of the supply pipe 4 and to maintain a reasonable speed through the pipeline. It should also be noted that each collector 3 becomes smaller in diameter along its length is largely for the same reasons.

As shown, this design contains two collector 3 on opposite sides of the absorption tower 1 (total of such headers 3 four in this design). The opposite side in this invention are mirror image of each other (in the same basis, but deployed to 180). Each pair of manifolds on the same side of the absorption tower 1 is located vertically and sometimes horizontally, at a small distance from each other. This is done so that the supply piping 4 on this side (and preferably on both sides) were located in the same plane inside the absorption tower 1.

In Fig. 4A lower manifold 3 is located in a given plane, while the upper header 3 is displaced horizontally and vertically relative to the lower manifold 3. It's three in the same plane, as the supply piping from the bottom of the collector 3. In Fig. 4B, the plane of the feed lines 16 is located between the two reservoirs 3 in such a way that each supply pipe respectively oriented. In Fig. 4C upper manifold lies in the plane of the supply piping. In any case, regardless of how focused the reservoir 3, the supply piping 4 are mounted so that are in the same plane are coplanar within the absorption tower 1, as shown in Fig. 5. The system design DTG will determine the number of required pumps and reservoirs 3. See option two collector 3 on each side. Another option includes two collector 3 on one side and one on the other, or three on one side and none on the other, or any other option from zero to four collectors 3 on each of the opposite sides of the tower 1.

In Fig. 3 corresponding to the supply piping 4 are staggered so as not to duplicate the coverage of the relevant areas within the absorption tower 1. The opposite side absorption tower 1 contains duplicate pipelines deployed 180oin relation to the supply pipes of the absorption tower 1. In such an interconnected and curved design of the entire space inside the adsorption tower 1 is covered by the spray from each collector 3 and the supply pipe 4, which is powered. In reality, however, there is a significant overlap areas subjected to sputtering, so that any collector 3 and its corresponding supply piping 16 can be disconnected and used as a backup if necessary without disturbing the process of extracting sulfur. That is, you want the spray through only three collectors to achieve the specified parameters extraction of sulphur, so that any of the four reservoir 3 can be idle without affecting the process of extracting sulfur. The reservoir 3 can be oriented to be supplied spray at either end or at any point along its entire length. Usually collectors 3 are large at the point of supply and reduced as described earlier.

The described configuration of the spray can be used in any irrigated system DTG, including dual alkali, lime or limestone with magnesium, limestone, limestone with forced oxidation, lime, sodium, etc. Advantage is that the height benatia the nozzles 2. In addition, the size of the dispersion is maintained without the necessity to use a separate stage atomizer 2.

It should also be noted that each collector 3 is usually connected with its own pump (not shown) so as to be independent from other collectors 3. In this case, it is desirable to have the spray only from two reservoirs 3, the other two pumps for collectors can be disabled without affecting the spraying speed or the flow rate from the two reservoirs 3, operating at this time. In addition, if there is something unexpected in one of the systems, it can be disabled to troubleshoot without disrupting the absorption tower 1. Further, since all the collectors 3 are located at the same height, less energy is required to pump in accordance with the present invention in comparison with the adsorption towers, containing a multi-stage nozzles. The reason is that each pump should apply the mixture on one height, and less than is necessary in the tower with a multi-stage spray.

Ideally, this invention needs extra protection in order to eliminate the fraying during spraying. Besides teawow, suitable for use in an environment within the absorption tower 1. Manifolds can have tolazoline, welded, glued, screwed, etc. elements. This invention is also suitable for use with or without gas distribution, pallet, hardened design, preliminary neutralization or with the use of the device 5, which is located under the spray. In Fig. 1 and 2 shows the pallet 6. When you use the device under the nozzle 5, the capacity of the spray can be concentrated in this device 5 in the same way as described above.

In Fig. 6A-E shows the model of the nozzles 7 for use in the supply piping 4. Fig. 6A illustrates the type nozzles with a single coil, while Fig. 6B shows a single straight nozzle. In Fig. 6C, 6D and 6E, respectively, showing a double spiral (or direct) nozzles, dual rectangular nozzle with a Central connection with the supply pipe 4 and a double rectangular nozzles tangentially connected with the supply pipe 4. Of course, the number of nozzles, the type and the device depends on system functions DTG and the required output of the sprayer. The total coverage increases when the nozzle 7 is positioned relative to the first location of the supply pipe 4 and the nozzle 7. In some systems, often there are about 250 nozzles on the manifold 3, which means that there are about 1000 nozzles throughout the system. These nozzles can be attentively, covered, welded or twisted with the supply pipes 4 and oriented for spraying up, down, or under any lateral angle.

Should also be considered within the scope of this invention the ability to use the invention with an internal reservoir, in contrast, shows an external collectors Z. As you can guess, external collectors have a system of branched pipelines outside of the adsorption tower 1, while the internal reservoirs are located in the adsorption tower with numerous drainage piping inside the tower, providing full coverage.

While on the basis of Fig. 3 (top view) you might think that all the space inside the adsorption tower 1 is overlapped with the supply pipes 4, this is not the case. In fact, this symmetrical configuration provides nearly 50% of the polling stations, free for the passage of gases. In addition, if required, it is possible to design the absorption tower 1 with two or three stages of the dispenser 2, preserving the ability to provide Myung who is using two or three steps. In this case, two or three separate stages of spray can be stacked on top of each other, overlaps, when viewed from above, not having the ability to turn at an angle required for construction. If possible, spray increase by manifold 5, which is located under the spray, you must have two collector 3, with one of them as a backup. The location of the collector 5, increases the capacity of the dispenser may be independent of the orientation of one or three separate steps atomizer 2.

In Fig. 7 and 8 shows the dispenser 2 different configurations, in contrast to the above. This dispenser 2 has only two collector 3, in contrast to the four previously described. The location of the supply pipes 4 also differs. These and many other options atomizer 2 is acceptable in accordance with this invention, Fig. 7 and 8 show, respectively, two possible variantov

1. The method of supplying liquid absorbent for sprinkling on sulfur-containing flue gas in the absorption tower for desulfurization of flue gases with inlet and outlet for the flue gases, which consists in the fact that the absorbent is fed into the tower through at least two Cooma manifold, each supply pipe is placed in the tower so that it alternately crosses the path of flow of the combustion gases in the same or nearly in the same plane inside the tower, spray liquid absorbent in the flue gas inside the tower through a series of nozzles attached to each of the feeding pipeline, characterized in that the collectors are placed on the outside of the tower.

2. The method according to p. 1, characterized in that place at least two collector on the same side of the tower.

3. The method according to p. 2, characterized in that both the collector on the same side move in a vertical direction relative to each other.

4. The method according to p. 1, characterized in that they have at least two collector on opposite sides of the tower.

5. The method according to p. 1, characterized in that the absorbent is fed through a four-manifold, every two of which are placed on opposite sides of the tower.

6. The method according to p. 5, characterized in that at least two collector located on opposite sides of the tower are coplanar.

7. The feeder liquid absorbent for spraying at least one layer of the dispersion on the exact gas will the ore two elongated manifold for flow of the liquid absorbent in the tower, many elongated feed lines attached to each of the collector and passing inside the tower, and the supply piping located so that alternately intersect the path of the combustion gases within the same plane inside the tower and a lot of nozzles attached to each of the supply piping, and nozzles have the same configuration, in order to spray the liquid absorber in the flue gas inside the tower, characterized in that each of the collectors is made adjacent to the tower from the outside.

8. The device according to p. 7, characterized in that it is provided with a node of the pump in each of the above-mentioned liquid collector absorber.

9. The device under item 8, characterized in that each header and its corresponding supply piping made decreasing in diameter throughout its length.

10. The device according to p. 9, characterized in that at least two collector are located on the same side of the tower.

11. The device according to p. 10, characterized in that the collectors on the same side of the tower is displaced in a vertical direction relative to each other.

12. The device according to p. 9, characterized in that the collectors raspolojeniea, every two of which are located on opposite sides of the tower.

14. The device according to p. 13, characterized in that at least two of the reservoirs located on opposite sides of the tower are coplanar.

15. The device according to p. 9, characterized in that it comprises means for distributing the gas flow to provide a uniform gas flow inside the tower.

16. The device according to p. 9, characterized in that a collector is back.

 

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FIELD: chemical engineering.

SUBSTANCE: apparatus comprises groups of parallel rectangular plates with corrugated bottom. The ribs of the corrugation are oriented along the flow, and the distance between the plates does not exceed 30 mm. Between the plates, rods or pipes are arranged at an angle 90±15° to the vector of flows. The plates are assembled in groups of parallel plates inclined downstream. The uniform distribution of fluid over the plates when fluid flows from one plate group to another group is provided by means of distributing-overflowing devices.

EFFECT: decreased hydraulic drag.

2 cl, 5 dwg

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