JPH07253280A - Exhaust gas-switching apparatus - Google Patents

Abstract

PURPOSE:To provide an exhaust gas-switching apparatus in which disposition, a structure and an operation of devices can be simplified and facilitated for an exhaust gas treating system including a dry duct collector, a turbine, etc. CONSTITUTION:An exhaust gas switching apparatus 1 treats to reuse exhaust gas generated from a generation source of a blast furnace A, etc., and switches its gas routes 1)-5). The apparatus comprises a plurality of external connection ports 10 to become exhaust gas entrance and exit, a plurality of exhaust gas inner passages 20 formed of a plurality of tubes 20a and partition walls 20b and connected to the ports 10, a plurality of valves 30 for so switching the openings of the tubes 20a or the walls 20b to switch the routes 1)-5) by selecting the passages 20, and a flushing dust removing unit 40 for removing dusts of the gas by sprinkling in either passage 20 to be selected by the valve 30.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the treatment of high-temperature, high-pressure exhaust gas generated from ironmaking equipment such as a blast furnace and other reaction equipment, including a dry dust collector and a power generation turbine for recovering gas energy. The present invention relates to an exhaust gas switching device that can selectively pass through an appropriate path in a system.

[0002]

2. Description of the Related Art Gas (exhaust gas) generated from a blast furnace is
In addition to dust and impurities, it also contains a large amount of combustible components such as CO (carbon monoxide), and since it has heat of 100 ° C or more and pressure of around 2.5 kg / cm ² G, iron mills are required to remove dust etc. It is common to recover the energy after reuse, or reuse it as fuel or the like.
An expansion turbine connected to a generator is often used for energy recovery. For reuse, the exhaust gas passing through such a turbine is reduced in pressure to almost atmospheric pressure and used as it is as fuel or the like, or is temporarily stored in a gas holder. On the other hand, dust removal of exhaust gas is often performed by a dry dust collector (bag filter). This is because a bag filter for high temperature gas, which has a smaller temperature drop and pressure loss than a so-called wet type (sprinkler type) dust remover such as a venturi scrubber, has been put into practical use.

However, when the exhaust gas from the blast furnace is passed through a bag filter or a turbine, a gas path for bypassing them is indispensable. This is because blast furnaces are continuously operated for many years, whereas turbines and bag filters require inspection and maintenance several times a year. In addition, the blast furnace is blown off several times a year for inspection and maintenance of the entire system, and the gas pressure and temperature may be lowered at the time of transition to rest or start of re-winding. However, the turbine does not function in such a case, and the bag filter may cause clogging of the filter cloth due to dew condensation. In addition, since the heat resistance of the filter cloth currently in practical use is about 200 ° C., even if the temperature of the exhaust gas rises abnormally, it is impossible to pass the gas through the bag filter.

FIG. 6 shows a conventional treatment system for blast furnace exhaust gas, which includes a high temperature bag filter and an energy recovery turbine. A bag filter (BDC) B, an expansion turbine (TRT) C, etc. are connected in series to the gas discharge part (furnace top part) of the blast furnace (BF) A, and a cleaning tower Q is used for washing and removing corrosive components such as chlorine. Connected to the gas holder D. Wet dust collectors (VS) R of the type in which water is sprayed to the venturi inside and septum valves (S
V) S etc. are connected. If gas cannot pass through the bag filter B as described above, the valves H
Close I to bypass gas to wet dust collector R. Further, when the gas cannot be passed through the turbine C, the front and rear valves J and K are similarly closed to bypass the septum valve S, and the gas pressure is lowered. When changing each ventilation amount to the turbine C and the septum valve S according to the gas pressure, the gas pressure of the blast furnace A is detected by the sensor F, and the opening degree of the turbine C or the septum valve S is detected by the signal. adjust. others,
On the upstream side of the bag filter B, an evaporative cooler P (which evaporates water in an unsaturated state to cool the gas) is provided along with the temperature sensor G, and cools the gas when the temperature is abnormally high. To protect the filter cloth.

A conventional treatment system for blast furnace exhaust gas is also described in JP-B-52-50002.

[0006]

In the conventional processing system as shown in FIG. 6, a wet dust collector, a septum valve, an evaporative cooler, a cleaning tower, etc. are separately arranged in addition to the main devices such as a bag filter and a turbine. Therefore, it is not optimal in terms of installation space, device configuration, and device operation. In other words, each separately arranged device requires its own space, so the overall occupied space of the system becomes considerably large, and the wet dust collector and the evaporative cooler / wash tower both use water. Although they are common to each other, they are independent devices, so that there is a waste of configuration.
In addition, as shown in the figure, many valves must be installed in different places, which is wasteful in terms of arrangement and configuration, and inefficiency in operation that each opening and closing operation cannot be performed at one place. Have also been invited. As the valve, a goggle valve that opens and closes the flow path by moving a spectacle-shaped valve body in parallel with the opening surface is often used,
With that type, the space occupied is particularly large, and the time required for opening and closing operations is long.

The present invention includes an effective bypass path for a main path (for example, a path including a dry dust collector and a turbine) having a part of a processing function for exhaust gas reuse, and exhaust gas is included in each path. The present invention provides an exhaust gas switching device that has a function of switching and passing through, and that is configured by consolidating most of the equipment / devices other than the main device (for example, a dry dust collector or turbine), and aims to eliminate the above-mentioned inconvenience. And

[0008]

The exhaust gas switching device according to claim 1 of the present invention is a process for reusing the exhaust gas generated from a blast furnace or the like (required among dust removal, decompression, cooling, etc.). An exhaust gas switching device that switches the gas path of the exhaust gas, and a) multiple external connection ports that serve as exhaust gas inlet / outlet ports, and b) multiple external connection ports that are formed by pipes or partition walls. An internal passage of exhaust gas to be connected, c) a plurality of valves for opening and closing the pipe or the opening of the partition wall so as to switch the gas passage by selecting the internal passage, and d) any of the valves selected above. It is configured to include a cleaning dust remover (the above-mentioned wet dust collector or the like) for removing gas dust by spraying water in the internal passage.

The exhaust gas switching device according to a second aspect of the present invention replaces the cleaning and dust remover of the d) of the first aspect of the present invention with e) the subsequent gas pressure in any of the internal passages selected by the valve. Depressurizing means for lowering (having the same function as the septum valve described above; the function of c) may also serve as the function).

[0010] As described in claim 3,
An exhaust gas switching device including all of a) to e) may be added by adding the cleaning / dust remover of d).

In the above apparatus, as described in claim 4, f) some components (chlorine, etc.) in the gas are removed in the internal passage leading to the external connection port closest to the reuse destination. It is more preferable to provide a cleaning device (having the same function as the above-mentioned cleaning tower).

According to claim 5, g) one of the external connection ports is connected to the upstream of the dry dust collector, and a gas temperature adjusting means (for example, the above-mentioned evaporative cooler is provided in an internal passage connected to the connection port). It is also possible to provide a cooling means such as or a temperature raising means such as a combustor, or both of them.

Alternatively, as described in claim 6, h) one of the external connection ports is connected upstream of the turbine (turbine for gas energy recovery), and the combustor (gas It is also possible to provide a means for heating a part of it by burning it.

It is preferable that the valve of the above item c) is of a type in which a valve body including a conical portion moves in a direction perpendicular to the opening (so-called poppet valve type).

[0015]

In the exhaust gas switching device of the present invention, each of the plurality of external connection ports shown in a) above is a source of exhaust gas and external devices for passing the gas (for example, a dry dust collector such as a bag filter, It is used as a part of the exhaust gas processing system in the state where it is connected to the energy recovery turbine or the final supply destination such as a gas holder. Each of these external connection ports is connected to any of the internal passages in b) above, but each internal passage is opened appropriately by opening or closing the opening of the pipe or partition wall by any of the valves in c) above. , Or closed. Therefore, switching between passing the exhaust gas through each of the external devices or passing through a route different from them can be performed by operating the valve of the c) in the present device. Most of the valves required between each external device for passing gas and this switching device can be integrated in this switching device as such valves, so that the valves are scattered at a number of points separated from each other. The above-mentioned inconvenience in arrangement and operation is eliminated.

Since the exhaust gas switching device according to the first aspect of the present invention has the cleaning dust remover in a part of the internal passage as in the above d), the exhaust gas processing system includes the dry dust collector. In this case, an effective bypass path for the dry dust collector is included. That is, when the dry dust collector is inspected and maintained, or when the temperature of the exhaust gas is inappropriate (for example, high temperature that damages the filter cloth or low temperature that causes dew condensation), the above-mentioned switching by the internal valve is used. The gas to the dust collector can be stopped and the gas can be passed through the internal passage having the cleaning / dust remover. The cleaning dust remover functions regardless of the temperature of the gas, and can perform dust removal by sprinkling, that is, processing for gas reuse stably at any time. It should be noted that the fact that the switching device includes the cleaning dust remover means that the cleaning dust remover is integrated in one device in addition to performing the dust removing operation in place of the dry dust collector, that is, the exhaust gas treatment system as a whole. This brings the advantage of easy placement, configuration, and operation.

Since the switching device of claim 2 has the pressure reducing means in a part of the internal passage as described in e), a device such as a turbine which is accompanied by a pressure drop in the exhaust gas processing system.
When a device (hereinafter referred to as a turbine or the like) is included, it has an effective bypass path for the turbine or the like. That is, at the time of inspection / maintenance of the turbine etc. or when the pressure of the exhaust gas is insufficient, the above-mentioned switching by the internal valve stops the gas to the turbine etc. and allows the gas to pass through the internal passage with this pressure reducing means. be able to. It is difficult to obtain positive benefits such as recovery of gas energy by simply reducing the pressure, but it is possible to lower the pressure and send gas smoothly to downstream equipment (gas holders, etc.) as when passing through a turbine, etc. . In the apparatus of claim 2 as well, there is a merit that the pressure reducing means is integrated in one apparatus together with many valves.

Since the switching device of claim 3 has the cleaning dust remover of d) and the depressurizing means of e) in the internal passage, a general type as shown in FIG. 6 having a dry dust collector, a turbine, etc. in the system. In the exhaust gas treatment system, a bypass path similar to that shown in FIG. That is, the exhaust gas can be passed through the cleaning and dust remover in the device when it cannot be passed through the dry dust collector, and can be passed through the decompression means in the device when it cannot be passed through the turbine or the like. When the gas cannot pass through either the dry dust collector or the turbine, gas may be passed through both the cleaning dust remover and the pressure reducing means in order. Compared to the example of FIG. 6, a large number of valves are integrated in this device as the valve of c), and the cleaning dust remover and the decompression means are also included in the device, so that the exhaust gas treatment system The advantages of placement, configuration and operation are great.

Since the switching device according to the fourth aspect has the cleaning device in the internal passage as in the above f), it is not necessary to separately provide a cleaning tower and the like unlike the system of FIG. Therefore, the degree of integration of the equipment and devices required as an exhaust gas treatment system is further increased, and the advantages such as ease of arrangement and use thereof are even greater. Especially, the cleaning dust remover of d) and this f)
Since the washer of both is a device that uses water, this switching device equipped with both can be used as a pipe and equipment for water supply and drainage, and a rational configuration with no waste is possible. . In addition, the cleaning device referred to here is for cleaning and removing components such as chlorine in exhaust gas that may corrode during condensation and affect the gas holder etc. with such a purpose and a decrease in gas temperature. In consideration of the above, it is placed in the inner passage closest to the reuse destination (gas holder, etc.).
However, if the device is equipped with the cleaning dust remover of d) and it is operated, the exhaust gas has already been subjected to the water washing action of the cleaning dust remover, so that the cleaning device of this f) should be operated. Does not reach.

Since the switching device according to claim 5 has the gas temperature adjusting means as in the above g) in the internal passage upstream of the dry dust collector, even when the gas generated from the blast furnace or the like is too hot or cold, Enables dust removal of the gas using a dry dust collector. That is, when the cooling means is provided as the temperature adjusting means, the gas temperature is lowered to such an extent that the filter cloth of the dry dust collector or the like is not hindered when the gas is at an abnormally high temperature. When the temperature is low, the gas is dried so that the filter cloth or the like will not be clogged due to dew condensation. When the dust can be removed by the dry dust collector in this way, the pressure and temperature drop during the dust removal is small as described above, so that the gas energy can be efficiently collected by the turbine or the like. Also, if a cooling medium of a type using water as a medium is used, pipes and the like can be shared when the above-mentioned d) cleaning / dust removing device and f) cleaning device are installed side by side.
It is convenient.

According to the sixth aspect of the present invention, since the combustor is provided in the internal passage upstream of the turbine as in the above item h), even if the thermodynamic energy of the exhaust gas is low, sufficient energy by the turbine can be obtained. Allows recovery. That is, when the temperature or pressure of the exhaust gas from the blast furnace or the like is not sufficient to drive the turbine, the gas is heated by the combustor to supplement the energy. CO in the gas
When a combustible component such as, for example, is included, the component is partially combusted only by having a minute ignition source as a combustor, so that the effect is remarkable. When gas is passed through the cleaning dust remover instead of the dry dust collector, the gas temperature tends to be low.Therefore, the cleaning dust remover in d) above and the combustor in h) above should be installed side by side in the switching device. Is especially effective. In that case, the heating by the combustor also has the effect of drying the moistened gas via the scrubber.

The switching device according to claim 7 has an advantage in terms of equipment arrangement and function based on the configuration of the valve included in the switching device.
That is, a so-called poppet type valve in which a conical valve element moves in a direction perpendicular to a pipe forming an internal passage or an opening of a partition wall requires a small space in a direction perpendicular to the moving direction of the valve element. Therefore, an efficient arrangement becomes possible by providing a plurality of them in parallel. Therefore, there is an advantage that the switching device can be configured as a multifunctional device including a large number of valves while keeping the whole compact. Further, the poppet valve type has an advantage that the response is quick and the flow rate control is easy because the flow rate (Cv value) relationship with the opening degree is close to linear in addition to having the function of completely shutting off gas. Moreover, by utilizing this control characteristic, the valve of this type can also serve as the pressure reducing means. The above advantages can hardly be expected when the above-mentioned goggle valve is used.

[0023]

1 and 2 show a first embodiment of the present invention. In this example, as in the case shown in FIG. 6, the high temperature and high pressure exhaust gas from the blast furnace A is dedusted by the dry dust collector B, passed through the expansion turbine C for power generation to recover the stored energy, and then sent to the gas holder D. The present invention relates to a gas processing system mainly for storing. Although the system has a gas bypass path to the dry dust collector B and the turbine C as in the case of FIG. 6, as shown in FIG. 1 (b), a unique switching device (KA
Due to the use of S) 1, the devices in the system and the connection system are significantly different from those in FIG. The configuration of the switching device 1 will be described below.

FIG. 1A is a conceptual diagram showing the structure of the exhaust gas switching device 1, which is a plan view of the device 1 which is actually cylindrical. As shown in the figure, this switching device 1 has a large number of devices and pipes housed in an integral casing 1a, and its general configuration is as follows. That is, a plurality of external connection ports 10 are provided outside the casing 1a.
(11 to 16) are provided, a plurality of internal passages 20 (21 to 26, etc.) connected to the connection port 10, and a plurality of valves 30 (31 to 3) that open and close the openings of the internal passages 20 are provided inside.
6), and a cleaning dust remover 40, a cleaning device 50, a temperature adjusting combustor 60, a heating combustor 70, etc., which will be described later. The internal passage 20 includes a plurality of tubes 20 including a vertically oriented portion.
a and a plurality of partition walls 20b close to the horizontal, the passage 2
0 is formed so as to be connected to any of the external connection ports 10 (in the figure, the passage portions corresponding to the pipe 20a are denoted by reference numerals 21 to 26, but the reference numerals of the portions corresponding to the partition wall 20b are omitted. Exist). The valve 30 has an internal passage 2
The opening 30a at the bottom of each tube 20a of No. 0 is opened and closed by a valve body 30b having a conical head including a completely shut-off state. The telescopic rod 30c is oriented vertically (right angle to the opening 30a) and Each of the hydraulic cylinders 30e arranged in parallel is used for driving the valve body 30b. In addition,
A seal sleeve capable of maintaining airtightness is provided on a portion of the partition wall 20b that penetrates the telescopic rod 30c. In addition, each partition wall 20b is provided with a drain valve 81 at the lowermost portion with a gentle inclination, and an impeller 82 for separating water droplets is provided at a part of the drain valve 81 which serves as a gas passage.

The cleaning dust remover 40 is a substitute (bypass) device for the dry type dust collector B by performing so-called wet dust collection, and is provided in the uppermost portion of the casing 1a, that is, in the internal passage directly connected to the external connection port 11. It is composed of a plurality of spray (sprinkling) nozzles, spray nozzles provided in the internal passages 23 and 24, and valves 33 and 34 arranged below the internal passages 23 and 24. Valve 33.3
Since an appropriate venturi is formed by adjusting the opening degree of 4, the cleaning / dust removing functions similar to those of a normal venturi scrubber (VS; symbol R in FIG. 6) are achieved by the above spray nozzles and their venturi parts. Can be demonstrated.

The washer 50 is the washing tower Q in the example of FIG.
The spray nozzle is provided inside the internal passages 22 and 26 which cannot receive water spray of the spray nozzle above the casing 1a. If water is sprayed from these spray nozzles and the openings of the valves 32 and 36 below the spray nozzles are made appropriate, the chlorine content and the like in the exhaust gas can be effectively saturated and washed. Then, if these internal passages 22 and 26 are communicated with the external connection port 16 leading to the gas holder D by opening and closing the valve 30, even if the cleaning dust remover 40 is not used, a gas containing no corrosive component is included in the gas holder. Can be sent to D.

The temperature adjusting combustor 60 partially burns the gas sent to the dry dust collector B when the gas is too low in temperature and there is a risk of dew condensation. Specifically, an external connection is provided. A small burner is arranged in the internal passage 21 connected to the mouth 12. The internal passage 21 is connected to the dry dust collector B through the external connection port 12 and can communicate with the internal passage 23 by operating the valve 30, but a spray as a cleaning dust remover 40 in the internal passage 23. The nozzle also functions as a cooling means. Therefore, in the series of passages leading from the internal passage 23 to the external passage 21 and the external connection port 12, the temperature adjusting means having both the cooling function and the temperature raising function of the gas reaching the dry dust collector B is provided.

The heating combustor 70 partially burns a part of combustible components in the gas when sufficient energy cannot be recovered in the turbine C such as when the temperature of the gas is lowered by using the cleaning dust remover 40. To heat the entire gas,
The burner provided in the internal passage 25 leading to the external connection port 14 connected upstream of the turbine C corresponds to that.

In addition, the valves 32 of the internal passages 22 and 24
34 is further provided with a function as a pressure reducing means. For this purpose, a servo valve (not shown) is added to the hydraulic system of the hydraulic cylinder 30e that operates each valve element 30b to control the openings of the valves 32 and 34. Valve 3
2.34 is used as a pressure reducing means when gas cannot be passed to the turbine C, and normally the gas pressure after that is reduced by about 2.5 kg / cm ² which corresponds to the pressure drop in the turbine C. Let

From the above, each of the internal passages 21 to 26 has the following functions.
That is, the internal passage 21 ... the exhaust gas temperature raising function by the temperature adjusting combustor 60, the internal passage 22 ... the gas cleaning function and the pressure reducing function by the washer 50 and the valve 32, the internal passage 23 ... the gas by the cleaning dust remover 40 Cleaning and dust removing function and cooling function, internal passage 24 ... Cleaning and dust removing function and depressurizing function by the cleaning dust remover 40 and the valve 34, internal passage 25 ... Heating function by the heating combustor 70, internal passage 26 ... Cleaning by the washer 50 The functions are and. Needless to say, with respect to the internal passage 20 in which the lower valve 30 is closed, each device provided inside is stopped and the above-mentioned functions are not exhibited.

The switching device 1 is connected to the blast furnace A, the dry dust collector B, etc. as shown in FIG. 1 (b), and forms a part of the exhaust gas treatment system. That is, the above-mentioned external connection ports 11, 12, 13, 14, 15, 16 of the switching device 1 are
Downstream of blast furnace A, upstream and downstream of dry dust collector B, turbine C
Was connected to the upstream and the downstream of the gas holder D and the upstream of the gas holder D via a gas pipeline. Further, in order to automatically switch the gas path according to the pressure / temperature of the gas from the blast furnace A, a pressure sensor F and a temperature sensor G are provided as control devices (not shown).
It is arranged together with. It should be noted that all valves required between the external devices (the dry dust collector B, the turbine C, etc.) and the switching device 1 are integrated in the switching device 1 as valves 30 (31 to 36). Only the valve E between B and turbine C was separately and separately arranged as shown. This is because even valves between external devices cannot be accommodated in the device 1.

FIGS. 2A to 2D show a usage state of the switching device 1 constructed and arranged as described above. Of each figure,
The upper part shows the gas path in the gas treatment system, and the lower part shows the state of the apparatus 1 at that time. It is assumed that the black-painted valve 30 is fully closed (completely closed), and the rest are fully open or open to the adjusted opening (similarly in other drawings).

By the way, the gas path can be selected depending on which of the internal passages 21 to 26 is used by opening and closing the valves 31 to 36, and also which of the above-mentioned functions is to be performed. be able to. In this embodiment, the following five routes (-
. The circled numbers used in FIGS. 1 and 2 correspond to this).

Route: A route for sending the exhaust gas entering the switching device 1 from the blast furnace A through the external connection port 11 to the dry dust collector B from the external connection port 12. In the switching device 1, FIG.
Alternatively, as shown in (c), the valves 33 and 31 are opened to open the internal passage 23.
・ Passing gas through 21, so that it can perform functions such as cooling or heating of the gas. Gas that enters from blast furnace A through external connection port 11
A route from the external connection port 14 to the turbine C. As shown in FIG. 2 (d), the valves 33 and 35 are opened and passed through the internal passages 23 and 25, so that gas cleaning and dust removal, heating, etc. can be performed. The gas that enters from the blast furnace A through the external connection port 11 ,
A route for sending from the external connection port 16 to the gas holder D. Figure 2 (a)
As described above, the valve 34 is opened to pass through the internal passage 24, so that the gas can be cleaned and dedusted and the pressure can be reduced. The gas that enters from the dry dust collector B through the external connection port 13 through the external connection port 16 The route to send to. As shown in FIG. 2 (c), the valve 32 is opened to pass through the internal passage 22, so that the gas can be decompressed and cleaned. The gas that enters from the turbine C via the external connection port 15 is connected to the external connection port 16 A route to send to the gas holder D. Figure 2
As shown in (b) or (d), the valve 36 is opened to pass through the internal passage 26, so that the gas can be cleaned.

In FIG. 2, (a) shows a case where neither the dry dust collector B nor the turbine C is used. By opening only the valve 34, the exhaust gas from the blast furnace A is sent to the gas holder D through the path. In the internal passage 24 through which the gas passes, the cleaning dust remover 40 functions and the valve 34 reduces the pressure. Therefore, this device 1 uses the dry dust collector B and the turbine C (in the case of FIG. The gas is converted into the same state as in () and sent to the gas holder D. That is, in the apparatus 1, the cleaning dust remover 40 removes the dust from the gas, and at the same time, the chlorine content is removed by washing with water, and the valve 34 adjusts the pressure to an appropriate level.

FIG. 2 (b) shows that the gas in the blast furnace A is a dry dust collector B.
And the turbine C are sequentially passed to reach the gas holder D, which shows the most normal operating state of the gas processing system. In this case, in the switching device 1, as shown in the figure, only the valves 31, 33, 36 are opened, the gas from the blast furnace A is sent to the dry dust collector B by the route, and the gas leaving the turbine C is sent to the gas holder D by the route. . If the gas from the blast furnace A has an unsuitable temperature for the dry dust collector B, water is sprayed from the spray nozzle in the passage in the inner passage 23 of the passage to cool the gas, or the combustor for temperature adjustment is provided in the inner passage 21. 60 is ignited to raise the temperature. The cleaning dust remover 40 is not used because the dust is removed by the dry dust collector B, but the cleaner 5 in the internal passage 26 in the passage is removed to remove chlorine and the like.
Make 0 work.

FIG. 2C shows the case where gas is not passed through the turbine C. The valves 31, 32, 33 in the switching device 1 are opened, and the remaining valve 30 and the valve E between the dry dust collector B and the turbine C are closed. As a result, the gas from the blast furnace A is sent to the dry dust collector B through the path, and the gas leaving the dry dust collector B is sent to the gas holder D through the path. Blast furnace A
If the gas from the temperature is not suitable for dry dust collector B,
Among the paths, the temperature of the gas is adjusted by using the spray nozzle in the internal passage 23 or the temperature adjusting combustor 60 in the internal passage 21. The cleaning dust remover 40 is not used because dust is removed by the dry dust collector B, but the cleaner 50 in the internal passage 22 included in the passage is used to remove chlorine and the like. Since proper decompression is performed by the valve 32 when passing through the internal passage 22, the gas can be sent to the gas holder D at the same pressure as when the turbine C is used.

FIG. 2D shows a case where gas is not passed through the dry dust collector B. The valves 33, 35, and 36 in the switching device 1 are opened, and the remaining valves 30 and the dry dust collector B / turbine C are opened.
The valve E in between closes. As a result, the gas from the blast furnace A is sent to the turbine C through the path, while the gas that has left the turbine C is sent to the gas holder D through the path. Since it does not pass through the dry dust collector B, the cleaning dust remover 40 is used in the path, and the heating combustor 70 in the internal passage 25 is ignited for the purpose of compensating for the decrease in gas temperature due to it.

As described above, according to this switching device 1, the equipment and connection system of the gas treatment system are extremely simple (therefore, the operation thereof is also easy) as shown in FIG. The gas can be handled and reused in the same manner as in the case of 6.

Next, FIG. 3 shows the configuration of the switching device 2 according to the second embodiment of the present invention (FIG. 3 (a)) and the usage state (same as above).
(b) etc.). This device 2 as shown in FIG.
Also, a plurality of external connection ports 10, a plurality of internal passages 20 (21 to 23, etc.) formed by pipes and partition walls, a plurality of valves 30 including a valve body having a conical tip and a hydraulic cylinder, and the like.
(31-33), a cleaning dust remover 40 having spray nozzles arranged in the upper space and the internal passage 22, and a cleaner 50 having spray nozzles respectively arranged in the internal passages 21 and 23. It was done. Then, as a part of the gas treatment system for the gas generating source A, it is used together with the dry dust collector B / turbine C and the gas holder D as shown in FIG.

However, in this example, as compared with the gas treatment system including the switching device 1 according to the first embodiment (see FIGS. 1 and 2), the temperature of the generated exhaust gas, the specifications of the dry dust collector B and the turbine C, etc. However, the number of the internal passages 20 and the like is reduced, and the configuration and function of the device 2 are simplified by omitting the temperature adjusting combustor 60 and the combustor 70. That is, the device 2 is provided with only three of the five kinds of routes that the device 1 (FIGS. 1 and 2) has,
From among them, the gas path can be selected by operating the valve 30 or the like. The routes are so coded that the functions that can be performed on the respective routes are the same as the routes of the same code in the device 1 (provided that the number of external connection ports 10 and internal passages 20 is small. Accordingly, the combination of the internal passages 20 and the like used as each path is different from that of the device 1).

The exhaust gas from the gas generating source A is appropriately switched by the switching device 2 and subjected to necessary processing and delivered to the gas holder D. Such an action is shown in FIG.
The following is an explanation according to (b), (c), and (d).

First, in FIG. 3 (b), the device 2 has a gas generating source A
It shows a state in which the gas entering from the inside is sent to the gas holder D along the open path of the valve 32. Other valves 30 in device 2
Since gas is closed, no gas flows to the dry dust collector B or the like. As shown in the figure, the passage opens the valve 32 to let the gas pass through the internal passage 22. Like the passage in the device 1, the gas is washed and dedusted (by the washing and dedusting device 40) and depressurized (the valve 32 is used).
You can do Such use is effective when the dry dust collector B or the turbine D and the dust collector B are under inspection or maintenance.

In FIG. 3 (c), the gas that has left the gas generation source A and passed through the dry dust collector B is shown in FIG.
Indicates the case of sending to. As shown in the drawing, the valve 31 is opened to allow the gas to pass through the internal passage 21, so that the gas can be decompressed (by the valve 31) and washed (by the washer 50). Since the other valve 30 and the valve E between the dry dust collector B and the turbine C are closed, the gas from the generation source A does not directly enter the apparatus 2 and follows the illustrated path. This is effective when the turbine C is inspected and maintained, or when the gas from the source A is not sufficiently high.

FIG. 3D shows a state in which the gas passing through the dry dust collector B and the turbine C is sent to the gas holder D along the path. As shown in the figure, the valve 33 is opened and is passed through the internal passage 23, so that gas cleaning (using the cleaning device 50) can be performed. Since the other valve 30 is still closed, the exhaust gas does not flow in any other route. In the gas treatment system of this embodiment, this is a normal usage mode, and since the temperature drop of the gas upstream of the turbine C is small, the efficiency of gas energy recovery by the turbine C is highest in this case.

Next, FIG. 4 shows a switching device 3 which is a third embodiment of the present invention. This device 3 as shown in FIG.
Also, a plurality of external connection ports 10 and internal passages 20 (21, 22
Etc.) / Valve 30 (31/32), etc., and a cleaning device 50 (spray nozzle) inside the internal passages 21/22.
4 is arranged and used by connecting to the gas generating source A, the dry dust collector B, the turbine C, and the gas holder D as shown in FIG.

However, also in this example, the switching device 3
According to the characteristics of the exhaust gas, the specifications of the dry dust collector B, etc., the configuration etc. is simplified, and the device 1 of the first embodiment (FIG. 1
It is assumed that only two of the five types of routes that Figure 2) had were provided. These routes also have the same reference numerals as those having the same functions as the respective routes in the device 1.

The switching device 3 switches the route of the exhaust gas from the gas generation source A as follows, performs necessary processing, and delivers the exhaust gas to the gas holder D. First, FIG. 4B shows a case in which no gas is sent to the turbine C. The device 3 in this case sends the gas, which has come out of the gas generation source A and passed through the dry dust collector B, to the gas holder D along the path. As shown in the figure, the valve 31 is opened and gas is passed through the internal passage 21. The gas is depressurized by the valve 31 and the cleaning by the cleaning device 50 is performed. On the other hand, FIG. 4 (c) shows a normal mode of use in the gas treatment system of this embodiment, in which the gas from the gas source A through the dry dust collector B and the turbine C is sent to the gas holder D along the path. . As shown in the drawing, the valve 32 is opened to allow the gas to pass through the internal passage 22, so that the cleaning device 50 can clean the gas.

FIG. 5 shows a switching device 4 as a fourth embodiment of the present invention. This device 4 also has a plurality of external connection ports 1
0, internal passage 20 (21 to 23, etc.), valve 30 (31 to 31)
32) and the like are combined, the cleaning dust remover 40 (spray nozzle) is arranged inside each of the internal passages 21 and 23 and the upper space, and the evaporative cooler 60 is provided in the internal passage 22. The internal passages 21 and 23 are provided with the same cleaning dust remover 40 and valves 31 and 32, and exhibit the same function in parallel. The apparatus 4 configured in this manner is also used by connecting it to the gas generation source A, the dry dust collector B, the turbine C, and the gas holder D as shown in FIG.

This switching device 4 also has a simplified structure and the like according to the properties of the exhaust gas and the specifications of the dry dust collector B, and has the five features that the device 1 (FIGS. 1 and 2) of the first embodiment has. Only two of the types of routes were equipped. Therefore, the device 4 appropriately switches the path of the exhaust gas from the gas generation source A as described below, performs the necessary processing, and delivers the exhaust gas to the gas holder D. First, FIG. 5B shows a case where no gas is sent to the dry dust collector B, but the gas emitted from the gas generating source A is sent by the device 4 to the turbine C along the path and directed to the gas holder D. At this time, as shown in the drawing, the valves 31 and 33 are opened and the gas is passed through the internal passages 21 and 23 in parallel, and the cleaning and dust removing device 40 (and the valves 31 and 33) cleans and removes the gas. On the other hand, the case of FIG. 4 (c) is a normal use mode in the gas treatment system of this embodiment, in which the gas from the gas source A is sent to the dry dust collector B and the valve E is used.
It is sent to the turbine C and the gas holder D through the open flow path (see FIG. 5B). Since the valve 32 is opened to allow the gas to pass through the internal passage 22, if the temperature of the gas is too high for the dry dust collector B, the evaporative cooler 60 can cool the gas (temperature adjustment).

Although some embodiments have been introduced above, the exhaust gas switching device of the present invention is not limited to this. According to the second to fourth embodiments, a combination of some required from the paths described in the first embodiment ((the reference signs of the internal passages used are different but functionally as described above), This is because the configuration can be freely changed. In addition, this equipment is suitable for handling the gas generated from steelmaking facilities such as blast furnaces, and also treats gas generated from other reaction equipment that also discharges high temperature and high pressure gas. Also in the system, the same action and effect as described above are brought about.

[0052]

According to the exhaust gas switching device according to the first aspect of the present invention, most of the valves required between each external device for passing gas and this switching device can be integrated in this device. Therefore, the space related to the arrangement of the valves can be efficiently used and its operation is facilitated. Also,
Since this switching device has the cleaning dust remover in a part of the internal passage, it constitutes an effective bypass path for the dry dust collector when the exhaust gas processing system includes the dry dust collector. That is, even when the dry dust collector is inspected and maintained, or when the temperature of the exhaust gas is inappropriate, the gas can be stably removed at any time by switching the gas to the path including the internal passage. In addition, since the cleaning and dust remover is also integrated in one device, there is an advantage that the arrangement, configuration and operation of the entire exhaust gas processing system can be made smooth.

The switching device according to the second aspect of the present invention has advantages in terms of arrangement and operation as the valves are integrated, and since the pressure reducing means is provided in a part of the internal passage, the switching device in the exhaust gas treatment system is If the turbine includes a turbine, it will have an effective bypass path. That is, even when the turbine or the like is inspected or maintained, by passing the gas through the internal passage, it is possible to reduce the pressure, which is preferable for the downstream equipment, as in the case of passing the gas through the turbine or the like. Since the pressure reducing means is integrated in one device together with many valves, there are also great merits regarding the arrangement, configuration, and operation of the entire exhaust gas treatment system as in the above.

Since the switching device of the third aspect has the cleaning dust remover and the pressure reducing means in the internal passage, it is a very preferable bypass route in a general exhaust gas treatment system including a dry dust collector, a turbine and the like in the system. Make up. Since a large number of valves, cleaning dust removers, and decompression means are integrated in this device, the advantages brought about with respect to the arrangement, configuration, and operation of the exhaust gas treatment system are extremely large.

Since the switching device of the fourth aspect has the cleaning device in the internal passage, it is not necessary to separately provide a cleaning tower or the like, and the degree of integration of the equipment and devices required as an exhaust gas processing system is further enhanced. The advantages such as the easy arrangement and use of the devices in the system are even greater. In particular, since both the cleaning dust remover and the cleaning device are devices that use water, by consolidating these in the present device, the processing system can have a rational configuration with no waste.

Since the switching device according to the fifth aspect has the gas temperature adjusting means in the internal passage upstream of the dry dust collector, the gas can be removed using the dry dust collector even when the gas temperature is too high or too low. And continue efficient energy recovery. In particular, when a cooling medium of a type using water as a medium is used, there is also an advantage that the arrangement and configuration of the piping and the like can be simplified when a cleaning dust remover and a cleaning device are provided side by side.

Since the switching device according to the sixth aspect has the combustor in the internal passage upstream of the turbine, it is possible to sufficiently recover energy by the turbine even when the thermodynamic energy of the exhaust gas is low. The effect is particularly remarkable when the gas contains a combustible component such as CO or when the gas is passed through a cleaning dust remover instead of the dry dust collector.

The switching device according to the seventh aspect can be configured as a multi-function device including a large number of valves while keeping the whole compact, based on the type of valve that the switching device has. Further, the valve having such a configuration has an advantage that it has a function of completely shutting off gas, has a quick response to an operation, can easily control a flow rate, and thus can also serve as a pressure reducing function.

[Brief description of drawings]

FIG. 1 (a) is a conceptual diagram showing a configuration of an exhaust gas switching device 1 according to a first embodiment of the present invention, and FIG. 1 (b) is an entire exhaust gas treatment system including the switching device 1. It is a system diagram.

2 (a) to 2 (d) are views showing a usage state of the exhaust gas switching device 1. FIG. In each figure, the upper part shows the gas path in the exhaust gas processing system, and the lower part shows the state of the valves in the switching device 1 when the gas is sent through the path.

FIG. 3 is a conceptual configuration diagram (FIG. 3 (a)) showing an exhaust gas switching device 2 according to a second embodiment of the present invention, and an explanatory view of the usage state of the switching device 2 (FIG. 3 (b)). (d)).

FIG. 4 is a conceptual configuration diagram showing an exhaust gas switching device 3 which is a third embodiment of the present invention (FIG. 4 (a)), and a usage state explanatory diagram of the switching device 3 (same as in FIG. 4 (b). c)).

FIG. 5 is a conceptual configuration diagram (FIG. 5 (a)) showing an exhaust gas switching device 4 according to a fourth embodiment of the present invention, and an explanatory view of a usage state of the switching device 4 (same as in FIG. 5 (b). c)).

FIG. 6 is an overall system diagram showing a conventional general processing system for exhaust gas.

[Explanation of symbols]

 1, 2, 3, 4 switching device 10 (11, 12 ...) External connection port 20 (21, 22 ...) Internal passage 30 (31.32 ...) Valve 40 Cleaning dust remover 50 Cleaning device 60 For temperature adjustment Combustor (temperature adjusting means) 70 (for heating) Combustor A Blast furnace, gas generation source B Dry dust collector C Turbine D Gas holder ... Gas path

Claims (7)

[Claims] 1. An exhaust gas switching device for treating exhaust gas for reuse and switching the path of the gas, wherein a plurality of external connection ports serving as exhaust gas inlets / outlets, a plurality of pipes or partition walls are provided. An internal passage for exhaust gas that is formed and connected to each external connection port, a plurality of valves that open and close the opening of the pipe or partition wall to switch the gas passage by selecting the internal passage, and select with the above valve An exhaust gas switching device having a cleaning dust remover for removing gas dust by sprinkling water in any of the internal passages. 2. An exhaust gas switching device for treating exhaust gas for reuse and switching the path of the exhaust gas, wherein a plurality of external connection ports serving as exhaust gas inlets / outlets, a plurality of pipes or partition walls are provided. An internal passage for exhaust gas that is formed and connected to each external connection port, a plurality of valves that open and close the opening of the pipe or partition wall to switch the gas passage by selecting the internal passage, and select with the above valve An exhaust gas switching device, characterized in that it has a pressure reducing means for reducing the gas pressure thereafter in any of the internal passages. 3. The exhaust gas switching device according to claim 2, further comprising a cleaning dust remover for removing gas dust by spraying water in any internal passage selected by the valve. 4. The exhaust gas switching device according to claim 1, further comprising a scrubber for removing a part of components in the gas in an internal passage connected to the external connection port closest to the reuse destination. 5. The exhaust gas according to claim 1, wherein one of the external connection ports is connected to the upstream side of the dry dust collector, and gas temperature adjusting means is provided in an internal passage leading to the connection port. Switching device. 6. The exhaust gas switching device according to claim 1, wherein one of the external connection ports is connected to an upstream side of the turbine, and a combustor is provided in an internal passage leading to the connection port. 7. The exhaust gas switching device according to claim 1, wherein the valve is of a type in which a valve body including a conical portion moves in a direction perpendicular to the opening.