JPWO2006070442A1 - Gas calorie fluctuation suppression device, fuel gas supply equipment, gas turbine equipment and boiler equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas calorie fluctuation suppressing device capable of supplying low calorie gas as a stable fuel while suppressing fluctuation of the calorie. A calorie fluctuation suppressing device is provided in a low calorie gas supply pipe 3 for supplying low calorie gas as a fuel gas to a gas turbine 2, and a buffer tank 10 for temporarily storing the low calorie gas, An inlet 10a formed in the tank 10 that communicates with the upstream side of the low calorie gas supply pipe 3, an outlet 10b that communicates with the downstream side of the low calorie gas supply pipe 3, and a low calorie gas supply pipe 3 that communicates with the inlet 10a. And an inclined tube member formed continuously, and the inclined tube member is inclined upward from the horizontal.

Description

  The present invention relates to a gas calorie fluctuation suppressing device, a fuel gas supply facility, a gas turbine facility, and a boiler facility. More specifically, when the calorific value of the gas used as the fuel for the combustion equipment fluctuates like low calorie gas, the gas calorie fluctuation suppressing device capable of suppressing the calorific value fluctuation, and the fuel gas provided with the gas calorie fluctuation suppressing device The present invention relates to a supply facility and a gas turbine facility and a boiler facility as a combustion facility equipped with a fuel gas supply facility.

In the steelmaking field, for example, when pig iron is produced by the blast furnace method, a furnace top gas (Blast Furnace Gas, hereinafter referred to as BFG) is generated as a by-product gas from the blast furnace. Since the total calorific value of BFG reaches about half of the calorific value of the coke used, BFG is widely used in steelworks to reduce the cost of ironmaking. BFG is generated at 3000 Nm ³ per ton of input coke, and its composition is 10 to 18% CO ₂ , 22 to 30% CO, 52 to 60% N ₂ , 0.5 to 4% H ₂ , CH ₄ Is 0.5 to 3%.

Because BFG contains 2 to 10 g / Nm ³ of flue dusts in addition to this, after removal of up to about 0.01 g / Nm ³ in the dust collector so as calorific value 800 kcal / Nm ³ about the fuel gas, a hot air furnace, Used in coke ovens, heating furnaces, boilers, etc. In recent years, gas turbines can also be burned with low calorie gas due to improvements in technology, and the number of cases where power is generated using BFG as a gas turbine fuel is increasing. Low calorie gas is known to mean a gas having a calorific value of about 12 MJ / Nm ³ or less. As will be described later, the low calorie gas is not limited to the blast furnace gas (BFG) but includes many types of gases such as coke oven gas (COG) and converter gas (LDG).

  On the other hand, in recent years, new iron-making processes other than the blast furnace method (for example, direct reduction iron methods such as FINEX and COREX) are being developed, and combustion methods that can be applied to the effective use of by-product gases generated from such new processes. Is waiting for development. In any steelmaking process, the characteristics (gas composition and calorie) of the by-product gas generated vary depending on the equipment and operation contents. Even in the same equipment, it changes from time to time according to the characteristics of each raw material and the reaction process. There is no constant.

  Looking at calorie, which is the most important characteristic when using byproduct gas as gas turbine fuel, the upper limit of the allowable fluctuation range of calorie inherent to each gas turbine (for example, about + 10% of the average calorie value) When it exceeds, that is, when the calorie increases rapidly, the combustion temperature in the combustor of the gas turbine may suddenly become an abnormally high temperature. As a result, the burner part, the stationary blades and the moving blades of the turbine are damaged and the life is shortened, and the economical continuous operation of the gas turbine equipment becomes difficult.

A technique of diluting with nitrogen gas (N ₂ ) in order to suppress the calorie increase of by-product gas is known (see, for example, Patent Document 1 and Patent Document 2). However, when the by-product gas calorie value fluctuates, simply diluting the by-product gas with N ₂ is sufficient to suppress this fluctuation within the allowable calorie fluctuation range and allowable calorie fluctuation speed inherent to the gas turbine. There are cases where it is not possible. This is because when the by-product gas calorie fluctuation is abrupt, the response of the calorie detector may be delayed and timely dilution may not be possible, and a large amount of expensive inert gas must be consumed. This is because it is difficult to ensure this.

Therefore, it is possible to effectively cope with BFG in which the characteristic fluctuation of the byproduct gas is not so severe only by dilution with N ₂ . However, in the direct reduced iron method or the like, since the start and stop are repeated in a small-capacity reactor, the amount of gas generated and the caloric value fluctuate greatly, so that it is difficult to deal with only dilution with N ₂ .
JP 2002-155762 A JP 9-317499 A

  The present invention has been made to solve such a problem, and it is possible to easily dilute the fuel gas with the inert gas by suppressing the calorie fluctuation of the fuel gas such as low calorie gas supplied as fuel to the combustion facility. And a gas calorie fluctuation suppressing device that can be made effective and can eliminate the need for dilution with an inert gas, a fuel gas supply facility including the gas calorie fluctuation suppressing device, and a fuel gas supply facility. The object is to provide gas turbine equipment and boiler equipment.

For the above purpose, the gas calorie fluctuation suppressing device of the present invention is
A tank for temporarily storing fuel gas disposed in a fuel gas supply passage for supplying fuel gas as fuel gas to a combustion facility;
A gas inlet formed in the tank for the fuel gas to flow into the tank from the fuel gas supply passage;
The tank has a gas outlet that is formed separately from the gas inlet and through which the fuel gas flows from the tank to the fuel gas supply passage.

  Fuel gas, which is supplied every moment through the fuel gas supply passage, is temporarily stored in the tank, and is mixed with time difference therein. Therefore, even when the calorific value of this fuel gas is fluctuating, the time difference mixing reduces the width of the caloric fluctuation, and the calorie fluctuation speed is reduced. . As a result, it becomes easy and effective to adjust the calorie fluctuation of the fuel gas within the allowable fluctuation range of the gas characteristics of the combustion facility by the dilution gas. Further, depending on the average caloric value of the fuel gas, it is possible to make a state where dilution is not required. Note that the time difference mixing means that the gas flowing into the tank continuously with a time delay is mixed with the gas that has already flowed and stayed.

  The connection to the gas inlet is not limited to the upstream side of the fuel gas supply passage, and the connection to the gas outlet is not limited to the downstream side of the fuel gas supply passage. For example, as shown in FIG. 26, when a bypass passage is provided in the fuel gas supply passage and a tank is installed in the bypass passage, the downstream side of the bypass passage is connected to the gas inlet of the tank, and the upstream side is connected to the gas outlet. Thus, it is possible to employ a configuration in which means for pumping fuel gas to the tank is provided in the downstream bypass passage.

  The structure of the tank is not limited. For example, it may be a fixed-shaped tank whose volume does not change, or an internal volume fluctuation type tank used as a device (gas holder) for monitoring the gas supply-demand balance in a conventional gas turbine facility or the like. The internal volume variation type tank is a tank having an airtightly attached lid member that can move up and down according to the tank internal pressure, and a tank that can maximize the balance effect by positively moving the lid member up and down by a driving device. A tank or the like whose volume can be selected. It can be set as the apparatus which can exhibit the effect which diverts calorie fluctuation of fuel gas by diverting these tanks.

  The gas inlet is preferably configured to flow the fuel gas into the tank in a direction inclined upward or downward from the horizontal. This is because time difference mixing is effectively performed.

  In order to incline the gas inflow direction as described above, it includes an inclined pipe member formed continuously in the fuel gas supply passage communicated with the gas inlet, and the inclined pipe member is inclined upward or downward from the horizontal. It can be set as a structure.

  Or including a fixed louver disposed in one of the fuel gas supply passage and the tank in the vicinity of the gas inlet, and the fixed louver is composed of at least one louver having a fixed inclination angle. In addition, the gas inflow direction can be inclined.

  As a method of installing the fixed louver in the fuel gas supply passage or in the tank in the vicinity of the gas inlet, for example, a housing may be provided as a part of the fuel gas supply passage connected to the gas inlet, and attached to the housing. Good. Further, for example, it may be attached inside the tank close to the gas inlet.

  A gas calorie fluctuation suppressing device including a gas inflow device installed at the gas inlet and configured so that the inflow angle of the fuel gas into the tank can be changed is preferable.

The gas inflow device includes a variable louver disposed in one of the fuel gas supply passage and the tank in the vicinity of the gas inlet,
This variable louver can be composed of at least one louver that is swingably mounted so that its inclination angle can be changed from the outside.

  As a method of installing the variable louver in the fuel gas supply passage or in the tank near the gas inlet, for example, the same method as the above-described method of installing the fixed louver can be applied.

  A gas calorie fluctuation suppressing device configured such that a plurality of the gas inlets are formed and a gas inlet through which the fuel gas flows into the tank can be selected and switched among the gas inlets is preferable. This is because, for example, the time difference mixing of the gas in the tank can be promoted by periodically switching the gas inlet through which the gas flows.

  For such a gas calorie fluctuation suppressing device, a plurality of gas outlets can be formed, and a gas outlet through which fuel gas flows out of the tank can be selected and switched in synchronization with the switching of the gas inlet.

  Such a gas calorie fluctuation suppressing device can be configured such that the inflow directions of the fuel gas into the tanks of the plurality of gas inlets are different from each other.

  A plurality of the gas inlets are formed, including a flow rate adjusting device installed in a fuel gas supply passage communicating with each gas inlet, so that the flow rate of the gas flowing through each fuel gas supply passage can be changed. A gas calorie fluctuation suppressing device configured as described above is preferable. For example, gas mixing in the tank can be facilitated by periodically switching the gas flow rate through each gas inlet. Note that a flow rate adjusting valve may be employed as the flow rate adjusting device.

  A gas calorie fluctuation suppressing device including an inert gas supply passage connected to the tank for flowing an inert gas into the tank is preferable. This is because the fuel gas and the inert gas are mixed in the tank with a time difference.

  An inert gas supply passage connected so as to be inserted into the fuel gas supply passage communicated with the gas inlet, and an outlet end of the inert gas supply passage is located upstream of the gas inlet. A gas calorie fluctuation suppressing apparatus is preferable. This is because the mixing of the fuel gas and the inert gas is promoted.

  A gas calorie fluctuation suppressing device in which the inert gas is a waste nitrogen recovered from at least one of an oxygen production plant and a nitrogen production plant is preferable. This is because it is easy and inexpensive to procure inert gas. In addition, what is installed in processes, such as a blast furnace method and a direct reduction iron method, can be applied as an oxygen production plant or a nitrogen production plant, for example.

  A plurality of first gas calorific value measuring devices installed in the tank apart from each other, and configured so that the calorific value distribution of the gas in the tank can be measured by the first gas calorific value measuring device; Can do.

  Such a gas calorie fluctuation suppressing device detects a gas calorie value distribution in the tank based on a measurement value of the first gas calorific value measuring device, and determines a gas inflow direction into the tank according to the gas calorie value distribution. It preferably includes a control device that controls to vary. This is because good gas mixing in the tank can be realized.

  An inlet gas calorific value measuring device for measuring the gas calorie value on the inlet side installed in the fuel gas supply passage communicated with the gas inlet, and an outlet installed in the fuel gas supply passage communicated with the gas outlet A gas calorie fluctuation suppressing device including an outlet gas calorific value measuring device for measuring the side gas calorie value is preferable.

  Such a gas calorie fluctuation suppressing device compares the calorie fluctuation of the gas flowing into the tank with the calorie fluctuation of the exhaust gas from the tank based on the measured values of the inlet gas calorific value measuring device and the outlet gas calorific value measuring device. And a control device that controls to change the gas inflow direction into the tank based on the comparison result.

  When the ceiling of the tank is configured to move up and down, a control device that controls to change the gas inflow direction into the tank based on the direction and distance of the vertical movement of the ceiling is provided. preferable. This is because the gas inflow direction can be selected in accordance with the height of the ceiling to obtain the optimum gas mixture. As described above, the tank whose ceiling moves up and down is a tank having a lid member (which constitutes the ceiling) that can be moved up and down according to the tank internal pressure, and the lid member by the driving device. A tank that can select a tank volume that can maximize the balance effect by positively moving up and down.

  The gas outlet is preferably formed at a position deviating from an extension line of the central axis of the gas inlet. This is because the residence time of the fuel gas flowing into the tank can be extended. The extension line of the central axis of the gas inlet means, for example, the extension line of the central axis of the inclined pipe member described above.

  It is preferable to install a stirring device for stirring the gas inside the tank.

The fuel gas supply facility of the present invention comprises:
A fuel gas supply passage for supplying fuel gas as fuel gas to the combustion facility;
A gas calorie suppression device for suppressing fluctuations in the calorific value of the fuel gas supplied through the low calorie supply passage,
This gas calorie suppressing device is constituted by any one of the gas calorie fluctuation suppressing devices described above.

In the gas calorie suppression device,
An outlet passage connected between the gas outlet of the tank and the fuel gas supply passage;
An inlet passage connected between one of the upstream side and the downstream side from the connection point of the outlet passage in the gas inlet of the tank and the fuel gas supply passage;
It is preferable to further include a gas pumping device disposed in the inlet passage and pumping the fuel gas toward the tank.

Alternatively, in the gas calorie suppression device,
An outlet passage connected between the gas outlet of the tank and the fuel gas supply passage;
An inlet passage connected between both the upstream side and the downstream side of the connection point of the outlet passage in the gas inlet of the tank and the fuel gas supply passage;
Preferably, it further includes a gas pumping device installed in each inlet passage for pumping the fuel gas toward the tank.

Alternatively, in the gas calorie suppression device,
An outlet passage connected between the gas outlet of the tank and the fuel gas supply passage;
An inlet passage connected between the gas inlet of the tank and the upstream side of the connection point of the outlet passage in the fuel gas supply passage;
A return passage connected between the downstream side and the upstream side of the connection point of the outlet passage in the fuel gas supply passage;
It is preferable to further include a gas pressure feeding device that is installed in each of the inlet passage and the return passage and pumps the fuel gas toward the tank and the upstream fuel gas supply passage.

Alternatively, in the gas calorie suppression device,
A fuel gas supply passage on the downstream side is connected to the gas outlet of the tank,
An upstream fuel gas supply passage is connected to one gas inlet of the tank,
A return passage connected between the other gas inlet of the tank and the downstream fuel gas supply passage;
It is preferable to further include a gas pumping device installed in the return passage for pumping the fuel gas toward the tank.

Alternatively, in the gas calorie suppression device,
A fuel gas supply passage on the downstream side is connected to the gas outlet of the tank,
An upstream fuel gas supply passage is connected to one gas inlet of the tank,
A return passage connected between the fuel gas supply passage upstream of the tank and the fuel gas supply passage downstream of the tank;
It is preferable to further include a gas pumping device that is installed in the return passage and pumps the fuel gas from the downstream side to the upstream side of the fuel gas supply passage.

The gas turbine equipment of the present invention is
The above combustion equipment;
A fuel gas supply facility for supplying fuel gas as fuel gas to the combustion facility,
The combustion facility is a gas turbine,
The fuel gas supply facility is composed of any one of the fuel gas supply facilities described above.

The above combustion equipment;
A fuel gas supply facility for supplying fuel gas as fuel gas to the combustion facility,
The combustion facility is a boiler that burns gas with a burner,
The fuel gas supply facility is composed of any one of the fuel gas supply facilities described above.

  According to the present invention, when low calorie gas that can change calorie, such as process by-product gas, is supplied as fuel gas to combustion equipment such as a gas turbine, the calorie fluctuation of the supplied low calorie gas is suppressed by mixing the time difference. (Relaxing). In other words, not only can the amplitude of fluctuations be reduced, but it is also possible to eliminate short-cycle and medium-cycle fluctuations and leave only long-period fluctuations as if they were a low-pass filter. And easy to do. Further, there is a case where dilution with a dilution gas is unnecessary.

It is a piping diagram showing the outline of the gas turbine power generation equipment including the low calorie gas supply equipment which is one embodiment of the fuel gas supply equipment of the present invention. It is the graph which showed an example of the state by which the calorie fluctuation | variation of low calorie gas is eased by passing the buffer tank in FIG. It is the graph which showed the other example of the state by which the calorie fluctuation | variation of low calorie gas is eased by passing through a buffer tank. It is the graph which showed the further another example of the state by which the calorie fluctuation | variation of a low calorie gas is eased by passing through a buffer tank. It is a piping diagram which shows the other example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a perspective view which shows an example of the gas inflow apparatus currently used for the buffer tank of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a partial cross section front view which shows the further another example of the buffer tank which can be installed in the gas turbine power generation equipment of FIG. It is a graph which shows an example of the result of the simulation of the time difference mixing of the gas in a buffer tank. It is a graph which shows the other example of the result of the simulation of the time difference mixing of the gas in a buffer tank. FIG. 6 is a piping diagram showing still another example of a buffer tank that can be installed in the gas turbine power generation facility of FIG. 1. FIG. 6 is a piping diagram showing still another example of a buffer tank that can be installed in the gas turbine power generation facility of FIG. 1. It is the graph which showed an example of the state by which the calorie fluctuation | variation of low calorie gas is eased by passing the buffer tank of FIG. 22 or FIG. FIG. 6 is a piping diagram showing still another example of a buffer tank that can be installed in the gas turbine power generation facility of FIG. 1. FIG. 6 is a piping diagram showing still another example of a buffer tank that can be installed in the gas turbine power generation facility of FIG. 1. FIG. 6 is a piping diagram showing still another example of a buffer tank that can be installed in the gas turbine power generation facility of FIG. 1. It is a piping diagram which shows the outline of the boiler equipment containing the low calorie gas supply equipment which is other embodiment of this invention.

Explanation of symbols

1 .... Low calorie gas supply equipment
2 ... Gas turbine
3. Low-calorie gas supply piping
4. Dilution gas supply piping
5 .... Control device
6. Mixer
7 ... Dust collector
8 ... Inlet calorimeter
9 ... Exit calorimeter
10 ... Buffer tank
11 .... Flow meter
12 .... calorimeter
13. Mixed gas supply piping
14 .... Flow meter
15. Calorimeter
16 .... Fuel gas compressor
17 ... Fuel piping
18 .... Flow meter
19 .. Combustor
20 ... Flow control valve
21... Filter
22 .... Generator
23 ... Buffer tank
24... Lid member
25... Drive device
26 ··· Cable
27... Pulley
28 .... Agitator
29 .... Flow meter
31 ... Buffer tank
32 ... Gas amount balance monitoring device
33a ··· Lid member (upper tank)
33b ... Lower tank
34 ... Weight
35.. Inclined pipe member
36... Gas inflow device
37... Housing
38 ... Variable louver
39 ··· Rotating shaft
40 ··· Connection member
41... Stop valve
42... Inert gas supply piping
43 ... Communication pipe (exit pipe)
44 ・ ・ ・ ・ Inlet piping
45 ... Fan
46 ... Gas amount balance monitoring device
47 ... ・ Tank
48 .... Pressure detection device
49 ... Return piping
51 .... Low calorie gas supply equipment
52 ... Boiler
53 .... Low calorie gas supply piping
54 ... Flow meter
S ... Direct reduction iron equipment

  DESCRIPTION OF EMBODIMENTS Embodiments of a gas calorie fluctuation suppressing device, a fuel gas supply facility, and a gas turbine facility according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a low-calorie gas supply facility 1 as an embodiment of the fuel gas supply facility of the present invention for supplying low-calorie gas as a fuel gas to a gas turbine as a combustion facility, and a gas turbine facility including the low-calorie gas supply facility 1 It is a piping diagram showing the outline. A gas turbine power generation facility is exemplified as the gas turbine facility. As described above, the low calorie gas is a gas having a calorific value of about 12 MJ / Nm ³ or less, and its calorie characteristics vary in many cases.

The low-calorie gas supply facility 1 as the fuel gas supply facility is a low-calorie gas as a fuel gas supply passage for supplying by-product gas (hereinafter referred to as low-calorie gas) generated directly in the reduced iron facility S to the gas turbine 2 as fuel. A supply pipe 3 and a dilution gas supply pipe 4 for supplying a dilution gas to the low calorie gas supply pipe 3 in order to dilute the low calorie gas are provided. The reason why the dilution gas is supplied to the low calorie gas is to prevent the calorie value of the low calorie gas from fluctuating and exceeding the allowable calorie range inherent to the gas turbine. The dilution gas supply pipe 4 is provided with a flow rate adjustment valve (hereinafter referred to as a flow adjustment valve) 14 and a flow meter 18 for adjusting the flow rate of the dilution gas, and is connected to the low calorie gas supply facility 1 by the mixer 6. ing. As the dilution gas, an inert gas, air, steam, exhaust gas discharged from a combustion facility, or the like can be employed. Nitrogen gas (N ₂ ) can be suitably employed as the inert gas, but of course, the inert gas is not limited to N ₂ and may be CO ₂ or He. Since the portion of the low calorie gas supply pipe 3 downstream from the mixer 6 is sometimes sent to the gas turbine 2 in a state where the low calorie gas is mixed with the diluent gas, the pipe in this range is referred to as a mixed gas supply pipe 13. . The low calorie gas supply facility 1 is provided with a control device 5 for controlling the operation thereof.

  In the upstream portion of the mixer 6 of the low calorie gas supply pipe 3, a dust collector 7 for removing dust from the low calorie gas directly sent from the reduced iron facility S, and a buffer tank (primarily storing the low calorie gas) (Hereinafter also simply referred to as a tank) 10 is installed. The buffer tank 10 is formed with an inlet 10a to which the upstream low calorie gas supply pipe 3 is connected and an outlet 10b to which the downstream low calorie gas supply pipe 3 is connected separately from the inlet 10a. The buffer tank 10 and a buffer tank 31 (see FIG. 6 and the like) described later include an inclined pipe member 35 (see FIG. 6 and the like), a gas inflow device 36, and an inert gas supply pipe 42 as an inert gas supply passage. Functions selectively as a gas calorie fluctuation suppressing device.

  The buffer tank 10 has a relatively large capacity, and the low calorie gas flowing in while calorimetrically changing is mixed with time in the buffer tank 10. That is, the low calorie gas that has flowed into the buffer tank 10 at the same time is distributed from a portion that flows out of the outlet 10b relatively early to a portion that stays in the buffer tank 10 from late. On the other hand, since new gas continuously flows in from the inlet 10a, the gas that has flowed in the past and the gas that has flown in the past are constantly mixed. Here, this is called time difference mixing.

  On the upstream side and downstream side of the buffer tank 10, calorific value detection devices 8 and 9 for detecting the calorific value of the low calorie gas are installed, and on the downstream side of the buffer tank 10, a flow meter for measuring the flow rate. 11 is installed. In FIG. 1, the flow meter 11 is installed in a portion between the buffer tank 10 and the mixer 6 in the low calorie gas supply pipe 3, but is not limited to this position. For example, you may install in the mixed gas supply piping 13 downstream from the mixer 6, and you may install in the fuel piping 17 connected to the combustor 19 of the gas turbine 2 mentioned later. In addition to the calorific value detection devices 8 and 9 on the low calorie gas supply pipe 3, another plurality of calorific value detection devices 12 are directly attached to the buffer tank 10. These actions will be described later.

  Here, as the calorific value detection devices 8, 9, and 12, so-called calorimeters that directly measure the calorific value of gas, devices that measure the content (concentration) of combustible components, and the like are used. When importance is attached to the detection speed, it is preferable to use a combustible gas concentration detector at present. Furthermore, depending on the type of combustible component contained in the low calorie gas applied, and depending on the combustible component in which the main concentration fluctuation occurs (for example, carbon monoxide in the by-product gas in the direct reduced iron method), the component You may use the density | concentration detector which detects this density | concentration. In this specification, these calorific value detection devices as a whole are referred to as “calorimeters”.

  A calorimeter 15 is installed in the mixed gas supply pipe 13. This is because the calorimeter 9 and the flow meter 11 on the outlet side of the tank 10 are monitored and the calorimeter 15 of the mixed gas supply pipe 13 is monitored to determine the appropriateness of the final caloric value of the mixed gas. . Further, when using oxygen-containing gas such as air or exhaust gas from combustion equipment as the dilution gas, an oxygen concentration meter (not shown) is provided in the mixed gas supply pipe 13 in order to control the oxygen concentration of the mixed gas. Install.

  A fuel gas compressor 16 of the gas turbine 2 is installed downstream of the calorimeter 15. A flow rate adjusting valve 20 for adjusting the turbine output is installed in the fuel pipe 17 connected from the fuel gas compressor 16 to the combustor 19 of the gas turbine 2. Reference numeral 21 denotes a filter installed in a pipe for supplying air to the combustor 19. A generator 22 is connected to the gas turbine 2. Although not shown, the gas turbine 2 may be provided with an exhaust heat recovery boiler power generation facility that generates power using the exhaust gas.

Next, the function and effect of the buffer tank 10 in FIG. 1 will be described. As described above, the buffer tank 10 has the inlets 10a and 10b to which the low calorie gas supply pipe 3 is connected. Therefore, all of the low caloric gas that has been sent flows into the buffer tank 10. The buffer tank has a large volume. For example, a low-calorie gas supply pipe 3 having a diameter of about 2 to 3 m and a normal volume of about 20000 to 200000 m ³ are installed. The low calorie gas sent while the calorie fluctuates from time to time is mixed in a time difference in the buffer tank. As a result, the fluctuation range of the calorie of the low calorific gas exiting from the outlet 10b of the buffer tank 10 is reduced at a stroke, and the fluctuation speed is reduced at a stroke. That is, calorie fluctuation is greatly suppressed (relieved). Thus, if the calorie fluctuation | variation is eased in advance, the suppression control of the calorie rise by dilution of air etc. will become very easy downstream. The above phenomenon will be described with reference to FIGS.

FIG. 2 shows a simulation result of the suppression (relaxation) state of calorie fluctuation when low calorie gas that fluctuates in calorie is supplied at a flow rate of 500,000 Nm ³ / hr when the volume of the buffer tank 10 in FIG. 1 is 200000 m ^3. It is shown. The horizontal axis represents time (minutes), and the vertical axis represents the gas calorie value (kcal / Nm ³ ), which is the calorific value of low calorie gas. Moreover, the curve shown with a broken line in the figure has shown the calorie fluctuation | variation (original fluctuation | variation) of the low calorie gas sent to the buffer tank 10. FIG. This is an actually measured sample. The curve represented by the solid line shows the calorie fluctuation (after-suppression fluctuation) of the low calorie gas that comes out of the buffer tank 10 after being sufficiently mixed with time difference. As shown, the calorie of the low caloric gas before entering the buffer tank 10 varies from about 1530 kcal / Nm ³ to about 2360 kcal / Nm ³ . That is, it has a fluctuation range of about ± 21% of the average value (1945 kcal / Nm ³ ). According to the result of theoretical calculation of the calorie fluctuation of the low calorie gas exiting from the buffer tank 10, it is 1780 kcal / Nm ³ to 1960 kcal / Nm ³ and the fluctuation range is about ± 5% of the average value (1870 kcal / Nm ³ ). It is suppressed until. As shown in the drawing, the fluctuation of the short period and the middle period are removed from the fluctuation period, and the fluctuation of the long period remains. This effect tends to become more prominent as the volume of the buffer tank is increased with respect to the supply flow rate of the low calorie gas. If the period of original fluctuation is short and the fluctuation width is small, it is effective to reduce the volume of the buffer tank from the viewpoint of economy.

FIG. 3 shows the state of attenuation of calorie fluctuation when the flow rate of the low calorie gas is 500,000 Nm ³ / hr and the volume of the buffer tank 10 is 100000 m ³ which is half of the above. Sufficient time difference mixing in calorie variance also the buffer tank 10 in this case, 1700kcal / Nm ³ are suppressed in a range of up to 2040kcal / Nm ³ from about ± 9% of the average fluctuation width (1970kcal / Nm ³⁾ It is.

FIG. 4 shows an attenuation state of calorie fluctuation when the volume of the buffer tank 10 is set to 50000 m ³ in the facility in which low calorie gas is supplied at a flow rate of 200000 Nm ³ / hr. Sufficient time difference mixing in calorie variance also the buffer tank 10 in this case, are suppressed in the range of 1740kcal / Nm ³ to 2010kcal / Nm ^3, about ± fluctuation range mean value (1875kcal / Nm ³⁾ 7. 2%.

Although not shown, when the volume of the buffer tank 10 is set to 25000 m ³ which is half of the above in the facility where low calorie gas is supplied at a flow rate of 200000 Nm ³ / hr as described above, the fluctuation range is an average value (1875 kcal / Nm ³ ) Of about ± 12%.

As shown in FIG. 5, in a facility where low calorie gas is supplied at a flow rate of 200000 Nm ³ / hr, two buffer tanks 10 having a volume of 25000 m ³ are installed in parallel, and both are used during normal operation. It can be devised that only one of the tanks is used only for an unsteady situation such as inspection or malfunction.

  Thus, by providing the buffer tank that can realize the time difference mixing of the low calorie gas, the calorie fluctuation of the low calorie gas is greatly suppressed. As a result, the control of mixing air and inert gas downstream is very easy. For example, if the calorie fluctuation range of the fuel gas of the gas turbine 2 is set to ± 10% of the reference calorie value (average value), the average value of the calorie that fluctuates downstream of the buffer tank is given to the gas turbine 2. In order to match the set reference caloric value, it is only necessary to provide a buffer tank having a volume that can meet the specifications and supply a constant ratio of dilution gas. Regarding the air supply operation, it is not necessary to consider the calorie fluctuation of the low calorie gas.

  In an extreme case, if the average value of the calories that fluctuate in the low calorie gas after passing through the buffer tank 10 is substantially equal to the reference calorie value set in the gas turbine 2, it is not necessary to mix the dilution gas. In addition, a facility for supplying dilution gas is not required.

  FIG. 6 shows another buffer tank (hereinafter also simply referred to as a tank) 31. This buffer tank 31 has been modified to be used as a gas holder for a conventional gas turbine facility as a calorie fluctuation suppressing device. That is, the inlet 31a and the outlet 31b are separately formed in the tank 31, and the upstream low calorie gas supply pipe 3 and the downstream low calorie gas supply pipe 3 are connected to these. The gas holder is included in the device 32 for monitoring the gas amount balance. The gas amount balance monitoring device 32 is for balancing the amount of low calorie gas sent from the upstream side and the amount of consumed gas required by the gas turbine. When there are fluctuations in the amount of supplied gas and load fluctuations in the gas turbine, it is necessary to balance between the amount of gas supplied and the amount of consumption. When the supply amount is unexpectedly excessive, it is discharged to the outside of the system. When the supply amount becomes insufficient, the load of the gas turbine is reduced or a part of the operation is stopped.

  The gas amount balance monitoring device 32 includes an internal volume variation type tank 31, a lid member 33 a that is hermetically closed by a seal member 33 c or the like at the upper end opening of the tank 31 and that can be moved up and down in the tank. For example, an adjustment weight 34 connected to the lid member 33a is provided. The lid member 33a has a ceiling and can be called an upper tank that is nested with the lower tank 33b. The seal member 33c is disposed in the gap between the upper tank 33a and the lower tank 33b. The tank moves up and down by the balance between the total weight of the weight of the upper tank 33a, the weight of the weight 34 and the push-down force due to the atmospheric pressure, and the push-up force caused by the internal pressure of the tank 31. Therefore, the lid member 33a moves up and down according to a change in the balance between the supply amount and the consumption amount of the low calorie gas. While monitoring the vertical movement of the lid member 33a, measures such as the out-of-system release of gas and a reduction in turbine load are taken. This gas holder is also used as a buffer tank 31 for low-calorie gas time difference mixing.

  Regardless of the presence or absence of the vertically movable lid member 33a, if the buffer tanks 10 and 31 have a predetermined volume, the above-described low calorific gas time difference mixing is achieved.

  6 to 19 show a configuration in which a device is devised with respect to the flow direction of the gas into the tank so that the time difference mixing of the low calorie gas is more sufficiently performed in the buffer tank. That is, a device has been devised in order to achieve ideal time-difference mixing because a part of the low calorific gas flowing into the tank stays in the tank as long as possible and is sufficiently mixed in the tank. . In brief, the gas inflow direction into the tank is inclined upward or downward from the horizontal direction. As a premise, it will be necessary to make the internal volume of the tank sufficiently large with respect to the volume flow rate of the gas flowing into the tank. For example, like the tank 10 described with reference to FIGS. 6-19, the same code | symbol is attached | subjected to the same member and description for every drawing is abbreviate | omitted.

  The tank 31 of FIG. 6 is the buffer tank 31 using the gas holder as described above, but this is an example, and the tank 10 without the movable lid member 33a is also devised in the inflow direction of this gas. The configuration can be applied. The same applies to the tanks shown in FIGS. 7, 8, 10, 12 to 19, 22, and 23 described later. An inlet 31a and an outlet 31b are formed in the vicinity of the lower end of the peripheral wall of the tank 31, and the low-calorie gas supply pipes 3 on the upstream side and the downstream side are communicated with each other. The low calorie gas supply pipe 3 is arranged almost horizontally, but the upstream side low calorie gas supply pipe 3 connected to the inlet 31a is connected to an inclined pipe member 35 inclined continuously upward. . As a result, the low calorie gas blows obliquely upward into the tank, and most of the gas flow goes around the tank without immediately flowing out from the outlet 31b. As a result, the low calorie gas stays in the tank for a long time and is well mixed. The fact that the position of the outlet 31b deviates from the extension line in the gas inflow direction into the tank also improves the effect of time difference mixing. That is, it is preferable to form the outlet 31b at a position deviating from the extension line of the central axis of the inclined pipe member 35 and the gas inflow device 36 described later. In short, it is preferable to form the outlet 31b at a position deviating from the extension of the central axis of the inlet 10a (31a). This also applies to the other tank 10 (31) described below.

  Further, as illustrated, in order to stir the gas in the tank 31, a stirring device 28 such as a fan may be installed in the tank. This is to promote gas mixing in the tank, thereby realizing more effective time difference mixing. As an installation form of the stirring device 28, it is preferable to install it in the vicinity of the outlet 31b so that the gas can flow from the vicinity of the outlet 31b toward the inside of the tank. This is because it is possible to lengthen the residence time of the gas in the tank by pushing the gas to flow out from the outlet 31b back inward, thereby realizing effective time difference mixing of the gas. Further, for example, an arrangement is preferred in which the gas can flow upward when the outlet is formed in the lower part of the tank and the gas can flow downward when the outlet is formed in the upper part of the tank. The stirring device 28 is not limited to the tank 31 shown in FIG. 6, and can be installed in the tanks 10, 23, 31, 47 shown in other drawings and other tanks that can exert a calorie suppressing effect. It is. In addition, it is preferable to install the electric motor 28a etc. as a rotational drive machine of the stirring apparatus 28 outside the tank.

  Further, as a mechanism for stirring the gas in the tank, a pipe (not shown) for circulating the gas in the tank may be connected to the tank. That is, an inlet and an outlet for gas circulation are formed in the tank wall, and a single pipe for circulation is connected to the inlet / outlet. And the fan similar to the said stirring apparatus 28 is installed in the inside of this piping for circulation. In this way, the operation of the fan causes the gas in the tank to be sucked out from the circulation pipe and re-introduced into the tank, so that the gas is circulated and the gas is agitated in the tank.

  The tank 23 shown in FIG. 7 is an internal volume variation type buffer tank 23 using another type of gas holder. This gas holder positively moves the lid member 24 installed so as to move up and down airtightly in the tank by a drive device 25 via a chain and a cable 26, thereby maximizing the gas supply and demand balance effect during operation. The tank volume that can be determined is determined. As shown in the figure, the lid member 24 is reduced in size and weight so that it can be applied to a large-capacity tank, and the drive system for moving up and down can be simplified. Such a gas holder is also formed by separately forming an inlet 23a and an outlet 23b for low calorie gas, connecting the upstream low calorie gas supply pipe 3 to the inlet 23a, and connecting the downstream low calorie gas supply pipe 3 to the outlet 23b. It can be used as a buffer tank that exhibits a calorie fluctuation suppressing effect. An inclined pipe member 35 inclined continuously upward is also connected to the upstream low calorie gas supply pipe 3 connected to the inlet 23a. Reference numeral 27 denotes a pulley that supports the cable 26.

  However, the low-calorie gas supply pipe 3 on the upstream side is piped downward from the bottom of the tank 23. The inlet 23a of the tank 23 is opened near the periphery of the tank bottom, and the inclined pipe member 35 is inclined upward from below the tank bottom and connected to the inlet 23a. Also with this configuration, effective time difference mixing is realized as in the tank 31 of FIG. Further, since the inlet 23a is opened at the bottom of the tank, the allowable range of height variation of the lid member 24 can be extended to the vicinity of the bottom of the tank, and the internal volume of the tank 23 can be utilized to the maximum.

  The tanks 31 and 23 (FIGS. 6 and 7) described above are provided with the inclined pipe member 35 inclined upward, but the present invention is not limited to this configuration. For example, in the fixed-shaped tank 10 having no lid member, an inlet and an outlet can be formed near the upper end of the peripheral wall of the tank, and the low calorie gas supply pipe 3 can be connected to these. In that case, an inclined pipe member that is continuously inclined downward is connected to the tip of the upstream-side low calorie gas supply pipe 3. That is, the inclination direction of the inclined pipe member may be selected according to the height of the connection position of the upstream low calorie gas supply pipe 3 to the tank.

  In the tank 31 shown in FIG. 8, an inlet 31a and an outlet 31b are formed near the lower end of the peripheral wall. Both the upstream and downstream low calorie gas supply pipes 3 are arranged almost horizontally. The inlet 31a is provided with a gas inflow device 36 for changing the gas inflow direction into the tank, and an upstream low calorie gas supply pipe 3 is connected to the gas inflow device 36. The tank 31 originally has a function of generating a flow of gas that has flowed into the tank 31 and trying to mix it uniformly. However, the mode of the gas flow is changed by the gas flow-in device 36 and the control device 5 that controls this operation. And the uniform mixing effect can be further improved.

  As is apparent from FIG. 9 as well, the gas inflow device 36 includes a housing 37 formed as a part of the upstream low calorie gas supply pipe outside the tank inlet 31 a, and an interior of the housing 37. It has a plurality of variable louvers 38 which are accommodated at intervals in the vertical direction. Each variable louver 38 is disposed substantially horizontally, and its rotating shaft 39 projects out of the housing 37. The protruding portion of the rotating shaft 39 can be rotated by known means such as an electric motor, a hydraulic motor, a pneumatic cylinder, a hydraulic cylinder, and the louver 38 can be swung in the vertical direction. When the louver 38 is swung in the vertical direction, the gas inflow direction can be changed accordingly. Therefore, it is possible to incline the gas flow upward as in the inclined pipe member 35 shown in FIGS. The number of louvers to be installed is not limited and may be one or more. When the number is large, the effect of determining the inflow direction is improved, but the inflow resistance tends to increase.

  Further, as shown in FIG. 9, an inclination direction indicator 39a is installed on the rotation shaft 39 protruding to the outside of the housing 37, and the inclination direction of the louver 38 from the outside of the gas inflow device 36, that is, the inflow of gas. The direction can be displayed. Further, the inclination direction of the louver 38 may be detected by a detector (not shown), and a detection signal thereof may be transmitted to the control device 5 and displayed on a remote display device (not shown) based on the detection signal. Further, a see-through window may be formed in the housing 37 so that the inclination direction of the louver 38 can be confirmed from the outside.

  Further, as shown in the figure, in the case of the tank 31 provided with the vertically movable lid member 33a, the ceiling moves up and down, but the ceiling position signal is inputted to the control device 5, and the optimum gas inflow according to this position signal. The direction can be selected. For example, in order to further incline the gas inflow direction when the lid member 33a is raised, the louver 38 is swung upward so that the elevation angle from the horizontal is increased. When the lid member 33a is lowered, the louver 38 is swung so that the elevation angle from the horizontal becomes smaller in order to incline the gas inflow direction below the current direction.

  In addition, the plurality of calorimeters 12 described above are attached to the tank 31 (including the lid member 33a) in FIG. The degree of time difference mixing of the gas in the tank 31 can be known from the measured value of the calorimeter 12. It can be determined that the time difference mixing is more effectively performed as the difference in calorie value of each part in the tank 31 (so-called calorie value distribution) is smaller. The calorimeter 12 continuously measures the calorie value while changing the inclination angle of the louver 38 by the control device 5. By doing so, it is possible to know the optimum inclination angle of the louver 38 for the time difference mixing. In addition, the optimum inclination angle can be known for each of other conditions such as the height position of the lid member 33a of the tank 31. If this data is stored in the control device 5, the control device 5 can control the louver 38 to an optimum angle based on the distribution of calorie values in the tank during operation.

  An inlet calorimeter 8 and an outlet calorimeter 9 are installed in the upstream and downstream low calorie gas supply pipes 3 connected to the tank 31 of FIG. Since the calorimeters 8 and 9 continuously measure the gas calorie value, the calorie fluctuation in the low calorie gas supply pipe 3 on the upstream side and the downstream side can be detected. Since the control device 5 receives the signals indicating the gas calorie fluctuation on the upstream side and the downstream side thereof, the control device 5 can detect the degree of the effect of suppressing the calorie fluctuation by the tank 31 by comparing them. Therefore, the control device 5 calculates the deviation between the set value and the detected value of the calorie fluctuation suppression level, and the inclination angle of the louver 38 is adjusted so as to fill this deviation (so that the uniform time difference mixing effect is maximized). Control.

  For example, the calorimeter values are continuously measured by the calorimeters 8 and 9 while changing the inclination angle of the louver 38 by the control device 5. By doing so, it is possible to know the optimum inclination angle of the louver 38 for the time difference mixing. Further, it is possible to know the optimum inclination angle for each of other conditions such as the height position of the lid member 33a of the tank 31 described above. If this data is stored in the control device 5, it is possible to control the louver 38 at an optimum angle so as to fill the deviation between the set value of the calorie fluctuation suppression level and the detected value by the control device 5 during operation. Become.

  The gas inflow device 36 of the tank 31 of FIG. 8 houses a variable louver 38 inside a housing 37 installed outside the tank, but is not limited to this configuration. For example, the variable louver 38 may be installed at a position close to the inlet in the tank so as to be swingable from the outside of the tank without providing a housing.

  FIG. 10 shows a tank 31 provided with a gas inflow device 36 incorporating a variable louver 38 as described above in the vicinity of the periphery of the bottom. The low-calorie gas supply pipe 3 on the upstream side is piped downward from the bottom of the tank 31, and the inlet 31a of the tank 31 is opened near the periphery of the tank bottom. A gas inflow device 36 is installed below the opening 31a. Also with this configuration, effective time difference mixing is realized by detection by the calorimeters 8, 9, and 12 and control by the control device 5, as in the tank 31 of FIG. 8.

  The gas inflow device for changing the gas inflow direction is not limited to the device 36 provided with the variable louver 38. Any known suitable means capable of arbitrarily changing the gas inflow direction from the outside can be adopted. The gas inflow device 36 is not limited to the tank 31 provided with the movable lid member 33a, but can be installed in a fixed tank 10 (see FIGS. 1 and 11) whose volume cannot be changed.

  The gas inflow device 36 described above can also be used to change the flow of gas flowing into the tank in the lateral direction. That is, the entire gas inflow device 36 is attached to the tanks 10, 23, and 31 so as to be rotatable around the central axis in the range of 0 ° to 90 °. In this way, as described above, the calorimeters 8, 9, and 11 can continuously check the calorie fluctuation suppressing effect in the tank while changing the gas flow direction in the lateral direction to set the optimum inflow direction. .

  An inlet 10a and an outlet 10b are formed in the vicinity of the lower end of the peripheral wall of the tank 31 shown in FIG. 11, and a low-calorie gas supply pipe 3 on the downstream side is connected to the outlet 10b. The low calorie gas supply pipe 3 is inserted into the tank. In the tank, an inclined pipe member 35 inclined upward is detachably connected to the tip of the low calorie gas supply pipe 3 on the upstream side by a connecting member 40 such as a flange. Of course, the low-calorie gas supply pipe 3 on the upstream side may be connected to the inlet 10a, and the inclined pipe member 35 may be detachably connected to the inner side of the inlet 10a. Since the tank 10 does not have a movable lid member and the ceiling height is fixed, it is not necessary to frequently change the gas inflow direction. Therefore, when the flow rate of the low calorific gas is significantly changed, it is possible to replace the inclined pipe member 35 with a different inclination angle. Further, by rotating the inclined pipe member 35 around the center axis of the low calorie gas supply pipe 3 (for example, by shifting the bolt holes of the flanges 40 by one pitch or more), the inclined pipe member 35 is attached to the low calorie gas supply pipe 3. The inflow direction can be changed not only vertically but also horizontally (laterally). By rotating and changing the inclined pipe member 35 having a different inclination angle around the central axis of the low calorie gas supply pipe 3 as described above, the inflow direction can be changed only to the left and right without changing up and down.

  The tank 31 shown in FIG. 12 has three inlets 31a, and branch pipes (upstream branch pipes) 3a of the upstream low calorie gas supply pipe 3 are connected to the inlets 31a through inclined pipe members 35. Yes. The number of the inlets 31a and the upstream branch pipes 3a is not limited to three, and may be plural. The plurality of inlets 31a are formed on the peripheral wall (or the bottom portion) of the tank at intervals. Each upstream branch pipe 3a is provided with a stop valve (which may be a flow control valve) 41, which can be appropriately selected and opened / closed. The control device 5 sequentially opens and closes the three stop valves 41 and switches the three upstream branch pipes 3a periodically or aperiodically, thereby changing the gas inflow position into the tank. Can be made.

  Alternatively, by using a flow control valve instead of the stop valve 41, the flow rate of the gas passing through the three upstream branch pipes 3a can be varied periodically or aperiodically. In this way, the control device 5 performs control so as to optimize the mode of gas flow in the tank. This optimal mode applies a data set that is most suitable for similar operating conditions (gas calorie, gas flow rate, gas composition, residence time in tank, etc.) based on a data set created based on a lot of operation data. be able to. Although the inclined pipe member 35 does not need to be interposed, more effective time difference mixing is realized by attaching the inclined pipe member 35.

  In addition, the inclination angles in the direction of the central axis of the plurality of inclined pipe members 35, particularly the vertical direction, may be varied. In this way, it is possible to select an appropriate gas inflow direction in response to a change in conditions such as a change in the ceiling height of the tank.

  Although not shown in FIG. 12, a plurality of downstream branch pipes may be provided together with the plurality of upstream branch pipes 3a. A stop valve or a flow control valve may be attached to each downstream branch pipe, and may be configured so as to be opened and closed by appropriately selecting them. According to this configuration, the control device 5 switches the three upstream branch pipes 3a periodically or aperiodically or changes the flow rate, and the downstream branch pipes are also periodically or aperiodic. Or change the flow rate. Therefore, it is possible to realize a more preferable gas flow mode for the time difference mixing of the gas as compared with the control of only the upstream branch pipe 3a described above.

  12A, which is a plan view of the tank 31, is connected to a position where the upstream branch pipe 3a and the downstream low calorie gas supply pipe 3 face each other (position of 180 ° with respect to the central axis of the tank). The configuration is not limited to this. The position which does not oppose may be sufficient. For example, the pipes 3a and 3 may be connected to a position at an angle of 90 °, 120 °, 135 °, or the like. This is because the gas may stay in the tank longer. This is also true for other tanks (FIGS. 6 to 8, 10, 11, and 13 to 19).

  A tank 31 shown in FIG. 13 has the same gas inflow device 36 (see FIG. 9) attached to each of a plurality of inlets 31a of the tank 31 of FIG. Here, the description of the gas inflow device 36 is omitted. The tank 31 may be provided with the plurality of downstream branch pipes described above. According to this configuration, in addition to the effect of the time difference mixing by the control described with reference to FIG. 12, it is possible to control the gas flow direction by the variable louver 38. Therefore, a more preferable mode of gas flow for the time difference mixing of the gas Can be realized.

  FIG. 14 to FIG. 19 each show a tank 31 having a mechanism for introducing an inert gas for diluting low calorie gas into the tank. In the low calorie gas supply pipe 3 shown in FIG. 1, a dilution gas supply pipe 4 for supplying a dilution gas such as an inert gas is disposed downstream of the buffer tank 10. As described above, when the average calorie value of the low calorie gas after the calorie fluctuation is suppressed by the buffer tank 10 (31) exceeds the allowable calorie value range specific to the gas turbine, the calorie value is set by the dilution gas. The purpose is to reduce. However, if the dilution gas necessary for lowering the average calorie value is introduced into the buffer tank 10 (31) in advance, can the calorie control performed using the dilution gas supply pipe 4 be simplified? Or is unnecessary. For example, the average calorie value of the low-calorie gas on the inlet side is calculated from the detection result of the inlet calorimeter 8, and when this average calorie value exceeds the allowable calorie value range specific to the gas turbine, the calorie value is reduced within the allowable range. Fill the tank with the necessary amount of dilution gas. Alternatively, when the average caloric value of the low-calorie gas on the inlet side rises rapidly, a necessary amount of dilution gas is introduced into the tank so as to be approximately equal to the average caloric value on the outlet side at that time.

  However, it is desirable not to focus only on the quantitative relationship between the low calorie gas and the inert gas to be introduced, but to promote the mixing of both gases in addition to this. For this reason, a suitable inert gas supply mechanism is connected to the tank 31 together with the dilution gas supply pipe 4 or in place of the pipe 4 in the tank 31 shown in FIGS. As described above, when supplying an inert gas to the low calorie gas supply pipe 3 separately from the low calorie gas from the tank 10 (23, 31, 47) or upstream thereof, the flow meter 11 (see FIG. 1), a flow meter 29 for measuring only the flow rate of the low calorie gas is installed in the low calorie gas supply pipe 3 upstream from the supply point of the inert gas (see FIGS. 14 to 19).

  The upstream low calorie gas supply pipe 3 is connected to the inlet 31a of the tank 31 shown in FIGS. 14 and 15 through the same inclined pipe member 35 as shown in FIGS. Detailed description of this point is omitted. However, an inert gas supply pipe 42 is inserted into and connected to the upstream side low calorie gas supply pipe 3, and its tip is opened so that the inert gas is mixed into the flow of low calorie gas. Yes. Therefore, the range in which the inert gas supply pipe 42 is inserted in the low calorie gas supply pipe 3 is configured as a double pipe. The flow rate of the inert gas is preferably lower than the flow rate of the low calorie gas from the viewpoint of improving the mixing property. With the configuration described above, the inert gas is introduced into the tank in the same inflow direction as the low calorie gas, and the inert gas is prevented from being unevenly distributed in the low calorie gas.

  A tank 31 shown in FIGS. 16 and 17 is provided with a gas inflow device 36 as shown in FIG. 9 in place of the inclined pipe member 35 of the tank 31 shown in FIGS. 14 and 15. Description of the structure and function of the gas inflow device 36 is omitted. Since the tank 31 includes a double pipe of the low calorie gas supply pipe 3 and the inert gas supply pipe 42, the low calorie gas and the inert gas flowing into the tank even if the inflow direction is changed by the variable louver 38. Flows in the same direction. Such a configuration prevents the inert gas from being unevenly distributed in the low calorie gas in the tank. The double tube may be a multiple tube such as a triple tube as required.

  Two adjacent inlets 31a and 42a are formed in the tank 31 shown in FIG. An upstream low calorie gas supply pipe 3 is connected to one inlet 31a via an inclined pipe member 35, and an inert gas supply pipe 42 is connected to the other inlet 42a via an inclined pipe member 35. . The inclination angles of the two inclined pipe members 35 from the horizontal are substantially the same so that the inflow directions of the low calorie gas and the inert gas into the tank are substantially parallel. The low calorie gas supply pipe 3 and the inert gas supply pipe 42 are arranged close to each other as shown in the drawing, but may be arranged close to each other in the lateral direction.

  Of the tanks described above, those using the inclined pipe member are not particularly limited to the inclined pipe member. Other suitable means that can incline the gas inflow direction in a fixed manner may be used. For example, a housing containing a louver with a fixed inclination angle may be installed at the tank inlets 10a and 31a, or a louver with a fixed inclination angle may be installed near the inlet inside the tank.

  In the tank 31 shown in FIG. 19, a gas inflow device 36 as shown in FIG. 9 is disposed at the inlet 42a for the inert gas supply pipe instead of the inclined pipe member 35 of the tank 31 shown in FIG. . Description of the structure and function of the gas inflow device 36 is omitted. In this tank 31, the low calorie gas supply pipe 3 and the inert gas supply pipe 42 that are close to each other are provided with the gas inflow device 36, so that the inflow directions of both gases can be made substantially the same. However, in a special case where the inflow speeds of both gases into the tank are different, the inflow directions of both gases can be changed, so that various controls are possible. With this configuration, the inert gas is prevented from being unevenly distributed in the low calorie gas in the tank.

  As the inert gas charged into the tank 10 (31) described above, waste nitrogen released from an oxygen production plant used in the blast furnace method and direct reduced iron methods such as the FINEX method and the COREX method, and oxygen It is preferable to use waste nitrogen containing a small amount of oxygen discharged from a nitrogen production plant attached to the production plant. This is because the operation cost is extremely low because a large amount of nitrogen is recovered and used.

  In the case of a direct reduction iron method such as the FINEX method or the COREX method, oxygen is used as a reducing agent, so it is essential to install an oxygen production plant that produces a large amount of oxygen. Since oxygen is also used in the blast furnace method, an oxygen production plant is used even if there is a difference in scale. The oxygen production plant separates nitrogen from air to produce oxygen, but the exhaust gas after the separation of oxygen is normally released to the atmosphere as waste nitrogen. On the other hand, high-purity nitrogen is often produced by adding a nitrogen production plant to the oxygen production plant, but even in this case, nitrogen containing a small amount of oxygen is released to the atmosphere as waste nitrogen. Such waste nitrogen has a gas composition of about 95 to 98% by mass of nitrogen gas and about 2 to 5% of oxygen, and is a very safe dilution gas from the viewpoint of the flammability limit of low calorie gas. . Of course, pure nitrogen filled in a cylinder or the like may be used.

  In order to dilute the low calorie gas as in the case of the inert gas supply pipe 42, a facility for supplying air or exhaust gas generated in the combustion facility into the tank may be provided instead of the inert gas. As a supply method, it is directly supplied to the tank as in the case of the inert gas, or is supplied to a low calorie gas supply pipe upstream of the tank. However, since air and exhaust gas contain oxygen, it is necessary to determine the mixing ratio to low calorie gas based on the flammability limit of low calorie gas. Furthermore, it is necessary to mix well with the low calorie gas so as not to generate a portion having a high concentration of oxygen. Therefore, it is desirable to install a mixer at the connection between the air or exhaust gas supply pipe and the tank or low calorie gas supply pipe.

  In the tank 31 described with reference to FIGS. 12, 13, and 19, the upstream low calorie gas supply pipe is arranged so that the inflow directions of the low calorie gas (and the inert gas) flowing in from a plurality of pipes are parallel in a plan view. 3. The orientation of the inclined pipe member 35 and the gas inflow device 36 is connected to the tank after orientation. However, it is not limited to such a configuration. For example, you may comprise so that a gas inflow direction may flow in the direction which faces the central axis of a tank by planar view.

20 and FIG. 21, the result of the simulation of the time difference mixing of the gas in the buffer tank 10 is shown as a curve representing the relationship between the residence time and the accumulated gas flow rate. In both figures, the residence time (minutes) of the gas in the tank is plotted on the horizontal axis, and the ratio of the retained gas is plotted on the vertical axis. The curve in the graph of FIG. 20 shows a state where the gas is completely mixed. That is, the gas flows into the tank from the inlet, and at the same time, the gas is mixed with the gas that has existed in the tank until then. These figures show simulation results under conditions where the tank volume is 40000 m ^{3 and} the flow rate of the inflowing gas is 5 Nm ³ / hr.

  The meaning of this graph indicates the ratio of the gas flowing out from the outlet at a predetermined time shown on the horizontal axis, that is, the ratio to the gas volume of the entire tank. A numerical value of 1.0 on the vertical axis represents the gas volume of the entire tank. For example, the gas flowing out from the outlet for 100 seconds (indicated by reference numeral H1) of a numerical value on the horizontal axis in the figure from 500 seconds to 600 seconds (this indicates the time elapsed since flowing into the tank, ie, the residence time) The ratio V1 of the entire tank to the gas is about 0.689-about 0.621 = about 0.068 (about 6.8%). In other words, the gas staying between 500 seconds and 600 seconds after flowing into the tank is about 6.8% of the total gas in the tank. The gas that has not passed 100 seconds since flowing into the tank (remaining only after 0 to 100 seconds, indicated by H2) is about 0.176-0 = about 0.176. There is about 17.6% of the total (indicated by V2), but the gas staying between 900 seconds and 1000 seconds after entering the tank (indicated by H3) is about 0.00. From 863 to about 0.834 = about 0.029, it can be seen that only about 2.9% of the whole is present (indicated by V3).

  Ideally, the time difference mixing is ideal when the gas is mixed at the same rate regardless of the elapsed time from the inflow, that is, the line shown in the graph is a straight line. However, this is a state that does not actually exist. It is reasonable to consider the state where complete mixing as shown in FIG. 20 is performed as the state where the best time difference mixing is performed.

  FIG. 21 shows a simulation result of the time difference mixing of the gas flowing in the direction of three kinds of elevation angles from the tank inlet under the same condition so as to be able to be compared with the above-described complete mixing state. The complete mixed state is indicated by a solid line, the case of flowing in at an elevation angle of 60 ° from the horizontal is indicated by a two-dot chain line, the case of flowing in at an elevation angle of 65 ° from the horizontal is indicated by a one-dot chain line, and 90 ° from the horizontal. The case of flowing in at an elevation angle (substantially vertically upward) is indicated by a broken line. In any case that flows at an elevation angle, a close curve is drawn even if it does not coincide with the completely mixed state. That is, it can be said that good time difference mixing is performed. As a result, as described with reference to FIGS. 2 to 5, the variation in gas calorie is effectively suppressed.

  FIG. 22 shows a buffer tank installed in parallel to the low calorie gas supply pipe 3, in other words, a buffer tank installed in a bypass pipe attached to the low calorie gas supply pipe 3. In this buffer tank, a gas holder installed in an existing low calorie gas supply facility is also used as a gas calorie fluctuation suppressing device by a slight structural change. The gas holder installed in the conventional low calorie gas supply equipment is connected to the low calorie gas supply pipe 3 only by one communication pipe. This single communication pipe doubles as an entrance. Since the gas holder only needs to balance the supply and demand of the gas in the low calorie gas supply pipe, the gas holder may be connected to the low calorie gas supply pipe with a single communication pipe.

  As shown in the figure, the communication pipe 43 is connected to the tank 31, and in addition to the communication pipe 43, an inlet pipe 44 is newly connected to the low calorie gas supply pipe 3. The inlet pipe 44 and the communication pipe 43 constitute the bypass pipe. The inlet pipe 44 is connected to the upstream side of the connecting portion with the communication pipe 43 of the low calorie gas supply pipe 3. The inlet pipe 44 is provided with a fan 45 as a gas pressure feeding device for feeding low calorie gas into the tank 31. Therefore, a part of the low caloric gas supplied flows into the tank 31 through the inlet pipe 44, and the low caloric gas is mixed with time in the tank 31, and the same amount of gas passes from the tank 31 through the communication pipe 43. Return to the calorie gas supply pipe 3. Therefore, in this case, the communication pipe 43 can also be called an outlet pipe.

  Although not shown, the inclined pipe member 35 or the gas inflow device 36 is connected to the inlet 31a of the tank to which the inlet pipe 44 is connected. The tank 31 suppresses the calorie fluctuation of a part of the low calorie gas supplied to the gas turbine by the low calorie gas supply pipe 3.

  FIG. 23 shows another gas amount balance monitoring device 46 that can be used as calorie fluctuation suppressing means. This gas amount balance monitoring device 46 has a more economical configuration, and has an airtight tank 47 in which an inlet 47a and an outlet 47b are connected to the low calorie gas supply pipe 3 through a communication pipe 43 and an inlet pipe 44, respectively. Have. The tank 47 is provided with a pressure detection device 48, and the internal pressure of the tank 47 is constantly monitored. When the detected pressure reaches the upper limit range, the control device 5 issues a command to increase the gas consumption in the facility, and balances the gas supply and demand. The other structure is the same as that of the above-described buffer tank 10 (see FIG. 1), and can be sufficiently used as calorie fluctuation suppressing means.

  Although not shown, the inclined pipe member 35 or the gas inflow device 36 is connected to the inlet 47a of the tank to which the inlet pipe 44 is connected. The tank 47 suppresses the calorie fluctuation of a part of the low calorie gas supplied to the gas turbine by the low calorie gas supply pipe 3.

FIG. 24 shows that in a facility in which low-calorie gas varying in calories is supplied at a flow rate of 500,000 Nm ³ / hr, the volume of the tank 31 (47) in FIG. 22 or FIG. 23 is set to 200,000 m ³ , and the fan 45 causes 500,000 Nm ³ / hr. It is a graph which shows the suppression state of a calorie fluctuation | variation in case the gas of 200000Nm < ³ > / hr is sent into the tank 31 (47) among them. The curve shown with a broken line in the figure shows the calorie fluctuation (original fluctuation) of the low calorie gas sent directly from the reduced iron facility S. This is the actual measurement sample described above. A curve represented by a two-dot chain line indicates a simulation result of calorie fluctuation (transient fluctuation) of the low calorie gas that leaves the tank and passes through the communication pipe 43. A curve indicated by a solid line indicates a calorie fluctuation (after-suppression fluctuation) of the gas flowing in the low calorie gas supply pipe 3 portion downstream from the point where the communication pipe 43 is connected to the low calorie gas supply pipe 3. As before, the calorie of the low calorie gas before entering the tank 31 (47) has a fluctuation range of about ± 21% of the average value (1945 kcal / Nm ³ ). However, the calorie fluctuation of the gas after joining the tank 31 (47) through the communication pipe 43 to the low calorie gas supply pipe 3 is from 1690 kcal / Nm ³ to 2100 kcal / Nm ³ , and the fluctuation range is an average value (1895 kcal). / Nm ³ ) of about ± 11%. This number is an example.

  In this way, it is possible to suppress fluctuations in gas calorie using the existing equipment having the gas holder tank 31 (47). Then, the low calorie gas can be easily diluted with air downstream. In FIG. 22 and FIG. 23, the inlet pipe 44 for feeding the low calorie gas into the tank 31 (47) is connected to the upstream side of the outlet pipe (communication pipe) 43 in the low calorie gas supply pipe 3. However, it may be connected to the downstream side of the outlet pipe 43. A plurality of both the tubes 43 and 44 may be provided.

  FIG. 25 also shows a buffer tank 31 installed in parallel to the low calorie gas supply pipe 3 as in the tank of FIG. As illustrated, between the tank 31 and the low calorie gas supply pipe 3, an inlet pipe 44 including a fan 45 and the communication pipe 43 serving as an outlet pipe are connected. That is, an inlet pipe 44 is connected to the inlet 31a of the tank 31, and an outlet pipe 43 is connected to the outlet 31b. However, a further inlet 49a is formed in the tank 31, and a return pipe 49 is connected to the inlet 49a. The return pipe 49 is connected to the downstream side of the connection portion with the outlet pipe 43 in the low calorie gas supply pipe 3. The return pipe 49 is provided with a fan 45 for sending low calorie gas into the tank 31. As shown, the connection positions (inlet 31a, 49a) of the inlet pipe 44 and the return pipe 49 to the tank 31 are close to each other.

  According to this configuration, a part of the low calorie gas is pumped to the tank 31 from the upstream side of the low calorie gas supply pipe 3 through the inlet pipe 44, and at the same time, one low calorie gas is supplied from the downstream side of the low calorie gas supply pipe 3 through the return pipe 49. The part is pumped, mixed with time difference, and flows out from the outlet 31b to the communication pipe. That is, since a part of the low calorie gas in which the calorie fluctuation is suppressed circulates, the time difference mixing over a long time is realized in the tank. As the length of the return pipe 49 is increased, the residence time of the gas subjected to the time difference mixing becomes longer, and a more preferable time difference mixing is realized. The return pipe 49 is connected to the inlet 49a of the tank 31 from the downstream side of the low calorie gas supply pipe 3, but is connected from the downstream side to the upstream side from the connection portion with the inlet pipe 44 of the low calorie gas supply pipe 3. Also good.

  FIG. 26 also shows a buffer tank 31 installed in parallel to the low calorie gas supply pipe 3. As illustrated, between the tank 31 and the low calorie gas supply pipe 3, the inlet pipe 44 and the communication pipe 43 serving as the outlet pipe are connected. However, the inlet pipe 44 is connected to the downstream side of the connection portion with the communication pipe 43 of the low calorie gas supply pipe 3. The inlet pipe 44 is provided with a fan 45 for sending low calorie gas into the tank 31. In other words, the pipe between the buffer tank 31 and the low calorie gas supply pipe 3 in FIG. 26 removes the inlet pipe 44 from the buffer tank 31 shown in FIG. 25, and the return pipe 49 shown in FIG. The configuration is regarded as 44.

  According to such a configuration, even if the inlet pipe 44 is connected to the downstream side of the connection portion with the communication pipe 43 in the low calorie gas supply pipe 3, the low calorie gas is sent into the tank 31 through the inlet pipe 44 by the fan 4. After time difference mixing, it flows out from the outlet 31b to the communication pipe. That is, since a part of the low calorie gas in which the calorie fluctuation is suppressed circulates, effective time difference mixing is performed. The longer the length of the inlet pipe 44, the longer the time difference mixing in the tank.

  The tank 31 shown in FIG. 27 has two types of inlets 31a and 49a. One inlet 31a is connected to the upstream low calorie gas supply pipe 3, the outlet 31b is connected to the downstream low calorie gas supply pipe 3, and the other inlet 49a is connected to the downstream low calorie gas supply pipe 3. A return pipe 49 is connected. The two inlets 31a and 49a are formed close to each other. The return pipe 49 is provided with a fan 45 for sending low calorie gas into the tank.

  According to such a configuration, a part of the low calorie gas in which the calorie fluctuation is suppressed in the tank 31 is returned to the tank 31 again, and the time difference mixing is performed again, so that a more preferable time difference mixing is realized. As the length of the return pipe 49 is increased, the residence time of the gas mixed by time difference is increased. The return pipe 49 is connected to the inlet 49a of the tank 31 from the downstream side of the low calorie gas supply pipe 3, but may be connected to the upstream side of the tank in the low calorie gas supply pipe 3 from the downstream side.

  The inclined pipe member 35 and the gas inflow device 36 can be applied to the upstream low calorie gas supply pipe 3 and the return pipe 49 connected to the buffer tank 31 (FIGS. 25 to 27).

  FIG. 28 shows a boiler facility. In this boiler facility, a boiler 52 and a low-calorie gas supply facility 51 for supplying low-calorie gas as fuel to the boiler 52 are arranged. The boiler 52 burns gas with a burner to generate steam and uses it for power generation, or uses the generated steam for steam supply for other purposes.

  The low calorie gas supply facility 51 is obtained by removing the devices installed in the low calorie gas supply pipe 3 and the mixed gas supply pipe 13 on the downstream side of the buffer tank 10 from the low calorie gas supply facility 1 shown in FIG. That is, the illustrated low calorie gas supply facility 51 includes a low calorie gas supply pipe 53 that supplies low boiler gas generated in the directly reduced iron facility S as fuel to the boiler 52. In the low calorie gas supply pipe 53, a dust collector 7 for removing dust from the low calorie gas directly sent from the reduced iron facility S, a buffer tank 10 for primarily storing the low calorie gas, an upstream side of the buffer tank 10, and On the downstream side, calorific value detection devices 8 and 9 for detecting the calorific value of the low calorie gas, and a flow meter 54 for measuring the supply amount of the low caloric gas are installed. The same components as those of the low calorie gas supply facility 1 shown in FIG.

  The buffer tank installed in the low calorie gas supply equipment 51 for the boiler is not limited to the fixed-shaped tank 10 whose volume does not change as shown in FIG. 28, and the other tanks 23, 31, 47 described above can also be applied. . This low calorie gas supply facility 1 is not provided with a dilution gas supply facility. Although it is desirable for the boiler to suppress the calorie fluctuation itself by the buffer tanks 10, 23, 31 and 47 in order to obtain a stable output, the calorie having a height as high as the calorie fluctuation of the low calorific gas described above is obtained. This is because the value does not cause a big problem.

  In FIG. 28, only the boiler 52 is installed as the combustion facility that is the supply target of the low calorie gas by the low calorie gas supply facility 51. However, it is not limited to such a configuration. A gas turbine 2 (FIG. 1) may be installed together with the boiler 52, or another combustion facility may be provided. For example, when the gas turbine 2 and the boiler 52 shown in FIG. 1 are provided side by side, a boiler is provided from the downstream side of the calorimeter 9 in FIG. 28 to a portion between the calorimeter 9 and the flow meter 11 in the low calorie gas supply pipe 3 in FIG. What is necessary is just to connect so that the low calorie gas supply piping 53 to 52 may be branched.

  In the embodiment described above, the gas turbine and the boiler are exemplified as the combustion facility, but the combustion facility in the present invention is not limited to the gas turbine and the boiler. The gas calorie fluctuation suppressing device and the low calorie gas supply facility described here can also be applied to other combustion facilities such as a heating furnace and an incinerator.

  In the embodiment described above, the by-product gas generated by the direct reduction iron manufacturing method is exemplified as the low calorie gas to be used. However, the present invention is not limited to this. Low calorie gas includes blast furnace gas (BFG), coke oven gas (COG), converter gas (LDG), coal bed gas contained in the coal bed (Coal mines gas, expressed as CMG), smelting reduction iron making By-product gas generated, tail gas generated in GTL (Gas-to-Liquid) process, by-product gas generated from oil sand during oil purification process, gas generated by dust incineration using plasma, Low-calorie gas such as by-product gas generated by chemical reaction of methane gas (Landfill gas) generated in the process of fermentation and decomposition of general waste including raw garbage in the landfill Is included. Needless to say, the present invention can be applied even when two or more kinds of gases are appropriately mixed and used as a mixed gas of BFG and COG.

  According to the present invention, when low calorie gas that can change calorie like process by-product gas is supplied as fuel gas to combustion equipment such as a gas turbine, calorie fluctuation of low calorie gas can be suppressed. Dilution is done effectively and easily. Further, there is a case where dilution with a dilution gas is unnecessary. It is also possible to construct an apparatus that suppresses fluctuations in gas calories by using existing gas holders.

Claims (28)

A tank for temporarily storing fuel gas, disposed in a fuel gas supply passage for supplying gas to the combustion facility as fuel;
A gas inlet formed in the tank for the fuel gas to flow into the tank from the fuel gas supply passage;
A gas calorie fluctuation suppressing device having a gas outlet formed in the tank separately from the gas inlet and through which the fuel gas flows from the tank to the fuel gas supply passage.   The gas calorie fluctuation suppressing device according to claim 1, wherein the gas inlet is configured to allow fuel gas to flow into the tank in a direction inclined upward or downward from the horizontal. Including an inclined pipe member formed continuously in a fuel gas supply passage communicating with the gas inlet;
The gas calorie fluctuation suppressing device according to claim 2, wherein the inclined pipe member is inclined upward or downward from the horizontal. Including a fixed louver disposed in one of the fuel gas supply passage and the tank in the vicinity of the gas inlet;
The gas calorie fluctuation suppressing device according to claim 2, wherein the fixed louver is at least one louver having a fixed inclination angle. Including a gas inflow device installed at the gas inlet,
The gas calorie fluctuation suppressing device according to claim 2, wherein the gas inflow device is configured to be able to change an inflow angle of the fuel gas into the tank. The gas inflow device has a variable louver disposed in one of the fuel gas supply passage and the tank in the vicinity of the gas inlet;
6. The gas calorie fluctuation suppressing device according to claim 5, wherein the variable louver is at least one louver that is swingably mounted so that an inclination angle thereof can be changed from the outside.   3. The gas calorie fluctuation suppressing device according to claim 1, wherein a plurality of the gas inlets are formed, and a gas inlet through which the fuel gas flows into the tank can be selected and switched among the gas inlets. .   The gas calorie fluctuation suppression according to claim 7, wherein a plurality of the gas outlets are formed, and the gas outlets for allowing the fuel gas to flow out of the tank can be selected and switched in synchronization with the switching of the gas inlets. apparatus.   The gas calorie fluctuation suppressing device according to claim 7 or 8, wherein the inflow directions of the fuel gas into the tanks of the plurality of gas inlets are different from each other. A plurality of the gas inlets are formed,
A flow rate adjusting device installed in a fuel gas supply passage communicating with each gas inlet;
3. The gas calorie fluctuation suppressing device according to claim 1, wherein the gas calorie fluctuation suppressing device is configured to change a flow rate of the gas flowing through each fuel gas supply passage.   The gas calorie fluctuation suppressing device according to any one of claims 1 to 10, further comprising an inert gas supply passage connected to the tank for allowing an inert gas to flow into the tank. An inert gas supply passage connected to be inserted into the fuel gas supply passage communicated with the gas inlet;
The gas calorie fluctuation suppressing device according to any one of claims 1 to 10, wherein an outlet end of the inert gas supply passage is located upstream of the gas inlet.   The gas calorie fluctuation suppressing device according to claim 11 or 12, wherein the inert gas is a recovery of waste nitrogen discharged from at least one of an oxygen production plant and a nitrogen production plant. A plurality of first gas calorific value measuring devices installed in the tank apart from each other,
The gas calorie fluctuation suppressing device according to any one of claims 2 to 13, wherein the calorific value distribution of the gas in the tank can be measured by the first gas calorific value measuring device.   A control device that detects the distribution of gas calorie values in the tank based on the measurement value of the first gas calorific value measurement device and controls to change the gas inflow direction into the tank according to the distribution of gas calorie values. The gas calorie fluctuation suppressing device according to claim 14 comprising. An inlet gas calorific value measuring device for measuring a gas calorific value on the inlet side, installed in a fuel gas supply passage communicating with the gas inlet;
The outlet gas calorific value measuring device for measuring the gas calorie value on the outlet side installed in the fuel gas supply passage communicated with the gas outlet is described in any one of claims 2 to 15. Gas calorie fluctuation suppression device.   Based on the measured values of the inlet gas calorific value measuring device and the outlet gas calorific value measuring device, the calorie fluctuation of the inflow gas into the tank and the calorie fluctuation of the exhaust gas from the tank are compared, and based on this comparison result, 17. The gas calorie fluctuation suppressing device according to claim 16, further comprising a control device that controls the gas inflow direction into the tank. The ceiling of the tank is configured to move up and down,
The gas calorie fluctuation suppression according to any one of claims 2 to 17, further comprising a control device that controls to change a gas inflow direction into the tank based on a direction and a distance of the vertical movement of the ceiling. apparatus.   The gas calorie fluctuation suppressing device according to claim 1 or 2, wherein the gas outlet is formed at a position deviating from an extension line of the central axis of the gas inlet.   The gas calorie fluctuation suppressing device according to any one of claims 1 to 19, wherein a stirring device for stirring gas is installed inside the tank. A fuel gas supply passage for supplying fuel gas as fuel gas to the combustion facility;
A gas calorie suppression device for suppressing fluctuations in the calorific value of the fuel gas supplied through the low calorie supply passage,
A fuel gas supply facility, wherein the gas calorie suppression device is the gas calorie fluctuation suppression device according to any one of claims 1 to 20. In the gas calorie suppression device,
An outlet passage connected between the gas outlet of the tank and the fuel gas supply passage;
An inlet passage connected between one of the upstream side and the downstream side from the connection point of the outlet passage in the gas inlet of the tank and the fuel gas supply passage;
The fuel gas supply equipment according to claim 21, further comprising a gas pressure feeding device disposed in the inlet passage and pumping the fuel gas toward the tank. In the gas calorie suppression device,
An outlet passage connected between the gas outlet of the tank and the fuel gas supply passage;
An inlet passage connected between both the upstream side and the downstream side of the connection point of the outlet passage in the gas inlet of the tank and the fuel gas supply passage;
The fuel gas supply equipment according to claim 21, further comprising a gas pressure feeding device installed in each inlet passage to pump fuel gas toward the tank. In the gas calorie suppression device,
An outlet passage connected between the gas outlet of the tank and the fuel gas supply passage;
An inlet passage connected between the gas inlet of the tank and the upstream side of the connection point of the outlet passage in the fuel gas supply passage;
A return passage connected between the downstream side and the upstream side of the connection point of the outlet passage in the fuel gas supply passage;
The fuel gas supply facility according to claim 21, further comprising a gas pumping device installed in each of the inlet passage and the return passage and pumping the fuel gas toward the tank and the upstream fuel gas supply passage. In the gas calorie suppression device,
A fuel gas supply passage on the downstream side is connected to the gas outlet of the tank,
An upstream fuel gas supply passage is connected to one gas inlet of the tank,
A return passage connected between the other gas inlet of the tank and the downstream fuel gas supply passage;
The fuel gas supply equipment according to claim 21, further comprising a gas pumping device installed in the return passage to pump fuel gas toward the tank. In the gas calorie suppression device,
A fuel gas supply passage on the downstream side is connected to the gas outlet of the tank,
An upstream fuel gas supply passage is connected to one gas inlet of the tank,
A return passage connected between the fuel gas supply passage upstream of the tank and the fuel gas supply passage downstream of the tank;
The fuel gas supply equipment according to claim 21, further comprising a gas pressure supply device installed in the return passage and for pressure-feeding the fuel gas from the downstream side to the upstream side of the fuel gas supply passage. The above combustion equipment;
A fuel gas supply facility for supplying fuel gas as fuel gas to the combustion facility,
The combustion facility is a gas turbine,
27. A gas turbine facility, wherein the fuel gas supply facility is the fuel gas supply facility according to any one of claims 21 to 26. The above combustion equipment;
A fuel gas supply facility for supplying fuel gas as fuel gas to the combustion facility,
The combustion facility is a boiler that burns gas with a burner,
A boiler facility, wherein the fuel gas supply facility is the fuel gas supply facility according to any one of claims 21 to 26.

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