CN100593672C

CN100593672C - Gas turbine device, device for supplying fuel gas and method for suppressing calorie elevation of fuel gas

Info

Publication number: CN100593672C
Application number: CN200580047093A
Authority: CN
Inventors: 佐香正明; 大田秀明
Original assignee: Kawasaki Jukogyo KK
Current assignee: Kawasaki Motors Ltd
Priority date: 2005-01-26
Filing date: 2005-01-26
Publication date: 2010-03-10
Anticipated expiration: 2025-01-26
Also published as: TW200626795A; CN101107477A; TWI280318B; WO2006080057A1; JP4611373B2; BRPI0517588A; JPWO2006080057A1

Abstract

The invention can provide a gas supply device with a low heat generation, which can inhibit the heat generation run-up of the fuel gas. The gas supply device with a low heat generation has a gas supply pipe with a low heat generation which supplies the gas as fuel to a gas turbine, a waste nitrogen supply device connected to the fuel gas supply pipe for supplying the waste nitrogen generated by atleast one of the oxygen generator and the nitrogen generator to the waste nitrogen supply pipe of the gas supply pipe with a low heat generation, a calorimeter equipped with the gas supply pipe witha low heat generation for detecting the heat generation in the gas and a control apparatus. The control apparatus controls to apply the waste nitrogen from the waste nitrogen supply pipe when the detection value of the calorimeter exceeds the reference.

Description

The method for suppressing calorie elevation of gas-turbine plant, fuel gas supply equipment and fuel gas

Technical field

The present invention relates to the method for suppressing calorie elevation of gas-turbine plant, fuel gas supply equipment and fuel gas.In more detail, relate to fuel gas supply equipment that its caloric value as lower calorific value gas (be also referred to as calorie) is had the gas of change to act as a fuel to offer gas turbine, possess the gas-turbine plant of this fuel gas supply equipment and suppress the method that this gas turbine fuel rises with the caloric value of gas.

Background technology

Utilize blast furnace process for example to produce under the situation of the pig iron in the ironmaking field, produce blast furnace gas (Blast Furnace Gas is hereinafter to be referred as BFG) as bi-product gas from blast furnace.The gross calorific power of BFG even reach caloric value only about half of of the coke of use is therefore in order to reduce ironmaking cost, many-sided BFG that uses in iron-smelter.3000Nm takes place in 1 ton of coke of every input ³About BFG, its composition is carbon dioxide (CO ₂) 10～18 volume % (the following % that simply is expressed as), carbon monoxide (CO) 22～30%, nitrogen (N ₂) 52～60%, hydrogen (H ₂) 0.5～4%, methane (CH ₄) about 0.5～3%.

In addition, BFG also comprises flue dust 2～10g/Nm ³, therefore it is being removed to 0.01g/Nm with deduster ³About after, be 800kcal/Nm as caloric value ³About fuel be used in hot-blast stove, coke oven, heating furnace, boiler etc.In recent years, also owing to the raising of its technology, the lower calorific value gas that can burn uses the example that generates electricity increasing as gas turbine fuel BFG always in gas turbine.Lower calorific value gas is defined as its caloric value at about 12MJ/Nm here, ³Following gas.Lower calorific value gas is not limited to blast furnace gas (BFG), also comprises the gas and the mist thereof of converter gas multiple other kinds such as (LDG).

On the other hand, studying blast furnace process new iron-smelting process (for example direct reduction iron making such as FINEX and COREX) in addition in recent years, can be applicable to that the developmental research of the combustion system that the bi-product gas of such new technology generation is effectively utilized has pending.The characteristic (gas composition and caloric value) of the bi-product gas that any iron-smelting process takes place is all different with content of operation because of equipment, even use same equipment, characteristic also can be corresponding to each Material Characteristics and course of reaction and is at every moment changed, and is not certain.

For the most important characteristic caloric value under the situation that bi-product gas is used as the fuel of gas turbine, under the situation of the upper limit (pact+10% of the value that for example on average generates heat) that surpasses the intrinsic caloric value permission amplitude of fluctuation of each gas turbine, just under the caloric value situation that sharply change is big, sometimes the ignition temperature in the burner of gas turbine sharply rises to abnormal high temperature.Owing to such reason burner part, the stator vane (stator blade) and the moving blade (movable vane) of gas turbine can sustain damage, may cause shortening and other drawbacks in service life, it is difficult making gas-turbine plant cause economy, move continuously in this case.

In order to suppress the caloric value change of bi-product gas, known have a technology (reference example such as patent documentation 1 and patent documentation 2) of utilizing the pure nitrogen gas dilution.But be refined in utilization under the situation of inactive gas such as highly purified nitrogen dilution bi-product gas, have to use in a large number expensive inactive gas such as nitrogen according to caloric value change value.And the supply of guaranteeing inactive gas continuously in a large number is very difficult except the special industry field.But also the bunkerage of a large amount of inactive gas must further be set and comprise the various machinery equipments etc. of the gas supply usefulness of pipe arrangement.Because these reasons make the technical scheme of buying pure inactive gas use cause the economy of gas turbine power generation to descend, and brag about the superiority of high efficiency gas turbine technology to be affected.

Patent documentation 1: TOHKEMY 2002-155762 communique

Patent documentation 2: Japanese kokai publication hei 9-317499 communique

Summary of the invention

The present invention makes for solving such existing problems, its purpose is, provide equipment cost and operating cost cheap, can relax the caloric value change of the fuel gas that gas turbine uses fuel gas supply equipment, possess the gas-turbine plant of this fuel gas supply equipment and suppress the method that gas turbine fuel rises with the caloric value of gas.

To achieve these goals, fuel gas supply equipment of the present invention possesses gas acted as a fuel and offers the fuel gas supply path that gas turbine is used, connect on this fuel gas supply path, the discarded nitrogen that at least one side in the oxygen generating plant and the equipment of making nitrogen is taken place offers the discarded nitrogen supply passageway that the fuel gas supply path is used, on described fuel gas supply path, set, detect the caloric value checkout gear that the caloric value in the gas is used, and can discard the control device of the discarded nitrogen supply action of nitrogen supply passageway according to the testing result control of this caloric value checkout gear.

If adopt this invention, then as the discarded nitrogen of the byproduct generation that should discard at oxygen generating plant and the diluent gas use that can reclaim the gas that acts as a fuel at the discarded nitrogen that contains micro amount of oxygen so go out of use of equipment of making nitrogen manufacturing.Owing to will contain the nitrogen that can not burn in a large number and be to obtain extremely easily and cheap discarded nitrogen mixed diluting fuel gas in addition, the caloric value that can suppress fuel gas rises.Here, so-called caloric value checkout gear also comprises the device that the caloric value of gas is directly measured certainly, and comprises the device of the containing ratio of the combustible component in the measurement gas.

Can also possess and to discard the control device of the discarded nitrogen supply action of nitrogen supply passageway according to the testing result control of described caloric value checkout gear.

Forming described control device can set the maximum of the gas that offers gas turbine of acting as a fuel and allow the heating value, when the heating value of fuel gas surpasses this maximum permission caloric value setting value, can provide the structure of discarded nitrogen from discarded nitrogen supply passageway.

Preferably fuel gas supply equipment forms structure as described below, be the inactive gas supply passageway that connection provides inactive gas to use on the described fuel gas supply path, described control device is formed on the discarded nitrogen supply passageway of utilization provides the state of discarded nitrogen can control the structure of the inactive gas supply action of inactive gas supply passageway down according to the testing result of caloric value checkout gear to the fuel gas supply path.If because because the supply of discarded nitrogen stops or reducing, the caloric value of fuel gas rises and can not get abundant inhibition, in this case, can utilize the diluting effect of highly purified inactive gas postcombustion gas.

Can on described discarded nitrogen supply passageway, set the cabinet of the discarded nitrogen that at least one side in the temporary transient storage oxygen generating plant and the equipment of making nitrogen provides.This is in order to keep the stable supply of discarded nitrogen

Preferably suppress container in the oxygen concentration change that on described discarded nitrogen supply passageway, sets the discarded nitrogen that at least one side in the temporary transient storage oxygen generating plant and the equipment of making nitrogen provides, this oxygen concentration change suppresses to form on the container gas access and gas vent, the upstream side that connects discarded nitrogen supply passageway on the gas access connects the downstream of discarding the nitrogen supply passageway on the gas vent.Because the discarded nitrogen that the oxygen concentration change takes place on one side to be provided changes in the inhibition container at oxygen concentration and mixes, the micro amount of oxygen concentration change homogenising of the bi-product gas composition that comprises in the discarded nitrogen, discarded nitrogen has had stability as the security of diluent gas.

In the above each equipment, preferably on described fuel gas supply path, set the container of temporary transient storage fuel gas, this container has gas access and gas vent, the upstream side that connects the fuel gas supply path on the gas access, the downstream of connection fuel gas supply path on the gas vent.Because the fuel gas that provides by the fuel gas supply path temporarily is stored in the container, by mixing therein, reduce its caloric value amplitude of fluctuation, and caloric value change speed also obtains relaxing, and therefore utilizes nitrogen to dilute control at the container downstream portion caloric value tranquilization is more prone to.Above-mentioned caloric value checkout gear is arranged on the fuel gas supply path, but on the fuel gas supply path, be provided with in the equipment of container, therefore these containers also constitute the fuel gas supply path, the caloric value checkout gear are arranged at thing such on the fuel gas supply path and are also included within on the described container and are provided with.

Form two kinds of gas accesses on the said vesse, the upstream side that wherein connects above-mentioned fuel gas supply path on the gas access, connect the return path that is connected with the downstream of fuel gas supply path on another gas access, can be provided with on this return path the gas force feed device of fuel gas to the container force feed.

Between the fuel gas supply path in the fuel gas supply path of said vesse upstream side and container downstream, be connected return path, on this return path, be provided with the gas force feed device of fuel gas to the fuel gas supply path force feed of container upstream side.

Preferably described fuel gas supply equipment sets the container of temporary transient storage fuel gas on described fuel gas supply path, between fuel gas supply path and described container, set and make fuel gas return the exit passageway of fuel gas supply path and the upstream side entry of fuel gas being sent into container from the upstream side of the tie point that is connected with exit passageway of fuel gas supply path from container.Because utilize also mixed fuel gas therein of this container, thereby can reduce its caloric value amplitude of fluctuation, and can slow down caloric value change speed.

Also have, said vesse can be the constant machine made container of internal capacity, also can be the container of the internal capacity changeable of device (gas storage holder) use of the equilibrium of supply and demand of conduct supervision gas in the existing gas-turbine plant.The container of so-called internal capacity changeable, be container, make by means of drive unit and cover member and move up and down on one's own initiative and can realize maximum counterbalance effect, the container of optional constant volume device volume etc. with lid member that can move up and down corresponding to container internal pressure of airtight installation.

Again can be to this fuel gas supply equipment, replace above-mentioned upstream side entry or be provided with simultaneously from described fuel gas supply path and tie point exit passageway downstream to the downstream of container transport fuel gas entry, on this downstream entry, set gas force feed device to container force feed fuel gas with above-mentioned upstream side entry.

In having the fuel gas supply equipment of said vesse, can between the upstream side of the downstream of described fuel gas supply path and tie point exit passageway and the fuel gas supply path and tie point entry, be connected return path, the gas force feed device of side fuel gas supply path force feed fuel gas upstream is set on this return path.

The agitating device of blender gas body and function preferably is set at described internal tank.

Preferably also possess the return path that between the upstream portion of described fuel gas supply path and downstream part, is connected, on this return path, set the gas force feed device of the part of the fuel gas that upstream flows through the part force feed fuel gas supply path from the downstream part of fuel gas supply path.Because can realize the effect identical with the effect of said vesse.

The fuel gas supply equipment that gas-turbine plant of the present invention possesses gas turbine and provides the gas that acts as a fuel to use to this gas turbine, this fuel gas supply equipment is arbitrary fuel gas supply equipment recited above.

The gas turbine fuel of the present invention method for suppressing calorie elevation of fuel gas, comprise the gas that measuring acts as a fuel offers gas turbine caloric value the measurement of calorific value step and when this measurement result surpasses the permission heating value of setting, the discarded nitrogen that the discarded nitrogen of at least one side generation in the oxygen generating plant and the equipment of making nitrogen is mixed in the above-mentioned fuel gas is sneaked into step.

And preferably described method for suppressing calorie elevation also possesses and utilizes discarded nitrogen feedway, being judged as described measurement of calorific value result when being not less than the permission heating value of setting, adds the step that inactive gas is mixed in fuel gas.

If employing the present invention, the equipment that then will offer gas turbine as the fuel gas of the meeting of caloric value as the gas of process byproducts change can be realized with cheap equipment cost and operating cost.Because for example will be as lower calorific value gas caloric value can change gas act as a fuel when providing, for the caloric value that suppresses this gas rises, obtain a large amount of so non-flammable discarded nitrogen of its gas componant almost exclusively nitrogen gas easily.

Description of drawings

Fig. 1 is the pipe arrangement skeleton diagram of gas turbine power generating plant that comprises the lower calorific value gas feeding apparatus of the present invention's one example.

Fig. 2 is the pipe arrangement skeleton diagram of gas turbine power generating plant that comprises the lower calorific value gas feeding apparatus of another example of the present invention.

Fig. 3 represents the curve map of an example of the relation between the flammability limit of lower calorific value gas and Air mixing ratio and mist, and transverse axis is the volume ratio of lower calorific value gas, and the longitudinal axis is represented temperature.

Fig. 4 is the buffer container of expression by Fig. 1 or Fig. 2, thereby the caloric value of lower calorific value gas changes the curve map of an example of the state that obtains relaxing.

Fig. 5 is that buffer container is passed through in expression, thereby the caloric value of lower calorific value gas changes the curve map of another example of the state that obtains relaxing.

Fig. 6 is that buffer container is passed through in expression, thereby the caloric value of lower calorific value gas changes the curve map of another example of the state that obtains relaxing.

Fig. 7 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Fig. 8 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Fig. 9 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Figure 10 is the buffer container of expression by Fig. 8 or Fig. 9, thereby the caloric value of lower calorific value gas changes the curve map of an example of the state that obtains relaxing.

Figure 11 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Figure 12 is the piping diagram of another example of the caloric value change inhibition means that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Figure 13 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Figure 14 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Figure 15 is the piping diagram of another example of the buffer container that can be provided with in the gas turbine power generating plant of presentation graphs 1 or Fig. 2.

Symbol description

1 lower calorific value gas feeding apparatus

2 gas turbines

3 lower calorific value gas supplying tubing

4 discarded nitrogen supplying tubing

5 blenders

6 dust collect plants

7 caloric value meters

8 flowmeters

9 mist supplying tubing

10 buffer containers

11 caloric value meters

12 oxymeters

13 low pressure compressors

14 high pressure compressors

15 coolers

16 burners

17 flow rate regulating valves

18 filters

19 generators

20 (discarded nitrogen) supply source

21 nitrogen hold-up vessels

The change of 22 (discarded nitrogen) oxygen suppresses container

23 oxymeters

24 fans

25 check valves

26 stop valves

27 flowmeters

28 flow rate regulating valves

29 stop valves

30 check valves

31 discarded nitrogen discharge pipings

32 flow rate regulating valves

33 lower calorific value gas feeding apparatus

34 inactive gas supplying tubing

35 stop valves

36 flowmeters

37 flow rate regulating valves

38 public pipe arrangements

39 fans

40 gas flow balance monitoring devices

41 communicating pipes

42 containers

43 lid members

44 adjustment weights

45 upstream sides inlet pipe arrangement

46 gas flow balance monitoring devices

47 containers

48 pressure-detecting devices

49 return pipe arrangement

50 downstreams inlet pipe arrangement

51 agitating devices

52 return pipe arrangement

100 control device

S direct reduction iron making equipment

The specific embodiment

Example to the method for suppressing calorie elevation of fuel gas supply equipment of the present invention, the gas-turbine plant that possesses this equipment and fuel gas describes with reference to the accompanying drawings.

Fig. 1 is the pipe arrangement skeleton diagram of gas-turbine plant of lower calorific value gas feeding apparatus 1 that comprises an example of fuel gas supply equipment of the present invention.As gas-turbine plant, be example here with the gas turbine power generating plant.As mentioned above, lower calorific value gas is defined as its caloric value at 12MJ/Nm ³Following gas.Lower calorific value gas great majority are the gas that characteristics such as its caloric value have change.

This lower calorific value gas feeding apparatus 1, possess the bi-product gas (hereinafter referred to as lower calorific value gas) that direct reduction iron making equipment S is taken place act as a fuel the lower calorific value gas supplying tubing 3 that offers gas turbine 2, for the caloric value that suppresses this lower calorific value gas rises, discarded nitrogen is offered the discarded nitrogen supplying tubing 4 of lower calorific value gas supplying tubing 3 usefulness and the control device 100 of controlling the action usefulness of this lower calorific value gas feeding apparatus 1 as diluent gas.

For with the lower calorific value gas dilution, suppress its caloric value and rise, the reason of mixing discarded nitrogen therein is to contain a large amount of nitrogen (N in the discarded nitrogen ₂), and do not contain imflammable gas.Discarded nitrogen is oxygen generating plant that direct reduction iron makings such as blast furnace process and FINEX method and COREX method the use nitrogen of emitting and the nitrogen that contains trace oxygen of discharging with the oxygen generating plant and the equipment of making nitrogen established.Under the situation of direct reduction iron makings such as FINEX method and COREX method, use oxygen as reducing agent, therefore the oxygen generating plant of a large amount of manufacturing oxygen must be set.In blast furnace process,, also to use oxygen generating plant, though difference is arranged on the scale owing to use oxygen.Oxygen generating plant is the construction equipment that separation of nitrogen is made oxygen from air, and the nitrogen behind the oxygen separation is put into atmosphere as discarded nitrogen usually.On the other hand, also often with oxygen generating plant and make nitrogen equipment and make high-purity nitrogen, immediately in this case, the nitrogen that also will contain trace oxygen is discharged into the atmosphere as discarded nitrogen.Discarded nitrogen like this contains about nitrogen of about 95～98%, and contain oxygen about 2～5%, and consider from the viewpoint of the flammability limit of lower calorific value gas, also be the diluent gas of extremely safe, reclaim these in a large number discarded nitrogen and use, make running cost become extremely cheap.

Part in ratio blender 5 upstreams of above-mentioned lower calorific value gas supplying tubing 3 is provided with the lower calorific value gas that direct reduction iron making equipment S is sent here and carries out the dust collect plant 6 that dedusting uses and temporarily store the buffer container 10 that lower calorific value gas is used.In this buffer container 10, form inlet 10a that connects upstream side lower calorific value gas supplying tubing 3 and the outlet 10b that connects downstream lower calorific value gas supplying tubing 3.In the buffer container 10 of Fig. 1, this inlet 10a and outlet 10b are formed near the lower end of container circumferential wall, but are not particularly limited in these positions.For example, also can be formed at middle part, the top of container circumferential wall, bottom of container etc.

Buffer container 10 has bigger capacity, the lower calorific value gas under the internal mix of this buffer container 10 the caloric value change at every moment takes place and is detained.Its effect will be narrated below.The caloric value checkout gear 7 that the caloric value that detects lower calorific value gas uses is set in the downstream of buffer container 10 and measures the flowmeter 8 that flow is used.This flowmeter 8 the upstream side that the position is not limited to blender 5 is set.Also can be provided with in the downstream of blender 5.For example, also can be arranged between following high pressure compressor 14 and the burner 16.

Caloric value checkout gear 7 the downstream that the position is not limited to buffer container 10 is set, for example, also can be the upstream side of buffer container 10.The caloric value that detects gas owing to the upstream side at buffer container 10 in advance changes, and can use blender 5 to carry out caloric value control more reliablely.And with the upstream side of buffer container 10, the caloric value checkout gear also is set in the downstream, utilize the caloric value checkout gear to monitor that the heat release in gas region change of buffer container 10 suppresses effect, can hold the combination property of the caloric value change inhibition system of the gas immixture of utilizing buffer container 10 simultaneously like this.This caloric value checkout gear also can directly be installed on the buffer container 10.The above-mentioned caloric value checkout gear 7 on lower calorific value gas supplying tubing 3, also other caloric value checkout gear can be installed in addition on buffer container 10.

Here, caloric value checkout gear 7 use direct measurement gas caloric value so-called caloric value meter (calorimeter), measure the device etc. of the content (concentration) of combustible component.Under the situation of paying attention to detection speed, under present situation, preferably use combustible gas detector.Also the kind of the combustible component that can mainly comprise according to the lower calorific value gas that is used and combustible component (for example, the carbon monoxide in the bi-product gas of direct reduction iron making) that main concentration change takes place use the concentration detector of the concentration that detects this composition.In this manual, these caloric value checkout gears are called the caloric value meter.

Because lower calorific value gas mixes with discarded nitrogen by the blender 5 downstream parts of lower calorific value gas supplying tubing 3, and is sent to gas turbine 2 with this admixture, therefore the pipe arrangement with this downstream part scope is called mist supplying tubing 9.Caloric value meter 11 is set on the mist supplying tubing 9 and the oxygen concentration in the mist is carried out measuring oxymeter 12.The downstream of oxymeter 12 is provided with the low-pressure fuel gas compressor (hereinafter referred to as low pressure compressor) 13 and the high-pressure fuel gas gas compressor (hereinafter referred to as high pressure compressor) 14 of gas turbine 2 in regular turn.Between two

compressors

13,14, set the cooling agent 15 that the mist of the gas that acts as a fuel is cooled off usefulness.Be connected to fuel distribution tube 9a on the burner 16 of gas turbine 2 from high pressure compressor 14 flow rate regulating valve 17 that usefulness is adjusted in to gas turbine output is set.Symbol 18 expressions provide the filter that is provided with on the pipe arrangement of discarded nitrogen to burner 16.Connect generator 19 on the gas turbine 2.

Fig. 1 represents to utilize gas turbine 2 to be rotated the situation of driving together with two

compressors

13,14, but is not limited to this, and two

compressors

13,14 also can not form the structure of utilizing definite-purpose motor to drive with 2 coaxial connections of gas turbine.

Supply arrangement to discarded nitrogen describes below.Discarded nitrogen supplying tubing 4 is set to extend to above-mentioned blender 5 from the oxygen generating plant (or equipment of making nitrogen) 20 as the supply source of discarding nitrogen.Should set nitrogen hold-up vessel 21 and oxygen concentration change inhibition container 22 on the discarded nitrogen supplying tubing 4.These two

containers

21,22, which is disposed at upstream side (downstream) can.

The purpose that is provided with of nitrogen hold-up vessel 21 is, the temporary transient discarded nitrogen of storing from source of supply 20 is so that the discarded nitrogen supply (NS) that comes at source of supply stops suddenly or also can continue to provide discarded nitrogen at official hour during emergency such as minimizing significantly.And can relax the pressure oscillation of discarding in the nitrogen supplying tubing 4.Should can only utilize a communicating pipe to be connected by discarded nitrogen hold-up vessel 21, also can form entrance and exit, it was connected to the upstream side and the downstream of discarded nitrogen supplying tubing 4 with discarded nitrogen supplying tubing 4.

It is to be provided with in order to suppress the oxygen concentration change in the discarded nitrogen that the oxygen concentration change suppresses container 22.If the negligible words of the change of oxygen concentration then needn't be provided with this oxygen concentration change and suppress container 22.This oxygen concentration change suppresses container 22 and forms inlet 22a and outlet 22b, and inlet 22a and outlet 22b utilize inlet pipe arrangement and outlet pipe arrangement to be connected on the discarded nitrogen supplying tubing 4 respectively.Utilize such structure, make the whole discarded nitrogen that utilizes discarded nitrogen supplying tubing 4 to provide flow into oxygen concentration variation suppressing 22 and mix.Consequently, even in the discarded nitrogen that is provided there be under the situation of change oxygen concentration, suppress the amplitude of fluctuation of the oxygen concentration of the discarded nitrogen that the outlet 22b of container 22 comes out from oxygen concentration change and also dwindle, change speed descends.That is to say that the change of oxygen concentration is relaxed (being suppressed) greatly.In case oxygen concentration obtains relaxing like this, discarded nitrogen just can access stable performance as the security of diluent gas.

Also such oxygen concentration change can be suppressed container 22 and be also used as nitrogen hold-up vessel 21.In this case, the nitrogen hold-up vessel 21 among the figure needn't be set, the oxygen concentration change only be set suppress container 22.

The downstream that suppresses container 22 in the oxygen concentration change, for the convenience of maintaining, discarded nitrogen supplying tubing 4 bifurcateds are 2, setting attracts discarded nitrogen to fuel gas supply pipe arrangement 3 from supply source 20, and the gas force feed device of using with described discarded nitrogen by discarded nitrogen supplying tubing 4 force feeds is a fan 24.When the discarded nitrogen gas pressure when supply source 20 takes place is enough high, do not need this fan 24.

In the downstream of each fan 24, in order to prevent to set check valve 25 to fan 24 1 side reverse flows.It is 1 that discarded nitrogen supplying tubing 4 is converged once again in the downstream of two check valves 25, the part of the discarded nitrogen supplying tubing 4 in this point downstream, stop valve 26, flowmeter 27, flow rate regulating valve 28, oxymeter 23, stop valve 29 and check valve 30 are set, and finally discarded nitrogen supplying tubing 4 is connected in blender 5.The position that is provided with of this oxymeter 23 is not defined in the position shown in the accompanying drawing especially, can be arranged at the optional position on the discarded nitrogen supplying tubing 4.Caloric value change at lower calorific value gas suppresses to use this oxymeter 23 in the control, there is no need to use in this control the oxymeter 12 of above-mentioned mist supplying tubing 9.Above-mentioned check valve 30 is to be used to prevent the valve of lower calorific value gas to discarded nitrogen supplying tubing 4 reverse flows.Above-mentioned nitrogen hold-up vessel 21 and oxygen concentration change suppress container 22 and are arranged at respectively between check valve 25 and the stop valve 26.

Between the above-mentioned stop valve 26 and flowmeter 27 of discarded nitrogen supplying tubing 4, set discarded nitrogen is discharged usefulness in atmosphere discarded nitrogen and emit pipe arrangement 31.This discarded nitrogen is emitted flow rate regulating valve 32 is set on the pipe arrangement 31.

The example that 100 pairs of these equipment of control device are controlled describes below.At first, Yi Bian monitor the caloric value meter 7 and flowmeter 8 of lower calorific value gas supplying tubing 3, Yi Bian lower calorific value gas is sent to gas turbine 2.At this moment, opened this stop valve 26 in discarded nitrogen supplying tubing 4, closed flow rate regulating valve 28, emitted under the state that the flow rate regulating valve 32 of pipe arrangement 31 opens will discarding nitrogen, fan 24 carries out work.That is to say, after discarded nitrogen is attracted, emits pipe arrangement 31 from discarded nitrogen and be released to the atmosphere.Other stop valves 29 are opened.

Set the permission caloric value scope of the fuel gas of each gas turbine 2 use at control device 100.The value of benchmark heating just (for example, 1600kcal/Nm ³) and amplitude of fluctuation (for example, benchmark heating value ± 10%).And open the flow rate regulating valve 28 of discarded nitrogen supplying tubing 4, to discard the flow rate regulating valve 32 of nitrogen pipe arrangement 31 to closing the adjustment of valve direction, make the heating value of above-mentioned lower calorific value gas be no more than this permission change upper limit heating value (for example ,+10%, 1760kcal/Nm ³).By means of this, will discard nitrogen and be mixed in the lower calorific value gas, control makes the heating value in allowed band.Supply with when discarding nitrogen and the following N of supply ₂The time, with the supervision of above-mentioned caloric value meter 7 and flowmeter 8 simultaneously, whether appropriate in order to judge final heating value, the caloric value meter 11 of mist supplying tubing 9 is monitored.When discarded nitrogen is provided, as described below, utilize the oxymeter 23 of discarded nitrogen supplying tubing 4, monitor the oxygen concentration of the discarded nitrogen of supplying with, perhaps utilize the oxymeter 12 of lower calorific value gas supplying tubing 3 to monitor the oxygen concentration of discarded nitrogen through mixed fuel gas.

To emitting pipe arrangement 31 by discarded nitrogen from discarded nitrogen supplying tubing 4, the structure that discarded nitrogen is emitted in atmosphere describes below.The quantity delivered of discarded nitrogen is utilized flow rate regulating valve 28 controls usually.Detected value at the caloric value meter 7 of lower calorific value gas supplying tubing 3 sharply reduces under the situation of (the heating value of lower calorific value gas sharply reduces), and when utilizing this flow rate regulating valve 28 to control, its respective performances might be a problem.Under these circumstances, emit the flow rate regulating valve 32 of pipe arrangement 31, a part of discarding nitrogen is released in the atmosphere, the supply of discarded nitrogen is sharply reduced by opening discarded nitrogen, corresponding with the rapid minimizing of heating value.

Fig. 2 represents the different shape of lower calorific value gas feeding apparatus.This lower calorific value gas feeding apparatus 33 is set up the supply arrangement of inactive gas on the lower calorific value gas feeding apparatus 1 of Fig. 1.Its lower calorific value gas feeding apparatus 1 with Fig. 1 is identical, therefore, is marked with same-sign and omits its explanation on same equipment.The inactive gas supplying tubing 34 that provides the high-purity inactive gas to use to lower calorific value gas supplying tubing 3 is provided the inactive gas supply arrangement of Fig. 2.At this moment for as the oxygen generating plant (equipment of making nitrogen) 20 of above-mentioned discarded nitrogen supply source for a certain reason and out of service, or discarded nitrogen generating capacity is when reducing significantly, and can stablize provides diluent gas setting.Use nitrogen as inactive gas in this example, therefore this inactive gas supplying tubing is called nitrogen supplying tubing 34.Inactive gas is not limited to nitrogen, also can use carbon monoxide or helium etc.

In this example, nitrogen supplying tubing 34 is connected in discarded nitrogen supplying tubing 4, connects the public pipe arrangement 38 of discarded nitrogen and nitrogen on lower calorific value gas supplying tubing 3.This public pipe arrangement 38 is connected in lower calorific value gas supplying tubing 3 by means of blender 5.Consideration when offering lower calorific value gas supplying tubing 3 after discarded nitrogen mixes, also can be provided for blender that two kinds of gases are mixed at the nitrogen supplying tubing 34 and the connecting portion of discarded nitrogen supplying tubing 4 with this inactive gas.

Also can not make discarded nitrogen supplying tubing 4 and nitrogen supplying tubing 34 interflow just respectively pipe arrangement 4 and pipe arrangement 34 are directly connected in blender 5, still,, preferably as shown in the figure pipe arrangement 4 is connected in advance with pipe arrangement 34 in order to reduce equipment cost.Above-mentioned nitrogen supplying tubing 34 possesses stop valve 35, flowmeter 36 and flow rate regulating valve 37 in regular turn from upstream side.On the above-mentioned public pipe arrangement 38, the same with the discarded nitrogen supplying tubing 4 of the lower calorific value gas feeding apparatus 1 of Fig. 1, from upstream side stop valve 29 and check valve 30 are set in regular turn.

Control device 100 is according to the measurement result of the caloric value meter 11 of mist supplying tubing 9, utilize discarded nitrogen to supply with in the time of to maintain the heating value in the allowed band even be judged to be, flowmeter 36 to nitrogen supplying tubing 34 monitors on one side, open flow rate regulating valve 37 on one side and adjust, nitrogen is blended in the control that makes the heating value include allowed band in the lower calorific value gas.

Comprise about 2～5% oxygen in the discarded nitrogen that takes place in the oxygen generating plant and the equipment of making nitrogen, be mixed in the lower calorific value gas if therefore will discard nitrogen, the oxygen content of this mist (oxygen concentration) will rise slightly.Contain in fuel gas under the situation of oxygen of regulation ratio, in theory, this fuel gas just enters flammable range under the temperature of regulation.For the situation that the discarded nitrogen that contains 2～5% oxygen of having an appointment is mixed in lower calorific value gas is studied, as long as allow mixing ratio to study according to containing the maximum of the many air of oxygen in lower calorific value gas.

That is to say, in the air owing to comprise the oxygen of certain volume than (about 21% is constant), therefore ask the flammability limit of the mist of air and lower calorific value gas with regard to the volume ratio of lower calorific value gas or air, the maximum of setting air allows mixing ratio in view of the above, and it is easily that the maximum that calculates discarded nitrogen according to these data and the ratio that contains the oxygen rate allows mixing ratio to set again.For example the maximum with air allows mixing ratio to multiply by the oxygen containing ratio (21%) of air and the ratio of the oxygen containing ratio (about 2～5%) of the discarded nitrogen that is adopted.To be described below.

Fig. 3 expresses as a reference for lower calorific value gas and the volume ratio of its flammable range of Air mixing gas and lower calorific value gas and the relation of temperature.Among the figure, the minimum volume that the curve that the black circle in left side is linked to be is represented lower calorific value gas in the flammable range of mist is than (maximum volume of air than).The maximum volume that the curve that the black tetragonal mark on right side is linked to be is represented lower calorific value gas in the flammable range of mist is than (minimum volume of air than).The scope that two curves clip is represented flammable range.Because the heating value of lower calorific value gas is variable, therefore above-mentioned two curves also can change.Therefore if based on such data, if air is considered as diluent gas, in this case, for example the maximum of air allows the mixed volume ratio, considers that the safety coefficient volume ratio is 20% (volume ratio 80% of lower calorific value gas).The minimum volume that is the air represented of curve that the black tetragonal mark than the right side is linked to be is than also little ratio (20%).But this numerical value is an example.

Here, the oxygen ratio that contains of air and discarded nitrogen is 21/5.That discards nitrogen contains oxygen ratio about 2～5%, 5% for safety.It is 20% that the maximum of air allows the mixed volume ratio, and the maximum of therefore discarded nitrogen allows the mixed volume ratio to be

In control device 100, the maximum of setting these discarded nitrogen allows the mixed volume ratio, and these are the maximum permission mixed volume ratios from the flammability limit derivation of mist.In fact the discarded nitrogen that does not mix in lower calorific value gas reaches 84% situation.

Above-mentioned control is to carry out according to the testing result of the flowmeter 27 of the flowmeter 8 of lower calorific value gas supplying tubing 3 and discarded nitrogen supplying tubing 4.And often monitor the oxygen concentration of mist and the oxygen concentration of discarded nitrogen simultaneously by means of above-mentioned oxymeter 23 (also can be 12).This is the oxygen concentration change of not expecting in order to tackle.

Action effect to the buffer container 10 of Fig. 1 or Fig. 2 describes below.As mentioned above, the lower calorific value gas of sending here all flows into this buffer container 10.The volume of this buffer container is big, for example for the lower calorific value gas supplying tubing 3 about diameter 2～3m, volume is set is generally 20000～200000m ³About container.The lower calorific value gas of the caloric value of sending here change is at every moment realized mixing in buffer container, and the gas in the container described in this specification mixes and in other words means the time difference mixing.That is to say, flow into the lower calorific value gas of buffer container 10 simultaneously, have from the part that relatively early flows out by outlet 10b to the such distribution of part that is trapped in the buffer container 10 for a long time.On the other hand, successively have new gas to flow into from inlet 10a, therefore the gas that flows in the past constantly mixes with the new gas that flows into.This situation is called as the time difference mixing.

The result that this time difference mixes is, the caloric value amplitude of fluctuation of the lower calorific value gas that comes out from the outlet 10b of buffering container 10 is dwindled, and change speed descends.That is to say that the caloric value change relaxes (being inhibited) greatly.In case caloric value change relaxes obtaining in advance like this, utilize discarded nitrogen etc. to dilute the control caloric value in the downstream and rise and just be very easy to carry out.Below with reference to Fig. 4～Fig. 9 above phenomenon is described.

The volume of the buffer container 10 of presentation graphs 1 and Fig. 2 is 200000m on Fig. 4 ³The time, caloric value has the lower calorific value gas of change with 500000Nm ³Under the situation that the speed of/hr provides, the curve of the analog result of the state of caloric value change mitigation (being inhibited).Transverse axis is represented the time (branch), and the longitudinal axis represents that the caloric value of lower calorific value gas is gas caloric value (kcal/Nm ³).Again, the curve shown in the dotted line represents to deliver to the caloric value change (initial change) of the lower calorific value gas of buffer container 10 among the figure.This is the sample of actual measurement.Represent the to postpone caloric value change (suppressing the back change) of the lower calorific value gas that comes out towards container of curve shown in the solid line.As shown in the figure, enter the caloric value of buffer container 10 lower calorific value gas before at about 1530kcal/Nm ³To about 2360kcal/Nm ³Between the change.That is to say to have mean value (1945kcal/Nm ³) the amplitude of fluctuation of pact ± 21%.According to the theoretical result of calculation from the caloric value change of the lower calorific value gas that comes out of buffering container 10, mobility scale is about 1780kcal/Nm ³To about 1960kcal/Nm ³, amplitude of fluctuation is suppressed in mean value (1870kcal/Nm ³) ± 5% in.As shown in the figure, short period composition in the variable cycle and middle periodic component also are subjected to very big inhibition.This effect has with respect to the big more significant more tendency of container for the supply flow rate buffer container of lower calorific value gas.Under the little situation of the amplitude of fluctuation of initial change, from economically, it also is effective that the volume of buffer container is done for a short time.Fig. 5 represents that the flow of lower calorific value gas still adopts 500000Nm ³/ hr, the volume of buffer container 10 adopts half of top described container, i.e. 100000m ³The time the attenuation state of caloric value change.In this case, the caloric value change also is cushioned container 10 and is suppressed at 1700kcal/Nm ³To 2040kcal/Nm ³Scope in, amplitude of fluctuation is mean value (1970kcal/Nm ³) pact ± 9%.

Fig. 6 represents that lower calorific value gas is with flow 200000Nm ³The volume of buffer container 10 adopts 50000m in the equipment of/hr supply ³The time the attenuation state of caloric value change.In this case, the caloric value change also is cushioned container 10 and is suppressed at 1740kcal/Nm ³To 2010kcal/Nm ³Scope in, amplitude of fluctuation is mean value (1875kcal/Nm ³) pact ± 7.2%.

At not shown lower calorific value gas with top described identical with flow 200000Nm ³In the equipment of/hr supply, the volume of buffer container 10 adopts half of said vesse, i.e. 25000m ³The time, amplitude of fluctuation is mean value (1875kcal/Nm ³) pact ± 12%.

Also can take measure as described below, promptly as shown in Figure 7, at lower calorific value gas with flow 200000Nm ³In the equipment that/hr provides, volume is 25000m ³ Buffer container 10 be set up in parallel two, two are used together when moving usually, have only under the deadly conditions such as periodic maintenance and action be bad, just use a container.

Like this, only possess buffer container, do not carry out the caloric value change that control initiatively just can suppress lower calorific value gas to a great extent.Consequently, in the downstream control that mixes discarded nitrogen and inactive gas is very easy to carry out.For example the caloric value amplitude of fluctuation of the fuel gas of gas turbine 2 is set under the situation of benchmark heating value (mean value) ± 10%, consistent in the downstream of buffer container for the benchmark heating value of setting on the mean value of the caloric value that makes change and the gas turbine 2, as long as possess buffer, provide discarded nitrogen to get final product in certain proportion in the downstream to the suitable volume of its specification.The supply action of discarded nitrogen needn't be considered the caloric value change conditions of lower calorific value gas.

Under extreme case, if the benchmark heating value of setting on the caloric value mean value of the change by the lower calorific value gas behind the buffer container 10 and the gas turbine 2 is consistent, discarded nitrogen supply arrangement and inactive gas supply arrangement just no longer need.Even be provided with under the situation of two equipment, also as long as under stop valve 29 closing state of the public pipe arrangement 38 of the stop valve 29 of the discarded nitrogen supplying tubing 4 of Fig. 1 and Fig. 2, make the equipment operation.Certainly, under the original little situation of the caloric value change of the lower calorific value gas that takes place, the setting of buffer container is no longer necessary, as long as just can fully tackle with discarded nitrogen supply arrangement and inactive gas supply arrangement.

Fig. 8 represents another buffer container 42.This buffer container 42 uses in existing gas-turbine plant, therefore is to monitor the container that comprises in the device 40 of gas balance.This gas balance monitoring arrangement 40 is the devices that are used for obtaining the balance of the quantity of the lower calorific value gas of sending here from upstream side and the spent gas amount that gas turbine needs.Have the load of change and gas turbine to have under the situation of change in the supply gas amount, averaging out between quantity delivered and consumption is necessary.When the exceeding one's expectations of quantity delivered surplus, be discharged into it in atmosphere or take other measures, when undersupply, the load of gas turbine is reduced or part out of service.

This gas flow balance monitoring device 40 possesses and utilizes communicating pipe 41 with the container 42 that is connected with lower calorific value gas supplying tubing 3 of its outlet 42b, with the upper end open gas-tight seal of container 42 and the lid member 43 that can set up or down in container and be configured in the adjustment usefulness weight 44 that for example covers on the member 43.Lid member 43 is by means of the balance of the living upward pressure of cutting down output in the summation of deadweight, the weight of above-mentioned weight 44 and atmospheric downward pressure and the container 42, therefore move up and down at internal tank, cover member 43 and move up and down corresponding to the variation of the balance of the quantity delivered of lower calorific value gas and consumption.On one side monitor moving up and down of this lid member 43, take gas put into measures such as atmosphere and reduction gas turbine load on one side.

The buffer container of Fig. 8 is the container that this gas flow balance monitoring device 40 is used in the inhibition of caloric value gas change.On this container 42, except above-mentioned communicating pipe 41, the upstream side that the new upstream side that connects the position that is connected with communicating pipe 41 of lower calorific value gas supplying tubing 3 is connected with the container entrance 42a pipe arrangement 45 that enters the mouth.Configuration is sent into lower calorific value gas in the fan 39 of container 42 on this upstream side inlet pipe arrangement 45.Upstream side inlet pipe arrangement 45 so utilize the PIPING DESIGN of considering the pressure loss, also can omit said fans 39 owing to utilize the upstream side that is connected in lower calorific value gas supplying tubing 3 communicating pipe 41.This enters the mouth pipe arrangement 45 too for Fig. 9 and upstream side shown in Figure 13.The part of the lower calorific value gas of supply flows into container 42 by upstream side inlet pipe arrangement 45, and lower calorific value gas obtains mixing in container 42, and the gas of equal number returns lower calorific value gas supplying tubing 3 by above-mentioned communicating pipe 41 from container 42.In this case, above-mentioned communicating pipe 41 also can be called the outlet pipe arrangement.This buffer container 42 is connected in the upstream side inlet pipe arrangement 45 of the bypass pipe arrangement that constitutes lower calorific value gas supplying tubing 3 and on communicating pipe 41, in other words, is arranged side by side with respect to lower calorific value gas supplying tubing 3.

Utilize this buffer container 42, the lower calorific value gas of sending here by upstream side inlet pipe arrangement 45 also with above-mentioned buffer container 10 in the same, in container, mix.Consequently, reduced significantly from the caloric value change of the outlet 42b lower calorific value gas of going out of buffering container 42, change speed has also reduced.That is to say that the caloric value change obtains very big mitigation (being subjected to very big inhibition).

And, for gas is stirred, agitating devices 51 such as fan are set in the inside of this container 42.This is in order to promote the mixing of internal tank gas, to suppress the caloric value change effectively with this.As the form that is provided with of agitating device 51, the consideration that can effectively mix from gas, preferably with can make gas from container outlet 42b nearby to the attitude that internal tank flows be arranged at outlet 42b near.Being provided with on the container 42 that the position is not limited to Fig. 8 of this agitating device 51 also can be arranged at and maybe can bring into play on

other containers

10,42,47 shown in the drawings on other containers that caloric value suppresses effect.Also have, preferably be arranged at the outside of container as the motor 51a of the rotational driving device of agitating device 51 etc.

Fig. 9 represents and can change other gas flow balance monitoring devices 46 that the inhibition means are used as caloric value.This gas flow balance monitoring device 46 also adopts the structure of economy, has the container 47 of the airtight sealed structure that is communicated with lower calorific value gas supplying tubing 3 by means of communicating pipe 41.Pressure-detecting device 48 is set on the container 47, often monitors the interior pressure of container 47.Control device 100 reaches the instruction that the gas consumption in the increase equipment time is just sent in upper limit zone at detected pressure, obtains the equilibrium of supply and demand of gas.Other structures are identical with said apparatus 40 (Fig. 8), and the inlet 47a of container 47 goes up and connects upstream side inlet pipe arrangement 45, and outlet 47b goes up connecting pipings outlet 47b.This container 47 also can change the inhibition means as caloric value and make full use of.

Figure 10 represents to have the lower calorific value gas of caloric value change with flow 500000Nm ³In the equipment that/hr provides, the volume of Fig. 8 or container 42 (47) shown in Figure 9 adopts 200000m ³, utilize said fans 39 with 500000Nm ³200000Nm in the flow of/hr ³The gas of/hr is sent into the state that the caloric value change under the situation of container 42 (47) relaxes.Curve among the figure shown in the dotted line is represented the caloric value change (initial change) of the lower calorific value gas that direct reduction iron making equipment S sends here.This is above-mentioned actual measurement sample.Curve shown in 2 locking wires represents that calm device 42 comes out, the analog result of the caloric value change (transition change) of the lower calorific value gas by communicating pipe 41.Curve shown in the solid line represent by communicating pipes 41 downstream the part of lower calorific value gas supplying tubing 3 reach the caloric value change (suppressing the back change) of the gas of blender 5.As mentioned above, the caloric value that enters container 42 (47) lower calorific value gas before has mean value (1945kcal/Nm ³) the amplitude of fluctuation of pact ± 21%.But, pass through the heat release in gas region change of communicating pipe 41 behind lower calorific value gas supplying tubing 3 interflow at 1960kcal/Nm from container 42 (47) ³To 2100kcal/Nm ³Scope in, amplitude of fluctuation is suppressed at mean value (1895kcal/Nm ³) pact ± 11% scope in.This numerical value is an example.

Like this, it also is possible utilizing existing device with container 42 (47) that the caloric value change of gas is suppressed.And, utilize discarded nitrogen dilution lower calorific value gas easily to carry out in the downstream.In Fig. 8 and Fig. 9, the upstream side inlet pipe arrangement 45 that lower calorific value gas is sent into container 42 (47) is connected in outlet pipe arrangement 41 upstreams of lower calorific value gas supplying tubing 3, but be not particularly limited in this structure, also can be connected in outlet pipe arrangement 41 downstreams (with reference to Figure 14).Can many pipelines be set two

pipes

41,45 together again.

Buffer container 42 shown in Figure 11 is the buffer containers 42 with identical gas flow balance monitoring device 40 usefulness shown in Figure 8.Difference is, the state of the pipe arrangement that is connected with lower calorific value gas supplying tubing 3.The pipe arrangement state of Figure 11 is the lower calorific value gas supplying tubing 3 of Fig. 8, the part removal from the connecting portion that is connected with upstream side inlet pipe arrangement 45 to the connecting portion that is connected with communicating pipe 41, and the upstream side state that fan 39 on the pipe arrangement 45 also removes that enters the mouth.That is to say, on inlet 42a, connect the lower calorific value gas supplying tubing 3 of upstream side, on outlet 42b, connect the lower calorific value gas supplying tubing 3 in downstream.In other words, buffer container illustrated in figures 1 and 2 10 is replaced with the container 42 of gas flow balance monitoring device 40 usefulness.Such pipe arrangement is transformed when existing gas flow balance monitoring device 40 dual-purposes are the heat release in gas region variation suppressing easily.

Figure 12 represents another caloric value change inhibition means, and these means are provided with on lower calorific value gas supplying tubing 3, and the upstream side that makes the part of lower calorific value gas return lower calorific value gas supplying tubing 3 is used returns pipe arrangement 49.This returns the fan 39 that the side pressure upstream of lower calorific value gas is sent is set on the pipe arrangement 49.Pipe arrangement 49 formation of returning shown in the figure are the structure that many branched pipe 49a return original lower calorific value gas supplying tubing 3 then from an attraction part fork, still also can return pipe arrangement by one and constitute.Can on different a plurality of positions of lower calorific value gas supplying tubing 3, set one respectively again and return pipe arrangement.

By means of such means, lower calorific value gas mixes with the lower calorific value gas that newly provides when returning the upstream of lower calorific value gas supplying tubing 3, and the caloric value change obtains relaxing.In order to increase this effect,, strengthen and return gas flow and get final product with respect to the volume ratio of the gas flow of supply as long as will return pipe arrangement 49 lengthenings.

Figure 13 also represents the container 42 that the container with Fig. 8 is set up in parallel with respect to lower calorific value gas supplying tubing 3 equally.As shown in the figure, between container 42 and lower calorific value gas supplying tubing 3, be connected the upstream side inlet pipe arrangement 45 that possesses fan 39 and as above-mentioned communicating pipe 41 of outlet pipe arrangement, that is to say, on the inlet 42a of container 42, connect upstream side pipe arrangement 45, on outlet 45b, connect outlet pipe arrangement 41.But on this container 42, also form inlet 50a, on this inlet 50a, be connected the downstream that connects on the downstream of the connecting portion that is connected with outlet pipe arrangement 41 of lower calorific value gas supplying tubing 3 pipe arrangement 50 that enters the mouth.On the inlet pipe arrangement 50 of downstream, the fan 39 of lower calorific value gas being sent into container 42 is set.As shown in the figure, upstream side inlet pipe arrangement 45 and downstream inlet pipe arrangement 50 link position (

inlet

42a, 50a) on container 42 is approaching mutually.

If adopt this structure, then the part of lower calorific value gas is pressed to the container 42 by upstream side inlet pipe arrangement 45 from the upstream side of lower calorific value gas supplying tubing 3, the part of lower calorific value gas is pressed to container 42 from the downstream of lower calorific value gas supplying tubing 3 by downstream inlet pipe arrangement 50 simultaneously, mixes the back and flows out to communicating pipe from outlet 42b.That is to say, the part of the lower calorific value gas that the caloric value change is suppressed forms circulation, therefore can realize long-time the mixing in container, and the length of downstream inlet pipe arrangement 50 is long more, then mixed gas hold-up time is long more, can realize better mixing.Above-mentioned downstream inlet pipe arrangement 50 is connected to the inlet 50a of container 42 from the downstream of lower calorific value gas supplying tubing 3, but also can be connected to lower calorific value gas supplying tubing 3 and connecting portion upstream side upstream side inlet pipe arrangement 45 from the downstream.

Figure 14 also represents the buffer container 42 that is arranged side by side with respect to lower calorific value gas supplying tubing 3.As shown in the figure, between container 42 and lower calorific value gas supplying tubing 3, be connected above-mentioned communicating pipe 41 and downstream inlet pipe arrangement 50 as the outlet pipe arrangement.On this downstream inlet pipe arrangement 50 fan 39 of lower calorific value gas being sent into container 42 is set.

If adopt such structure, even downstream inlet pipe arrangement 50 is connected in downstream lower calorific value gas supplying tubing 3 and connecting portion communicating pipe 41, also can utilize fan 39 that lower calorific value gas is sent in the container 42 by downstream inlet pipe arrangement 50, mix the back and flow out to communicating pipe from outlet 42b.That is to say that the part of the lower calorific value gas that the caloric value change is controlled circulates, therefore realized effective mixing.And the length of above-mentioned downstream inlet pipe arrangement 50 is long more, then can realize the mixing of longer time in container.

Container 42 shown in Figure 15 has two kinds of

inlets

42a, 52a, on an inlet 42a, connect upstream side lower calorific value gas supplying tubing 3, outlet 42b go up to connect downstream lower calorific value gas supplying tubing 3, and on another inlet 52a, connect be connected with downstream lower calorific value gas supplying tubing 3 return pipe arrangement 52.Two

inlets

42a, 52a are mutually near forming.Return to be provided with on the pipe arrangement 52 lower calorific value gas is sent into the fan 39 that container is used.

If adopt such structure, the part of the lower calorific value gas that the caloric value change is suppressed in container 42 is returned container 42 once again and is realized once again mixing, and therefore can realize better mixing.Return the length of pipe arrangement 52 and do longly more, the time of the gas delay that then mixes is long more.Above-mentionedly return pipe arrangement 52 is connected to container 42 from the downstream of lower calorific value gas supplying tubing 3 inlet 52a, but also can be connected to the upstream side of the container of lower calorific value gas supplying tubing 3 from the downstream.

More than in Shuo Ming the example illustration bi-product gas that takes place with direct reduction iron making as the lower calorific value gas that uses, but be not limited to this.Lower calorific value gas also can be blast furnace gas (BFG), the coal bed gas that comprises in converter gas (LDG) coal seam (Coal mine gas is called for short CMG), the bi-product gas that melting reduction iron-smelting method takes place, GTL (Gas-to-Liquid: the gas liquefaction) tail gas that takes place in the technology, from oil-sand, follow the bi-product gas of generation in the technology of refined oil, gas with the plasma incineration waste generation, the methane gas (Landfill gas) that the place of burying the general discarded object that comprises living rubbish takes place in the fermentation decomposable process, and other similar raw material generation chemical reactions and follow the lower calorific value gases such as byproduct of generation.Certainly, not only comprise above-mentioned gas separately, also comprise as the mist of BFG and LDG multiple gases and mix, its caloric value is at about 12MJ/Nm as a result ³Following gas.

Industrial applicability

If employing the present invention utilizes the low discarded nitrogen of a large amount of existence and handy oxygen concentration to its caloric value The lower calorific value gas that at every moment changes dilutes, and can suppress the abnormal ascending of ignition temperature, makes stable Burning continue to carry out. That is to say, can utilize cheap equipment cost and operating cost to obtain above-mentioned effect. And And, the nitrogen that can effectively utilize the oxygen generating plant that in the past went out of use etc. to take place.

Claims

1. a fuel gas supply equipment is characterized in that possessing

With gas act as a fuel offer fuel gas supply path that gas turbine uses,

Connect on this fuel gas supply path, the discarded nitrogen that at least one side in the oxygen generating plant and the equipment of making nitrogen is taken place offer discarded nitrogen supply passageway that the fuel gas supply path uses,

On described fuel gas supply path, set, detect caloric value checkout gear that the caloric value in the gas uses and

Set and be communicated with, temporarily store the hold-up vessel of the discarded nitrogen that at least one side in the oxygen generating plant and the equipment of making nitrogen provides with described discarded nitrogen supply passageway.

2. fuel gas supply equipment according to claim 1 is characterized in that, also possesses to discard the control device of the discarded nitrogen supply action of nitrogen supply passageway according to the testing result control of described caloric value checkout gear.

3. fuel gas supply equipment according to claim 2, it is characterized in that, forming described control device sets the maximum of the gas that offers gas turbine of acting as a fuel and allows the heating value, when the heating value of fuel gas surpasses this maximum permission caloric value setting value, can provide the structure of discarded nitrogen from discarded nitrogen supply passageway.

4. fuel gas supply equipment according to claim 2 is characterized in that,

The inactive gas supply passageway that provides inactive gas to use is provided on the described fuel gas supply path,

Described control device is formed on the discarded nitrogen supply passageway of utilization provides the state of discarded nitrogen can control the structure of the inactive gas supply action of inactive gas supply passageway down according to the testing result of caloric value checkout gear to the fuel gas supply path.

5. fuel gas supply equipment according to claim 1 is characterized in that,

On described discarded nitrogen supply passageway, the oxygen concentration change that sets the discarded nitrogen that at least one side in the temporary transient storage oxygen generating plant and the equipment of making nitrogen provides suppresses container,

This oxygen concentration change suppresses container and has entrance and exit, connects the upstream side of discarded nitrogen supply passageway on the inlet, connects the downstream of discarded nitrogen supply passageway in the outlet.

6. fuel gas supply equipment according to claim 1 is characterized in that,

Set the container of temporary transient storage fuel gas on the described fuel gas supply path,

This container has entrance and exit, connects the upstream side of fuel gas supply path on the inlet, connects the downstream of fuel gas supply path in the outlet.

7. fuel gas supply equipment according to claim 6 is characterized in that,

Form two kinds of gas accesses on the described container,

The upstream side that wherein connects described fuel gas supply path on the gas access,

Be connected return path between the downstream of another gas access and fuel gas supply path,

Gas force feed device to container force feed fuel gas is set on this return path.

8. fuel gas supply equipment according to claim 6 is characterized in that,

Be connected return path between the fuel gas supply path of described container upstream side and the fuel gas supply path in container downstream,

Gas force feed device to the fuel gas supply path force feed fuel gas of container upstream side is set on this return path.

9. fuel gas supply equipment according to claim 1 is characterized in that,

Between fuel gas supply path and described container, set and make fuel gas return the exit passageway of fuel gas supply path and the upstream side entry of fuel gas being sent into container from the upstream side of the tie point that is connected with exit passageway of fuel gas supply path from container.

10. according to claim 1 or 9 described fuel gas supply equipment, it is characterized in that,

Between fuel gas supply path and described container, set and make fuel gas return the exit passageway of fuel gas supply path and the downstream entry of fuel gas being sent into container from the downstream of the tie point that is connected with exit passageway of fuel gas supply path from container

Set gas force feed device on this downstream entry to container force feed fuel gas.

11. fuel gas supply equipment according to claim 9 is characterized in that,

Between the upstream side of the downstream of described fuel gas supply path and tie point exit passageway and the fuel gas supply path and tie point entry, be connected return path,

The gas force feed device of side fuel gas supply path force feed fuel gas upstream is set on this return path.

12. according to claim 6 or 9 described fuel gas supply equipment, it is characterized in that, the agitating device of blender gas body and function be set at described internal tank.

13. fuel gas supply equipment according to claim 1 is characterized in that,

Also possess the return path that between the upstream portion of described fuel gas supply path and downstream part, is connected,

On this return path, set the gas force feed device of the part of the fuel gas that upstream flows through the part force feed fuel gas supply path from the downstream part of fuel gas supply path.

14. a gas-turbine plant is characterized in that,

The fuel gas supply equipment that possesses gas turbine and provide the gas that acts as a fuel to use to this gas turbine,

This fuel gas supply equipment is each the described fuel gas supply equipment in the claim 1～13.

15. the gas turbine fuel method for suppressing calorie elevation of fuel gas is characterized in that, comprises

Measurement act as a fuel the gas that offers gas turbine caloric value the measurement of calorific value step,

When the permission heating value that this measurement result surpass to be set, the discarded nitrogen that at least one side in the oxygen generating plant and the equipment of making nitrogen is taken place as the gas that dilutes usefulness be mixed in discarded nitrogen in the fuel gas sneak into step and

Should discarded nitrogen sneak into step and comprise described discarded nitrogen is sneaked into before the fuel gas, in the temporary transient step of storing of discarded nitrogen hold-up vessel.

16. method for suppressing calorie elevation according to claim 15, it is characterized in that, also possess and utilize discarded nitrogen feedway,, in fuel gas, add the step that inactive gas is mixed being judged as described measurement of calorific value result when being not less than the permission heating value of setting.