Decontamination system

Abstract

The invention relates to a gas decontamination system (1) for a test rig (80) for a gas turbine (90), this system (1) being intended to extract the pollutants present in the gas flow that is displaced by this turbomachine (90) in operation. This decontamination system (1) comprises an upstream pipe (10), the upstream end (11) of which is fluidically connected to the outlet orifice of the test rig (80), a device (20) for cleaning the gas in this upstream pipe (10), a fluid tank (30), the inlet orifice (31) of which is fluidically connected to the downstream end (12) of the upstream pipe (10), and a downstream pipe (60) which is fluidically connected to the outlet orifice (32) of the tank (30) and which opens out downstream to the atmosphere.

Description

Description Title: Decontamination System

[0001] La présente invention concerne un système de décontamination pour un gas turbine test bench, for example turbomachine.

[0002] Un tel banc d’essai comprend, de l’amont vers l’aval (dans le sens normal The air circulation system includes an intake room, a turbomachine test room, and an exhaust stack. Air enters the test room through the intake room. The test room contains a turbomachine mounted on a thrust balance. Downstream of the turbomachine being tested, within this test room, is an exhaust duct containing a tube that receives the exhaust gases escaping from the turbomachine during its test. The exhaust gases exit this tube and flow up the exhaust stack.

[0003] A cause de la combustion dans la turbomachine, les gaz qui sortent duExhaust ducts contain carbon dioxide. Furthermore, in certain configurations known as confined test benches, fine particles, sand, and corrosive gases (e.g., sulfur gas) are injected into the turbomachine to test its resistance under conditions similar to actual flight conditions in specific climates. These gases and particles are present in the stream ejected from the exhaust duct and subsequently flowing through the exhaust stack.

[0004] Ces gaz et ces particules sont des polluants, et on cherche à réduire leur release into the atmosphere. To this end, a gas treatment device for these gas streams is placed in the exhaust stack. This treatment device includes filters with materials capable of adsorbing the gas, for example carbon dioxide filters, and it also includes electrostatic precipitators capable of capturing polluting particles.

[0005] Ainsi, d’une façon générale, on connait un système de décontamination degas for a gas turbine test bench, this system being intended to extract pollutants present in the gas flow which is moved by the operating turbine.

[0006] Cependant, les dispositifs de traitement existants ne sont pas sufficiently effective to clean the gas stream exiting the gas turbine test bench. Consequently, there are emissions of pollutants, especially polluting particles and corrosive gases, which are excessive according to environmental protection standards. Description of the invention

[0007] La présente invention vise à remédier à ces inconvénients.

[0008] L'invention vise à proposer un système de dépollution pour banc d’essai of a gas turbine in which the treatment of pollutants present in the gas stream displaced by this operating gas turbine is carried out with optimal efficiency, and in the most economical way possible.

[0009] Ce but est atteint grâce au fait que le système de décontaminationincludes an upstream pipe whose upstream end is intended to be fluidly connected to the outlet port of the test bench, a gas cleaning device which is located in the upstream pipe, a fluid reservoir whose inlet port is located above the liquid (L) contained in the reservoir and is fluidly connected to the downstream end of the upstream pipe, and a downstream pipe which is fluidly connected to the outlet port of the reservoir and which opens downstream to the atmosphere.

[0010] Grâce à ces dispositions, le gaz qui sort du banc d’essai est dépollué plus Effectively. Indeed, the gas is first rid of polluting particles through a cleaning process, which removes these particles into a liquid collected in the tank. Then, the passage of the gas over and in contact with this liquid promotes the dissolution of corrosive gases within it.

[0011] Par exemple, le système de décontamination comprend une grille qui estlocated in the reservoir downstream of the part of the reservoir intended to contain the liquid and upstream of the outlet, and which is intended to collect liquid droplets

[0012] Par exemple, la grille est un dispositif de désembuage à palettes

[0013] Par exemple, le système de décontamination comprend un fournisseur of oxygen which is located in the tank and which is intended to be located below the surface (S) of the liquid (L) contained in the tank, and a reagent supplier suitable for reacting with the oxygen and corrosive molecules present in the gas.

[0014] Par exemple, le système de décontamination comprend un dispositif de recycling of the liquid contained in the reservoir, the recycling device being fluidly connected upstream to the reservoir by a first pipe and fluidly downstream to the reservoir by a second pipe.

[0015] Par exemple, le dispositif de nettoyage comprend au moins une buse de liquid spray

[0016] Par exemple, le dispositif de nettoyage est connecté fluidiquement à une pump which is fluidly connected to the reservoir and which is capable of supplying liquid to the cleaning device.

[0017] Par exemple, la canalisation aval est munie d’un ventilateur qui est apte à to circulate the gases from upstream to downstream.

[0018] L’invention concerne également un procédé de décontamination de gazfor a gas turbine test bench which is intended to extract pollutants present in the gas stream which is moved by the operating turbine.

[0019] Selon l’invention, le procédé comprend les étapes suivantes(a) A fluid reservoir, an upstream pipe, and a downstream pipe are provided, and the outlet of the test bench and the inlet of the reservoir are fluidly connected to the upstream pipe, with the inlet located above the liquid L contained in the reservoir. The outlet of the reservoir and the atmosphere are fluidly connected to the downstream pipe, such that the polluted gas from the test bench flows to the atmosphere through the upstream pipe, the reservoir, and the downstream pipe. (b) The pollutant particles present in the polluted gas are moistened using a cleaning device located in the upstream pipe to extract the particles from the polluted gas. (d) The polluted liquid is recovered from the reservoir to dissolve the corrosive gas molecules present in the gas at the interface between the gas and said polluted liquid; (e) the unpolluted gas coming from the inlet pipe is evacuated through the outlet pipe.

[0020] Par exemple, le procédé comprend une étape (c) dans laquelle on met un reactant in the contaminated liquid using a reactant supplier and such that, in step (d), oxygen is injected below the surface of the contaminated liquid in the tank using an oxygen supplier in order to create a chemical reaction between the corrosive pollutant present in the gas and the reactant and the oxygen

[0021] L'invention sera bien comprise et ses avantages apparaîtront mieux, à la Read the detailed description that follows, illustrating embodiments shown as non-limiting examples. The description refers to the attached drawings on which:

[0022] [Fig. 1] La figure 1 est une vue en perspective d’un banc d’essai de turbine gas with a pollution control system according to the invention.

[0023] [Fig. 2] La figure 2 est une vue coupe longitudinale du système de Depollution of Figure 1. Detailed description of the invention

[0024] Dans la description ci-dessous, les termes « amont » et « aval » sontdefined with respect to the normal direction of gas and air flow in the test bench, in the gas turbine, and in the exhaust duct during normal operation of the invention. "Fluidically connected" means that the connection allows the flow of a fluid (liquid or gas).

[0025] L’invention est décrite ci-dessous dans le cas où la turbine à gaz est une turbomachine, but applies to any gas turbine.

[0026] La figure 1 représente un banc d’essai 80 de turbomachine 90 selon the invention. This test bench 80 comprises a building which includes, from upstream to downstream (in the normal direction of airflow during operation of the turbomachine 90, represented by a solid arrow F), an intake room 81, a test room 82, and an exhaust stack 83. In the case of a bench In a confined test chamber, air enters the test chamber 82 through the intake chamber 81. The upstream end of the intake chamber 81 (on the left in the figure) is then closed by a door 815. Sand and / or other abrasive particles are injected into the intake chamber 81 by a first upstream injector 85 upstream of the turbomachine 90. Optionally, a corrosive gas (for example, containing sulfur) is injected by a second upstream injector 86 into the intake chamber 81. The test chamber 82 includes a turbomachine 90 which is mounted on a thrust balance 91 and is intended for testing.

[0027] Le flux de gaz déplacé par la turbomachine 90 passe par la cheminéeThe exhaust stack 83 then exits the building. For example, the exhaust stack 83 has a bend and a horizontal section, as illustrated in Figure 1. Optionally, the exhaust stack 83 includes a treatment device 84 comprising filters with materials suitable for adsorbing polluting gas in the gas stream displaced by the turbomachine 90 and / or electrostatic precipitators suitable for absorbing polluting particles. For clarity, the test bench 80 is shown with a dashed line.

[0028] On décrit maintenant le système de décontamination 1 selon l’invention,which is designed to extract pollutants present in the gas stream exiting the exhaust stack 83. These pollutants are carbonaceous particles produced by combustion in the turbomachine, polluting particles introduced into the test bench 80 such as sand, and one or more corrosive gases. The decontamination system 1 is shown in Figure 1 and also in Figure 2, which represents this decontamination system 1 in longitudinal section. In the figures, the gas flow is indicated by arrows F.

[0029] Le système de décontamination 1 comprend une canalisation amont 10whose upstream end 11 is fluidically connected to the outlet of the exhaust stack 83. The decontamination system 1 includes a fluid reservoir 30 whose inlet 31 is fluidically connected to the downstream end 12 of said upstream pipe 10. In operation, the inlet 31 is located above the surface S of the liquid L contained in the reservoir 30, knowing that the reservoir 30 also contains the gas circulating above this liquid L. The decontamination system 1 includes a downstream pipe 60 which is fluidically connected to the outlet 32 ​​of the reservoir 30 and which opens downstream to the atmosphere. For example, this outlet 32 ​​is located in the upper wall of the reservoir 30.

[0030] Le système de décontamination 1 comprend en outre un dispositif deCleaning device 20 of the gas located in the upstream pipeline 10. This cleaning device 20 sprays liquid that wets the polluting particles present in the gas flowing through the upstream pipeline 10. These polluting particles are then carried by gravity to the bottom (lower part) of the tank 30 to form a certain quantity of polluted liquid. For example, the cleaning device 20 includes one or more liquid spray nozzles 21. The gas then enters the tank 30 and flows over the polluted liquid L. A standing wave of turbulent flow, called the foam zone, is generated on the surface of the polluted liquid upon contact with the gas. The foam zone creates a high rate of liquid surface renewal. Furthermore, the gas temperature is reduced to its adiabatic saturation temperature, which allows for the treatment of hot gases (up to 1200 °C).Thus, corrosive molecules (for example sulfurous ones such as SO2) present in the gas are absorbed into the liquid.

[0031] Le réservoir 30 contient du liquide L dans sa partie inférieure. Advantageously, the decontamination system 1 includes a recycling device 70 for the liquid contained in the tank 30. This recycling device 70 is capable of supplying liquid, for example water, to the tank 30 via a second pipe T2. This recycling device 70 is also capable of draining liquid from the tank 30 via a first pipe T1. The first pipe T1 is therefore upstream of the recycling device 70, and the second pipe T2 is downstream of the recycling device 70. The direction of liquid flow is illustrated in Figure 2 by black arrows.

[0032] Le liquide initialement présent dans le réservoir 30, et celui qui est amenéwhere applicable by the recycling device 70, is for example water. Advantageously, this liquid is water charged with a chemical reagent capable of reacting with the corrosive gas, and which in this case may be viscous. This reagent is introduced into this liquid by a reagent supplier 45, before or after this liquid is introduced into tank 30. This reagent supplier 45 is schematically illustrated in dotted lines in figure 2 in tank 30. The reagent is intended to react with the molecules of the corrosive gas in order to form a product which can then be easily extracted from the liquid, for example because this product is anhydrous.

[0033] Par exemple, dans le cas où le gaz pollué qui entre dans la canalisationThe upstream section 10 contains the sulfur pollutant SO2; this reagent contains CaCO3 (calcium carbonate). The decontamination system 1 includes an oxygen supplier 40 located in the reservoir 30, which, during operation, is situated below, ideally immediately below, the surface of the polluted liquid contained in the reservoir 30. This oxygen can be supplied in the form of air. The CaCO3 particles react with the oxygen supplied by the injector 40 and with the SO2 to form calcium sulfate according to the reaction:

[0034] Le sulfate de calcium CaSO4 est un composé chimique minéral anhydre, It is a solid with an ionic structure. Therefore, it does not mix with water. This allows it to be collected and drained at the first pipe, T1. The liquid subsequently returned to the reservoir is thus less polluted.

[0035] Avantageusement, le dispositif de nettoyage 20 est connectéfluidly to a pump 22 which is fluidly connected to the reservoir 30 and which is capable of supplying unpolluted liquid to the cleaning device 20. This connection may be at the level of the second pipe T2.

[0036] Avantageusement, le système de décontamination 1 comprend une grille 50, which is located in the reservoir 30 downstream of the portion of the reservoir 30 intended to contain the liquid and upstream of the outlet 32. The grid 50 collects any liquid droplets that may be carried by the gas flow circulating towards the outlet 32. For example, the grid 50 is a vane-type defogging device. As shown in Figure 2, the grid 50 is located above the lower part of the reservoir 30 where the contaminated liquid L is located. The gas flow rises from the inlet 31 and passes through the grid 50.

[0037] Avantageusement, la canalisation aval 60 est munie d’un ventilateur 65which circulates the gases from upstream to downstream. Thus, the extraction of gases from reservoir 30 is facilitated. This gas is air, or almost pure air, since the gas exiting the reservoir through outlet 32 ​​is decontaminated of gaseous and particulate pollutants.

[0038] L’invention concerne également un procédé de décontamination avec ledecontamination system as described above. In a step (a) a fluid reservoir 30, an upstream pipe 10 and a downstream pipe 60 are provided, the outlet port of the test bench 80 and the inlet port 31 of the reservoir 30 are fluidly connected by means of the upstream pipe 10, the inlet port 31 being located above the liquid L contained in the reservoir 30, and the outlet port 32 of the reservoir 30 is fluidly connected to the atmosphere by means of the downstream pipe 60, such that the polluted gas from the test bench flows in the upstream pipe 10, then in the reservoir 30 and then in the downstream pipe 60. For example the reservoir 30 initially contains an unpolluted liquid, for example water.

[0039] Dans une étape (b) on humidifie (on mouille) les particules de polluantpresent in the polluted gas, a cleaning device 20 located in the upstream pipeline 10 extracts the polluted particles from the polluted gas. These wet particles fall into the tank 30 by gravity.

[0040] Dans une étape (d) on récupère dans le réservoir 30 le liquide pollué de in order to dissolve the corrosive gas molecules present in the gas at the interface between the gas and the polluted liquid in a flow zone that forms at the interface between this gas and this polluted liquid.

[0041] Dans une étape (e) on évacue le gaz non pollué qui provient de la inlet pipe through outlet pipe 60. Steps (d) and (e) occur simultaneously.

[0042] Avantageusement, dans une étape (c) on met un réactif dans le liquidepolluted using a reagent supplier 45. This mixing of the reagent with the polluted liquid is carried out by placing this reagent in the tank 30 in step (a) or in step (d). For example, the reagent is placed in the liquid which is brought into the tank by the recycling device 70. In addition, in step (d), oxygen is (immediately) injected below the surface of the polluted liquid in the tank 30 using an oxygen supplier 40 in order to create a chemical reaction between the corrosive pollutant present in the gas and the reagent and the oxygen.

[0043] Avantageusement, dans une étape (f) entre l’étape (b) et l’étape (e), on collects liquid droplets present in the gas flowing towards the outlet 32 ​​of the tank using a grid 50. This grid 50 is located in the tank 30 above the contaminated liquid and upstream of the outlet 32. Thus, these droplets fall back into the contaminated liquid in the tank 30, which helps to clean the gas before it exits the tank 30.

Claims

Claims

1. A gas decontamination system (1) for a gas turbine (90) test bench (80), said system (1) being intended to extract pollutants present in the gas stream displaced by said turbomachine (90) during operation, said decontamination system (1) being characterized in that it comprises an upstream pipe (10) the upstream end (11) of which is intended to be fluidly connected to the outlet port of said test bench (80), a gas cleaning device (20) located in said upstream pipe (10), a fluid reservoir (30) the inlet port (31) of which is located above the liquid (L) contained in said reservoir (30) and is fluidly connected to the downstream end (12) of said upstream pipe (10), and a downstream pipe (60) which is fluidly connected to the outlet port (32) of said reservoir (30) and which discharges downstream into the atmosphere.

2. Decontamination system (1) according to theClaim 1 wherein it comprises a grid (50) located in said reservoir (30) downstream of the portion of said reservoir (30) intended to contain said liquid and upstream of said outlet orifice (32), and which is intended to collect liquid droplets.

3. Decontamination system (1) according to claim 2 wherein said grid (50) is a paddle-type defogging device.

4. Decontamination system (1) according to any one of claims 1 to 3 wherein it comprises an oxygen supplier (40) located in said reservoir (30) and intended to be located below the surface (S) of the liquid (L) contained in said reservoir (30), and a reagent supplier (45) capable of reacting with oxygen and corrosive molecules present in said gas.

5. Decontamination system (1) according to any one of claims 1 to 4 wherein that it includes a device for recycling (70) the liquid contained in saidreservoir (30), said recycling device (70) being fluidly connected upstream of said reservoir (30) by a first pipe (T1) and fluidly connected downstream of said reservoir (30) by a second pipe (T2).

6. Decontamination system (1) according to any one of claims 1 to 5, wherein the cleaning device (20) comprises at least one liquid spray nozzle (21).

7. Decontamination system (1) according to claim 6, wherein said cleaning device (20) is fluidly connected to a pump (22) which is fluidly connected to said reservoir (30) and which is capable of supplying liquid to the cleaning device (20).

8. Decontamination system (1) according to any one of claims 1 to 7, wherein said downstream pipe (60) is provided with a fan (65) which is capable of circulating the gases from upstream to downstream.

9. Gas decontamination process for a turbine test bench (80)gas (90) intended to extract pollutants present in the gas stream displaced by said turbine (90) during operation, said process being characterized in that it comprises the following steps: (a) A fluid reservoir (30), an upstream pipe (10), and a downstream pipe (60) are provided, and the outlet port of said test bench (80) and the inlet port (31) of said reservoir (30) are fluidly connected to said upstream pipe (10), said inlet port (31) being located above the liquid (L) contained in said reservoir (30), and the outlet port (32) of said reservoir (30) and the atmosphere are fluidly connected to said downstream pipe (60), such that the polluted gas from said test bench (80) flows to the atmosphere through said upstream pipe (10), said reservoir (30), and said downstream pipe (60);(b) The pollutant particles present in the said polluted gas are moistened using a device(20) cleaning which is located in said upstream pipe (10) so as to extract said particles of said polluted gas; (d) said polluted liquid is recovered in said tank (30) so as to dissolve the corrosive gas molecules present in said gas at the interface between said gas and said polluted liquid; (e) the unpolluted gas which comes from said inlet pipe (10) is discharged through said outlet pipe (60).

10. Gas decontamination process according to claim 9 wherein it comprises a step (c) in which a reagent is put into said polluted liquid using a reagent supplier (45) and wherein, in step (d), oxygen is sprayed under the surface of said polluted liquid in said tank (30) using an oxygen supplier (40) in order to create a chemical reaction between the corrosive pollutant present in said gas and said reagent and oxygen.

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