Gas turbine test bench with gas capture

Abstract

The invention relates to a gas turbine (90) test bench (80) comprising a building (88) which comprises an air inlet stack (81) at its first end and a gas exhaust stack (83) at its second end, a test hall (82) containing the gas turbine (90) intended to be tested, and at least one pollutant gas treatment device (70) capable of treating the gas flow which is displaced by the gas turbine (90) during operation and which flows to the exhaust stack (83). The pollutant gas treatment device (70) comprises a solid adsorbent (71) which consists of at least one modular block (72) having a plurality of channels (73), the walls of which are adsorbent and in which the displaced gas flow is able to flow.

Description

Description Title: Gas turbine test bench with gas capture

[0001] The present invention relates to a gas turbine test bench. More specifically, the invention relates to a turbomachine test bench comprising a system for depolluting a polluting gas present in the gas flow displaced by this turbomachine. For example, this polluting gas is carbon dioxide CO2.

[0002] Such a test bench is described in document WO 2021 / 009226. With reference to FIG. 8 which represents the prior art, the test bench comprises, from upstream to downstream (in the normal direction of air circulation) an intake chimney 181, a test room 182 and an exhaust chimney 183. The air enters the test room 182 through the vertical intake chimney 181 which is open to the outside at its inlet. The test room 182 comprises a turbomachine 190 which is mounted on a thrust balance 191. Downstream of the turbomachine 190 tested, there is an exhaust duct which comprises a tube 110 which is intended to receive at its inlet 111 (upstream end) the exhaust gases which escape from the turbomachine 190 during its test. This tube 110 is provided at its outlet 112 (downstream end) with a burster basket 113 which is a cylinder closed downstream by a concave cover and pierced with holes on its side wall.The exhaust gases exit the burster basket through these holes and rise up the exhaust stack 183 and then exit into the atmosphere.

[0003] During operation of the turbomachine, three air and gas flows can be distinguished which circulate in test room 182: - the primary flow (PF), which passes through the combustion chamber (HP (High Pressure) core) of the 190 turbomachine and participates in combustion. This primary flow PF is therefore at the outlet loaded with carbon dioxide CO2 but also with water, Sox, Nox and other particles; - the secondary flow (FS), which is compressed by the fan of the turbomachine 90 and which generates the majority of the thrust; - the induced air flow (Fl), which is sucked in by the depression at the outlet of the turbomachine 190. In fact, the engine flow, the sum of the primary flow FP and the secondary flow FS, when entering the tube 110 of the exhaust duct, causes by horn effect to jet a so-called “induced” flow which circulates in the test room 182 without passing through the turbomachine 190. These different flows are illustrated in Figure 9 by arrows, Figure 9 being a longitudinal view of the turbomachine 190 and the upstream part of the tube 110 of Figure 8. For the sake of clarity, the thrust balance 191 is not shown. All these flows circulate in the tube 110 of the exhaust duct.

[0004] Due to the combustion in the turbomachine 190, the above flows which mix and circulate in the exhaust duct include carbon dioxide which is released into the atmosphere at the outlet of the exhaust stack 183. This release of carbon dioxide is undesirable. To reduce this release into the atmosphere, and to depollute these flows, it is possible to place in the exhaust stack 183 a filtration device 170 (also called a treatment device) for the carbon dioxide contained in these flows. Such a filtration device 170 consists of a bed or a stack of grains of adsorbent material through which the flows to be depolluted pass. Such a device is that used in the direct capture of carbon dioxide in the ambient air (“Direct Air Capture” or DAC).

[0005] Thus, generally speaking, a gas turbine test bench is known comprising a building which has an air inlet chimney at a first end of the building and a gas exhaust chimney at a second end of the building, a test room containing the gas turbine intended to be tested, and at least one pollutant gas treatment device capable of treating the gas flow which is displaced by the turbine in operation and which circulates to the exhaust chimney.

[0006] However, the concentration of polluting gas (carbon dioxide in the example given above) in the flow circulating in the exhaust stack 183 is low (between 0.4% and a few percent). This characteristic makes the filtration device 170 inefficient. Furthermore, given that the air flow rate through the filtration device 170 is high, and that the operation of the test bench is discontinuous (the turbomachine test phases are separated by phases without tests), the filtration process is very energy-consuming. Furthermore, there is a pressure drop across the filtration device 170, and it is desirable to reduce this pressure drop in order to allow correct exhaust of gases in the bench during the entire test phase. Description of the invention

[0007] The present invention aims to remedy these drawbacks.

[0008] The invention aims to propose a gas turbine test bench in which the treatment of the polluting gas present in the gas flow displaced by this gas turbine in operation is carried out with a minimum of pressure loss through this treatment device, with optimal efficiency, and in the most economical way possible.

[0009] This aim is achieved by the fact that the pollutant gas treatment device comprises a solid adsorbent which is made up of at least one modular block having a plurality of channels whose walls are adsorbent and in which the displaced gas flow is able to flow.

[0010] Thanks to these provisions, the gas to be depolluted is able to flow more freely through the treatment device while being depolluted, and consequently the pressure drop through the pollutant gas treatment device is reduced. Indeed, the channel structure with adsorbent walls of the adsorbent (rather than a stacked grain structure) allows depollution while allowing a gas flow to flow more freely. In addition, the gas flow depollution process is simplified since, thanks to the structure of the adsorbent, it is possible to operate up to 85% humidity in the gas flow. It is therefore not necessary to use a dehumidification device upstream of the gas treatment device. Furthermore, the test bench and the gas treatment device are energetically optimized since it is the turbine itself that provides the suction for the gas flow during a test.Furthermore, in the case where the solid adsorbent is made up of a plurality of modular blocks, the modular block structure of the adsorbent allows adaptation to a variety of test bench architectures. This reduces the costs associated with modifying the test bench.

[0011] For example, the block or blocks consist of metal substrates shaped to form the channels and a porous adsorbent material that coats the substrates.

[0012] Thus, adsorption is more efficient and the pressure loss through the blocks is minimized.

[0013] For example, the adsorbent material is a metal-organic network.

[0014] Thus, adsorption is more efficient.

[0015] For example, at least two of the channels are parallel and their main axis A is oriented, at the upstream end of the channels, according to the flow direction of the displaced gas flow.

[0016] This minimizes the pressure loss through the blocks.

[0017] For example, each of the channels has a cross-section chosen from a polygonal section and a curvilinear section

[0018] For example, the open cross-sectional area of ​​the at least one block is greater than or equal to 70% of the total cross-sectional area of ​​the at least one block.

[0019] This minimizes the pressure loss through the blocks.

[0020] For example, the treatment device comprises a conduit which is connected to the exhaust stack downstream of the exhaust stack and such that the adsorbent rests directly on the ground.

[0021] This makes it easier to incorporate the adsorbent into the test bench building.

[0022] For example, the test bench includes a second pollutant gas treatment device which is located upstream of the gas turbine.

[0023] This optimizes the decontamination of gas flows.

[0024] For example, the test bench lacks a separate gas flow suction system for the displaced gas turbine.

[0025] The invention also relates to a method of making a gas turbine test bench which comprises a building which has an inlet chimney air at a first end of the building and a gas exhaust stack at a second end of the building and a test room containing the gas turbine to be tested.

[0026] According to the invention, the method comprises the following steps: (a) a modular block is constructed which has a plurality of channels whose walls are absorbent. (b) If necessary, step (a) is repeated in order to construct a plurality of modular blocks, the at least one modular block constituting an adsorbent, with which a pollutant gas treatment device is formed. (c) The pollutant gas device is arranged in the test bench in such a way that the gas flow which is displaced by the operating gas turbine and which circulates to the exhaust stack is able to flow in the channels.

[0027] For example, in step (b), the adsorbent consists of a plurality of the blocks which are arranged in a transverse plane perpendicular to the flow direction in the blocks to form a layer, this arrangement being repeated to form a plurality of such layers, the layers being aligned in the flow direction to form the adsorbent.

[0028] The invention will be better understood and its advantages will appear better on reading the detailed description which follows, of embodiments shown as non-limiting examples. The description refers to the appended drawings in which:

[0029] [Fig. 1] Figure 1 is a perspective view of a gas turbine test bench according to the invention.

[0030] [Fig. 2] Figure 2 is a perspective view of a gas turbine test bench according to another embodiment of the invention.

[0031] [Fig. 3] Figure 3 is a perspective view of a gas turbine test bench according to yet another embodiment of the invention.

[0032] [Fig. 4] Figure 4 is, in (A) a perspective view of the structure of the adsorbent; in (B) a perspective view of a block of the adsorbent; and in (C) a schematic illustration of the adsorption mechanism in a channel of a block of the adsorbent in perspective; in the gas treatment device of a gas turbine test bench according to the invention.

[0033] [Fig. 5] Figure 5 is, in (A) a perspective view of another embodiment of a block of the adsorbent; and in (B) a cross-sectional view of yet another embodiment of a block of the adsorbent; in the gas treatment device of a gas turbine test bench according to the invention.

[0034] [Fig. 6] Figure 6 is an illustration of a portion of an alternative embodiment of a block of the adsorbent of Figure 4(B).

[0035] [Fig. 7] Figure 7 is, at (A), an illustration of a portion of yet another embodiment of a block of the adsorbent; and at (B) an illustration of a portion of yet another embodiment of a block of the adsorbent; in the gas treatment device of a gas turbine test bench according to the invention.

[0036] [Fig. 8] Figure 8, already described, is a perspective view of a turbomachine test bench according to the prior art.

[0037] [Fig. 9] Figure 9, already described, is a side view of the upstream part of the turbomachine test bench of Figure 8. Detailed description of the invention

[0038] In the description below, the terms "upstream" and "downstream" are defined with respect to the normal direction of gas and air flow through the test bench, the gas turbine, and the exhaust duct during normal operation of the invention.

[0039] The invention is described below in the case where the gas turbine is a turbomachine and the test bench is a test bench, but applies to any gas turbine and any type of test. The invention is described below in the case where the polluting gas is carbon dioxide CO2, but applies to any polluting gas (e.g. Sox, Nox) and polluting particles.

[0040] Figure 1 shows a turbomachine test bench 90 according to the invention. This test bench 80 comprises a building 88 which comprises, from upstream to downstream (in the normal direction of air circulation during operation of the turbomachine 90) an intake chimney 81, a test room 82 and a chimney exhaust 83. Air enters the test room 82 through the vertical intake chimney 81 which is open to the outside at its inlet. The test room 82 comprises a turbomachine 90 which is mounted on a thrust balance 91 and which is intended to be tested.

[0041] During operation of the turbomachine 90 (i.e. during a period when the turbomachine is running (for example this period corresponds to the time of a test)), three air flows can be distinguished which circulate in the test room 82: - the primary flow (PF), which passes through the combustion chamber (HP (High Pressure) core) of the 90 turbomachine and participates in combustion. This primary flow PF is therefore at the outlet loaded with carbon dioxide but also with water, Sox, Nox and other polluting particles. - the secondary flow (FS), which is compressed by the fan of the turbomachine 90 and which generates the majority of the thrust. This secondary flow FS initially circulates around the primary flow FP. - the induced air flow (Fl), which is sucked in by the depression at the outlet of the turbomachine 90. Indeed, the engine flow, the sum of the primary flow FP and the secondary flow FS, upon entering the external tube 10, causes, by jet pump effect, a so-called “induced” flow which circulates in the test room 82 without passing through the turbomachine 90. This induced flow Fl initially circulates around the secondary flow FS.

[0042] These three air flows constitute the gas flow displaced by the turbomachine 90. This displaced gas flow passes through the exhaust stack 83 and then leaves the building 88. This displaced gas flow passes into a carbon dioxide treatment device 70 which is intended to treat this carbon dioxide and which is included in the test bench 80. For example, this treatment device 70 is located in the building 88. This treatment device 70 captures the carbon dioxide so that the gas flow leaving this treatment device 70 is as low in carbon dioxide as possible, i.e. this gas flow is depolluted. For example, this carbon dioxide treatment device 70 is located in the exhaust stack 83 or just above (at the downstream outlet) the exhaust stack on the path of the displaced gas flow downstream of the turbomachine 90, as illustrated in FIG. 1.This capture of carbon dioxide is carried out during the passage of the flow of displaced gas in the treatment device 70. In a non-conductive manner. limiting, the time of this capture corresponds to the operating time of the turbomachine 90 during a test of this turbomachine 90. Alternatively, the time of this capture is slightly longer than this operating time.

[0043] Alternatively, as illustrated in Figure 2, the carbon dioxide treatment device 70 comprises a conduit which is connected upstream to the outlet of the exhaust chimney 83, and which comprises the adsorbent 71 at its downstream end. The displaced gas flow therefore passes into this conduit when leaving the exhaust chimney 83 and then passes through the adsorbent 71. The adsorbent 71 rests on the ground, which facilitates its assembly and its inclusion in the treatment device 70. The gas flow passes through the adsorbent 71 in an essentially horizontal direction.

[0044] The carbon dioxide treatment device 70, which is located downstream of the turbomachine 90 on the path of the gas flow displaced by this turbomachine 90, constitutes a first treatment device which is part of the test bench 80. Indeed, the test bench 80 may comprise one or more other treatment devices, called second treatment device 60, which is located upstream of the turbomachine 90. This second treatment device 60 will be described below.

[0045] According to the invention, the (first) carbon dioxide treatment device 70 comprises a solid absorbent 71 which is intended to capture the carbon dioxide molecules. This carbon dioxide treatment device 70 is illustrated in FIG. 1 and FIG. 2. The solid adsorbent 71 consists of a modular block 72, or of a plurality of modular blocks 72, one of which is illustrated. The invention is described below in the case where the solid adsorbent consists of a plurality of blocks 72. These blocks 72 are joined together by their lateral faces. The blocks 72 therefore all extend in the same longitudinal direction. This longitudinal direction is substantially the direction in which the displaced gas flow passes through the blocks 72. In Figures 4(A) and 4(B), each block 72 is of rectangular (e.g., square) section such that the blocks 72 are all adjoining (i.e., there is no space between any two adjacent blocks 72).The blocks 72 may have sections of other geometries for which the assembly is optimal: hexagonal section, triangular section, section with concave and convex walls which fit together. Each block 72 has a plurality of channels 73 including. the walls are adsorbent and in which the displaced gas flow is able to flow. Each block 72 is divided into channels 73 by the walls of these channels 73 such that there is no space between these channels 73.

[0046] Figure 4(A) illustrates the carbon dioxide treatment device 70 according to the invention, the solid adsorbent 71 and the blocks 72 that compose it. For example, the adsorbent 71 has a parallelepiped shape and is made up of parallelepiped blocks 72 joined by their lateral faces and arranged in the same plane. The blocks 72 therefore form a single layer. Figure 4(B) shows an isolated block 72, with the channels 73 that pass through it from one face to the opposite face. Figure 4(B) also illustrates the adsorption phenomenon, in which the carbon dioxide molecules (shown schematically by black particles) that are present in the downstream flow are adsorbed in the surfaces of the walls of the channels 73. Thus, the gas that emerges from the adsorbent 71 downstream essentially comprises molecules other than carbon dioxide (these molecules are shown schematically by white particles).

[0047] The central curve of a channel 73 is defined as the line passing through the centers of the cross-sections of this channel 73 (a cross-section is perpendicular to the longitudinal direction of this channel, which is the direction in which it extends). In the general case, these central curves are curved. The main axis A of a channel 73 is then defined as the tangent to the central curve of the channel 73 at the upstream end of the channel 73. For example, the channels 73 are rectilinear. In this case, the central curve of a channel 73 is a straight line which coincides with the main axis A of the channel 73, which is called the central line.

[0048] For example, the two central curves of any two 73 channels are parallel, that is, any normal to one of these central curves is a normal to the other of these central curves. We then speak of parallel 73 channels. In the case where the 73 channels are rectilinear, this means that the central lines of the 73 channels are all parallel.

[0049] Advantageously, the main axis A of each channel 73 is oriented according to the flow direction of the displaced gas flow. This situation is shown in Figure 4(B) and Figure 4(C), where the flow direction of the displaced gas flow is shown by arrows.

[0050] Each channel 73 has a cross-section. For example, the cross-section is polygonal, that is, this section is formed by a polygon. For example, this polygon is a square, a rectangle, or a triangle. Alternatively, the cross-section is curvilinear, that is, the section is formed by a curve without an angular point. For example, this curve is an ellipse or a circle. Alternatively, the cross-section is formed by a curvilinear part and a polygonal or rectilinear part. For example, the cross-section is formed by a rectilinear segment and a curve that extends this segment at two angular points. This variant is illustrated in Figure 4(B) and Figure 4(C) in the case where this curve is a substantially sinusoidal arch.

[0051] Advantageously, the blocks 72 consist of substrates (74, 75) shaped into channels 73 and a porous adsorbent material 76 which covers these substrates (74, 75). For example, these substrates (74, 75) are metallic. For example, these substrates (74, 75) are manufactured from metal sheets. This metal is for example steel or an FeCrAI alloy.

[0052] For example, the metal substrates consist of first flat or curved sheets 74 and second corrugated sheets 75 which are stacked alternately and in point contact such that each second sheet 75 is sandwiched between two first sheets 74. Thus, each channel 73 is delimited by a portion of first sheet 74 and by an arch of a second sheet 75 which touches the first sheet 74 along two lines parallel to the main axis A of the channel 73.

[0053] According to an embodiment illustrated in Figure 4(B) and Figure 4(C), each block 72 is a tube of rectangular section, for example of square section, the first sheets 74 of this block 72 are flat, each second corrugated sheet 75 being sandwiched between two first sheets 74 and in point contact with them. Figure 4(C) also illustrates the adsorption phenomenon in a channel 73, in which the carbon dioxide molecules (black particles) which are present in the downstream flow are adsorbed in the adsorbent material 76 which covers the first sheet 74 and the second sheet 75. The first sheet 74 and the second sheet 75 covered with adsorbent material 76 thus form the walls of the channel 73. Thus, the gas which emerges from the adsorbent 71 downstream essentially comprises molecules (white particles) other than carbon dioxide. The transverse plane P shows in transparency the absorbent material 76 which covers the first sheet 74 and the second sheet 75.

[0054] According to another embodiment illustrated in Figure 5(A), each block 72 is a tube and the first sheets 74 of the block 72 are shaped into tubes coaxial with this tube. Each second sheet 75 is undulating between two first sheets 74 over a complete circumference. Thus a first sheet 74 and a second sheet 75 in point contact with this first sheet 74 form channels 73.

[0055] According to another embodiment, each block 72 is a tube and surrounds a first single sheet 74 which is spirally shaped. A second single sheet 75 extends undulatingly between the layers of this first sheet 74. Thus this first sheet 74 and this second sheet 75 form disjointed channels 73.

[0056] According to yet another embodiment illustrated in Figure 5(B), each block 72 is a tube and surrounds the first sheets 74 which are shaped into spirals which form S's. Each second sheet 75 is undulating between two first sheets 74. A portion of a second sheet 75 is illustrated. Figure 5(B) is a view of the block 72 in a transverse plane such that the main axis A (represented by a black dot) is perpendicular to the plane of the page. Thus a first sheet 74 and a second sheet 75 in contact with this first sheet 74 form disjoint channels 73.

[0057] Advantageously, the walls of the channels 73 have reliefs 77 which generate turbulence in the gas flow which circulates in these channels 73. Consequently, the adsorption of carbon dioxide in the channels 73 is more efficient. For example, the first sheets 74 and / or the second sheets 75 have reliefs 77. Figure 6 illustrates an example of these reliefs. The second sheets 75 have substantially sinusoidal undulations in the direction of the main axis A of each channel 73 over the entire length of each channel 73. These undulations therefore constitute these reliefs 77. The first sheets 74 do not have undulations. Alternatively, the first sheets 74 have undulations, for example identical to the undulations of the second sheets 75. Figure 6 also illustrates an enlargement of the portion of a channel 73 surrounded by a dotted circle (in a transverse plane perpendicular to the main axis A). This enlargement shows the deposition of adsorbent material 76 on the first sheet 74 and on the second sheet 75.

[0058] According to other embodiments of the invention, the metal substrates are made of first corrugated sheets 74 and second corrugated sheets 75 which are stacked alternately and in point contacts such that each second sheet 75 is sandwiched between two first sheets 74. These embodiments are less expensive than the embodiments with flat sheets 75 because all the sheets 74 and 75 are identical. In addition, the pressure drop through the channels 73 is reduced.

[0059] In a first of these other embodiments, illustrated in Figure 7(A), in perspective the first corrugated sheets 74 and the second corrugated sheets 75 are identical and are corrugated both in the transverse direction (perpendicular to the main axis A) and along the main axis A of each channel 73. Thus, each channel 73 is corrugated in the direction of its main axis A. Each channel 73 therefore has a central curve which is corrugated in the direction of its main axis A.

[0060] In a second of these other embodiments, illustrated in Figure 7(B) in top view, the first corrugated sheets 74 and the second corrugated sheets 75 are identical. Each sheet (74, 75) is corrugated in its main plane only in the transverse direction and therefore forms rectilinear parallel passages. The main axis of each of the channels of a first sheet 74 is oriented along a first main axis A1 and the main axis of each of the channels of a second sheet is oriented along a second main axis A2. The main planes of the first sheets 74 and second sheets 75 are parallel to a plane P, perpendicular to the plane of Figure 7(B). The first sheets 74 are offset in their main plane relative to the second sheets 75 by a small angle θ, for example between 2° and 10°. This variant has the advantage of introducing turbulence into the flow circulating in the channels 73 and therefore of promoting adsorption.

[0061] Advantageously, the thickness of the metal sheets (74, 75) is less than 100 microns, which increases the ratio of the open surface area of ​​the block 72 to its total cross-sectional area. The open surface area of ​​a block 72 is defined as the surface area without material in a cross-section of this block 72. For example, this thickness is less than 50 microns. For example, this thickness is between 20 microns and 30 microns.

[0062] To increase the adsorption capacity of the adsorbent 71, the number of channels 73 in a block 72 of given cross-section can be increased. For example, the density of channels 73 is greater than 155 channels / cm 2 (1000 channels / in 2 (channels per square inch)), for example greater than 190 channels / cm 2 (1200 channels / in 2 ), for example greater than 250 channels / cm 2 (1600 channels / in 2 ).

[0063] Advantageously, the adsorbent material 76 of the blocks 72 is a porous material which is a metal-organic framework (MOF). These materials have a covalent structure with ordered micro-porous or meso-porous hybrid crystals which are created from the reaction between organic molecules and metal ions. These structures are ultraporous (high porosity greater than 1000 m 2 per gram), which allows them to store a greater quantity of gas than conventional porous solids with lower porosity.

[0064] For example, this adsorbent material 76 is of the SIFSIX class or is of the MOF-74 class.

[0065] The layer of adsorbent material 76 has a thickness of between 5 and 30 microns, for example between 10 and 20 microns.

[0066] The first advantages of the adsorbent block 72 of the invention when the walls of the blocks 72 are made of metal substrates (74, 75) covered with a porous adsorbent material 76 are provided by this adsorbent material 76, which has - a carbon dioxide adsorption speed between 5 and 30 times faster than zeolite 13X, allowing a high capture efficiency even with high gas velocities and a shorter block length 72, - a carbon dioxide storage capacity at least equal to that of zeolite 13X and which remains high even at high temperatures (>65°C), - improved carbon dioxide / water selectivity, particularly when using a material from the MOF-74 class.

[0067] These first advantages are a reduction in both the cross-sectional area of ​​a block 72 (in particular due to a higher gas velocity) and its longitudinal length (along its main axis A) due to the high storage capacity of the retained material, stability in the capture performance after several adsorption / desorption cycles, and regeneration energy which remains half that of an absorption process using amine in aqueous solution.

[0068] The second advantages of the adsorbent block 72 of the invention are provided by the nature of the substrate (74, 75) and are as follows: - the choice of a metal substrate on which the adsorbent material 76 is deposited, rather than a ceramic substrate or a matrix made of extruded or 3D printed material, makes it possible to considerably reduce the wall thicknesses to a few tens of microns compared to several hundreds of microns. By thus reducing the material thicknesses between the channels 73 of a block 72, it is possible, for a given density of channels 73, to increase the open surface area of ​​a block 72 beyond 70%, for example up to 90% of the surface area of ​​a total cross-section of the block 72. This results in a reduction, for the same size of block 72, of the resistance to the gas flow. - in addition, the reduction in the thickness of the substrate allows the deposition of materials with a thickness of a few tens of microns to ensure a greater carbon dioxide retention capacity, always with an acceptable pressure drop and volume of the block 72. - the metal substrate has on the one hand a lower specific heat capacity than other materials which allows not to store the heat emitted during gas adsorption, and on the other hand a higher thermal conductivity which allows rapid heating during desorption for example. On the contrary, a ceramic substrate cannot withstand rapid heating and can crack.

[0069] The third advantages of the adsorbent block 72 of the invention are provided by the structure of this block 72. Indeed, the use of corrugated sheets 75 low thicknesses allow the number of channels to be significantly increased (up to 190 channels / cm 2 or more against 100 channels / cm 2 typically for ceramic blocks), which significantly increases the adsorption surface of a channel 73, which increases the carbon dioxide retention capacity for the same volume of a block 72.

[0070] According to a variant illustrated in FIG. 3, the test bench 80 comprises a second carbon dioxide treatment device 60 which is located upstream of the turbomachine 90. For example, this second treatment device 60 is located at the upstream end of the intake chimney 81. For example, alternatively or in addition, this second treatment device 60 is located between the intake chimney 81 and the test room 82. In this case, this second treatment device 60 can be located upstream and / or downstream of acoustic baffles (not shown) which are located in the test room 82 upstream of the turbomachine 90. This second treatment device 60 contributes to depolluting the gas flow before it enters the turbomachine 90.

[0071] Since the turbomachine 90, during its operation, generates a gas flow in the building 88, an additional suction system, separate from the turbomachine, is not necessary. However, alternatively, the building 88 comprises an additional suction system which contributes to circulating this gas flow.

[0072] The invention also relates to a method of producing a gas turbine 90 test bench 80 which comprises a building 88 as described above, this method comprising the following steps: (a) a modular block 72 is constructed which has a plurality of channels 73 whose walls are adsorbent. (b) If necessary, step (a) is repeated in order to construct a plurality of modular blocks 72, the modular block(s) 72 constituting an adsorbent 71, with which a device 70 for treating polluting gas is formed. (c) The pollutant gas device 70 is arranged in the test bench 80 such that the gas flow which is displaced by said gas turbine 90 in operation and which circulates to the exhaust chimney 83 is able to flow in the channels 73.

[0073] For example, step (a) comprises a step (a1) where an adsorbent material 76 is deposited on a metal substrate (74, 75) and a step (a2) where the metal substrate (74, 75) is shaped to form the plurality of channels. Step (a1) is carried out before or after step (a2). Advantageously, in all cases in step (a), a support or a guide is used by which the metal substrates (74, 75) are positioned in order to form a block 72. Indeed, since the metal substrates (74, 75) are thin, they are fragile and must be handled with care.

[0074] For example, the adsorbent material is deposited on the metal substrate (74, 75) by one of the following coating methods, which are particularly suitable for deposits in small channels (less than a millimeter for example) over a certain length (for example several tens of centimeters) which presents a difficulty:

[0075] A first method is "slurry coating" (called the "slurry method"), which consists of depositing a powder / binder suspension on the part to be treated, in this case the metal substrate, then using a thermal cycle to decompose the slurry and diffuse the deposited element.

[0076] A second method is Sol-Gel deposition (short for solution-gelation) by dip-coating, which is a process for producing materials that allows the synthesis of glasses, ceramics and organo-mineral hybrid compounds from precursors in solution.

[0077] A third method is cathodic electrophoresis, also called "cataphoresis", which is an electrochemical deposition process. The metal substrate to be coated is immersed in a bath of conductive, aqueous solution and, under the effect of a direct current applied to this substrate, which is conductive and forms the cathode, a layer of organic solution is deposited on the substrate.

[0078] Advantageously, step (a) has a step (a3) ​​after step (a1), or more generally immediately before step (b), during which a check is carried out on the uniformity of the thickness of the coating in the future longitudinal direction, and if necessary this deposition is adjusted or restarted in order to obtain satisfactory uniformity.

[0079] With regard to step (b), in an embodiment described above, the blocks 72 are assembled by their side walls in the same transverse plane to form a layer of blocks 72. This layer then constitutes the adsorbent 71.

[0080] In another embodiment in step (b), several of these layers are formed and then these layers are aligned in the longitudinal direction in order to constitute the adsorbent 71. The walls of the blocks 72 being thin, these blocks 72 are fragile and the handling of these blocks 72 is delicate. Advantageously, a support or a guide is used by which the layers of blocks 72 are positioned in order to align them exactly and without spaces between these layers. Thus, it is easier to construct a longer adsorbent 71. This length can reach several tens of centimeters, or even be greater than one meter. A reinforcement can also be added to these blocks 72 in order to stiffen the adsorbent 71 and prevent it from deforming.

Claims

Claims

1. A gas turbine (90) test bench (80) comprising a building (88) which has an air inlet stack (81) at a first end of the building (88) and a gas exhaust stack (83) at a second end of the building (88), a test room (82) containing said gas turbine (90) to be tested, and at least one pollutant gas treatment device (70) capable of treating said gas flow which is displaced by said gas turbine (90) in operation and which circulates to said exhaust stack (83), said test bench (80) being characterized in that said pollutant gas treatment device (70) comprises a solid adsorbent (71) which is made up of at least one modular block (72) having a plurality of channels (73) whose walls are adsorbent and in which said displaced gas flow is capable of flowing.

2. A gas turbine (90) test bench (80) according to claim 1 such that said at least one block (72) is made of metal substrates (74, 75) shaped to form said channels (73) and a porous adsorbent material (76) which covers said substrates (74, 75).

3. A gas turbine (90) test bench (80) according to claim 2 such that said adsorbent material (76) is a metal-organic network.

4. Test bench (80) for a gas turbine (90) according to any one of claims 1 to 3 such that at least two of said channels (73) are parallel and such that their main axis A is oriented, at the upstream end of said channels (73), according to the flow direction of the displaced gas flow.

5. A gas turbine (90) test bench (80) according to any one of claims 1 to 4 such that each of said channels (73) has a cross-section selected from a polygonal section and a curvilinear section.

6. A gas turbine (90) test bench (80) according to any one of claims 1 to 5 such that the open sectional area of ​​said at least one block (72) is greater than or equal to 70% of the total cross-sectional area of ​​said at least one block (72).

7. A gas turbine (90) test bench (80) according to any one of claims 1 to 6 such that said treatment device (70) comprises a conduit which is connected to said exhaust stack (83) downstream of said exhaust stack (83) and such that said adsorbent (71) rests directly on the ground.

8. Test bench (80) for a gas turbine (90) according to any one of claims 1 to 7 such that it comprises a second device (60) for treating polluting gas which is located upstream of said gas turbine (90).

9. Test bench (80) for a gas turbine (90) according to any one of claims 1 to 8 such that it is devoid of a suction system for said displaced gas flow separate from said gas turbine (90).

10. A method of producing a test bench (80) for a gas turbine (90) which comprises a building (88) which has an air inlet chimney (81) at a first end of the building (88) and a gas exhaust chimney (83) at a second end of the building (88) and a test room (82) containing said gas turbine (90) intended to be tested, said method being characterized in that it comprises the following steps: (a) a modular block (72) is constructed which has a plurality of channels (73) whose walls are adsorbent. (b) If necessary, step (a) is repeated in order to construct a plurality of said modular blocks (72), said at least one block (72) constituting an adsorbent (71), with which a device (70) for treating polluting gas is formed. (c) Said pollutant gas device (70) is arranged in said test bench (80) such that the gas flow which is displaced by said gas turbine (90) in operation and which circulates to said exhaust stack (83) is able to flow in said channels (73).

11. A method according to claim 10 such that, in step (b), said adsorbent (71) consists of a plurality of said blocks (72) which are arranged in a transverse plane perpendicular to the flow direction in said blocks (72) to form a layer, this arrangement being repeated to form a plurality of layers, said layers being aligned in said flow direction to form said adsorbent (71).

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