Industrial assembly with gas turbine with pollutant-gas capture and heat recovery

Abstract

An industrial assembly (80) with a gas turbine (90) comprises a pollutant-gas treatment device (70) capable of treating the gas flow displaced by the gas turbine (90). This treatment device (70) comprises a solid adsorbent (71), and the industrial assembly (80) comprises a heat recuperator (40) able to recover the heat emitted by the turbine (90) and then transfer this heat to a fluid supply device (50) that heats a fluid (51), the treatment device (70) being able to adsorb the pollutant gas from the gas flow into the adsorbent (71), and then to desorb the adsorbent (71) by heating, by the fluid (51), to a heating temperature (Tc) at least equal to the desorption temperature (Td) of said adsorbent (71), and to send the pollutant gas supplied by this desorption into a storage tank (60).

Description

Description Title: Industrial complex with gas turbine with pollutant gas capture and heat recovery

[0001] The present invention relates to an industrial assembly with a gas turbine comprising a system for depolluting the gas flow displaced by this gas turbine. In particular, the invention relates to a turbomachine test bench.

[0002] Such a test bench is described in document WO 2021 / 009226. With reference to FIG. 5 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, an exhaust duct 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 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 flow secondary FS, entering the tube 110 of the exhaust duct, causes by jet pump effect 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 6 by arrows, Figure 6 being a longitudinal view of the turbomachine 190 and the upstream part of the tube 110 of Figure 5. 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, it is possible to place in the exhaust stack 183 a filtration device 170 (also called a treatment device) for carbon dioxide.

[0005] Thus, in general, we know an industrial complex with a gas turbine 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 room containing the gas turbine, and a pollutant gas treatment device capable of treating the flow of gas displaced by the gas turbine in operation and which circulates to the exhaust chimney.

[0006] However, the concentration of polluting gas in the flow circulating in the exhaust stack 183 is low, which makes such a filtration device 170 ineffective. In addition, once the filter of the filtration device 170 is saturated with polluting gas (polluting gas adsorption phase in the filter) at the end of the operation of the gas turbine, it is necessary to regenerate this filter to recover the polluting gas and to allow the subsequent use of this filter during the next operation of a gas turbine. This regeneration requires heating the filter to a temperature higher than the maximum temperature during the adsorption phase (capture of the polluting gas by the filter). Indeed, in normal operation of the gas turbine, a succession of phases is carried out. of operation, separated by periods of shutdown (absence of operation). Description of the invention

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

[0008] The invention aims to propose an industrial assembly with a gas turbine which makes it possible to depollute the flow of gas displaced by the gas turbine, in particular to capture the polluting gas which is present, in the most efficient and economical way possible, within the framework of the usual operation of this industrial assembly with successive operating phases of the gas turbine separated by shutdown phases of the gas turbine.

[0009] This aim is achieved by the fact that the pollutant gas treatment system comprises at least one solid adsorbent, and in that the industrial assembly further comprises a heat recovery unit capable of recovering the heat emitted by the gas turbine during its operating phase and restoring this heat, a fluid supply device capable of using the heat recovered by the heat recovery unit to heat a fluid, and a pollutant gas storage tank, the pollutant gas treatment device being capable on the one hand of adsorbing in the at least one adsorbent the pollutant gas present in this gas flow, and being capable on the other hand of desorbing the at least one adsorbent by heating by the fluid to a heating temperature at least equal to the desorption temperature of the at least one adsorbent, and of sending the pollutant gas recovered during the desorption into the tank, this desorption being intended to take place after the adsorption in the adsorbent.

[0010] Thanks to these provisions, it is not necessary to use an external heat source to desorb the solid adsorbent, because the heat produced by the turbomachine is used, which would normally be dissipated and lost. Thanks to the invention, the test bench is therefore thermally optimized. In addition, the removal of heat from the exhaust duct by the heat recuperator during a test leads to a drop in the temperature of the flow circulating in the exhaust duct. The flow that is adsorbed in the solid adsorbent is therefore at a lower temperature (than in the absence of removal of this heat) which makes more efficient adsorption. In addition, in the period between two tests, this solid adsorbent is heated by the steam produced by the steam production device thanks to the heat produced by the turbomachine and recovered by the heat recovery unit. The solid adsorbent can thus be desorbed during this period (with restitution of the carbon dioxide it contains) and regenerated between two adsorption phases. The adsorbent used during a first phase of operation of the gas turbine can thus be used during a subsequent phase of operation of the gas turbine. This optimizes the operating time of the turbomachine and the adsorption process.

[0011] For example, the pollutant gas treatment device is capable of adsorbing the pollutant gas in the entire adsorbent and is capable of desorbing the entire adsorbent by heating.

[0012] For example, the pollutant gas treatment device comprises a single solid adsorbent and the treatment device is capable of adsorbing the pollutant gas in the entire adsorbent and is capable of desorbing the entire adsorbent by heating.

[0013] Thus, the entirety of this single solid adsorbent adsorbs carbon dioxide during an operating phase of a gas turbine, and possibly other polluting particles. The use of adsorbents is therefore optimized because it is not necessary to use a second adsorbent (distinct from this first adsorbent above) during a subsequent operating phase of the gas turbine (while the first adsorbent would be in the desorption phase), and consequently the architecture of the polluting gas treatment device is simplified and its size is minimized.

[0014] For example, the building further comprises an exhaust duct which is located downstream of the gas turbine and which is capable of receiving the flow of gas displaced by the gas turbine, and such that the heat recovery unit recovers the heat emitted by the gas turbine directly from the exhaust duct.

[0015] For example, the exhaust duct comprises an outer tube extending along a longitudinal axis with an inlet adapted to receive the flow of gas displaced by the gas turbine and an outlet which opens into the chimney exhaust, and such that the heat recuperator recovers heat on the external tube.

[0016] For example, the building comprises a second exhaust stack and the exhaust duct further comprises at least one inner tube extending along a longitudinal axis and which is located inside the outer tube with an inlet and an outlet which opens into the second exhaust stack such that during the operating phase of the gas turbine an internal flow of gas circulates in the at least one inner tube and an external flow of gas, separate from the internal flow, circulates in the outer tube outside the at least one inner tube, and such that the heat recovery unit recovers the heat directly on the at least one inner tube.

[0017] This way, a greater quantity of heat is recovered.

[0018] For example, the heat recovery unit is able to store the heat emitted by the gas turbine.

[0019] For example, heat exchanger comprises a material which is capable of carrying out heat storage.

[0020] For example, the fluid supplied by the fluid supply device is water vapor or a gas or water.

[0021] For example, the test bench further comprises an additional adsorber which is located in the path of the air flow which feeds the gas turbine, the additional adsorber being capable of being desorbed using the fluid supply device.

[0022] The invention also relates to a method for treating polluting gas present in the gas flow displaced by a gas turbine.

[0023] According to the invention, the method comprises the following steps: (a) An industrial assembly with a gas turbine is provided 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 room containing the gas turbine, the industrial assembly comprising a pollutant gas treatment device which comprises at least one solid adsorbent; (b) The gas turbine is operated and the polluting gas present in the gas flow which is displaced by the gas turbine during its operating phase and which circulates to the exhaust stack is adsorbed in the solid adsorbent; (c) The heat emitted by the gas turbine during the operating phase of step (b) is recovered using a heat recovery unit; (d) The operation of the gas turbine of step (b) is stopped; (e) The heat recovered in step (c) is returned to a fluid supply device capable of using the heat recovered by the heat recovery unit to heat a fluid; (f) The adsorbent is desorbed by heating with the fluid supplied in step (e) to a heating temperature at least equal to the desorption temperature of the adsorbent in order to recover the polluting gas adsorbed in step (b); (g) The pollutant gas recovered by desorption in step (f) is sent to a pollutant gas storage tank.

[0024] Advantageously, the heat recovered in step (c) is stored in a material which is located in the heat recovery unit before returning it in step (e).

[0025] This way, the adsorbent is heated to a more constant temperature, which makes desorption more efficient.

[0026] 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:

[0027] [Fig. 1] Figure 1 is a perspective view of a turbomachine test bench according to the invention.

[0028] [Fig. 2] Figure 2 is a perspective view of a turbomachine test bench according to another embodiment of the invention.

[0029] [Fig. 3] Figure 3 is a side view of the upstream portion of the turbomachine test bench of Figure 2.

[0030] [Fig. 4] Figure 4 is, in (A) a schematic illustration of the mechanism of adsorption by the adsorbent; and in (B) a schematic illustration of the mechanism of desorption of the adsorbent; in the carbon dioxide treatment device of a turbomachine test bench according to the invention.

[0031] [Fig. 5] Figure 5, already described, is a perspective view of a turbomachine test bench according to the prior art.

[0032] [Fig. 6] Figure 6, already described, is a side view of the upstream part of the turbomachine test bench of Figure 5. Detailed description of the invention

[0033] In the description below, the terms "upstream" and "downstream" are defined in relation to the normal direction of circulation of gas and air in the industrial assembly, in the gas turbine and in the exhaust duct during normal operation of this industrial assembly.

[0034] The invention is described below in the case where the gas turbine 90 is a turbomachine and where the industrial assembly 80 is a test bench for this turbomachine, but applies to any industrial assembly comprising a gas turbine where the displaced gas must be depolluted. Such an industrial assembly is for example a factory, a gas-fired thermal power station, an incinerator. The invention is described below in the case where the polluting gas is carbon dioxide CO2, but applies to any polluting gas (for example Sox, Nox) and polluting particles.

[0035] 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 room 82 and an exhaust chimney (83, 84) which comprises at least one (first) exhaust chimney 83. The air enters the room 82 through the vertical intake chimney 81 which is open to the outside at its inlet. The room 82 comprises a turbomachine 90 which is mounted on a thrust balance 91 and which is intended to be tested.

[0036] During operation of the turbomachine 90 (i.e. during a test), three air flows can be distinguished which circulate in 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 CO2 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.

[0037] These three air flows constitute the gas flow displaced by the turbomachine 90. This displaced gas flow passes through the exhaust stack (83, 84) 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, 84). This capture of carbon dioxide is carried out during the test of the turbomachine 90 (in the general case, during operation of the gas turbine 90, i.e. when the gas turbine 90 is running).

[0038] According to the invention, the carbon dioxide treatment device 70 comprises a solid adsorbent 71 which is intended to capture the carbon dioxide molecules. This carbon dioxide treatment device 70 is illustrated in Figure 4. Figure 4 (A) illustrates the adsorption phenomenon, in which the carbon dioxide molecules (shown schematically by black particles) which are present in the downstream flow are adsorbed in the adsorbent 71 (shown schematically by a group of porous cylinders). Thus, the gas which emerges from the adsorbent 71 downstream essentially comprises molecules other than carbon dioxide.

[0039] In one embodiment, the solid adsorbent 71 is sized so as to recover the emitted pollutant gas for a given time with a desired capture efficiency (in a non-limiting manner, this capture efficiency is, for example, greater than 25%, greater than 50%, greater than 75%, preferably greater than 90%). This given time corresponds, for example, to the test time of a gas turbine. For example, the treatment device 70 is capable of adsorbing the pollutant gas in the entire adsorbent 71. In a non-limiting manner, adsorbing in the entire adsorbent 71 means that more than 20% of the surface of the adsorbent 71 is saturated with pollutant gas. For example, more than 80% of the surface of the adsorbent 71 is saturated with pollutant gas. For example, 100% or almost 100% of the surface of the adsorbent 71 is saturated with pollutant gas. Without limitation, desorbing all of the adsorbent 71 means that more than 20% of the adsorbed pollutant gas is desorbed.For example, more than 80% of the adsorbed pollutant gas is desorbed. For example, 100% or almost 100% of the adsorbed pollutant gas is desorbed.

[0040] Advantageously, the carbon dioxide treatment device 70 comprises only a single solid adsorbent 71. The architecture and operation of the test bench 80 are explained below, which makes it possible to understand why the carbon dioxide treatment device 70 may comprise only a single solid adsorbent 71.

[0041] The test bench 80 comprises a heat recovery unit 40 which is capable of recovering the heat emitted by the turbomachine 90 during an operating phase of this turbomachine 90, and of restoring this heat after this operating phase. The restoration can possibly begin during the operating phase. Immediately at the outlet of the turbomachine 90, the temperature of the displaced gas flow is several hundred degrees Celsius. This heat is restored to be used to desorb all of the solid adsorbent 71, after the adsorption of the polluting gas (for example carbon dioxide) by the adsorbent 71. Indeed, desorption is a process which requires a heat input. This desorption is carried out at a temperature of heating Te which is at least equal to the desorption temperature Td of the adsorbent 71. The desorption temperature Td is higher than the ambient temperature, and advantageously higher than the maximum temperature of the gas at the inlet of the adsorbent 71 during the operating phase of the turbomachine. The desorption temperature Td is the temperature at which the adsorbent releases (restores) the polluting gas that it has adsorbed during the adsorption phase. Thus, the entire solid adsorbent 71 can be desorbed with recovery of the carbon dioxide, i.e. regenerated after an operating phase (here a test) of the turbomachine 90, during a period when there is no test. This solid adsorbent 71 can then be used again during a future test of a turbomachine. Figure 4 (B) illustrates this desorption phenomenon.In the case where the carbon dioxide treatment device 70 comprises only a single solid adsorbent 71, the use of the absorbents is thus optimized because it is not necessary to use a second adsorbent during this next test (while the first adsorbent would be desorbed). Consequently, the architecture of the carbon dioxide treatment device 70 is simplified. In particular, the volume and weight of this device 70 are reduced.

[0042] In addition, the heat recovery from the displaced gas flow is carried out downstream of the turbomachine 90 and upstream of the treatment device 70. The temperature of the displaced gas flow which is adsorbed in the solid adsorbent 71 is therefore reduced. However, it turns out that the solid absorption process is more efficient when it is carried out at a lower temperature (between 20°C and 50°C). The adsorption of carbon dioxide is therefore maximized.

[0043] Thus, it can be seen that the recovery and use of the heat emitted by the turbomachine 90 during a test of this turbomachine 90 makes it possible to optimize the operation of the carbon dioxide treatment device 70 in several aspects.

[0044] The heat recovery unit 40 comprises at least one heat exchanger (and alternatively a means for storing heat, see the description below). This heat exchange can be carried out by any means, for example by plates, or by tubes in which a fluid circulates, these plates or these tubes being immersed in another fluid. These fluids can be a liquid and a gas, two liquids, or two gases.

[0045] The operation of the heat recovery unit 40 and the heating of the adsorbent 71 are described in more detail below.

[0046] The test bench 80 comprises a fluid supply device 50 which is capable of using the heat recovered by the heat recovery unit 40 to heat and supply a fluid 51 at a temperature at least equal to a heating temperature Te which is higher than the ambient temperature. This ambient temperature is approximately equal to 20°C. This heating is carried out by passing the fluid through the heat recovery unit 40 and by heat exchange with this fluid. This heat exchange is carried out in a known manner, for example by conduction. The fluid 51, after passing through the heat recovery unit 40, is water vapor at a temperature higher than 100°C. Alternatively, the fluid 51 is water. Alternatively, the fluid 51 is a gas, for example nitrogen. The fluid communication between the heat recovery unit 40 and the fluid supply device 50 is carried out for example by one or more pipes.The fluid 51 is then distributed to the treatment device 70. The fluid communication between the fluid supply device 50 and the treatment device 70 is carried out for example by one or more pipes. The temperature of the fluid 51 produced by the fluid supply device 50 is at a temperature sufficiently higher than the heating temperature Te to reach the treatment device 70 at the heating temperature Te. The heating temperature Te is sufficient to allow the desorption of the solid adsorbent 71. For example, this heating temperature Te is greater than 100°C.

[0047] The test bench 80 further comprises a carbon dioxide storage tank 60. The carbon dioxide recovered (extracted) from the solid adsorbent 71 by its desorption is sent to the tank 60 to be stored there. This desorption is therefore carried out after the test of the turbomachine 90 and before a following test of a turbomachine 90. The fluid communication between the treatment device 70 and the tank 60 is carried out for example by one or more pipes.

[0048] According to one embodiment, downstream of the turbomachine 90 tested, there is an exhaust duct 30 which is intended to receive the flow of gases moved by the turbomachine 90 during its test. This exhaust duct 30 extends from the room 82 to the exhaust stack 83 so that the gas flow (or "gas flow") which enters the exhaust duct 30 leaves it at the exhaust stack 83. The heat recovery unit 40 recovers the heat emitted by the turbomachine 90 directly on the exhaust duct 30. This recovery is carried out for example by a pipe which transports a heat transfer fluid from the exhaust duct 30 to the heat recovery unit 40.

[0049] According to the embodiment of the invention which is illustrated in figure 1, the exhaust duct 30 comprises a tube 10 which extends along a longitudinal axis X1 and which is intended to receive at its inlet 11 (upstream end) the flow of gases which escape from the turbomachine 90 during its test. The longitudinal axis X1 is substantially the longitudinal axis along which the turbomachine 90 extends. The tube 10 is provided at its outlet 12 (downstream end) with a burster basket 13 which is a cylinder closed at its downstream end by a concave cover and pierced on its side wall with holes. The flow of gas F10 which circulates in the tube 10 leaves the burster basket 13 through these holes and rises in the exhaust chimney 83 then leaves into the atmosphere. The carbon dioxide treatment device 70 is located in the exhaust chimney 83. This tube 10 is called the outer tube 10 as opposed to the inner tube 20 which is described below.In operation (i.e. during a test of the turbomachine 90), the primary FP, secondary FS and induced Fl flows enter and then circulate in the external tube 10.

[0050] The heat recovery unit 40 recovers the heat emitted by the turbomachine 90 on the external tube 10.

[0051] According to another embodiment of the invention which is illustrated in Figure 2, the exhaust duct 30 further comprises an internal tube 20 which extends along a longitudinal axis X2 with an inlet 21 and an outlet 22 and which is located inside the external tube 10 and in the same direction.

[0052] In operation, an internal flow F20 of gas circulates inside the internal tube 20 and an external flow F10 of gas separate from the internal flow F20 circulates in the external tube 10 outside the internal tube 20.

[0053] In operation, the primary FP, secondary FS and induced Fl flows enter and then circulate in the outer tube 10, as illustrated in FIG. 3 by arrows. FIG. 3 is a longitudinal view of the turbomachine 90 and the upstream part of the outer tube 10 and the inner tube 20 of FIG. 2. For the sake of clarity, the thrust balance 91 is not shown.

[0054] The outer tube 10 and the inner tube 20 are coaxial, as illustrated in Figures 2 and 3. The longitudinal axes X1 and X2 are therefore coincident. The outer tube 10 and the inner tube 20 are concentric.

[0055] Thanks to its central position in the space of the outer tube 10, the inner tube 20 preferentially accommodates the gas flow which is the most central, that is to say closest to the longitudinal axis X1. Thus, the internal flow F20 is made up of the majority, or even almost all, of the primary flow FP, and a part of the secondary flow FS. The remainder of the secondary flow FS and almost all of the induced flow Fl constitute the external flow F10.

[0056] Since the primary flow FP leaves directly from the combustion chamber of the turbomachine 90, this primary flow FP is at a higher temperature than the secondary flow FS and the induced flow Fl. Thus, the internal flow F20 has a higher temperature than the external flow F10 which circulates in the external tube 10 outside the internal tube 20, and a higher temperature than a flow circulating in the external tube 10 in the absence of an internal tube. The heat recovery by the recuperator 40 directly on the internal tube 20 is therefore more efficient. The tests carried out by the inventors show that in the internal tube 20 it is possible to increase the temperature of the recovered flow by 50°C (compared to an exhaust duct 30 without an internal tube 20).

[0057] The tests carried out by the inventors show that in the inner tube 20 it is possible to capture up to 92% of the primary flow FP. Given that the primary flow FP is that of the three flows (FP, FS, Fl) which is by far the most loaded with carbon dioxide, carbonaceous particles and other pollutants, it is possible, thanks to the invention, to increase the concentration of carbon dioxide, carbonaceous particles and other pollutants in the flow treated by the treatment device 70 located downstream of the inner tube 10, in comparison with the flow which circulates in an exhaust duct 30 without an inner tube 20.

[0058] Conversely, the gas flow F10 which circulates in the tube 10 outside the inner tube 20 and which leaves the burster basket 13 then rises in the exhaust chimney 83 is very little pollutant-laden (even less than in the flow which circulates in the exhaust duct without inner tube 20). This gas flow F10 can therefore be allowed to exit through the extraction chimney 83 without filtering / treating it.

[0059] The internal flow F20 opens, at the outlet 22 of the internal pipe 20, into a second exhaust chimney 84. The second exhaust chimney 84 is located downstream of the (first) exhaust chimney 83. For example, the second exhaust chimney 84 is attached to the exhaust chimney 83, as illustrated in FIG. 2. The carbon dioxide treatment device 70 is located in the second exhaust chimney 84.

[0060] Alternatively, the exhaust duct comprises several internal tubes 20 located in the external tube 10.

[0061] The heat recovery unit 40, the fluid supply device 50, the carbon dioxide storage tank 60, and the carbon dioxide treatment device 70 are similar to those in the embodiment where the exhaust duct 30 comprises a single tube which is the outer tube 10, and operate identically.

[0062] In all embodiments, an advantage of the invention is that the heat supplied by the turbomachine 90 is reused directly in the form of heat, without being transformed into other energy (mechanical, electrical, etc.). Energy efficiency is therefore increased.

[0063] Optionally, and regardless of the embodiment, the heat recovery unit 40 is capable of storing (storing), for the entire duration of the test of the turbomachine 90, the heat emitted by the turbomachine 90. Thus, the heat recovery unit 40 is capable of storing this heat at least until the start of the desorption phase of the adsorbent 71. This configuration has the advantage that the heat supplied to the fluid supply device 50 is substantially uniform over time. Thus, the fluctuations in heat supply are smoothed out. occur during the test of the turbomachine 90 (these fluctuations are due to the irregular operation of the combustion chamber of the turbomachine 90). The temperature of the fluid 51 supplied by the fluid supply device 50 is therefore more uniform throughout the desorption (i.e. the temperature is more constant). The desorption of the adsorbent 71 is therefore more regular and more efficient.

[0064] For example, the heat recovery unit 40 comprises a material which is capable of carrying out this heat storage. For example, this material is chosen from the group comprising a phase change material, molten salts, sand, a refractory ceramic.

[0065] Optionally, the test bench 80 comprises, in addition to the device 70 for treating carbon dioxide in the gas flow displaced by the turbomachine 90, one (or more) additional adsorber (not shown) which is located upstream of the turbomachine 90. This additional adsorber has the function of capturing the carbon dioxide which is present in the air flow which supplies the turbomachine 90 (upstream air flow). This additional adsorber is desorbed using the fluid supply device 50 by supplying this additional adsorber with the fluid 51 supplied by this device 50.

[0066] The invention also relates to a method for treating polluting gas present in the gas flow displaced by a gas turbine 90, for example in a test bench 80 as described above.

[0067] Thus, according to the method of the invention, in step (a) an industrial assembly 80 is provided with a gas turbine 90 comprising a building 88 which comprises an air inlet chimney 81 at a first end of the building 88 and a gas exhaust chimney (83, 84) at a second end of the building 88, a room 82 containing the gas turbine 90. The industrial assembly 80 comprises a pollutant gas treatment device 70 which comprises a solid adsorbent 71

[0068] In step (b), the gas turbine 90 is operated and the gas is adsorbed in the solid adsorbent 71 (for example in the entire solid adsorbent 71). pollutant present in the gas stream which is moved by the gas turbine 90 in operation and which circulates to the exhaust stack (83, 84).

[0069] In step (c), the heat emitted by the gas turbine 90 during the test of step (b) is recovered using a heat recovery unit 40.

[0070] Steps (b) and (c) are therefore simultaneous.

[0071] In step (d), the operation of the gas turbine 90 of step (b) is stopped.

[0072] In step (e), the heat recovered in step (c) is returned to a fluid supply device 50 capable of using the heat recovered by the heat recovery unit 40 to heat a fluid 51.

[0073] In step (f), desorption is carried out in the adsorbent 71 (for example in the entire adsorbent 71) by heating with the fluid 51 supplied in step (e) to a heating temperature Te at least equal to the desorption temperature Td of the adsorbent 71 in order to recover the polluting gas adsorbed in step (b). Step (f) preferably takes place after the operation of the gas turbine 90 has stopped, i.e. after step (d). However, alternatively, the desorption may begin before the operation of the gas turbine 90 has stopped.

[0074] In step (g), the pollutant gas recovered by desorption in step (f) is sent to a pollutant gas storage tank 60.

[0075] The desorption step (f) takes place after the step (d), therefore after the adsorption step (b). In any case, the desorption of the adsorbent 71 necessarily takes place after the adsorption. However, the step (e) of using the heat recovered by the heat recovery unit 40 by the fluid supply device 50 (for heating the fluid 51) can begin before the operation stops (therefore before step (d)) or begin after step (d).

[0076] For example, the pollutant gas treatment device 70 comprises only a single solid adsorbent 71.

[0077] Optionally, the heat recovered in step (c) is stored in a material located in the heat recovery unit 40 before returning it in step (e). For example, step (e) takes place after step (d). In this case, the use of the heat recovered by the heat recovery unit 40 (step (e)) takes place after the end of the test of the turbomachine 90. Alternatively, the restitution of the heat and its use can begin before the stopping of the operation (here the test) of the turbomachine 90.

[0078] The invention applies to any type of turbomachine, for example a turboshaft or a turbofan.

Claims

Claims

1. Industrial assembly (80) with gas turbine (90) comprising a building (88) which has an air inlet chimney (81) at a first end of the building (88) and a gas exhaust chimney (83, 84) at a second end of the building (88), a room (82) containing said gas turbine (90), said industrial assembly (80) comprising a pollutant gas treatment device (70) capable of treating said gas flow displaced by said gas turbine (90) in operation and which circulates to said exhaust chimney (83, 84), said industrial assembly (80) being characterized in that said pollutant gas treatment device (70) comprises at least one solid adsorbent (71), and in that said industrial assembly (80) further comprises a heat recovery unit (40) capable of recovering the heat emitted by said gas turbine (90) during its operating phase and restore said heat,a fluid supply device (50) capable of using the heat recovered by said heat recovery unit (40) to heat a fluid (51), and a pollutant gas storage tank (60), said pollutant gas treatment device (70) being capable on the one hand of adsorbing in said at least one adsorbent (71) the pollutant gas present in said gas flow, and being capable on the other hand of desorbing said at least one adsorbent (71) by heating by said fluid (51) to a heating temperature (Te) at least equal to the desorption temperature (Td) of said adsorbent (71), and of sending the pollutant gas recovered during said desorption into said tank (60), said desorption being intended to take place after said adsorption in said adsorbent (71).,

2. Industrial assembly (80) according to claim 1 such that said pollutant gas treatment device (70) is capable of adsorbing the pollutant gas in the entirety of said at least one adsorbent (71) and is capable of desorbing the entirety of said at least one adsorbent (71) by heating.

3. Industrial assembly (80) according to claim 1 or 2 such that said pollutant gas treatment device (70) comprises a single solid adsorbent (71) and that the treatment device (70) is capable of adsorbing the pollutant gas in the entirety of said adsorbent (71) and is capable of desorbing the entirety of said adsorbent (71) by heating.

4. Industrial assembly (80) according to any one of claims 1 to 3 such that said building (88) further comprises an exhaust duct (30) which is located downstream of said gas turbine (90) and which is capable of receiving said gas flow displaced by said gas turbine (90), and such that said heat recovery unit (40) recovers the heat emitted by said gas turbine (90) directly on said exhaust duct (30).

5. Industrial assembly (80) according to claim 4 such that said exhaust duct (30) comprises an outer tube (10) extending along a longitudinal axis (X1) with an inlet (11) capable of receiving said gas flow displaced by said gas turbine (90) and an outlet (12) which opens into said exhaust chimney (83), and such that said heat recuperator (40) recovers heat on said outer tube (10).

6. Industrial assembly (80) according to claim 5 such that said building (88) comprises a second exhaust chimney (84) and such that said exhaust duct (30) further comprises at least one internal tube (20) extending along a longitudinal axis (X2) and which is located inside said external tube (10) with an inlet (21) and an outlet (22) which opens into said second exhaust chimney (84) such that during the operating phase of said gas turbine (90) an internal flow (F20) of gas circulates in said at least one internal tube (20) and an external flow (F10) of gas, separated from said internal flow (F20), circulates in said external tube (10) outside said at least one internal tube (20), and such that said heat recovery unit (40) recovers heat directly from said at least one internal tube (20).

7. Industrial assembly (80) according to any one of claims 1 to 6 such that said heat recovery unit (40) is capable of storing said heat emitted by said gas turbine (90).

8. Industrial assembly (80) according to claim 7 such that said heat recovery unit (40) comprises a material which is capable of storing said heat.

9. Industrial assembly (80) according to any one of claims 1 to 8 such that it further comprises an additional adsorber which is located on the path of the air flow which feeds said gas turbine (90), said additional adsorber being capable of being desorbed using said fluid supply device (50).

10. Industrial assembly (80) according to any one of claims 1 to 9 such that it is a test bench with turbomachine (90) and such that said polluting gas is carbon dioxide.

11. Method for treating polluting gas present in the gas flow displaced by a gas turbine (90) characterized in that it comprises the following steps: (a) An industrial assembly (80) with a gas turbine (90) is provided, comprising a building (88) which has an air inlet chimney (81) at a first end of the building (88) and a gas exhaust chimney (83, 84) at a second end of the building (88), a room (82) containing the gas turbine (90), said industrial assembly (80) comprising a pollutant gas treatment device (70) which comprises at least one solid adsorbent (71); (b) said gas turbine (90) is operated and the polluting gas present in the gas flow which is displaced by said gas turbine (90) during its operating phase and which circulates to said exhaust stack (83, 84) is adsorbed in said solid adsorbent (71); (c) the heat emitted by said gas turbine (90) is recovered during the operating phase of step (b) using a heat recovery unit (40); (d) stopping the operation of the gas turbine (90) of step (b); (e) The heat recovered in step (c) is returned to a fluid supply device (50) capable of using the heat recovered by said heat recovery unit (40) to heat a fluid (51); (f) said adsorbent (71) is desorbed by heating with said fluid (51) supplied in step (e) to a heating temperature (Te) at least equal to the desorption temperature (Td) of said adsorbent (71) in order to recover the polluting gas adsorbed in step (b); (g) The pollutant gas recovered by desorption in step (f) is sent to a pollutant gas storage tank (60).

12. A method of treating polluting gas according to claim 11, such that said heat recovered in step (c) is stored in a material which is located in said heat exchanger (40) before returning it in step (e).

13. Method for treating polluting gas according to claim 11 or 12 such that said industrial assembly (80) is a test bench, said gas turbine (90) is a turbomachine and such that said polluting gas is carbon dioxide.

Images