Gas treatment apparatus and gas turbine generating apparatus Technical field

The present utility model relates to the technical field of gas turbines, in particular to a gas treatment apparatus and a gas turbine generating apparatus having the gas treatment apparatus. Background art

A gas turbine is a rotary motive power machine which uses a continuous flow of air as a working medium and converts thermal energy to mechanical work. A generator driven by a gas turbine can generate clean electrical energy, so can be used not only to supply public electrical energy, but also for industrial purposes.

Gas turbines not only have the advantages of low emissions and high efficiency, but also have good load flexibility. Gases emitted by a gas turbine include nitrogen oxides (NOx) , which mainly comprise nitrogen oxide (NO) and nitrogen dioxide (NO ₂ ) ; nitrogen dioxide absorbs light in the blue spectrum and near-ultraviolet spectrum ranges, and appears yellow. Generally, a gas turbine runs on a basic load, in order to achieve maximum gains in terms of electrical energy production. In this case, the gases emitted by the gas turbine include substantially no nitrogen dioxide, and have no color. In a very small number of cases, for instance when the gas turbine load is less than 50% and the amount of oxygen entering the gas turbine is large, nitrogen dioxide will be produced, and even if the pollutant content of the emitted gases meets all legal requirements, the emitted gases are still yellow. At present, no method for treating yellow emitted gases at a high price-to-performance ratio has been found.

Content of the utility model

In view of the above, an object of the present utility model is to propose a gas treatment apparatus capable of diluting emitted gases to effectively lower the concentration of nitrogen dioxide in the emitted gases.

Another object of the present utility model is to propose a gas turbine generating apparatus, in the emitted gases of which there is a lower concentration of nitrogen dioxide. The present utility model provides a gas treatment apparatus disposed on a gas discharge cylinder, the gas treatment apparatus comprising: a gas-guiding support, the gas-guiding support being a hollow housing with two open ends, and being in communication with the gas discharge cylinder; at least one fan, configured inside the gas-guiding support; and at least one water mist sprayer, for spraying water mist into the gas-guiding support.

In a schematic embodiment of the gas treatment apparatus, the gas treatment apparatus also comprises: a fan mounting frame, the fan mounting frame being fixed inside the gas-guiding support, and the fan being mounted on the fan mounting frame.

In a schematic embodiment of the gas treatment apparatus, there is more than one of the water mist sprayer, the multiple water mist sprayers being arranged on a sidewall of the gas-guiding support.

In a schematic embodiment of the gas treatment apparatus, the gas treatment apparatus also comprises at least one cover plate, at least one mounting slot is provided on a sidewall of the gas-guiding support, and the cover plate is rotatably connected to the gas-guiding support and can cover the mounting slot or open relative to the mounting slot; the water mist sprayers are located in the mounting slot.

In a schematic embodiment of the gas treatment apparatus, the gas treatment apparatus also comprises: at least one guide plate, connected to a sidewall of the gas-guiding support and forming an included angle with the sidewall of the gas-guiding support; and at least one driving element, the driving element having one end fixed to the guide plate and another end connected to the cover plate, and being able to push the cover plate to open or close relative to the mounting slot.

The present utility model also provides a gas treatment apparatus mounted in a gas discharge cylinder, the gas treatment apparatus comprising: at least one fan, configured inside the gas discharge cylinder; and at least one water mist sprayer, for spraying water mist into the gas discharge cylinder.

In a schematic embodiment of the gas treatment apparatus, the gas treatment apparatus also comprises: a fan mounting frame, the fan mounting frame being fixed inside the gas discharge cylinder, and the fan being mounted on the fan mounting frame.

In a schematic embodiment of the gas treatment apparatus, the water mist sprayer is located inside the gas discharge cylinder or on a sidewall of the gas discharge cylinder.

The present utility model also provides a gas turbine generating apparatus comprising any one of the gas treatment apparatuses described above.

In a schematic embodiment of the gas turbine generating apparatus, the gas turbine generating apparatus also comprises: a gas turbine; a sensor, for sensing, in real time, gases emitted by the gas turbine, and the gas treatment apparatus is used for diluting the emitted gases.

It can be seen from the solution presented above that in the gas treatment apparatus and gas turbine generating apparatus of the present utility model, the gas treatment apparatus comprises a fan and a water mist sprayer; the water mist sprayer can spray water mist into the emitted gases, and the rotary action of the fan can thoroughly mix the emitted gases with the water mist, and thereby dilute the emitted gases, effectively lowering the concentration of nitrogen dioxide in the emitted gases . In addition, the gas treatment apparatus of the present utility model is only activated when the load on the gas turbine is low and the nitrogen dioxide content exceeds a certain proportion. The gases emitted by the gas turbine must be monitored in real time using a sensor, and the emitted gases are only permitted to be discharged into the atmosphere when the content of substances in the emitted gases complies with regulations; this helps to protect the environment.

Description of the accompanying drawings

Preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings, to give those skilled in the art a clearer understanding of the abovementioned and other features and advantages of the present utility model. Drawings:

Fig. 1 is a structural schematic diagram of a gas turbine generating apparatus in an embodiment of the present utility model.

Fig. 2 is a schematic sectional side view of a gas treatment apparatus in an embodiment of the present utility model. Fig. 3 is a schematic top view of the gas treatment apparatus shown in Fig . 2.

Fig. 4 is a structural schematic diagram of a water mist sprayer of the gas treatment apparatus shown in Fig. 2.

Fig. 5 is a schematic diagram of the gas treatment apparatus shown in Fig. 2 in one operational state.

Fig. 6 is a schematic diagram of the gas treatment apparatus shown in Fig. 2 in another operational state.

Fig. 7 is a schematic sectional side view of a gas treatment apparatus in another embodiment of the present utility model.

The labels used in the abovementioned accompanying drawings are as follows:

gas turbine generating

100

apparatus

101 pipeline

102 sensor

10 gas turbine

20 generator

30 steam turbine

40 waste heat boiler

43 gas discharge cylinder

gas treatment

50

apparatus

52 gas-guiding support

522 first end

523 second end

524 mounting slot 54 water mist sprayer

542 support

55 mounting frame

56 cover plate

57 guide plate

572 fixing rod

58 driving element

Dl, D2, D3 gas discharge channels

Particular embodiments

In order to clarify the object, technical solution and advantages of the present utility model, the present utility model is explained in further detail below by way of embodiments.

Fig. 1 is a structural schematic diagram of a gas turbine generating apparatus in an embodiment of the present utility model. Referring to Fig. 1, the gas turbine generating apparatus 100 comprises a gas turbine 10, a generator 20, a steam turbine 30 and a waste heat boiler (Heat Recovery Steam Generator (HRSG) 40; the generator 20 is connected to the gas turbine 10 and the steam turbine 30, and the gas turbine 10 and steam turbine 30 can supply motive power for power generation to the generator 20. The gas turbine 10 is connected to the waste heat boiler 40 via a gas pipeline 101, and gases emitted by the gas turbine 10 can flow into the waste heat boiler 40, in order to heat water in the waste heat boiler 40 and generate steam.

The waste heat boiler 40 is also connected to the steam turbine 30, and supplies steam to the steam turbine 30 in order to drive the operation of the steam turbine 30. Multiple water pipes 42 are provided in the waste heat boiler 40; the gases emitted by the gas turbine 10 act on the outer walls of the water pipes 42, thereby heating water in the water pipes 42 and generating steam. A gas discharge cylinder 43 (which may also be called a chimney) is also provided on the waste heat boiler 40; the emitted gases which flow out of the gas turbine 10 and through the waste heat boiler 40 can be discharged through the gas discharge cylinder 43. It must be explained that a sensor 102 is also provided at a gas discharge outlet of the gas turbine 10; the sensor 102 can monitor, in real time, the gases discharged by the gas turbine 10.

Fig. 2 is a schematic sectional side view of a gas treatment apparatus in an embodiment of the present utility model. Fig. 3 is a schematic top view of the gas treatment apparatus shown in Fig. 2. Referring to Figs. 2 and 3, the gas turbine generating apparatus 100 also comprises a gas treatment apparatus 50; the gas treatment apparatus 50 is disposed on the gas discharge cylinder 43 of the waste heat boiler 40, and used for diluting the emitted gases which flow out of the gas discharge cylinder 43.

The gas treatment apparatus 50 comprises a gas-guiding support 52, at least one fan 53 and at least one water mist sprayer 54; the gas-guiding support 52 is a hollow housing with two open ends, and is in communication with the gas discharge cylinder 43. The fan 53 is configured inside the gas-guiding support 52. The water mist sprayer 54 is used for spraying water mist into the gas-guiding support 52.

Specifically, the gas treatment apparatus 50 also comprises a fan mounting frame 55, at least one cover plate 56, at least one guide plate 57 and at least one driving element 58. In this embodiment, there are two fans 53, two cover plates 56 and two guide plates 57, and four driving elements 58, but this is not a restriction; in other embodiments, the number of fan(s) 53, cover plate (s) 56, guide plate (s) 57 and driving element (s) 58 may be one or more, and may be set arbitrarily according to actual needs. The positional relationships among all of the elements in the gas treatment apparatus 50, and the functions of these elements, are explained in detail below.

The gas-guiding support 52 has a square cross section, but the present utility model does not define the shape of the gas-guiding support 52; in other embodiments, the gas-guiding support 52 may also have a rectangular, polygonal or round cross section. The gas-guiding support 52 has a first end 522 and a second end 523 opposite the first end 522; the first end 522 is mounted on the gas discharge cylinder 43 of the waste heat boiler 40. A mounting slot 524 is provided on each of two opposite sidewalls of the gas-guiding support 52; the mounting slots 524 are provided at the second end 523 of the gas-guiding support 52. In other embodiments, there may be at least one mounting slot 524, with the number of mounting slot (s) 524 corresponding to the number of cover plate (s) 56.

The fan 53 is fitted onto the fan mounting frame 55, and located in a channel connecting the gas-guiding support 52 with the gas discharge cylinder 43. The fan 53 can cause the emitted gases which are discharged through the gas discharge cylinder 43 to be thoroughly mixed with water mist, thereby diluting the emitted gases .

Fig. 4 is a structural schematic diagram of a water mist sprayer of the gas treatment apparatus shown in Fig. 2. Referring to Fig. 4 at the same time, the water mist sprayer 54 is a hollow tubular body with multiple through-holes provided in the sidewall thereof. There are multiple water mist sprayers 54, arranged on a sidewall of the gas-guiding support 52. In this embodiment, the water mist sprayers 54 are arranged in two groups, each group comprising three water mist sprayers 54 which are arranged parallel with each other at intervals, with two ends of each water mist sprayer 54 each being fixed to a supporting frame 542. The supporting frame 542 is fixed to the gas-guiding support 52, and located in the mounting slot 524; the two groups of water mist sprayers 54 are arranged opposite one another. The water mist sprayed by the water mist sprayers 54 may be steam, which may originate from the waste heat boiler 40, with no need to separately provide a steam supply apparatus; this helps to reduce costs.

In other embodiments, the water mist sprayed by the water mist sprayer 54 may be formed by atomizing tap water; and one or more groups of water mist sprayers 54 may be provided. The present utility model does not define the number of water mist sprayers 54 included in each group of water mist sprayers 54; for instance, the gas treatment apparatus 50 may include only one water mist sprayer 54. The supporting frame 542 may be omitted, with the water mist sprayers 54 being fixed in the mounting slot 524 of the gas-guiding support 52 directly.

The fan mounting frame 55 comprises a rectangular frame and four fixing rods, the rectangular frame being located in a middle part of the fan mounting frame 55, and the four fixing rods extending out from the four corners of the rectangular frame and being fixed to an inside wall of the gas-guiding support 52; the structure of the fan mounting frame 55 is not limited to that described in this embodiment .

The cover plate 56 is rotatably connected to the second end 523 of the gas-guiding support 52, and can cover the mounting slot 524 or open relative to the mounting slot 524. When the cover plate

56 covers the mounting slot 524, the cover plate 56 is located on one side of the water mist sprayer 54, and the cover plate 56 faces the interior of the gas-guiding support 52.

The guide plate 57 is connected to a sidewall of the gas-guiding support 52, and forms an included angle with the sidewall of the gas-guiding support 52. Specifically, one end of the guide plate

57 is hinged to the bottom of the mounting slot 524, while the other end is connected to a fixing rod 572; the fixing rod 572 is connected between the guide plate 57 and the second end 523 of the gas-guiding support 52, such that the guide plate 57 and the gas-guiding support 52 form the included angle, and the emitted gases which flow out of the mounting slot 524 can flow out under the guiding action of the guide plate 57. In this embodiment, there are four fixing rods 572, but this is not a limitation.

One end of the driving element 58 is fixed to the guide plate 57, another end is connected to the cover plate 56, for the purpose of driving the cover plate 56 to open or close relative to the mounting slot 524. In this embodiment, the driving element 58 is a hydraulic rod, but this is not a limitation. There are four driving elements 58, wherein each pair of driving elements 58 are mounted at two opposite ends of one cover plate 56.

Fig. 5 is a schematic diagram of the gas treatment apparatus shown in Fig. 2 in one operational state. Referring to Figs. 5 and 1, when the gas turbine 10 is operating under a high load, the proportion of nitrogen dioxide in emitted flue gas is very low; the sensor 102 monitors the gases emitted by the gas turbine 10, and if the emitted gases comply with the regulations, then these gases are discharged from the outlet of the gas turbine 10 into the waste heat boiler 40, and flow out through the gas discharge cylinder 43. At this time, there is no need to activate the gas treatment apparatus 50, i.e. the fans 53 do not operate, the water mist sprayers 54 need not spray water mist, and the cover plate 56 covers the mounting slot 524 of the gas-guiding support 52. The emitted gases which flow out through the gas discharge cylinder 43 flow towards the opening at the second end 523 from the opening at the first end 522 of the gas-guiding support 52 and are discharged .

Fig. 6 is a schematic diagram of the gas treatment apparatus shown in Fig. 2 in another operational state. Referring to Figs. 6 and 1, when the gas turbine 10 is operating under a low load, for instance when the load on the gas turbine 10 is less than 50%, the proportion of nitrogen dioxide in the gases emitted by the gas turbine 10 may increase; the sensor 102 monitors the gases emitted by the gas turbine 10, and when the emitted gases comply with the regulations and the nitrogen dioxide content exceeds a certain proportion (e.g. when nitrogen dioxide accounts for more than 5% of nitrogen oxides) , the emitted gases are discharged from the outlet of the gas turbine 10 into the waste heat boiler 40, and flow out through the gas discharge cylinder 43. At this time, the emitted gases may be diluted, to lower the volume density of nitrogen dioxide, such that the color of the emitted gases remains normal; the gas treatment apparatus 50 is activated, with the driving rods 58 being controlled to drive the cover plates 56 to rotate, so that the cover plates 56 open relative to the mounting slots 524; the fans 53 are activated, and the water mist sprayers 54 are controlled to spray steam. The fans 53 can thoroughly mix the emitted gases, which flow from the gas discharge cylinder 43 into the gas-guiding support 52, with steam sprayed by the water mist sprayers 54, to effectively dilute the emitted gases, and cause the emitted gases which have been diluted to be discharged quickly. There are multiple discharge channels for the emitted gases which have been diluted, two of these channels being discharge channels Dl and D2 shown in Fig. 6; the emitted gases which have been diluted flow through the two mounting slots 524 of the gas-guiding support 52, and under the guiding action of the guide plates 57, are discharged through two sides of the gas-guiding support 52. Another channel is discharge channel D3 shown in Fig. 6; the emitted gases which have been diluted may also be discharged from that opening of the gas-guiding support 52 which is close to the second end 523. In this embodiment, when the cover plates 56 are open relative to the mounting slots 524, the cover plates 56 will block part of that opening of the gas-guiding support 52 which is close to the second end 523, but there will still be part of the opening which is not blocked, and the emitted gases which have been diluted can be discharged through this unblocked opening. In practical applications, the size of the unblocked opening can be adjusted by adjusting the size of the cover plates 56. Multiple discharge channels help to dilute the emitted gases further, so that the concentration of nitrogen dioxide in the emitted gases can be lowered, such that the emitted gases remain a normal color.

When it is not necessary to activate the gas treatment apparatus 50, the driving rods 58 are controlled to drive the cover plates 56 to rotate, and the cover plates 56 cover the mounting slots 524, i.e. the cover plates 56 return to their original positions.

Fig. 7 is a schematic sectional side view of a gas treatment apparatus in another embodiment of the present utility model. Referring to Fig. 7, the gas treatment apparatus 50 in this embodiment is similar to the gas treatment apparatus 50 shown in Fig. 2, the difference being that in the gas treatment apparatus 50 in this embodiment, the gas-guiding support 52 is omitted, and the function of the gas-guiding support 52 is integrated into the gas discharge cylinder 43. The gas treatment apparatus 50 in this embodiment comprises at least one fan 53 and at least one water mist sprayer 54, with the fan 53 being configured inside the gas discharge cylinder 43, and the water mist sprayer 54 being used for spraying water mist into the gas discharge cylinder 43.

Specifically, the gas treatment apparatus 50 in this embodiment also comprises a fan mounting frame 55, at least one cover plate 56, at least one guide plate 57 and at least one driving element 58; the structure of the gas-guiding support 52 in Fig. 2 is integrated in the gas discharge cylinder 43, the fan mounting frame 55 is fixed inside the gas discharge cylinder 43, and the fan 53 is mounted on the fan mounting frame 55. The cover plate 56 is rotatably connected to one end of the gas discharge cylinder 43. The water mist sprayer 54 is located inside the gas discharge cylinder 43 or located on a sidewall of the gas discharge cylinder 43. The guide plate 57 has one end connected to the gas discharge cylinder 43 and another end connected to a fixing rod 572; the fixing rod 572 is connected between the guide plate 57 and a sidewall of the gas discharge cylinder 43. Two ends of the driving element 58 are connected to the cover plate 56 and the guide plate 57 respectively. The operating principle of the gas treatment apparatus 50 in this embodiment is the same as the operating principle of the gas treatment apparatus 50 in Fig. 2, so is not repeated here.

Referring to Fig. 1 again, the gas turbine generating apparatus 100 proposed in the present utility model comprises the gas treatment apparatus 50 in any one of the embodiments described above The gas treatment apparatus 50 can dilute the emitted gases discharged by the gas turbine 10 of the gas turbine generating apparatus 100, to lower the concentration of nitrogen dioxide in the emitted gases. As well as being used for the gas turbine generating apparatus 100, the gas treatment apparatus 50 may also be used for gas engines, ship engines using diesel or heavy oil as fuel, etc.

The gas treatment apparatus and gas turbine generating apparatus of the present utility model have at least the following advantages :

1. In the gas treatment apparatus and gas turbine generating apparatus of the present utility model, the gas treatment apparatus comprises a fan and a water mist sprayer; the water mist sprayer can spray water mist into the emitted gases, and the rotary action of the fan can thoroughly mix the emitted gases with the water mist, and thereby dilute the emitted gases, effectively lowering the concentration of nitrogen dioxide in the emitted gases . In addition, the gas treatment apparatus of the present utility model is only activated when the load on the gas turbine is low and the nitrogen dioxide content exceeds a certain proportion. The gases emitted by the gas turbine must be monitored in real time using a sensor, and the emitted gases are only permitted to be discharged into the atmosphere when the content of substances in the emitted gases complies with regulations; this helps to protect the environment.

2. In one embodiment of the gas treatment apparatus and gas turbine generating apparatus of the present utility model, the water mist sprayed by the water mist sprayer is steam; the steam originates from the waste heat boiler, and there is no need to separately provide a steam supply apparatus; this helps to reduce costs.

3. In one embodiment of the gas treatment apparatus and gas turbine generating apparatus of the present utility model, a mounting slot is provided on a sidewall of the gas-guiding support, with one side of the mounting slot being further provided with a guide plate. Emitted gases which have been diluted can flow through the mounting slot and be guided out by the guide plate; emitted gases which have been diluted may also be discharged through that opening of the gas-guiding support which is close to the second end. Multiple gas discharge channels can dilute the emitted gases further, to lower the concentration of nitrogen dioxide in the gases .

4. In one embodiment of the gas treatment apparatus and gas turbine generating apparatus of the present utility model, the gas treatment apparatus has a simple structure, and can be mounted directly on the original gas discharge cylinder, with no need to modify the original structure of the gas turbine generating apparatus .

The embodiments above are merely preferred embodiments of the present utility model, which are not intended to limit it. Any amendments, equivalent substitutions or improvements etc. made within the spirit and principles of the present utility model shall be included in the scope of protection thereof.