Denitration device, denitration system, drilling platform and denitration treatment method

Abstract

The invention discloses a denitration device, a denitration system, a drilling platform and a denitration treatment method, the denitration device is used for the drilling platform for offshore operation, at least one generator is mounted in a cabin of the drilling platform, and the denitration device is characterized by comprising at least one reactor, at least one mixing pipe and at least one reducing agent container, the mixing pipe is respectively communicated with a waste gas exhaust port of the generator, the reducing agent container and the reactor; a reducing agent is stored in the reducing agent container; a catalyst, waste gas exhausted by the generator and a reducing agent are stored in the reactor, and the catalyst generates a catalytic reduction reaction in the reactor so as to perform denitration treatment on the waste gas. According to the denitration device, the denitration system, the drilling platform and the denitration treatment method, nitrogen oxides (NOX) in waste gas can be converted into nitrogen and water which are harmless to the environment, so that the content of the nitrogen oxides in the waste gas is eliminated or reduced, and the environmental protection effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering and equipment, and in particular to a denitration device, a denitration system, a drilling platform and a denitration treatment method. Background Art

[0002] Nowadays, tightening environmental protection requirements have put forward higher demands on new technologies and new materials for marine engineering products. The existing self-elevating drilling platforms can no longer meet the market's requirements for environmental protection, and green marine engineering products will become the mainstream of future marine engineering design.

[0003] Among them, the offshore area has reached Tier III (i.e., third-level requirements) for NOX (nitrogen oxides) emitted by diesel engines on its drilling platforms. Therefore, drilling platforms are in urgent need of an effective NOX emission control solution to remove or reduce the NOX content produced after fuel combustion. At the same time, drilling platforms will use a large amount of clean fuels such as recycled fuel oil, which can greatly improve the green indicators of drilling platforms and meet the requirements of the times. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the problem that the offshore drilling platform in the prior art cannot effectively eliminate or reduce In order to improve the emission volume, a denitrification device, a denitrification system, a drilling platform and a denitrification treatment method are provided.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A denitration device is provided for use on an offshore drilling platform. At least one generator is installed in the engine room of the drilling platform. The denitration device comprises at least one reactor, at least one mixing tube and at least one reducing agent container. The mixing tube is respectively connected to the exhaust gas outlet of the generator, the reducing agent container and the reactor; the reducing agent container stores a reducing agent; the reactor stores a catalyst, and the exhaust gas discharged by the generator and the reducing agent and the catalyst produce a catalytic reduction reaction in the reactor to denitrate the exhaust gas.

[0007] In this scheme, the denitrification device is connected to the exhaust port of the generator and the reducing agent container through a mixing tube, and the exhaust gas and the reducing agent are concentrated in the mixing tube for full mixing. Then, the mixed gas is subjected to a catalytic reduction reaction in the reactor under the action of a catalyst, and the nitrogen oxides (NOX) in the exhaust gas are converted into nitrogen and water that are harmless to the environment, thereby eliminating or reducing the content of nitrogen oxides in the exhaust gas and improving the environmental protection effect. This treatment process for removing nitrogen oxides is called denitrification treatment.

[0008] Preferably, a detector is provided in the mixing tube, and the detector is used to detect the content of nitrogen oxides in the exhaust gas discharged by the generator.

[0009] In the present embodiment, the denitrification device can determine the content of nitrogen oxides in the exhaust gas through the above-mentioned detector, and choose whether to input the reducing agent or control the amount of the reducing agent according to the content of the nitrogen oxides to match the amount of nitrogen oxides in the exhaust gas, which is beneficial to ensure the effect of the catalytic reduction reaction, thereby improving the effect of the denitrification treatment.

[0010] Preferably, the denitrification device also includes a selection tube and a bypass tube, the selection tube is connected to the reactor, the mixing tube is switchably connected to one of the selection tube and the bypass tube and is closed to the other of the selection tube and the bypass tube, and the bypass tube is connected to the external environment.

[0011] In the present scheme, the denitrification device is arranged as above, when the content of nitrogen oxides in the exhaust gas is high, the mixing tube can be connected with the selection tube to transport the mixed gas to the reactor for denitrification treatment; when the content of nitrogen oxides in the exhaust gas is low or the area does not need denitrification treatment, the mixing tube can be connected with the bypass pipe to discharge the exhaust gas directly into the external environment without denitrification treatment.

[0012] Preferably, the denitration device further comprises a control system, the detector is electrically connected to the control system, the control system receives the content value of the nitrogen oxides detected by the detector, and controls the reducing agent container to output the reducing agent.

[0013] In the present scheme, the destocking device can automatically and in real time adjust the output of the reducing agent according to the detection result (the content value of nitrogen oxides) through the cooperation of the above-mentioned control system and the detector, ensuring that it matches the content value of nitrogen oxides, which is beneficial to improve the accuracy of the mixing ratio and thus improve the effect of the destocking treatment.

[0014] Preferably, the denitrification device also includes a control system, and a detector is provided in the mixing tube or the selection tube, and the detector is used to detect the content of nitrogen oxides in the exhaust gas discharged by the generator and feed back to the control system. The control system controls the mixing tube to switchly connect with one of the selection tube and the bypass tube and to be closed with the other of the selection tube and the bypass tube according to the detected content of nitrogen oxides and preset conditions.

[0015] In the present solution, the destocking device, through the cooperation of the above-mentioned control system, detector and mixing tube, can automatically and in real time switch the connection object of the mixing tube according to the detection result (the content value of nitrogen oxides) and preset conditions. The control of whether destocking treatment is needed is more accurate and the control method is more flexible.

[0016] Preferably, the preset condition is that when the content of the nitrogen oxides is not lower than a first ratio, the mixing tube is connected to the selection tube, and the mixing tube is closed and not connected to the bypass tube.

[0017] In this solution, the above-mentioned preset conditions ensure that the nitrogen oxide content is equal to or higher than the target first ratio, and then the destocking process can be carried out. Different first ratios can be set according to different emission area requirements.

[0018] Preferably, the outlet of the reactor is connected to a muffler, and the muffler is connected to the external environment through an exhaust pipe.

[0019] In this solution, the de-pinning device eliminates the exhaust gas generated by the generator and the vibration impact of the mixed gas on the pipeline through the muffler, reduces noise, and creates a comfortable environment.

[0020] A denitrification system, comprising a plurality of generators and a plurality of denitrification devices as described above, each of the denitrification devices comprising a reactor, a mixing tube and a reducing agent container connected in sequence, and the mixing tube of each denitrification device is connected to an exhaust gas outlet of the generator.

[0021] In this solution, in the de-gassing system, each component of each de-gassing device (reactor, mixing tube and reducing agent container) forms a set of connecting pipes with each generator in a one-to-one correspondence, and multiple sets of connecting pipes form an array of de-gassing treatment, which improves the de-gassing treatment efficiency. In addition, different de-gassing devices do not affect each other, which is beneficial to the effectiveness of exhaust gas de-gassing treatment and noise reduction.

[0022] A drilling platform comprises a cabin in which a generator is placed, a deck on top of the cabin and the above-mentioned denitration device, wherein the denitration device is installed on the deck; or the denitration device is installed in part of the cabin and on the deck.

[0023] In this solution, the drilling platform can concentrate the exhaust gas and the reducing agent into the mixing tube for sufficient mixing through the above-mentioned degassing device, and then produce a catalytic reduction reaction in the reactor under the action of the catalyst, which can convert the nitrogen oxides (NOX) in the exhaust gas into nitrogen and water that are harmless to the environment, thereby eliminating or reducing the content of nitrogen oxides in the exhaust gas and improving the environmental protection effect.

[0024] Preferably, the drilling platform includes a plurality of the generators and a plurality of the denitrification devices, each of the denitrification devices includes a reactor, a mixing tube and a reducing agent container which are connected in sequence, and the mixing tube of each of the denitrification devices is connected to an exhaust gas outlet of the generator.

[0025] In this solution, the drilling platform forms a one-to-one corresponding set of connecting pipes with each generator through each component of each de-pinning device (reactor, mixing tube and reducing agent container), and multiple de-pinning devices and corresponding generators form a de-pinning treatment array, which improves the de-pinning treatment efficiency. In addition, different de-pinning devices do not affect each other, which is beneficial to the effectiveness of exhaust gas de-pinning treatment and noise reduction.

[0026] A denitration treatment method for a drilling platform, wherein the denitration treatment method uses the above-mentioned denitration device to perform denitration treatment on the exhaust gas of the generator of the drilling platform, and the denitration treatment method comprises the following steps:

[0027] Step S1, transporting the exhaust gas discharged by the generator and the reducing agent in the reducing agent container to the mixing tube for mixing to form a mixed gas;

[0028] Step S2, transporting the mixed gas to the reactor and performing a catalytic reduction reaction with the catalyst in the reactor;

[0029] Step S3, discharging the gas and water after the catalytic reduction reaction into the external environment.

[0030] In this solution, the destocking treatment method of the drilling platform can convert nitrogen oxides (NOX) in the exhaust gas into nitrogen and water that are harmless to the environment through the above steps, thereby eliminating or reducing the content of nitrogen oxides in the exhaust gas and improving the environmental protection effect.

[0031] Preferably, a detector is provided in the mixing tube; and the following steps are also included before step S1:

[0032] Step S11, using the detector to detect the content of nitrogen oxides in the exhaust gas discharged by the generator, and controlling the reducing agent container to output the reducing agent according to the detected content of nitrogen oxides in the exhaust gas.

[0033] In this solution, the destocking treatment method of the drilling platform matches the detected nitrogen oxide content with the reducing agent through the above steps, which is beneficial to ensure the effect of the catalytic reduction reaction, thereby improving the effect of the destocking treatment.

[0034] Preferably, the denitration device further comprises a selection pipe and a bypass pipe, wherein the selection pipe is connected to the reactor, and the bypass pipe is connected to the external environment; and before step S2, the following steps are further included:

[0035] Step S21, detecting the content of nitrogen oxides in the exhaust gas discharged from the generator, and according to the detected content of nitrogen oxides and preset conditions, controlling the mixed gas to be transported from the mixing tube to the reactor via the selection tube, and closing the connection between the mixing tube and the bypass tube, or closing the connection between the mixing tube and the selection tube, controlling the exhaust gas and / or the mixed gas to be directly discharged into the external environment through the bypass tube.

[0036] In this scheme, the denitrification treatment method of the drilling platform goes through the above steps. When the content of nitrogen oxides in the exhaust gas is high, the mixed gas is transported to the reactor for denitrification treatment; and when the content of nitrogen oxides in the exhaust gas is low or the area does not require denitrification treatment, the exhaust gas is directly discharged into the external environment without denitrification treatment.

[0037] The positive progressive effect of the present invention is that the denitration device, denitration system, drilling platform and denitration treatment method can convert nitrogen oxides (NOX) in exhaust gas into nitrogen and water that are harmless to the environment, thereby eliminating or reducing the content of nitrogen oxides in the exhaust gas and improving the environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of the destocking device of Example 1 of the present invention.

[0039] Figure 2 This is a top view of the drilling platform according to Example 3 of the present invention.

[0040] Figure 3 This is a flow chart of the steps of the out-of-stock processing method of embodiment 4 of the present invention.

[0041] Description of reference numerals:

[0042] Drilling Platform 1

[0043] Cabin 11

[0044] Deck 12

[0045] Generator 2

[0046] Exhaust gas exhaust pipe 21

[0047] Destocking device 3

[0048] Urea injection interface 4

[0049] Mixing tube 5

[0050] Select Tube 6

[0051] Bypass pipe 7

[0052] Reactor 8

[0053] Silencer 9

[0054] Exhaust pipe 10

[0055] Bending pipe section 101 DETAILED DESCRIPTION

[0056] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0057] Example 1

[0058] This embodiment provides a denitration device 3 for an offshore drilling platform 1, wherein at least one generator 2 is installed in the engine room 11 of the drilling platform 1, and the denitration device includes at least one reactor 8, at least one mixing tube 5 and at least one reducing agent container (not shown in the figure). The mixing tube 5 is respectively connected to the exhaust gas outlet of the generator 2, the reducing agent container and the reactor 8; the reducing agent container stores a reducing agent, which is ammonia, urea or other nitrogen-containing compounds. The reactor 8 stores a catalyst, and the exhaust gas discharged by the generator 2 and the reducing agent and the catalyst produce a catalytic reduction reaction in the reactor 8 to denitrate the exhaust gas.

[0059] Specifically, Figure 1 As shown, the de-pinning device of this embodiment is a series of components connected to a generator 2. On the main connecting pipeline, the exhaust gas outlet of the generator 2 is connected in sequence with the exhaust gas outlet pipe 21, the mixing tank 5, the selection pipe 6, the reactor 8, the muffler 9 and the exhaust pipe 10; the branch of the mixing pipe 5 is also connected to the reducing agent container (not shown in the figure) through the injection interface 4, and is connected to the bypass pipe 7. In terms of layout, the generator 2 is arranged inside the engine room 11, below the deck 12, and the exhaust gas outlet pipe 21 extends from the engine room 11 to the top of the deck 12 and is connected to the mixing pipe 5. The reducing agent is urea, which is stored in the reducing agent container. Urea is sprayed into the mixing tube 5 through the urea injection interface 4. Urea and nitrogen oxides (NOX) in the exhaust gas are fully mixed in the mixing tube 5, and then the mixed gas is sent to the reactor 8. Under the action of the catalyst in the reactor 8, NOX and urea produce a catalytic reduction reaction to generate non-toxic and non-polluting nitrogen and water, so as to purify the NOX in the exhaust gas of the generator 2, that is, eliminate or reduce the NOX content in the exhaust gas, and improve the environmental protection effect. This treatment process of removing nitrogen oxides is called denitration treatment.

[0060] In other embodiments, the number of reactors 8, mixing tubes 5, exhaust pipes 10 and reducing agent containers can be adjusted accordingly as needed, and the connection mode can also be adjusted as needed. For example, one reducing agent container can supply reducing agent to multiple mixing tubes 5, or multiple reducing agent containers can supply reducing agent to multiple mixing tubes 5 respectively. In this embodiment, in terms of pipeline connection, one reactor 8 is connected to one mixing tube 5, one mixing tube 5 is connected to one reducing agent container through one urea access interface, and one mixing tube 5 is connected to one exhaust outlet of a generator 2 through one exhaust pipe 10, forming a one-to-one corresponding connecting pipeline.

[0061] Among them, a detector (not shown in the figure) is provided in the mixing tube 5, and the detector is used to detect the content of nitrogen oxides in the exhaust gas discharged by the generator 2. Through the above detector, the content of nitrogen oxides NOX in the exhaust gas can be judged, and according to the content of nitrogen oxides NOX, it is selected whether to inject urea or control the amount of urea to match the amount of nitrogen oxides in the exhaust gas, which is conducive to ensuring the effect of the catalytic reduction reaction, thereby improving the effect of the denitrification treatment.

[0062] In application, it is also possible to choose whether to spray urea and control the amount according to the emission requirements of different areas.

[0063] Among them, Figure 1 As shown, the selection tube 6 is connected to the reactor 8, the mixing tube 5 is switchedly connected to one of the selection tube 6 and the bypass tube 7, and is closed to the other of the selection tube 6 and the bypass tube 7, and the bypass tube 7 is connected to the external environment. Specifically, when the content of nitrogen oxides NOX in the exhaust gas is high, the mixing tube 5 can be connected to the selection tube 6 to transport the mixed gas to the reactor 8 for denitration treatment. At this time, the mixing tube 5 and the bypass tube 7 are closed and disconnected. When the content of nitrogen oxides NOX in the exhaust gas is low or the area does not need to be denitrated, the mixing tube 5 can be connected to the bypass tube 7 to discharge the exhaust gas directly into the external environment without denitration treatment. At this time, the mixing tube 5 and the selection tube 6 are closed and disconnected. Such switching and connection operations can be completed manually or automatically.

[0064] In this embodiment, the denitration device 3 uses an automatic control method to perform denitration treatment, so the denitration device also includes a control system, the detector is electrically connected to the control system, the control system receives the content value of nitrogen oxides detected by the detector, and controls the reducing agent container to output the reducing agent. Through the cooperation of the control system and the detector, the output amount of the reducing agent can be automatically and real-time adjusted according to the detection result (the content value of nitrogen oxides) to ensure that it matches the content value of nitrogen oxides, which is conducive to improving the accuracy of the mixing ratio, thereby improving the effect of the denitration treatment.

[0065] In the automatic control mode, when the mixing tube 5 is to realize automatic switching of the connection between different pipelines, the control system determines the content of nitrogen oxides NOX in the exhaust gas, and can compare the detected content of nitrogen oxides NOX with the preset conditions, thereby controlling the mixing tube 5 to switch and connect with one of the selection tube 6 and the bypass tube 7, and to close with the other one of the selection tube 6 and the bypass tube 7.

[0066] In this embodiment, the preset condition is that when the content of nitrogen oxides is not less than the first ratio, the mixing tube 5 is connected to the selection tube 6, and the mixing tube 5 is closed and not connected to the bypass tube 7. According to the different speeds of the generator 2, the amount of NOX contained in the exhaust gas is different. On this basis, according to different levels of emission standards, the emission limit is also different. This emission limit is the first ratio in the preset condition. For example, in the Tier III emission standard, when the speed of the generator 2 is lower than 130rpm, the emission limit is 3.4g / kWh. When the speed of the generator 2 is in the range of 130~2000rpm, the emission limit is determined by the calculation formula 9xn(-0.2)g / kWh, where n is the speed. When the speed is higher than 2000rpm, the emission limit is 2.0g / kWh1. In the Tier II emission standard, when the speed of the generator 2 is lower than 130rpm, the emission limit is 14.4g / kWh. When the speed of generator 2 is between 130 and 2000 rpm, the emission limit is determined by the calculation formula 44xn(-0.23)g / kWh, where n is the speed. When the speed of generator 2 is higher than 2000 rpm, the emission limit is 7.7g / kWh1. By presetting the comparison conditions in this way, it can be ensured that once the content of nitrogen oxides NOX is equal to or higher than the target first ratio, the control system can automatically perform the destocking process. Moreover, different first ratios can be set according to different emission area requirements.

[0067] In other embodiments, there are various ways to set the preset conditions according to different working conditions and requirements of different emission areas. For example, the NOx content average value sampled by the detector over a period of time may be used for judgment, or the maximum value of the NOx content sampled multiple times over multiple cycles may be used as the preset condition for comparison, or detection may be performed at different positions and different areas from the emission port to the mixing tube 5, and the average value of the NOx content detected at different positions may be used as the preset comparison condition.

[0068] Therefore, the destocking device 3, through the cooperation of the above-mentioned control system, detector and mixing tube 5, can automatically and in real time switch the connection object of the mixing tube 5 according to the detection result (the content value of nitrogen oxides) and preset conditions, and the control of whether destocking treatment is needed is more accurate and the control method is more flexible.

[0069] like Figure 1 As shown, the outlet of the reactor 8 is connected to a muffler 9, and the muffler 9 is connected to the external environment through an exhaust pipe 10. The de-pinning device 3 eliminates the exhaust gas generated by the generator 2 and the vibration impact of the mixed gas on the pipeline through the muffler 9, reduces the noise, and creates a comfortable environment.

[0070] Among them, there is a curved pipe section 101 at the end of the exhaust pipe 10, and the opening direction of the curved pipe section 101 can be set according to the requirements of the exhaust area to prevent the exhaust gas from being blown to the working area of ​​the drilling platform 1 by the wind and affecting the operators.

[0071] Example 2

[0072] This embodiment provides a denitration system, which is Figure 1 The array structure is formed by five generators 2 and five denitration devices connected thereto. Therefore, the denitration system includes five generators 2 and five denitration devices as in Example 1, each denitration device includes a reactor 8, a mixing tube 5 and a reducing agent container connected in sequence, and the mixing tube 5 of each denitration device is connected to the exhaust port of a generator 2. In the denitration system, each component (reactor 8, mixing tube 5 and reducing agent container) of each denitration device 3 forms a one-to-one corresponding set of connecting pipes with each generator 2, and the five generators 2 correspond to five connecting pipes. The two connecting pipes do not affect each other and independently complete the denitration treatment, which is beneficial to the effectiveness of the denitration treatment of the exhaust gas. When the five connecting pipes simultaneously perform denitration treatment on the exhaust gas of the five generators 2, the denitration treatment efficiency can be improved.

[0073] In other embodiments, the connection combination between each de-pinning device of the de-pinning system and multiple generators can be adjusted accordingly as needed, and it is not necessarily a one-to-one corresponding connection relationship as in the present embodiment. The one-to-one corresponding connecting pipelines used in the present embodiment as described above is a better choice.

[0074] Example 3

[0075] This embodiment provides a drilling platform 1, which includes a cabin 11 in which a generator 2 is placed, a deck 12 on top of the cabin 11, and a denitration device as in Example 1. Five generators 2 are arranged in the cabin 11, and the five generators 2 are connected to five denitration devices in a manner as in Example 2 to form five connecting pipelines. The five denitration devices are all installed above the deck 12.

[0076] In other embodiments, according to the requirements of the layout in the cabin 11 , a part of the de-pinning device 3 may be installed in part of the cabin 11 , and the remaining part of the de-pinning device 3 may be installed on the deck 12 .

[0077] The drilling platform 1 can concentrate the exhaust gas and the reducing agent into the mixing tube 5 for sufficient mixing through the above-mentioned de-pinning device 3, and then produce a catalytic reduction reaction in the mixed gas in the reactor 8 under the action of the catalyst, which can convert nitrogen oxides (NOX) in the exhaust gas into nitrogen and water that are harmless to the environment, thereby eliminating or reducing the content of nitrogen oxides in the exhaust gas and improving the environmental protection effect.

[0078] The drilling platform 1 forms a one-to-one corresponding set of connecting pipes with each generator 2 through each component (reactor 8, mixing tube 5 and reducing agent container) of each de-pinning device 3, and multiple de-pinning devices 3 and corresponding generators 2 form a de-pinning processing array, which improves the de-pinning processing efficiency. In addition, different de-pinning devices 3 do not affect each other, which is beneficial to the effectiveness of exhaust gas de-pinning processing and noise reduction.

[0079] The drilling platform using this embodiment is as follows Figure 2 As shown. When the drilling platform 1 is used, for the purpose of environmental protection, the generator 2 generally uses renewable fuel as clean fuel. Given the strong compatibility of renewable fuel, most fuel equipment can use it directly. However, when designing the system and selecting the equipment, the following considerations should be taken into account when choosing renewable fuel: (1) There is currently no unified international standard for renewable diesel, and the performance of each oil company's products varies. Relatively clear oil parameters are required during design; (2) The use of oil products must be approved by the diesel engine manufacturer and comply with its relevant requirements; (3) Pay special attention to the use of NBR (Nitrile Butadiene rubber) materials, as there are different clear statements; (4) According to the current NFPA20 (NFPA20 is the National Fire Protection Association of the United States), the fire pump of the diesel generator 2 is not recommended to use biodiesel. If it is a fire pump of the diesel generator 2, it must be equipped with a conventional fuel tank and an independent oil supply system.

[0080] In addition, the drilling platform 1 of this embodiment provides an intelligent drilling system in terms of intelligent applications, which can be used on the self-elevating drilling platform 1. It is equipped with an intelligent integrated control system, which integrates multiple intelligent applications such as AI test drilling, friction testing, and automatic sliding orientation, providing precise control and high consistency for drilling activities, and realizing the "autopilot" function of drilling. The intelligent drilling system standardizes the drilling process and automates repetitive drilling activities. It uses AI technology to identify formation changes and automatically optimize drilling parameters, allowing the driller to focus more on the drilling process and safety, reduce drilling risks, and improve drilling efficiency and quality. At the same time, it provides a process wizard interface for the centralized operation of multiple equipment, simplifies operations, reduces the error rate, and realizes dual closed-loop control on the platform and underground, locally and remotely. The drilling rig operates automatically, and the on-site personnel are only responsible for supervision and emergency operations, thereby reducing the platform staffing.

[0081] In terms of green application, the drilling platform 1 can meet the requirements for the NOX emission control area of ​​the diesel generator 2, improve the green index of the platform, and meet the increasingly stringent environmental protection requirements. In terms of intelligent application, it can effectively reduce the required area of ​​the drilling platform, improve the utilization rate of the drilling platform, reduce the number of platform personnel, and at the same time reduce the on-site workload during future platform operations, reduce personnel risks, and significantly improve the operation quality, efficiency and safety. Increase the market competitiveness of the self-elevating drilling platform 1.

[0082] Example 4

[0083] like Figure 3 As shown, this embodiment provides a denitration treatment method for a drilling platform 1, the denitration treatment method uses the denitration device as in Example 1 to denitrate the exhaust gas of the generator 2 of the drilling platform 1, and the denitration treatment method includes the following steps:

[0084] Step S1, transporting the exhaust gas discharged by the generator 2 and the reducing agent in the reducing agent container to the mixing tube 5 for mixing to form a mixed gas;

[0085] Step S2, transporting the mixed gas to the reactor 8, and performing a catalytic reduction reaction with the catalyst in the reactor 8;

[0086] Step S3, discharging the gas and water after the catalytic reduction reaction into the external environment.

[0087] The destocking treatment method of the drilling platform 1 can convert nitrogen oxides (NOX) in the exhaust gas into nitrogen and water that are harmless to the environment through the above steps, thereby eliminating or reducing the content of nitrogen oxides in the exhaust gas and improving the environmental protection effect.

[0088] Wherein, when a detector is provided in the mixing tube 5, the following steps are also included before step S1:

[0089] Step S11, using a detector to detect the content of nitrogen oxides in the exhaust gas discharged by the generator 2, and controlling the reducing agent container to output the reducing agent according to the detected content of nitrogen oxides in the exhaust gas.

[0090] The destocking treatment method of the drilling platform 1 matches the detected nitrogen oxide content with the reducing agent through the above steps, which is beneficial to ensure the effect of the catalytic reduction reaction, thereby improving the effect of the destocking treatment.

[0091] Wherein, when the denitration device is also equipped with a selection pipe 6 and a bypass pipe 7, the selection pipe 6 is connected to the reactor 8, and the bypass pipe 7 is connected to the external environment; then before step S2, the following steps are also included:

[0092] Step S21, detect the content of nitrogen oxides in the exhaust gas discharged by the generator 2, and according to the detected content of nitrogen oxides and preset conditions, control the mixed gas to be transported from the mixing tube 5 to the reactor 8 through the selection tube 6, and close the connection between the mixing tube 5 and the bypass tube 7, or close the connection between the mixing tube 5 and the selection tube 6, and control the exhaust gas and / or mixed gas to be directly discharged into the external environment through the bypass tube 7.

[0093] The denitrification treatment method of the drilling platform 1 is carried out through the above steps. When the content of nitrogen oxides in the exhaust gas is high, the mixed gas is transported to the reactor 8 for denitrification treatment; and when the content of nitrogen oxides in the exhaust gas is low or the area does not need denitrification treatment, the exhaust gas is directly discharged into the external environment without denitrification treatment.

[0094] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A denitration device for use on an offshore drilling platform, wherein at least one generator is installed in the engine room of the drilling platform, characterized in that: The denitration device includes at least one reactor, at least one mixing tube and at least one reducing agent container, wherein the mixing tube is respectively connected to the exhaust port of the generator, the reducing agent container and the reactor; the reducing agent container stores the reducing agent; the reactor stores the catalyst, and the exhaust gas discharged by the generator and the reducing agent and the catalyst produce a catalytic reduction reaction in the reactor to denitrate the exhaust gas.

2. The denitration device according to claim 1, characterized in that: A detector is arranged in the mixing tube, and the detector is used to detect the content of nitrogen oxides in the exhaust gas discharged by the generator.

3. The denitration device according to claim 1, characterized in that: The denitrification device also includes a selection tube and a bypass tube, the selection tube is connected to the reactor, the mixing tube is switchably connected to one of the selection tube and the bypass tube, and is closed to the other of the selection tube and the bypass tube, and the bypass tube is connected to the external environment.

4. The denitration device according to claim 2, characterized in that: The denitration device further includes a control system, the detector is electrically connected to the control system, the control system receives the content value of the nitrogen oxides detected by the detector, and controls the reducing agent container to output the reducing agent.

5. The denitration device according to claim 3, characterized in that: The denitrification device also includes a control system. A detector is provided in the mixing tube or the selection tube. The detector is used to detect the content of nitrogen oxides in the exhaust gas discharged by the generator and feed back to the control system. The control system controls the mixing tube to switchly connect with one of the selection tube and the bypass tube and to be closed with the other of the selection tube and the bypass tube according to the detected content of nitrogen oxides and preset conditions.

6. The denitration device according to claim 5, characterized in that: The preset condition is that when the content of the nitrogen oxides is not lower than a first ratio, the mixing tube is connected to the selection tube, and the mixing tube is closed and not connected to the bypass tube.

7. The denitration device according to claim 1, characterized in that: The outlet of the reactor is connected to a muffler, and the muffler is connected to the external environment through an exhaust pipe.

8. A denitration system, characterized in that: The denitrification system comprises a plurality of generators and a plurality of denitrification devices as described in any one of claims 1 to 7, each of the denitrification devices comprises a reactor, a mixing tube and a reducing agent container which are connected in sequence, and the mixing tube of each of the denitrification devices is connected to an exhaust gas outlet of the generator.

9. A drilling platform, characterized in that: The drilling platform comprises a cabin in which a generator is placed, a deck on top of the cabin, and a denitration device as described in any one of claims 1 to 7, wherein the denitration device is installed on the deck; or the denitration device is installed in part of the cabin and on the deck.

10. The drilling platform according to claim 9, characterized in that: The drilling platform includes a plurality of the generators and a plurality of the denitrification devices, each of the denitrification devices includes a reactor, a mixing tube and a reducing agent container which are connected in sequence, and the mixing tube of each of the denitrification devices is connected to an exhaust gas outlet of the generator.

11. A denitrification method for a drilling platform, characterized in that: The denitration treatment method uses the denitration device according to any one of claims 1 to 7 to perform denitration treatment on the exhaust gas of the generator of the drilling platform, and the denitration treatment method comprises the following steps: Step S1, transporting the exhaust gas discharged by the generator and the reducing agent in the reducing agent container to the mixing tube for mixing to form a mixed gas; Step S2, transporting the mixed gas to the reactor and performing a catalytic reduction reaction with the catalyst in the reactor; Step S3, discharging the gas and water after the catalytic reduction reaction into the external environment.

12. The denitration method for a drilling platform according to claim 11, characterized in that: The mixing tube is provided with a detector; and the following steps are also included before step S1: Step S11, using the detector to detect the content of nitrogen oxides in the exhaust gas discharged by the generator, and controlling the reducing agent container to output the reducing agent according to the detected content of nitrogen oxides in the exhaust gas.

13. The denitration method for a drilling platform according to claim 11, characterized in that: The denitration device further comprises a selection pipe and a bypass pipe, wherein the selection pipe is connected to the reactor, and the bypass pipe is connected to the external environment; and before step S2, the following steps are further included: Step S21, detecting the content of nitrogen oxides in the exhaust gas discharged from the generator, and according to the detected content of nitrogen oxides and preset conditions, controlling the mixed gas to be transported from the mixing tube to the reactor via the selection tube, and closing the connection between the mixing tube and the bypass tube, or closing the connection between the mixing tube and the selection tube, controlling the exhaust gas and / or the mixed gas to be directly discharged into the external environment through the bypass tube.

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