Dust removal device suitable for offshore well cementation equipment and control method of dust removal device

Abstract

The invention discloses a dust removal device suitable for offshore well cementation equipment and a control method of the dust removal device, and solves the technical problems that an existing dust removal tank is limited in volume and cannot continuously remove dust and collect the dust. The dust removal device comprises a constant-pressure tank, a dust removal tank and an ash-gas separator, and further comprises an exhaust pipeline, one end of which is connected with the exhaust end of the constant-pressure tank and the other end of which is connected with the feeding end of the ash-gas separator; one end of the recovery pipeline is connected with the ash discharge end of the dust removal tank, and the other end is connected with the ash inlet end of the constant-pressure tank; one end of the blowing pipeline is connected with the ash discharge end of the dust removal tank, and the other end is connected with an air source; the gas source is used for conveying gas to the gas blowing pipeline, so that powder discharged from the dust discharging end of the dust removal tank can enter the constant-pressure tank through the recovery pipeline. The problem that the volume of a dust removal tank is limited is solved, dust can be continuously and effectively removed and collected in the long-time well cementation operation, the well cementation operation does not need to be interrupted, the time efficiency of the well cementation operation is improved, and the problems of powder waste and environmental pollution can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of dust removal devices, and in particular relates to a dust removal device suitable for offshore cementing equipment and a control method thereof. Background Art

[0002] Cementing is a key step in drilling and completion engineering. It requires the process of injecting a certain density and volume of cement slurry into the bottom of the well under specific high pressure conditions, so as to protect the casing, isolate the formation, and establish an oil and gas outflow channel. In oilfield cementing engineering, it is often necessary to continuously transport large quantities of cement and other powdered materials to mix cement slurry. At present, the commonly used dust removal devices are bag filter dust removal and cyclone centrifugal dust removal.

[0003] However, due to the large-scale development of deep water and deep wells, the dust removal tank of the bag filter dust removal device and the cyclone centrifugal dust removal device has a limited volume. When the dust removal tank is full of powder, the cementing operation can only be interrupted and the dust removal tank can be emptied, or the dust removal tank can be bypassed and discharged directly into the atmosphere. If the cementing operation is interrupted and the dust removal tank is emptied, the cementing operation time will be affected. If the dust removal tank is bypassed and discharged directly into the atmosphere, it will cause powder waste and environmental pollution. Problems need to be improved. Summary of the invention

[0004] In order to solve all or part of the above problems, the purpose of the present invention is to provide a dust removal device and a control method suitable for offshore cementing equipment, which overcomes the problem of limited volume of the dust removal tank. During long-term cementing operations, dust collection and backwashing can be continuously and effectively performed without interrupting the cementing operation, thereby ensuring the timeliness of the cementing operation. At the same time, it can also effectively improve the problems of powder waste and environmental pollution.

[0005] In a first aspect, the present invention provides a dust removal device suitable for offshore cementing equipment, comprising:

[0006] Constant pressure tank, used to connect ash storage tank and slurry mixing equipment;

[0007] Dust removal tank, used to collect powder;

[0008] An ash-gas separator is arranged on the top of the dust removal tank, and an ash discharge end of the ash-gas separator is connected to the dust removal tank;

[0009] An exhaust pipe, one end of which is connected to the exhaust end of the constant pressure tank, and the other end of which is connected to the feed end of the ash-gas separator, and the exhaust end of the constant pressure tank is provided with a first control valve;

[0010] A recovery pipe, one end of which is connected to the ash discharge end of the dust removal tank and the other end is connected to the ash inlet end of the constant pressure tank, and the ash discharge end of the dust removal tank is provided with a second control valve, and the ash inlet end of the constant pressure tank is provided with a third control valve;

[0011] An air blowing pipeline, one end of which is connected to the dust discharge end of the dust removal tank and the other end of which is connected to the air source, and a fourth control valve is provided on the air blowing pipeline;

[0012] The gas source is used to deliver gas to the air blowing pipe, so that the powder discharged from the dust removal end of the dust removal tank can enter the constant pressure tank through the recovery pipe, thereby realizing the discharge of the powder in the dust removal tank.

[0013] Optionally, the dust removal device further includes:

[0014] A monitoring system for monitoring the storage capacity of the dust removal tank and the pressure of the recovery pipeline and the constant pressure tank in real time;

[0015] HMI interface, for operators to input operation instructions and parameters;

[0016] A data acquisition system, connected to the monitoring system and the HMI interface respectively, the data acquisition system is used to collect the storage signal of the dust removal tank and the pressure signals of the recovery pipeline and the constant pressure tank in real time, and receive the operation instructions from the HMI interface;

[0017] A control system is connected to the data acquisition system, the first control valve, the second control valve, the third control valve and the fourth control valve respectively, and the control system is used to receive the operation instructions of the data acquisition system, and to control the opening and closing of the first control valve, the second control valve, the third control valve and the fourth control valve, and to adjust the opening degree of the second control valve.

[0018] Optionally, the monitoring system comprises:

[0019] A pressure detector is arranged on the dust removal tank and is used to monitor the storage capacity of the dust removal tank;

[0020] A first pressure gauge, disposed on the recovery pipeline and used to monitor the pressure of the recovery pipeline;

[0021] A second pressure gauge is provided on the constant pressure tank and is used to monitor the pressure of the constant pressure tank;

[0022] Wherein, the pressure detector, the first pressure gauge and the second pressure gauge are respectively connected to the data acquisition system.

[0023] Optionally, the dust removal tank includes a support seat, support legs and a storage tank, the ash-gas separator is fixed to the top of the storage tank, and the ash discharge end of the ash-gas separator is connected to the storage tank, the support legs are fixedly connected to the bottom of the storage tank, and the pressure detector is arranged between the support legs and the support seat, and is used to monitor the storage capacity of the storage tank.

[0024] Optionally, two pressure detectors are provided, and the two pressure detectors are respectively fixed on the support seat, and three support legs are provided. The three support legs are arranged at an interval of 120°, one of the support legs is hinged to the support seat, and the other two support legs are respectively pressed on the corresponding pressure detectors, so that the two pressure detectors can jointly monitor the storage capacity of the storage tank.

[0025] Optionally, a one-way valve is connected to the ash inlet end of the constant pressure tank, and the one-way valve is used to limit the powder to enter the constant pressure tank only through the recovery pipeline.

[0026] In a second aspect, the present invention provides a method for controlling a dust removal device, comprising the following steps:

[0027] S1, the control system controls the first control valve to open;

[0028] S2, the monitoring system monitors the dust removal tank storage volume W in real time 除尘罐重量 , the data acquisition system determines whether the real-time storage capacity of the dust removal tank has reached the set maximum weight;

[0029] S3: If the real-time storage volume of the dust removal tank does not reach the set maximum weight, continue to execute S2; if the real-time storage volume of the dust removal tank reaches the set maximum weight, the control system controls the third control valve, the fourth control valve, and the second control valve to open in sequence;

[0030] S4, the control system adjusts the opening of the second control valve;

[0031] S5, the monitoring system monitors the dust removal tank storage volume W in real time 除尘罐重量 , the data acquisition system determines whether the real-time storage capacity of the dust removal tank reaches the set minimum weight;

[0032] S6: If the real-time storage volume of the dust removal tank does not reach the set minimum weight, continue to execute S5; if the real-time storage volume of the dust removal tank reaches the set minimum weight, the second control valve, the fourth control valve, and the third control valve are controlled by the control system to be closed in sequence;

[0033] S7, determining whether the dust removal operation is completed. If the dust removal operation is not completed, continuously executing S1-S6 until the dust removal operation is completed.

[0034] Optionally, in S2, the storage capacity detection value of one pressure detector is W1, the storage capacity detection value of the other pressure detector is W2, and the storage capacity of the dust removal tank is W 除尘罐重量 =W1+W2.

[0035] Optionally, in S2, when the dust removal tank storage capacity W 除尘罐重量When the rated storage capacity of the dust removal tank reaches 90%, it is determined that the real-time storage capacity of the dust removal tank has reached the set maximum weight; otherwise, it is determined that the real-time storage capacity of the dust removal tank has not reached the set maximum weight.

[0036] Optionally, in S4, the data acquisition system compares the set storage capacity and the actual storage capacity of the dust removal tank, and adjusts the opening of the second control valve in real time through the control system, and through the formula:

[0037]

[0038] Calculate the opening of the second control valve, e(k) is the deviation between the current set storage and the actual storage, e(k-1) is the deviation at k-1, K p , K i , K d are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0039] Optionally, in S5, when the dust removal tank storage volume W 除尘罐重量 When the dust removal tank reaches 10% of the rated storage capacity, it is determined that the real-time storage capacity of the dust removal tank has reached the set minimum weight; otherwise, it is determined that the real-time storage capacity of the dust removal tank has not reached the set minimum weight.

[0040] Optionally, in S6, after the second control valve is closed, the fourth control valve and the third control valve are closed in sequence after a delay of 20 seconds to achieve back-purge of the recovery pipeline.

[0041] It can be seen from the above technical solutions that the dust removal device and control method thereof applicable to offshore cementing equipment provided by the present invention have the following advantages:

[0042] The dust removal device overcomes the problem of limited dust removal tank volume. During long-term cementing operations, it can continuously and effectively collect dust and backwash without interrupting cementing operations, thus ensuring the timeliness of cementing operations. At the same time, it can also effectively improve powder waste and environmental pollution problems.

[0043] Other features and advantages of the present invention will be set forth in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0045] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of the constant pressure tank in Example 1 of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of the dust removal tank in Example 1 of the present invention;

[0048] Figure 4 This is a flow control diagram of Example 2 of the present invention.

[0049] Description of reference numerals:

[0050] 1. Constant pressure tank; 2. Dust removal tank; 21. Support seat; 22. Support leg; 23. Storage tank; 3. Ash gas separator; 4. Exhaust pipe; 5. First control valve; 6. Recovery pipe; 7. Second control valve; 8. Third control valve; 9. Blowing pipe; 10. Air source; 11. Fourth control valve; 12. Monitoring system; 121. Pressure detector; 122. First pressure gauge; 123. Second pressure gauge; 13. HMI interface; 14. Data acquisition system; 15. Control system; 16. One-way valve. DETAILED DESCRIPTION

[0051] To make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other arbitrarily without conflict.

[0052] Example 1

[0053] like Figure 1 , Figure 2 , Figure 3 Embodiment 1 of the present invention is shown, which discloses a dust removal device suitable for offshore cementing equipment, including a constant pressure tank 1, a dust removal tank 2 and an ash-gas separator 3. The constant pressure tank 1 is used to connect the ash storage tank and the slurry mixing equipment, the dust removal tank 2 is used to collect powder, and the ash-gas separator 3 is used to separate the powder from the air.

[0054] In one embodiment, Figure 2 , Figure 3 As shown, a feed port, a discharge port and an ash feeding end are arranged at the top of the constant pressure tank 1, an exhaust end is arranged at the bottom of the constant pressure tank 1, a feed end is arranged at the top of the dust removal tank 2, and an ash discharge end is arranged at the bottom, and a feed end is arranged at the middle part of the ash-gas separator 3, an exhaust end is arranged at the top, and an ash discharge end is arranged at the bottom.

[0055] In one embodiment, Figure 1 , Figure 3 As shown, the ash-gas separator 3 is fixedly connected to the top of the dust removal tank 2, and the ash discharge end of the ash-gas separator 3 is connected to the feed end of the dust removal tank 2. When the air containing powder enters the interior through the feed end of the ash-gas separator 3, the powder enters the dust removal tank 2 through the ash discharge end of the ash-gas separator 3, and the air is discharged through the exhaust end of the ash-gas separator 3, thereby realizing dust removal.

[0056] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the exhaust end of the constant pressure tank 1 is connected to the feed end of the ash gas separator 3 through the exhaust pipe 4, so that the air containing powder in the constant pressure tank 1 can enter the ash gas separator 3 through the exhaust pipe 4. At the same time, the exhaust end of the constant pressure tank 1 is provided with a first control valve 5.

[0057] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the dust discharge end of the dust removal tank 2 is connected to the dust inlet end of the constant pressure tank 1 through a recovery pipe 6. When the dust removal tank 2 is full of powder, the powder can enter the constant pressure tank 1 through the recovery pipe 6, thereby realizing the emptying of the powder in the dust removal tank 2, so that the dust removal tank 2 can continuously perform dust removal operations. At the same time, the dust discharge end of the dust removal tank 2 is provided with a second control valve 7, and the dust inlet end of the constant pressure tank 1 is provided with a third control valve 8.

[0058] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the ash discharge end of the dust removal tank 2 is connected to an air blowing pipe 9, and the end of the air blowing pipe 9 is connected to an air source 10, thereby providing power for the flow of powder, so that the powder can smoothly pass through the recovery pipe 6 into the constant pressure tank 1. At the same time, a fourth control valve 11 is arranged on the air blowing pipe 9.

[0059] When the powder in the dust removal tank 2 is full or reaches the set weight, the third control valve 8, the fourth control valve 11, and the second control valve 7 are opened in sequence, and the gas source 10 is started. At this time, the powder in the dust removal tank 2 enters the constant pressure tank 1 through the recovery pipe 6, thereby realizing the emptying of the powder in the dust removal tank 2, so that the dust removal tank 2 can continuously perform dust removal operations.

[0060] The dust removal device suitable for offshore cementing equipment in this embodiment overcomes the problem of limited volume of the dust removal tank 2. During long-term cementing operations, it can continuously and effectively collect dust and backwash without interrupting the cementing operation, thereby ensuring the timeliness of the cementing operation. At the same time, it can also effectively improve the problems of powder waste and environmental pollution.

[0061] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the dust removal device also includes a monitoring system 12, an HMI interface 13, a data acquisition system 14 and a control system 15. The monitoring system 12 is used to monitor the storage capacity of the dust removal tank 2 and the pressure of the recovery pipeline 6 and the constant pressure tank 1 in real time. The HMI interface 13 is used for the operator to input operation instructions and operation parameters.

[0062] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the data acquisition system 14 is connected to the monitoring system 12 and the HMI interface 13 respectively. The data acquisition system 14 is used to collect the storage signal of the dust removal tank 2 and the pressure signals of the recovery pipeline 6 and the constant pressure tank 1 in real time, and receive the operation instructions from the HMI interface 13.

[0063] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the control system 15 is connected to the data acquisition system 14, the first control valve 5, the second control valve 7, the third control valve 8 and the fourth control valve 11 respectively, and the control system 15 is used to receive the operation instruction of the data acquisition system 14, and to control the opening and closing of the first control valve 5, the second control valve 7, the third control valve 8 and the fourth control valve 11, and to adjust the opening of the second control valve 7. In this embodiment, the control system 15 uses PLC as a controller to perform logic control and closed-loop regulation on all control valves and the data acquisition system 14.

[0064] In one embodiment, Figure 2 , Figure 3 As shown, the monitoring system 12 includes a pressure detector 121, a first pressure gauge 122 and a second pressure gauge 123. The pressure detector 121 is arranged on the dust removal tank 2 and is used to monitor the storage capacity of the dust removal tank 2. The first pressure gauge 122 is arranged on the recovery pipe 6 and is used to monitor the internal pressure of the recovery pipe 6. The second pressure gauge 123 is arranged on the constant pressure tank 1 and is used to monitor the internal pressure of the constant pressure tank 1. At the same time, the pressure detector 121, the first pressure gauge 122 and the second pressure gauge 123 are respectively connected to the data acquisition system 14, so that the data acquisition system 14 can collect storage capacity signals and pressure signals in real time.

[0065] In one embodiment, Figure 1 , Figure 3 As shown, the dust removal tank 2 includes a support base 21, support legs 22 and a storage tank 23. The ash-gas separator 3 is fixed to the top of the storage tank 23, and the ash discharge end of the ash-gas separator 3 is connected to the feeding end at the top of the storage tank 23, so that the powder can enter the storage tank 23. The support legs 22 are fixedly connected to the bottom of the storage tank 23, and the pressure detector 121 is arranged between the support legs 22 and the support base 21, and is used to monitor the storage capacity of the storage tank 23.

[0066] In one embodiment, Figure 1 , Figure 3As shown, two pressure detectors 121 are provided, and the two pressure detectors 121 are respectively fixed on the support seat 21, and three support legs 22 are provided, and the three support legs 22 are arranged at an interval of 120°, one of the support legs 22 is hinged to the support seat 21, and the other two support legs 22 are respectively pressed on the corresponding pressure detectors 121, so that the two pressure detectors 121 jointly monitor the storage tank 23. That is, the sum of the measurement values ​​of the two pressure detectors 121 is the weight of the powder in the storage tank 23.

[0067] In one embodiment, Figure 1 , Figure 2 As shown, the ash inlet end of the constant pressure tank 1 is connected with a one-way valve 16, which is used to limit the powder to enter the constant pressure tank 1 only through the recovery pipe 6. In this embodiment, the one-way valve 16 is a three-petal type and is vertically installed at the ash inlet end of the constant pressure tank 1, which effectively improves the passing rate of the ash-gas mixture and reduces the risk of clogging of the recovery pipe 6.

[0068] From the above process, it can be seen that the use of this dust removal device has the following advantages:

[0069] (1) It overcomes the problem of limited volume of existing dust removal tanks, and can realize the automatic control capability of continuous dust collection and continuous back-purge, thus improving the problems of powder waste and environmental pollution;

[0070] (2) When the dust removal tank is full of powder, the powder in the dust removal tank can be automatically emptied into the constant pressure tank, thereby realizing automatic dust removal and emptying of the dust removal tank, greatly reducing the labor intensity of the operator;

[0071] (3) The dust removal device can continuously and effectively remove dust and collect dust during long-term cementing operations in deep wells without interrupting the operation, and has continuous backwashing capabilities to ensure the timeliness of cementing operations;

[0072] (4) The pressure of the recovery pipeline and the constant pressure tank is monitored by the first pressure gauge and the second pressure gauge, so that the staff can quickly determine whether the recovery pipeline is blocked, whether the one-way valve is normal, etc., thereby improving the convenience of use.

[0073] Example 2

[0074] like Figure 4 The embodiment 2 of the present invention is shown, and the embodiment discloses a method for using a dust removal device, comprising the following steps:

[0075] S1, inputting the operation instruction and the corresponding operation parameters on the HMI interface 13, at this time, the control system 15 receives the operation instruction and controls the first control valve 5 to open;

[0076] S2, monitoring system 12 monitors the storage volume W of dust removal tank 2 in real time 除尘罐重量, the data acquisition system 14 determines whether the real-time storage capacity of the dust removal tank 2 reaches the set maximum weight;

[0077] S3, if the real-time storage volume of the dust removal tank 2 does not reach the set maximum weight, continue to execute S2, if the real-time storage volume of the dust removal tank 2 reaches the set maximum weight, the control system 15 controls the third control valve 8, the fourth control valve 11, and the second control valve 7 to open in sequence;

[0078] S4, the control system 15 adjusts the opening of the second control valve 7;

[0079] S5, the monitoring system 12 monitors the storage volume W of the dust removal tank 2 in real time 除尘罐重量 , the data acquisition system 14 determines whether the real-time storage capacity of the dust removal tank 2 reaches the set minimum weight;

[0080] S6, if the real-time storage volume of the dust removal tank 2 does not reach the set minimum weight, continue to execute S5, if the real-time storage volume of the dust removal tank 2 reaches the set minimum weight, the control system 15 controls the second control valve 7, the fourth control valve 11, and the third control valve 8 to be closed in sequence;

[0081] S7, determining whether the dust removal operation is completed. If the dust removal operation is not completed, continuously executing S1-S6 until the dust removal operation is completed.

[0082] In S2, the storage value detected by one pressure detector 121 is W1, the storage value detected by the other pressure detector 121 is W2, and the storage value of the dust removal tank 2 is W 除尘罐重量 =W1+W2.

[0083] In S2, when the real-time storage capacity of dust removal tank 2 is W 除尘罐重量 When the rated storage capacity of the dust removal tank 2 reaches 90%, it is determined that the real-time storage capacity of the dust removal tank 2 has reached the set maximum weight; otherwise, it is determined that the real-time storage capacity of the dust removal tank 2 has not reached the set maximum weight.

[0084] In S4, the data acquisition system 14 compares the set storage capacity and the actual storage capacity of the dust removal tank 2, and adjusts the opening of the second control valve 7 in real time through the control system 15, and uses the formula:

[0085]

[0086] Calculate the opening of the second control valve 7, e(k) is the deviation between the current set storage and the actual storage, e(k-1) is the deviation at k-1, K p , K i , K d are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0087] In S5, when the real-time storage volume of the dust removal tank 2 is W 除尘罐重量When the dust removal tank 2 reaches 10% of the rated storage capacity, it is determined that the real-time storage capacity of the dust removal tank 2 has reached the set minimum weight; otherwise, it is determined that the real-time storage capacity of the dust removal tank 2 has not reached the set minimum weight.

[0088] In S6 , after the second control valve 7 is closed, the fourth control valve 11 and the third control valve 8 are closed in sequence after a delay of 20 seconds to achieve back-purge of the recovery pipeline 6 .

[0089] The operation process of the dust removal device in this embodiment is as follows:

[0090] When the control system receives the operation instruction and controls the first control valve to open, the air containing powder in the constant pressure tank enters the ash-gas separator through the exhaust pipe, and then the powder enters the dust removal tank, and the clean air is discharged through the exhaust end of the ash-gas separator. At the same time, the two pressure detectors jointly monitor the storage capacity of the dust removal tank and transmit the storage capacity signal to the data acquisition system in real time.

[0091] When the two pressure detectors detect that the dust removal tank storage capacity reaches 90% of the rated storage capacity, the data acquisition system sends an operation instruction to the control system, and then the control system controls the third control valve, the fourth control valve, and the second control valve to open in sequence. At this time, under the action of the air source, the powder in the dust removal tank enters the constant pressure tank through the recovery pipe. At the same time, the data acquisition system collects storage capacity signals in real time and sends an operation instruction to the control system so that the control system can adjust the opening of the second control valve in real time.

[0092] When the two pressure detectors detect that the dust removal tank storage volume has dropped to 10% of the rated storage volume, the data acquisition system sends an operation command to the control system. At this time, the control system first closes the second control valve, and after a delay of 20 seconds, controls the fourth control valve and the third control valve to close in sequence. This is repeated. Whenever the powder storage volume in the dust removal tank reaches 90% of the rated storage volume, the powder in the dust removal tank is automatically discharged into the constant pressure tank, thereby realizing the automatic emptying of the powder in the dust removal tank.

[0093] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0094] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A dust removal device suitable for offshore cementing equipment, characterized in that: include: A constant pressure tank (1), used for connecting the ash storage tank and the slurry mixing equipment; A dust removal tank (2) for collecting powder; An ash-gas separator (3) is arranged on the top of the dust removal tank (2), and an ash discharge end of the ash-gas separator (3) is connected to the dust removal tank (2); An exhaust pipe (4), one end of which is connected to the exhaust end of the constant pressure tank (1), and the other end of which is connected to the feed end of the ash gas separator (3), and a first control valve (5) is provided at the exhaust end of the constant pressure tank (1); A recovery pipe (6), one end of which is connected to the ash discharge end of the dust removal tank (2) and the other end of which is connected to the ash inlet end of the constant pressure tank (1); the ash discharge end of the dust removal tank (2) is provided with a second control valve (7), and the ash inlet end of the constant pressure tank (1) is provided with a third control valve (8); An air blowing pipeline (9), one end of which is connected to the dust discharge end of the dust removal tank (2) and the other end of which is connected to the air source (10), and a fourth control valve (11) is provided on the air blowing pipeline (9); The gas source (10) is used to deliver gas to the air blowing pipe (9) so that the powder discharged from the dust removal tank (2) can enter the constant pressure tank (1) through the recovery pipe (6), thereby realizing the discharge of the powder in the dust removal tank (2).

2. The dust removal device according to claim 1, characterized in that: The dust removal device also includes: A monitoring system (12) for monitoring the storage capacity of the dust removal tank (2) and the pressure of the recovery pipeline (6) and the constant pressure tank (1) in real time; HMI interface (13), for operators to input operation instructions and operation parameters; A data acquisition system (14) is connected to the monitoring system (12) and the HMI interface (13) respectively, and the data acquisition system (14) is used to collect the storage signal of the dust removal tank (2) and the pressure signals of the recovery pipeline (6) and the constant pressure tank (1) in real time, and receive the operation instructions from the HMI interface (13); A control system (15) is connected to the data acquisition system (14), the first control valve (5), the second control valve (7), the third control valve (8) and the fourth control valve (11) respectively. The control system (15) is used to receive operation instructions from the data acquisition system (14), and to control the opening and closing of the first control valve (5), the second control valve (7), the third control valve (8) and the fourth control valve (11), and to adjust the opening degree of the second control valve (7).

3. The dust removal device according to claim 2, characterized in that: The monitoring system (12) comprises: A pressure detector (121) is arranged on the dust removal tank (2) and is used to monitor the storage capacity of the dust removal tank (2); a first pressure gauge (122), arranged on the recovery pipeline (6) and used to monitor the pressure of the recovery pipeline (6); A second pressure gauge (123) is disposed on the constant pressure tank (1) and is used to monitor the pressure of the constant pressure tank (1); The pressure detector (121), the first pressure gauge (122) and the second pressure gauge (123) are respectively connected to the data acquisition system (14).

4. The dust removal device according to claim 3, characterized in that The dust removal tank (2) comprises a support seat (21), a support leg (22) and a storage tank (23); the ash-gas separator (3) is fixed to the top of the storage tank (23), and the ash discharge end of the ash-gas separator (3) is connected to the storage tank (23); the support leg (22) is fixedly connected to the bottom of the storage tank (23); the pressure detector (121) is arranged between the support leg (22) and the support seat (21), and is used to monitor the storage capacity of the storage tank (23).

5. The dust removal device according to claim 4, characterized in that: Two pressure detectors (121) are provided, and the two pressure detectors (121) are respectively fixed on the support seat (21); three support legs (22) are provided, and the three support legs (22) are arranged at intervals of 120°, one of the support legs (22) is hinged to the support seat (21), and the other two support legs (22) are respectively pressed on the corresponding pressure detectors (121), so that the two pressure detectors (121) jointly monitor the storage capacity of the storage tank (23).

6. The dust removal device according to claim 1, characterized in that: The ash inlet end of the constant pressure tank (1) is connected to a one-way valve (16), and the one-way valve (16) is used to limit the powder material to enter the constant pressure tank (1) only through the recovery pipe (6).

7. A method for controlling a dust removal device according to any one of claims 2 to 6, characterized in that: The steps include: S1, the control system (15) controls the first control valve (5) to open; S2, the monitoring system (12) monitors the storage volume W of the dust removal tank (2) in real time 除尘罐重量 , the data acquisition system (14) determines whether the real-time storage capacity of the dust removal tank (2) reaches the set maximum weight; S3, if the real-time storage volume of the dust removal tank (2) has not reached the set maximum weight, continue to execute S2, if the real-time storage volume of the dust removal tank (2) has reached the set maximum weight, the control system (15) controls the third control valve (8), the fourth control valve (11), and the second control valve (7) to open in sequence; S4, the control system (15) adjusts the opening of the second control valve (7); S5, the monitoring system (12) monitors the storage volume W of the dust removal tank (2) in real time 除尘罐重量 , the data acquisition system (14) determines whether the real-time storage capacity of the dust removal tank (2) reaches a set minimum weight; S6, if the real-time storage volume of the dust removal tank (2) does not reach the set minimum weight, continue to execute S5, if the real-time storage volume of the dust removal tank (2) reaches the set minimum weight, control the second control valve (7), the fourth control valve (11), and the third control valve (8) to be closed in sequence through the control system (15); S7, determining whether the dust removal operation is completed. If the dust removal operation is not completed, continuously executing S1-S6 until the dust removal operation is completed.

8. The control method according to claim 7, characterized in that: In S2, the storage value detected by one pressure detector (121) is W1, the storage value detected by the other pressure detector (121) is W2, and the storage value of the dust removal tank (2) is W 除尘罐重量 =W1+W2.

9. The control method according to claim 7, characterized in that: In S2, when the dust removal tank (2) has a storage capacity of W 除尘罐重量 When the dust removal tank (2) reaches 90% of its rated storage capacity, it is determined that the real-time storage capacity of the dust removal tank (2) has reached the set maximum weight; otherwise, it is determined that the real-time storage capacity of the dust removal tank (2) has not reached the set maximum weight.

10. The control method according to claim 7, characterized in that: In S4, the data acquisition system (14) compares the set storage capacity and the actual storage capacity of the dust removal tank (2), and adjusts the opening degree of the second control valve (7) in real time through the control system (15), and uses the formula: Calculate the opening of the second control valve (7), e(k) is the deviation between the current set storage and the actual storage, e(k-1) is the deviation at k-1, K p , K i , K d are the proportional coefficient, integral coefficient and differential coefficient respectively.

11. The control method according to claim 7, characterized in that: In S5, when the dust removal tank (2) has a storage capacity W 除尘罐重量 When the dust removal tank (2) reaches 10% of its rated storage capacity, it is determined that the real-time storage capacity of the dust removal tank (2) has reached the set minimum weight; otherwise, it is determined that the real-time storage capacity of the dust removal tank (2) has not reached the set minimum weight.

12. The control method according to claim 7, characterized in that: In S6, after the second control valve (7) is closed, the fourth control valve (11) and the third control valve (8) are closed in sequence after a delay of 20 seconds to achieve back-purge of the recovery pipeline (6).

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