Low-dry-ash-loss stable ash supply equipment for well cementation construction and control method

Abstract

The invention relates to stable ash supply equipment for well cementation construction with low dry ash loss and a control method, the ash supply equipment comprises a tank body, a cleaning mechanism, a detector I, a detector II and a controller, the bottom of the tank body is provided with an ash outlet which is through inside and outside, and an ash outlet valve is fixedly mounted at the ash outlet; the first detector is fixedly installed at the ash outlet and used for detecting the ash outlet amount at the ash outlet. The detector II is fixedly mounted on the top wall in the tank body and is used for detecting the position of an ash surface in the tank body; the cleaning mechanism is used for cleaning dry ash adhering to the inner wall of the tank body, and the ash outlet valve, the cleaning mechanism, the first detector and the second detector are in communication connection with the controller. The device has the beneficial effects that the structure is simple, the design is reasonable, the amount of residual ash in the tank body and the amount of output ash can be achieved, stable ash supply and timely tank cutting during construction are guaranteed, and the use efficiency of dry ash is guaranteed; in addition, dry ash on the inner wall of the tank body is convenient to clean, manpower is saved, and material waste is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploration and development equipment, and in particular to a low dry ash loss cementing construction stable ash supply equipment and a control method. Background Art

[0002] Cementing is an important engineering link in oil and gas exploration and development. The casing-cement ring wellbore system formed by it is the core asset of the oil field. During the cementing construction process, cement slurry needs to be mixed at the well site and injected into the well at the same time. The construction team usually needs to store the dry ash used for slurry mixing in a vertical ash tank and transport it to the well site. During construction, the cement is transported from the vertical ash tank to the slurry mixing system through the ash delivery pipeline by a compressor. The slurry is mixed into cement slurry by the slurry mixing system and injected into the wellbore. The density of cement slurry is the most important indicator in cementing construction, and stable ash supply is a necessary condition for the stability of slurry density. The existing vertical ash tank generally inputs a constant pressure into the tank through an air compressor, presses the dry ash out of the ash tank and transmits it to the slurry mixing equipment. When the vertical ash tank is pressurized to output dry ash, with the reduction of the amount of dry cement ash in the tank and the complex movement of the dry ash in the tank, the dry ash is easy to accumulate near the tank wall and cannot be output, which will cause the ash delivery rate to slow down, resulting in uneven density of cement slurry mixed by the cement truck. In order to solve the problem of dry ash accumulation on the tank wall, operators are often required to use a rubber hammer to knock around the ash tank during on-site construction to shake off the remaining ash on the tank wall, which increases construction risks; the remaining dry ash in the tank generally cannot be reused and will be cleaned up as waste, increasing construction losses and construction costs. At the same time, it will also increase additional transportation costs and ash tank cleaning workload, and waste ash treatment is difficult.

[0003] At present, the cementing ash tank in the existing technology has the following defects: 1. It is impossible to monitor the remaining ash amount in the tank and the output ash amount, and it is impossible to ensure stable ash supply during construction; 2. Although the technology realizes stable ash supply based on ash tank switching, it is possible to cut the tank when there is sufficient remaining ash in the tank but the ash supply is not smooth, resulting in low efficiency in the use of dry ash. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a stable ash supply equipment and a control method for cementing construction with low dry ash loss, aiming to solve the problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A stable ash supply equipment for cementing construction with low dry ash loss comprises a tank body, a cleaning mechanism, a first detector, a second detector and a controller, wherein the bottom of the tank body is provided with an ash outlet penetrating inside and outside, and an ash outlet valve is fixedly installed at the ash outlet; the first detector is fixedly installed at the ash outlet, and is used to detect the ash output at the ash outlet; the second detector is fixedly installed on the top wall inside the tank body, and is used to detect the position of the ash surface inside the tank body; the cleaning mechanism is used to clean the dry ash adhered to the inner wall of the tank body, and the ash outlet valve, the cleaning mechanism, the first detector and the second detector are respectively communicatively connected with the controller.

[0007] The beneficial effects of the present invention are as follows: during the ash supply process, the ash outlet valve is opened to supply ash; during this process, the detector 1 detects the ash outlet amount at the ash outlet, and the detector 2 detects the position of the ash surface in the tank body, the detector 1 and the detector 2 respectively send corresponding signals to the controller, the controller respectively receives the corresponding signals and makes judgments and analyses, and the controller timely closes the ash outlet valve according to the judgment results to perform the tank cutting operation;

[0008] During the ash supply process, the dry ash adhering to the inner wall of the tank can also be cleaned by the cleaning mechanism. The dry ash on the inner wall of the tank is easy to clean, which saves manpower and avoids material waste.

[0009] The invention has a simple structure and a reasonable design, and can realize the amount of residual ash in the tank body and the amount of output ash, thereby ensuring stable ash supply during construction, timely cutting of the tank, and ensuring efficient use of dry ash.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the detector 1 is a solid flow meter.

[0012] The beneficial effect of adopting the above further scheme is that during the ash supply process, the ash output at the ash outlet is detected in real time by the solid flow meter, and the corresponding signal is sent to the controller. The controller receives the corresponding signal and makes a judgment and analysis. The controller closes the ash outlet valve in time according to the result of the judgment to perform the tank cutting operation, which facilitates the ash supply.

[0013] Furthermore, the second detector is an ultrasonic rangefinder.

[0014] The beneficial effect of adopting the above further scheme is that during the ash supply process, the position of the ash surface in the tank body is detected in real time by an ultrasonic rangefinder, and the corresponding signal is sent to the controller. The controller receives the corresponding signal and makes a judgment and analysis. The controller closes the ash outlet valve in time according to the result of the judgment to perform the tank cutting operation, which facilitates the ash supply.

[0015] Furthermore, the cleaning mechanism includes an air supply pipeline and at least one cleaning unit, the cleaning unit is fixedly mounted on the tank body and is connected to the interior of the tank body; one end of the air supply pipeline is connected to the corresponding cleaning unit, and the other end is used to connect to the air source, and an air supply valve is fixedly mounted on the air supply pipeline, and the air supply valve is connected to the controller.

[0016] The beneficial effect of adopting the above-mentioned further scheme is that during the ash supply process, the gas source sends the gas to the cleaning unit through the gas supply pipeline. After the gas reaches the cleaning unit, it enters the tank body and blows away the gas adhering to the inner wall of the tank body to clean up the dry ash adhering to the inner wall of the tank body. The dry ash cleaning is convenient, manpower is saved, and material waste is avoided.

[0017] Furthermore, the cleaning mechanism also includes an air compressor, which is communicatively connected to the controller; an air outlet of the air compressor is connected to the other end of the air supply pipeline through a pipeline.

[0018] The beneficial effect of adopting the above further scheme is that during the ash supply process, the air compressor sends gas to the cleaning unit through the gas supply pipeline, and the gas in the cleaning unit enters the tank body and blows the gas adhering to the inner wall of the tank body to clean up the dry ash adhering to the inner wall of the tank body, which is convenient for cleaning dry ash, saves manpower and avoids material waste;

[0019] The air compressor is selected reasonably. The gas delivered by the air compressor has a certain impact force, which can better clean the dry ash on the inner wall of the tank.

[0020] Furthermore, the cleaning mechanism includes a plurality of cleaning units, and the plurality of cleaning units are fixedly installed on the tank body at even intervals from top to bottom, and two adjacent cleaning units are connected by pipelines.

[0021] The beneficial effect of adopting the above further scheme is that the number of cleaning units is reasonably set and the cleaning units are reasonably distributed, which further ensures the effect of cleaning the dry ash on the inner wall of the tank body.

[0022] Furthermore, the cleaning mechanism includes two cleaning units.

[0023] The beneficial effect of adopting the above further solution is that the number of cleaning units is reasonably set, which can save costs and ensure the effect of cleaning dry ash on the inner wall of the tank body.

[0024] Furthermore, each of the cleaning units includes a cleaning pipeline, which is fixedly mounted outside the tank body and has a plurality of air holes evenly spaced along its length on one side close to the tank body; and a plurality of air jets evenly spaced on the tank body that correspond one to one and are connected to the plurality of air holes.

[0025] The beneficial effect of adopting the above further scheme is that during the ash supply process, the air compressor sends gas to the cleaning pipeline through the air supply pipeline, and the gas in the cleaning pipeline enters the tank body through multiple air holes and multiple air jets to purge the gas adhering to the inner wall of the tank body, so as to clean up the dry ash adhering to the inner wall of the tank body, which is convenient for cleaning dry ash, saves manpower and avoids material waste;

[0026] The cleaning pipeline has a reasonable structural design, which can evenly deliver the gas to various parts of the tank body, achieving a better cleaning effect.

[0027] Furthermore, the air supply valve and / or the ash discharge valve are solenoid valves, and each of the solenoid valves is communicatively connected to the controller.

[0028] The beneficial effect of adopting the above further scheme is that the air supply valve and the ash discharge valve are electromagnetic valves with reasonable design, high degree of automation, more convenient operation and high efficiency.

[0029] The present invention also relates to a control method for a stable ash supply equipment for cementing construction with low dry ash loss as described above, comprising the following specific steps:

[0030] Open the ash discharge valve, and the dry ash in the tank is discharged from the ash discharge port to carry out ash supply operation;

[0031] In this process, the detector 1 obtains the ash output at the ash outlet, and the detector 2 obtains the position of the ash surface in the tank body, and sends corresponding signals to the controller respectively. The controller receives the corresponding signals and performs judgment and analysis.

[0032] When the ash discharge amount and the height change of the ash surface are close to zero for the first time within the set time step (1 second ≤ t ≤ 4 seconds), the cleaning mechanism is turned on to clean the ash adhered to the inner wall of the tank body. During this process, the ash discharge valve is continuously opened to perform the ash supply operation;

[0033] When the ash discharge amount and the height change of the ash surface approach zero for the second time within the set time step (1 second≤t≤4 seconds), the cleaning mechanism and the ash discharge valve are closed and the ash supply operation of the tank is stopped.

[0034] The beneficial effect of adopting the above-mentioned further scheme is that the present invention provides a control method for dry ash supply. The control method has a simple structure and a reasonable design. It can realize the remaining ash amount in the tank body and the output ash amount, ensure stable ash supply during construction, cut the tank in time, and ensure the efficiency of dry ash use; in addition, the dry ash on the inner wall of the tank is easy to clean, which saves manpower and avoids material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a control flow chart of the present invention.

[0037] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0038] 1. Tank body; 2. Controller; 3. Ash outlet; 4. Solid flow meter; 5. Ultrasonic rangefinder; 6. Air supply pipeline; 7. Air supply valve; 8. Air compressor; 9. Cleaning pipeline; 10. Jet outlet; 11. Support foot. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0043] Example 1

[0044] like Figure 1As shown, this embodiment provides a stable ash supply equipment for cementing construction with low dry ash loss, including a tank body 1, a detector 1, a detector 2 and a controller 2. The bottom of the tank body 1 is provided with an ash outlet 3 which penetrates inside and outside, and an ash outlet valve is fixedly installed at the ash outlet 3; the detector 1 is fixedly installed at the ash outlet 3, and is used to detect the ash output at the ash outlet 3; the detector 2 is fixedly installed on the top wall inside the tank body 1, and is used to detect the position of the ash surface inside the tank body 1; the detector 1 and the detector 2 are respectively connected to the controller 2 for communication.

[0045] During the ash supply process, the ash outlet valve is opened to supply ash; during this process, detector 1 detects the ash output at the ash outlet 3, and detector 2 detects the position of the ash surface in the tank body 1. Detector 1 and detector 2 respectively send corresponding signals to controller 2, which receives the corresponding signals and makes judgments and analyses. Controller 2 closes the ash outlet valve in a timely manner according to the judgment results to perform the tank cutting operation.

[0046] Preferably, in this embodiment, a plurality of supporting legs 11 are evenly spaced and vertically fixedly mounted on the bottom of the tank body 1 .

[0047] In addition, the plurality of supporting legs 11 are respectively in an inverted T-shaped structure, which is reasonably designed to further ensure the overall stability of the tank body 1 .

[0048] Preferably, in this embodiment, the tank body 1 is a cylindrical structure, and its bottom is a conical structure, the ash outlet 3 is located at the center of the bottom of the tank body 1 , and the ash outlet 3 is located in the area surrounded by a plurality of support legs 11 .

[0049] It should be noted that the controller 2 mentioned above adopts the existing technology, and its specific structure and principle will not be described in detail here.

[0050] In addition, the controller 2 can be a control panel, or other types of control terminals, such as a single chip microcomputer, a mobile phone, and a computer.

[0051] This embodiment has a simple structure and a reasonable design, and can realize the amount of remaining ash in the tank and the amount of output ash, thereby ensuring a stable ash supply during construction, cutting the tank in time, and ensuring efficient use of dry ash.

[0052] Example 2

[0053] On the basis of Example 1, in this example, the detector 1 is a solid flow meter 4, and the flow meter 4 is connected to the controller 2 through a line.

[0054] During the ash supply process, the ash output at the ash outlet 3 is detected in real time through the solid flow meter 4, and the corresponding signal is sent to the controller 2. The controller 2 receives the corresponding signal and makes a judgment and analysis. The controller 2 closes the ash outlet valve in time according to the result of the judgment to perform the tank cutting operation, which facilitates the ash supply.

[0055] It should be noted that the above-mentioned solid flowmeter 4 adopts the existing technology, and its specific structure and principle are not described in detail here.

[0056] Example 3

[0057] On the basis of Example 1, in this embodiment, the second detector is an ultrasonic rangefinder 5 .

[0058] During the ash supply process, the ultrasonic rangefinder 5 detects the position of the ash surface in the tank body 1 in real time, and sends the corresponding signal to the controller 2. The controller 2 receives the corresponding signal and makes a judgment and analysis. The controller 2 closes the ash outlet valve in time according to the result of the judgment to perform the tank cutting operation, which facilitates the ash supply.

[0059] It should be noted that the ultrasonic rangefinder 5 adopts the existing technology, and its specific structure and principle are not described in detail here.

[0060] Based on the above scheme, the solid flow meter 4 and the ultrasonic rangefinder 5 are preferably provided at the same time, so as to accurately detect the ash amount in the tank body 1 and cut the tank in time.

[0061] Alternatively, the solid flow meter 4 and the ultrasonic distance meter 5 may be provided selectively, but this solution cannot detect when the solid flow meter 4 or the ultrasonic distance meter 5 fails.

[0062] Example 4

[0063] On the basis of the above embodiments, this embodiment further includes a cleaning mechanism, which is communicatively connected to the controller 2 and is used to clean dry ash adhered to the inner wall of the tank body 1 .

[0064] During the ash supply process, the dry ash adhering to the inner wall of the tank body 1 can be cleaned by the cleaning mechanism. The dry ash on the inner wall of the tank body 1 is easy to clean, which saves manpower and avoids material waste.

[0065] Alternatively, the dry ash on the inner wall of the tank body 1 can be cleaned manually, for example, by manually hitting the outer wall of the tank body 1 with a hammer and using the vibration of the tank body 1 to clean the dry ash on the inner wall of the tank body 1. However, this solution has high labor costs and is time-consuming and labor-intensive.

[0066] Example 5

[0067] On the basis of Example 4, in this embodiment, the cleaning mechanism includes an air supply pipeline 6 and at least one cleaning unit, and the cleaning unit is fixedly installed on the tank body 1 and is connected to the tank body 1; one end of the air supply pipeline 6 is connected to the corresponding cleaning unit, and the other end is used to connect to the air source, and an air supply valve 7 is fixedly installed on the air supply pipeline 6, and the air supply valve 7 is connected to the controller 2.

[0068] During the ash supply process, the gas source delivers the gas to the cleaning unit via the gas supply pipeline 6. After the gas reaches the cleaning unit, it enters the tank body 1 and blows the gas adhering to the inner wall of the tank body 1 to clean up the dry ash adhering to the inner wall of the tank body 1. The dry ash cleaning is convenient, saves manpower and avoids material waste.

[0069] Example 6

[0070] On the basis of Example 5, in this embodiment, the cleaning mechanism further includes an air compressor 8, and the air compressor 8 is communicatively connected to the controller 2; the air outlet of the air compressor 8 is connected to the other end of the air supply pipeline 6 through a pipeline.

[0071] During the ash supply process, the air compressor 8 delivers the gas to the cleaning unit through the gas supply pipeline 6. After the gas in the cleaning unit enters the tank body 1, it blows the gas adhering to the inner wall of the tank body 1 to clean up the dry ash adhering to the inner wall of the tank body 1. The dry ash cleaning is convenient, manpower is saved, and material waste is avoided.

[0072] The air compressor 8 is selected reasonably, and the gas delivered by the air compressor 8 has a certain impact force, which can better clean the dry ash on the inner wall of the tank body 1, and the cleaning effect is better.

[0073] Example 7

[0074] On the basis of any one of Examples 5 to 6, in this embodiment, the cleaning mechanism includes a plurality of cleaning units, and the plurality of cleaning units are fixedly installed on the tank body 1 at even intervals from top to bottom, and two adjacent cleaning units are connected by pipelines.

[0075] The number of cleaning units is reasonably set, and the cleaning units are reasonably distributed, which further ensures the effect of cleaning the dry ash on the inner wall of the tank body 1.

[0076] Preferably, in this embodiment, the cleaning mechanism includes two cleaning units, and the number of cleaning units is reasonably set, which can save costs and ensure the effect of cleaning dry ash on the inner wall of the tank body.

[0077] Example 8

[0078] On the basis of any one of Examples 5 to 7, in this embodiment, each of the cleaning units includes a cleaning pipeline 9, which is fixedly mounted on the tank body 1, and has a plurality of air holes evenly spaced along its length direction on one side close to the tank body 1; and a plurality of air jets 10 are evenly spaced on the tank body 1, which correspond to and are connected to the plurality of air holes one by one.

[0079] During the ash supply process, the air compressor 8 delivers gas to the cleaning pipeline 9 through the air supply pipeline 6. The gas in the cleaning pipeline 9 enters the tank body 1 through multiple air holes and multiple air jets 10 to purge the gas adhering to the inner wall of the tank body 1, so as to clean up the dry ash adhering to the inner wall of the tank body 1. The dry ash cleaning is convenient, manpower is saved, and material waste is avoided.

[0080] The cleaning pipeline 9 has a reasonable structural design and can evenly deliver the gas to various parts of the tank body 1, resulting in a better cleaning effect.

[0081] Preferably, in this embodiment, the cleaning pipeline 9 is preferably an annular pipeline, the shape of which matches the shape of the tank body 1 and embraces the tank body 1 to facilitate cleaning of dry ash on the inner wall of the tank body 1.

[0082] Alternatively, the cleaning pipeline 9 may also adopt other suitable shapes, such as a frame shape, in which case an annular groove may be provided on the inner side of the frame-shaped tube to embrace the tank body 1 .

[0083] Preferably, in this embodiment, the plurality of air holes and the plurality of air jets 10 are preferably circular holes, but rectangular holes may also be used.

[0084] The principle of cementing construction in this embodiment is specifically as follows:

[0085] At the beginning of cementing construction, the air compressor and controller are first started, and the monitoring time step is set in the controller. After receiving the operator's instructions, the ash outlet valve is opened and the solid flow meter is started through the controller, and the ash output and the residual ash height in the tank are recorded at the same time until the construction is completed; during the construction process, the control program in the controller will continue to calculate the change in the ash output and the residual ash height in the tank per unit time. When the double changes are monitored to be close to zero at the same time for the first time, it means that the ash output does not meet the construction requirements. The controller sends a signal to open the tank body vertical air supply valve, and air is ejected from the tank body vertical air jet to blow away the accumulated residual ash on the vertical surface, and continue to ensure constant pressure in the tank; after the tank body vertical air supply valve is opened, the change is continuously calculated. When the second change is monitored to be close to zero, it means that the dry ash cannot be stably output according to the construction requirements. The air compressor is stopped and the ash outlet valve and the solid flow meter are closed, and then a construction end signal is issued.

[0086] Example 9

[0087] On the basis of any one of Examples 5 to 8, in this embodiment, the air supply valve 7 and / or the ash discharge valve is a solenoid valve, and each of the solenoid valves is communicatively connected to the controller 2.

[0088] The air supply valve and ash discharge valve are solenoid valves with reasonable design, high degree of automation, more convenient operation and high efficiency.

[0089] Preferably, in this embodiment, the air compressor 8 is diesel-driven. The diesel engine can supply power to the ash outlet valve, air supply valve, solid flow meter 4, ultrasonic rangefinder 5 and controller 2 while ensuring the pressure inside the tank body 1. No additional power supply is required, and the operation is convenient.

[0090] Example 10

[0091] Based on the above embodiments, Figure 2 As shown, this embodiment also provides a control method for stable ash supply equipment in cementing construction with low dry ash loss as described above, including the following specific steps:

[0092] Turn on the air compressor 8 and the controller 2, set the time step at the same time, and then open the ash discharge valve, and the dry ash in the tank body 1 is discharged from the ash discharge port 3 to perform the ash supply operation;

[0093] In this process, the detector 1 obtains the ash output at the ash outlet 3, and the detector 2 obtains the position of the ash surface in the tank 1, and sends corresponding signals to the controller 2 respectively. The controller 2 receives the corresponding signals and makes judgments and analyses.

[0094] When the ash discharge amount and the height change of the ash surface are close to zero for the first time within the set time step (1 second ≤ t ≤ 4 seconds), the cleaning mechanism is turned on to clean the ash adhering to the inner wall of the tank body 1. During this process, the ash discharge valve is continuously opened to perform the ash supply operation;

[0095] When the ash discharge amount and the height change of the ash surface approach zero for the second time within the set time step (1 second≤t≤4 seconds), the cleaning mechanism and the ash discharge valve are closed and the ash supply operation of the tank body 1 is stopped.

[0096] The ash output and the height change of the ash surface are close to zero at the same time within the set time step, which means that the ash output difference is less than 10g / s (grams / second) and the dry ash height change difference in the tank is less than 2cm / s (centimeter / second).

[0097] The present embodiment provides a control method for dry ash supply. The control method has a simple structure and a reasonable design. It can realize the remaining ash amount in the tank body and the output ash amount, ensure stable ash supply during construction, cut the tank in time, and ensure the efficiency of dry ash use. In addition, the dry ash on the inner wall of the tank body is easy to clean, which saves manpower and avoids material waste.

[0098] Based on the above scheme, the controller 2 is preferably a control panel. Before the ash supply operation is performed, the time step can be manually set through the control panel.

[0099] The control method of the present invention is as follows:

[0100] 1. The controller is manually controlled by the operator or receives external control signals for control;

[0101] 2. The air compressor providing the air source for the device and the ash outlet connected to the slurry mixing system are started by a start signal sent by the controller;

[0102] 3. After the ash outlet is opened, the solid flow meter and ultrasonic rangefinder equipped at the ash outlet are started at the same time, and the ash discharge volume and the lowest height of the residual ash in the tank are recorded according to the set time step;

[0103] 4. After receiving the gray opening signal from the monitoring station, from the second unit time step until the end of construction, the flow rate and height change are calculated by the following formulas for each time step:

[0104]

[0105] Where: r t is the current time step reading, r t-1 is the reading of the previous time step, and t is the time step;

[0106] 5. When the flow rate change and height change are monitored to be close to zero for the first time, open the air supply valve of the annular air pipe surrounding the tank facade to blow away the dust accumulated near the tank facade;

[0107] 6. The air supply of the annular air pipe is kept open. When the flow change and height change are detected to be close to zero for the second time, the air compressor and ash discharge valve are turned off and a signal that the tank is empty is issued. If the construction is not completed, open the next ash tank and repeat the above process until the construction is completed.

[0108] Stable dry ash delivery is one of the necessary conditions to ensure the stability of cement slurry density during cementing construction. Excessive ash remaining in the cementing construction ash tank will increase the cost of the entire cementing construction. Construction workers often need to knock on the ash tank, which increases the construction risk. The present invention provides a device and method for stable ash supply with low dry ash loss, which does not require additional power supply, ensures stable ash supply, reduces dry ash loss and improves the safety of construction workers.

[0109] It should be noted that all electronic components involved in the present invention adopt the existing technology, and the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is the existing technology.

[0110] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0111] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stable ash supply equipment for cementing construction with low dry ash loss, characterized by: The invention comprises a tank body (1), a cleaning mechanism, a detector 1, a detector 2 and a controller (2); the bottom of the tank body (1) is provided with an ash outlet (3) penetrating inside and outside, and an ash outlet valve is fixedly installed at the ash outlet (3); the detector 1 is fixedly installed at the ash outlet (3) and is used to detect the ash outlet amount at the ash outlet (3); the detector 2 is fixedly installed on the top wall of the tank body (1) and is used to detect the position of the ash surface in the tank body (1); the cleaning mechanism is used to clean dry ash adhered to the inner wall of the tank body (1); the ash outlet valve, the cleaning mechanism, the detector 1 and the detector 2 are respectively connected to the controller (2) for communication.

2. The low dry ash loss and stable ash supply equipment for cementing construction according to claim 1 is characterized by: The detector 1 is a solid flow meter (4).

3. The low dry ash loss and stable ash supply equipment for cementing construction according to claim 1 is characterized by: The second detector is an ultrasonic rangefinder (5).

4. The low dry ash loss stable ash supply equipment for cementing construction according to any one of claims 1 to 3, characterized in that: The cleaning mechanism comprises an air supply pipeline (6) and at least one cleaning unit, wherein the cleaning unit is fixedly mounted on the tank body (1) and is connected to the interior of the tank body (1); one end of the air supply pipeline (6) is connected to the corresponding cleaning unit, and the other end is used to connect to an air source; an air supply valve (7) is fixedly mounted on the air supply pipeline (6), and the air supply valve (7) is connected to the controller (2).

5. The low dry ash loss and stable ash supply equipment for cementing construction according to claim 4 is characterized by: The cleaning mechanism also includes an air compressor (8), which is communicatively connected to the controller (2); the air outlet of the air compressor (8) is connected to the other end of the air supply pipeline (6) through a pipeline.

6. The low dry ash loss stable ash supply equipment for cementing construction according to claim 4 is characterized by: The cleaning mechanism comprises a plurality of cleaning units, which are fixedly mounted on the tank body (1) at even intervals from top to bottom, and two adjacent cleaning units are connected via pipelines.

7. The low dry ash loss stable ash supply equipment for cementing construction according to claim 6 is characterized by: The cleaning mechanism comprises two cleaning units.

8. The low dry ash loss and stable ash supply equipment for cementing construction according to claim 4 is characterized by: Each of the cleaning units comprises a cleaning pipeline (9), the cleaning pipeline (9) being fixedly sleeved outside the tank body (1), and having a plurality of air holes evenly spaced along its length direction on one side close to the tank body (1); and a plurality of air jets (10) evenly spaced on the tank body (1) corresponding to and connected to the plurality of air holes.

9. The low dry ash loss and stable ash supply equipment for cementing construction according to claim 4 is characterized by: The air supply valve (7) and / or the ash discharge valve are solenoid valves, and each of the solenoid valves is communicatively connected to the controller (2).

10. A control method for a stable ash supply equipment for cementing construction with low dry ash loss according to any one of claims 1 to 9, characterized in that: The specific steps include: The ash discharge valve is opened, and the dry ash in the tank body (1) is discharged from the ash discharge port (3) to carry out the ash supply operation; During this process, the detector 1 obtains the ash output at the ash outlet (3), and the detector 2 obtains the position of the ash surface in the tank body (1), and sends corresponding signals to the controller (2), and the controller (2) receives the corresponding signals and performs judgment and analysis; When the ash discharge amount and the height change of the ash surface approach zero for the first time within the set time step t, the cleaning mechanism is turned on to clean the ash adhering to the inner wall of the tank body (1), and during this process, the ash discharge valve is continuously opened to perform the ash supply operation; When the ash discharge amount and the height change of the ash surface approach zero for the second time simultaneously within the set time step t, the cleaning mechanism and the ash discharge valve are closed and the ash supply operation of the tank body (1) is stopped.

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