Lock hopper device and pulverized coal gasification system
By setting up a buffer container and compressor in the locking bucket device, the gas in the pressure relief stage is recovered and reused, the problem of large amount of air discharge in the locking bucket device is solved, efficient utilization of gas is achieved, and energy consumption and dust pollution are reduced. .
Patent Information
- Application Number
- CN202420083654.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-12
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-01-12
AI Technical Summary
The existing locking device has a large amount of air discharge during the pressure relief process, and the air discharge cannot be reused, resulting in waste of energy and high operating costs.
A locking device including a buffer container and a compressor is designed to ensure full utilization of gas in the buffer container and a constant charging and pressure charging under the uniform pressure state by recovering and unloading gas during the pressure relief phase and reusing it in the charging and pressure setting. .
It improves the reuse rate of gas, saves energy consumption and operating costs, and reduces the amount of gas discharge and dust pollution.
Smart Images
Figure CN222274476U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical industry, in particular to a locking bucket device and a pulverized coal gasification system. Background Art
[0002] Pressurized transfer and depressurized discharge of powder are common steps in the entrained-flow dry pulverized coal gasification process. The transfer of powder from high pressure to low pressure or from low pressure to high pressure usually uses a lock hopper.
[0003] The lock bucket is a pressure alternating container. The lock bucket connects the low-pressure container and the high-pressure container at the same time, and completes the transportation of powder between low pressure and high pressure by charging and releasing pressure. Taking the transfer from low pressure to high pressure as an example, the lock bucket realizes the pressurization of powder through the cycle of "collecting material-charging-discharging-pressure relief-collecting material". Each cycle includes a pressure relief process, but the amount of gas discharged during the pressure relief process is large, and the discharged gas cannot be reused, resulting in energy waste and high operating costs. Utility Model Content
[0004] The embodiments of the utility model provide a locking bucket device and a pulverized coal gasification system, which can solve the problems of large gas discharge volume in the existing locking bucket pressure relief process, inability to reuse the discharged gas, resulting in energy waste and high operating costs.
[0005] In a first aspect, an embodiment of the utility model provides a bucket locking device, comprising:
[0006] At least one lock bucket assembly, the lock bucket assembly comprising a lock bucket body;
[0007] A buffer container, comprising an air inlet and an air outlet, wherein the air inlet is connected to the lock bucket body, and the air outlet is connected to the lock bucket body through a first pressure charging pipeline; and
[0008] The compressor is arranged on the first charging pipeline.
[0009] In one embodiment, the lock bucket assembly comprises:
[0010] A pressure relief pipeline, one end of which is connected to the lock bucket body;
[0011] A buffer branch, the two ends of which are respectively connected to the air inlet and an end of the pressure relief pipeline away from the lock bucket body;
[0012] A venting branch, one end of which is connected to an end of the pressure relief pipeline away from the lock bucket body;
[0013] a buffer valve, arranged on the buffer branch; and
[0014] The vent valve is arranged on the vent branch line.
[0015] In one embodiment, the lock bucket assembly further comprises:
[0016] A first flow limiting plate is disposed in the buffer branch, the first flow limiting plate is located on a side of the buffer valve away from the pressure relief pipeline; and
[0017] A second flow limiting plate is arranged in the vent branch, and the second flow limiting plate is located on a side of the vent valve away from the pressure relief pipeline;
[0018] Wherein, a plurality of flow limiting holes are arranged on the first flow limiting plate and the second flow limiting plate.
[0019] In one embodiment, the lock bucket assembly further includes a filter, and the filter is disposed on the pressure relief pipeline.
[0020] In one embodiment, the first charging circuit comprises:
[0021] a main pipeline, one end of which is connected to the buffer container and the other end of which is connected to the compressor; and
[0022] At least one charging branch, at least one of the charging branches corresponds to at least one of the locking bucket assemblies, one end of the charging branch is connected to the compressor, and the other end is connected to the locking bucket body of the corresponding locking bucket assembly.
[0023] In one embodiment, the lock bucket assembly further includes a pressure charging valve, and the pressure charging valve is arranged on the pressure charging branch line.
[0024] In one embodiment, the lock bucket assembly further comprises:
[0025] A low-pressure container is connected to the lock bucket body through a first delivery pipeline;
[0026] A high-pressure container is connected to the lock bucket body through a second delivery pipeline;
[0027] A first delivery valve, disposed on the first delivery pipeline; and
[0028] The second delivery valve is arranged on the second delivery pipeline.
[0029] In one embodiment, the lock bucket assembly further comprises:
[0030] A pressurizing part, connected to the lock bucket body through a second pressurizing pipeline; and
[0031] The pressurizing valve is arranged on the second pressure charging pipeline.
[0032] In a second aspect, an embodiment of the utility model provides a pulverized coal gasification system, comprising the locking bucket device as described above.
[0033] Compared with the prior art, the advantage of the embodiment of the utility model lies in that a buffer container is provided to recover the discharged gas of the lock bucket body, and the discharged gas is recovered in the pressure relief stage when the powder is transferred from high pressure to low pressure, and the recovered discharged gas is reused by the compressor. In the charging stage when the powder is transferred from low pressure to high pressure, the recovered discharged gas is used to pressurize the lock bucket, thereby ensuring the full utilization of the discharged gas in the buffer container, and the pressurization can continue when the buffer container and the lock bucket body are in a balanced pressure state, thereby improving the reuse rate of the gas, effectively saving energy consumption and operating costs, and solving the problem that the existing discharged gas cannot be reused, resulting in energy waste and high operating costs. At the same time, the amount of discharged gas is reduced, thereby reducing the pollution to the environment caused by the dust carried in the discharged gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.
[0035] Figure 1 It is a structural schematic diagram of a bucket locking device provided in one embodiment of the utility model.
[0036] Reference numerals:
[0037] 10. Lock bucket assembly; 110. Lock bucket body; 120. Pressure relief pipeline; 130. Buffer branch; 140. Vent branch; 150. Buffer valve; 160. Vent valve; 170. First flow limiting plate; 180. Second flow limiting plate; 190. Filter; 191. Pressurizing valve; 192. Low-pressure container; 193. High-pressure container; 194. First delivery valve; 195. Second delivery valve; 196. Pressurizing valve; 197. Pressurizing part;
[0038] 20. Buffer container; 210. First pressure charging pipeline; 2101. Main pipeline; 2102. Pressure charging branch pipeline;
[0039] 30. Compressor. DETAILED DESCRIPTION
[0040] The utility model will be further described below in conjunction with the accompanying drawings.
[0041] The lock bucket is a pressure alternating container. The lock bucket connects the low-pressure container and the high-pressure container at the same time, and completes the transportation of powder between low pressure and high pressure by charging and releasing pressure. Taking the transfer from low pressure to high pressure as an example, the lock bucket realizes the pressurization of powder through the cycle of "collecting material-charging-discharging-pressure relief-collecting material". Each cycle includes a pressure relief process, but the amount of gas discharged during the pressure relief process is large, and the discharged gas cannot be reused, resulting in energy waste and high operating costs.
[0042] In order to solve the above-mentioned technical problems, at least one embodiment of the utility model provides a locking bucket device, including at least one locking bucket assembly 10, a buffer container 20 and a compressor 30; the locking bucket assembly 10 includes a locking bucket body 110; the buffer container 20 includes an air inlet and an air outlet, the air inlet is connected to the locking bucket body 110, and the air outlet is connected to the locking bucket body 110 through a first charging pipeline 210; the compressor 30 is arranged on the first charging pipeline 210.
[0043] As can be seen from the above, by arranging the buffer container 20 to recover the discharged gas of the lock bucket body 110, the discharged gas is recovered during the pressure relief stage when the powder is transferred from high pressure to low pressure, and the recovered discharged gas is reused by the compressor 30. During the pressurization stage when the powder is transferred from low pressure to high pressure, the lock bucket is pressurized using the recovered discharged gas, thereby ensuring that the discharged gas in the buffer container 20 is fully utilized. When the buffer container 20 and the lock bucket body 110 are in a pressure-equalizing state, the pressurization can continue, thereby improving the reuse rate of the gas, effectively saving energy consumption and operating costs, and solving the problem that the existing discharged gas cannot be reused, resulting in energy waste and high operating costs. At the same time, the amount of discharged gas is reduced, thereby reducing the pollution to the environment caused by the dust carried in the discharged gas.
[0044] It should be noted that the compressor 30 includes but is not limited to a reciprocating compressor 30 , which refers to a compressor 30 that achieves gas pressurization and transportation by causing the cylinder volume to change periodically through the reciprocating motion of a piston or a diaphragm in the cylinder.
[0045] It should also be noted that the number of the lock bucket assembly 10 can be one or more. When the number of the lock bucket assembly 10 is more than one, the air inlet and the air outlet are respectively connected to each lock bucket body 110, and the multiple lock bucket assemblies 10 are connected in parallel, and the multiple lock bucket assemblies 10 share a buffer container 20 and a compressor 30; when one lock bucket body 110 is depressurized, at least one lock bucket is pressurized. For example, the number of the lock bucket assemblies 10 is two, and the two lock bucket assemblies 10 are connected in parallel. The two lock bucket assemblies share a buffer container 20 and a compressor 30 to realize the recycling of the discharged gas. When one lock bucket body 110 is depressurized, the other lock bucket is pressurized.
[0046] like Figure 1 As shown, the locking bucket device includes at least one locking bucket assembly 10, a buffer container 20 and a compressor 30; the locking bucket assembly 10 includes a locking bucket body 110; the buffer container 20 includes an air inlet and an air outlet, the air inlet is connected to the locking bucket body 110, and the air outlet is connected to the locking bucket body 110 through a first charging pipeline 210; the compressor 30 is arranged on the first charging pipeline 210.
[0047] As can be seen from the above, by arranging the buffer container 20 to recover the discharged gas of the lock bucket body 110, the discharged gas is recovered during the pressure relief stage when the powder is transferred from high pressure to low pressure, and the recovered discharged gas is reused by the compressor 30. During the pressurization stage when the powder is transferred from low pressure to high pressure, the lock bucket is pressurized using the recovered discharged gas, thereby ensuring that the discharged gas in the buffer container 20 is fully utilized. When the buffer container 20 and the lock bucket body 110 are in a pressure-equalizing state, the pressurization can continue, thereby improving the reuse rate of the gas, effectively saving energy consumption and operating costs, and solving the problem that the existing discharged gas cannot be reused, resulting in energy waste and high operating costs. At the same time, the amount of discharged gas is reduced, thereby reducing the pollution to the environment caused by the dust carried in the discharged gas.
[0048] It should be noted that the compressor 30 includes but is not limited to a reciprocating compressor 30 , which refers to a compressor 30 that achieves gas pressurization and transportation by causing the cylinder volume to change periodically through the reciprocating motion of a piston or a diaphragm in the cylinder.
[0049] It should also be noted that the number of the lock bucket assembly 10 can be one or more. When the number of the lock bucket assembly 10 is more than one, the air inlet and the air outlet are respectively connected to each lock bucket body 110, and the multiple lock bucket assemblies 10 are connected in parallel, and the multiple lock bucket assemblies 10 share a buffer container 20 and a compressor 30; when one lock bucket body 110 is depressurized, at least one lock bucket is pressurized. For example, the number of the lock bucket assemblies 10 is two, and the two lock bucket assemblies 10 are connected in parallel. The two lock bucket assemblies share a buffer container 20 and a compressor 30 to realize the recycling of the discharged gas. When one lock bucket body 110 is depressurized, the other lock bucket is pressurized.
[0050] In some embodiments, the lock bucket assembly 10 includes a pressure relief pipeline 120, a buffer branch 130, a vent branch 140, a buffer valve 150 and a vent valve 160; one end of the pressure relief pipeline 120 is connected to the lock bucket body 110; the two ends of the buffer branch 130 are respectively connected to the air inlet and the end of the pressure relief pipeline 120 away from the lock bucket body 110; one end of the vent branch 140 is connected to the end of the pressure relief pipeline 120 away from the lock bucket body 110; the buffer valve 150 is arranged on the buffer branch 130; the vent valve 160 is arranged on the vent branch 140.
[0051] By setting up a buffer branch 130, a vent branch 140, a buffer valve 150 and a vent valve 160, and utilizing the buffer branch 130 and the vent branch 140 in parallel, switching between buffer pressure relief and vent pressure relief is achieved. In the pressure relief stage of the lock bucket, the buffer valve 150 is opened and the vent valve 160 is closed, and the gas enters the buffer container 20 for storage to achieve buffer pressure relief. When the gas storage limit of the buffer container 20 is reached, the vent valve 160 is opened and the buffer valve 150 is closed to achieve venting pressure relief until the pressure in the lock bucket body 110 reaches a preset low pressure state.
[0052] In some embodiments, the lock bucket assembly 10 also includes a first flow limiting plate 170 and a second flow limiting plate 180; the first flow limiting plate 170 is arranged on the buffer branch 130, and the first flow limiting plate 170 is located on the side of the buffer valve 150 away from the pressure relief pipeline 120; the second flow limiting plate 180 is arranged on the vent branch 140, and the second flow limiting plate 180 is located on the side of the vent valve 160 away from the pressure relief pipeline 120; wherein, the first flow limiting plate 170 and the second flow limiting plate 180 are both provided with multiple flow limiting holes.
[0053] By setting the first limiting plate 170 and the second limiting plate 180, the noise and vibration during the pressure relief process can be reduced to avoid excessive noise and vibration. At the same time, the first limiting plate 170 and the second limiting plate 180 can avoid excessive flow, providing a structural basis for controlling the pressure relief rate and achieving orderly pressure relief.
[0054] It should be noted that the charging time and the pressure relief time are related to the volume of the lock bucket body 110, the volume of the buffer container 20, the charging rate, and the pressure relief rate. The user sets them according to actual needs. For example, the charging time and the pressure relief time are both set to not less than 3 minutes.
[0055] In some embodiments, the lock bucket assembly 10 further includes a filter 190 , and the filter 190 is disposed on the pressure relief pipeline 120 .
[0056] The filter 190 is provided to filter the dust particles carried in the discharge gas, and the filtered powder returns to the lock bucket body 110 under the action of gravity, and the filtered gas enters the buffer container 20 and the atmosphere to avoid pollution to the environment.
[0057] It should be noted that the filter 190 includes but is not limited to a bag filter.
[0058] It should also be noted that a back-blowing air structure can be set at the top of the filter 190 to back-blow the dust particles in the filter 190 when necessary, so that the dust particles return to the lock bucket body 110 under the action of gravity, while also avoiding clogging of the filter 190; the specific composition and working principle of the back-blowing air structure are all existing technologies and will not be repeated in this application.
[0059] In some embodiments, the first charging pipeline 210 includes a main pipeline 2101 and at least one charging branch pipeline 2102; one end of the main pipeline 2101 is connected to the buffer container 20 and the other end is connected to the compressor 30; at least one charging branch pipeline 2102 corresponds one-to-one to at least one lock bucket assembly 10, one end of the charging branch pipeline 2102 is connected to the compressor 30, and the other end is connected to the lock bucket body 110 of the corresponding lock bucket assembly 10.
[0060] By providing the main line 2101 and at least one charging branch line 2102 , a structural basis can be provided for the parallel connection of multiple lock bucket assemblies 10 , so that multiple lock bucket assemblies 10 can share a buffer container 20 and a compressor 30 .
[0061] It should be noted that when there are multiple lock bucket assemblies 10, there are multiple charging branches 2102, and multiple lock bucket assemblies 10 correspond one-to-one to multiple charging branches 2102. For example, when there are two lock bucket assemblies 10, there are two charging branches 2102, and two lock bucket assemblies 10 correspond one-to-one to two charging branches 2102, one end of the charging branch 2102 is connected to the compressor 30, and the other end is connected to the lock bucket body 110 of the corresponding lock bucket assembly 10.
[0062] In some embodiments, the lock bucket assembly 10 further includes a pressure charging valve 191 , and the pressure charging valve 191 is disposed on the pressure charging branch 2102 .
[0063] The charging valve 191 is provided to control the on-off of the charging branch 2102 , thereby controlling the charging process of the lock bucket body 110 corresponding to the charging branch 2102 .
[0064] It should be noted that the pressure-charging valve 191 includes but is not limited to a regulating valve; for example, the pressure-charging valve 191 is a regulating valve that controls the flow rate by adjusting the pressure difference. The specific structure and working principle of the regulating valve are prior art and will not be described in detail in this application. By setting a regulating valve as the pressure-charging valve 191, the pressure-charging rate can be controlled to achieve orderly pressure-charging and avoid excessive flow.
[0065] In some embodiments, the lock bucket assembly 10 also includes a low-pressure container 192, a high-pressure container 193, a first delivery valve 194 and a second delivery valve 195; the low-pressure container 192 is connected to the lock bucket body 110 through a first delivery pipeline; the high-pressure container 193 is connected to the lock bucket body 110 through a second delivery pipeline; the first delivery valve 194 is arranged on the first delivery pipeline; the second delivery valve 195 is arranged on the second delivery pipeline.
[0066] The powder is placed in the low-pressure container 192 and the high-pressure container 193. The pressure in the low-pressure container 192 is lower than the pressure in the high-pressure container 193. The pressure relief and pressure filling of the lock bucket are used to transfer the powder between the low-pressure container 192 and the high-pressure container 193. The first delivery valve 194 and the second delivery valve 195 are used to control the opening and closing of the first delivery pipeline and the second delivery pipeline, respectively.
[0067] In some embodiments, the locking bucket assembly 10 further includes a pressurizing portion 197 and a pressurizing valve 196; the pressurizing portion 197 is connected to the locking bucket body 110 via a second pressurizing pipeline; and the pressurizing valve 196 is disposed on the second pressurizing pipeline.
[0068] The pressurizing part 197 is provided to play the role of supplementary pressurization. When the buffer container 20 does not reach the preset high pressure when the pressurization is completed, the pressurizing part 197 can be used to continue to pressurize the lock bucket body 110 until the preset high pressure is reached and stopped; the pressurizing valve 196 is provided to control the on and off of the second pressurizing pipeline, thereby controlling the pressurization process of the lock bucket body 110. In the pressurization stage of the lock bucket body 110, the compressor 30 is turned on and the pressurizing valve 191 is started, and the gas stored in the buffer container 20 pressurizes the lock bucket body 110. When the pressure of the buffer container 20 drops to the limit, the pressurizing valve 191 and the compressor 30 are closed, and the pressurizing valve 196 and the pressurizing part 197 are opened to continue pressurizing the lock bucket body 110 until the preset high pressure is reached.
[0069] It should be noted that the pressurizing valve 196 includes but is not limited to a regulating valve; for example, the pressurizing valve 196 is a regulating valve that controls the flow rate by adjusting the pressure difference. The specific structure and working principle of the regulating valve are all prior art and will not be described in detail in this application. By setting a regulating valve as the pressurizing valve 196, the charging rate can be controlled to achieve orderly charging and avoid excessive flow.
[0070] It should also be noted that the pressurizing part 197 is a high-pressure gas source and can provide high-pressure gas.
[0071] As can be seen from the above, the lock bucket device executes the cycle of collecting materials - charging - discharging - unloading - collecting materials, which is called the lock bucket cycle, which is described in detail below:
[0072] Material collection - the pressure of the lock bucket body 110 is equivalent to the pressure of the low-pressure container 192, and all valves are in a closed state, and the material collection conditions are met. The first delivery valve 194 is opened to start material collection; when the material collection time is reached or the material level of the lock bucket body 110 reaches a preset high level, the material collection is completed and the first delivery valve 194 is closed; of course, the material collection time and the preset high level are set according to actual needs;
[0073] Pressurization—the buffer container 20 stores the discharged gas of the previous lock bucket cycle. The compressor 30 and the pressure-charging valve 191 are turned on to pressurize the lock bucket body 110 until the pressure in the buffer container 20 drops to the first preset pressure, and the compressor 30 and the pressure-charging valve 191 are turned off. Since the pressure of the lock bucket body 110 has not reached the preset high pressure at this time, the pressurizing part 197 and the pressurizing valve 196 are turned on to continue to pressurize the lock bucket body 110 until the pressure of the lock bucket body 110 reaches the preset high pressure. After the pressurization is completed, the pressurizing part 197 and the pressurizing valve 196 are turned off. Of course, the first preset pressure and the preset high pressure are set according to actual needs.
[0074] Discharging—The pressure of the lock bucket body 110 is equal to the pressure of the high-pressure container 193, and all valves are in a closed state, which means that the conditions for discharging are met. The second delivery valve 195 is opened to start discharging. When the discharging time is reached or the material level of the lock bucket body 110 reaches a preset low level, the discharging is finished and the second delivery valve 195 is closed. Of course, the discharging time and the preset low level are set according to actual needs.
[0075] Pressure relief—the buffer container 20 is in a low-pressure state, the buffer valve 150 is opened, and the lock bucket body 110 releases pressure to the buffer container 20 until the pressure is equalized or the pressure difference between the lock bucket body 110 and the buffer container 20 is less than the preset difference, the buffer valve 150 is closed and the vent valve 160 is opened to continue to release pressure until the pressure of the lock bucket body 110 reaches the preset low pressure, the pressure relief is completed, and the vent valve 160 is closed; of course, the preset difference and the preset low pressure are set according to actual needs;
[0076] The lock bucket body 110 continues to collect materials, completing a lock bucket cycle.
[0077] At least one embodiment of the present invention further provides a pulverized coal gasification system, comprising the bucket locking device of any embodiment of the present invention, thereby having all the technical effects brought by the technical solutions of the above embodiments.
[0078] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A bucket locking device, characterized in that: include: At least one lock bucket assembly, the lock bucket assembly comprising a lock bucket body; A buffer container, comprising an air inlet and an air outlet, wherein the air inlet is connected to the lock bucket body, and the air outlet is connected to the lock bucket body through a first pressure charging pipeline; and The compressor is arranged on the first charging pipeline.
2. The bucket lock device according to claim 1, characterized in that: The lock bucket assembly comprises: A pressure relief pipeline, one end of which is connected to the lock bucket body; A buffer branch, the two ends of which are respectively connected to the air inlet and an end of the pressure relief pipeline away from the lock bucket body; A venting branch, one end of which is connected to an end of the pressure relief pipeline away from the lock bucket body; a buffer valve, arranged on the buffer branch; and The vent valve is arranged on the vent branch line.
3. The bucket lock device according to claim 2, characterized in that: The lock bucket assembly also includes: A first flow limiting plate is disposed in the buffer branch, the first flow limiting plate is located on a side of the buffer valve away from the pressure relief pipeline; and A second flow limiting plate is arranged in the vent branch, and the second flow limiting plate is located on a side of the vent valve away from the pressure relief pipeline; Wherein, a plurality of flow limiting holes are arranged on the first flow limiting plate and the second flow limiting plate.
4. The bucket lock device according to claim 2, characterized in that: The lock bucket assembly also includes a filter, and the filter is arranged on the pressure relief pipeline.
5. The bucket lock device according to any one of claims 1 to 4, characterized in that: The first charging pipeline comprises: a main pipeline, one end of which is connected to the buffer container and the other end of which is connected to the compressor; and At least one charging branch, at least one of the charging branches corresponds to at least one of the locking bucket assemblies, one end of the charging branch is connected to the compressor, and the other end is connected to the locking bucket body of the corresponding locking bucket assembly.
6. The bucket lock device according to claim 5, characterized in that: The lock bucket assembly also includes a pressure charging valve, which is arranged on the pressure charging branch.
7. The bucket lock device according to any one of claims 1 to 4, characterized in that: The lock bucket assembly also includes: A low-pressure container is connected to the lock bucket body through a first delivery pipeline; A high-pressure container is connected to the lock bucket body through a second delivery pipeline; A first delivery valve, disposed on the first delivery pipeline; and The second delivery valve is arranged on the second delivery pipeline.
8. The bucket lock device according to any one of claims 1 to 4, characterized in that: The lock bucket assembly also includes: A pressurizing part, connected to the lock bucket body through a second pressurizing pipeline; and The pressurizing valve is arranged on the second pressure charging pipeline.
9. A pulverized coal gasification system, characterized in that: It comprises a locking bucket device as described in any one of claims 1-8.