A sampling device and method for urea pneumatic conveying pipelines

Abstract

This invention discloses a sampling device and method for urea pneumatic conveying pipelines. By setting a right-angle channel inside the sampling head and using an electromagnet and power controller to periodically switch power on and off, the position of the sampling head can be controlled by a spring. When powered on, the sampling head protrudes into the urea pneumatic conveying pipeline, with the sampling port directly facing the urea particle flow. Urea particles are collected into a sample container through the sampling port. When powered off, the electromagnet loses its magnetism and can no longer attract the sampling head. Under the restoring force of the spring, the sampling head returns to its initial state, and the sampling port leaves the urea pneumatic conveying pipeline. When the urea particle conveying ends, the operation automatically stops, and sampling is complete. This invention achieves automatic sampling on urea particle pneumatic conveying pipelines, effectively solving the problem of inconvenient urea sampling in pneumatic conveying methods. The device has a novel structure, is easy to install, and facilitates sampling, making it of significant practical importance.

Description

Technical Field

[0001] This invention belongs to the field of automated sampling devices, and in particular to a sampling device and method for urea pneumatic conveying pipelines. Background Technology

[0002] Liquid ammonia is the reducing agent used in the denitrification reaction of coal-fired power plant denitrification units. However, liquid ammonia is a major hazard source, and with increasingly stringent policy requirements, it is gradually being replaced by urea-based ammonia production. The urea-based ammonia production system includes a urea dissolution system and a urea reaction system. In the urea dissolution system, urea granules are typically transported by tanker trucks and pneumatically conveyed to the urea dissolution tanks to prepare the urea solution. In recent years, due to quality issues with some urea, such as the presence of chlorides, localized corrosion in hydrolyzers and rupture of heating coils have occurred. Therefore, sampling and testing of urea granules is particularly important. Because the pneumatic conveying system in tanker trucks is fully enclosed, sampling is inconvenient, and the representativeness of the samples is difficult to guarantee. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and provide a sampling device and method for urea pneumatic conveying pipelines.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A sampling device for a urea pneumatic delivery pipeline includes a urea pneumatic delivery pipeline, an electromagnet, a sampling head, a spring, a power controller, a housing, a sample container, and a power supply unit.

[0006] A first circular hole is opened at the bottom of the urea pneumatic delivery pipe, and a sampling head is installed in the first circular hole. One end of a spring is connected to the outer ring of the first circular hole, and the other end of the spring is connected to the bottom of the annular groove of the sampling head. The electromagnet is in contact with the annular surface of the outer ring of the sampling head. The electromagnet is connected to a power controller, and the power controller is connected to a power supply unit. The outer shell is fitted over the outside of the sampling head. One end of the outer shell is connected to the urea pneumatic delivery pipe, and the other end of the outer shell is connected to a sample container. A right-angle channel is opened in the center of the sampling head. One end of the right-angle channel opens towards the direction of the urea particle airflow, and the other end of the right-angle channel opens towards the sample container.

[0007] Furthermore, the power supply unit is a generator or a battery module.

[0008] Furthermore, the generator is connected to the battery module and the power controller.

[0009] Furthermore, a second circular hole is opened at the bottom of the urea pneumatic conveying pipeline, and a motor shaft passes through the second circular hole.

[0010] Furthermore, one end of the motor shaft is connected to the generator impeller, and the other end of the generator shaft is connected to the generator.

[0011] Furthermore, the sampling head is integrally cast from iron material.

[0012] Furthermore, the outer casing is connected to the sample container via threads.

[0013] A sampling method for a urea pneumatic delivery pipeline based on the aforementioned device, comprising:

[0014] A high-speed airflow is introduced to transport urea particles, causing the generator impeller to rotate at high speed, which drives the generator to generate electricity. The generated current is transmitted to the power controller, and the power controller enters a cyclic on-off working state after receiving the current signal.

[0015] When the power controller is powered on, the electromagnet generates magnetism, the spring is compressed, causing the sampling head to protrude into the urea pneumatic conveying pipeline, the sampling port is directly facing the urea particle airflow, and the urea particles are collected into the sample container through the sampling port.

[0016] When the power controller is powered off, the electromagnet loses its magnetism and cannot attract the sampling head. Under the action of the spring's rebound force, the sampling head returns to its initial state, and the sampling port leaves the urea pneumatic delivery pipeline.

[0017] When the urea granule delivery is finished, the high-speed airflow is turned off, the generator impeller stops rotating, the power controller automatically stops working, the sampling is completed, the device returns to the initial state, and the sample container is removed.

[0018] When the generator temporarily fails, the battery module is activated to provide power, enabling sampling in a temporary emergency.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention provides a sampling device for urea pneumatic conveying pipelines. A right-angle channel is set inside the sampling head, with one end opening towards the direction of the urea particle airflow and the other end opening towards the sample container. High-speed airflow carries urea particles from the urea pneumatic conveying pipeline into the right-angle channel and then into the sample container. By using a power controller to periodically switch power on and off, the position of the sampling head can be controlled by an electromagnet and a spring. The sampling port automatically pops out during pneumatic conveying of urea particles, and multiple samples can be collected at intervals. This achieves automatic sampling on the urea particle pneumatic conveying pipeline, effectively solving the problem of inconvenient urea sampling in pneumatic conveying methods. Furthermore, this device features a novel structure, convenient sampling, and simple installation. The samples obtained are highly representative and have significant practical application value. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the sampling device under sampling conditions according to the present invention.

[0023] Figure 2 This is a schematic diagram of the sampling device in the non-sampling state of the present invention.

[0024] Figure 3 This is a schematic diagram of the sampling head of the present invention.

[0025] Among them: 1-Urea pneumatic conveying pipeline, 2-Electromagnet, 3-Sampling head, 4-Spring, 5-Power generator impeller, 6-Generator, 7-Battery module, 8-Power controller, 9-Outer casing, 10-Sample container. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] See Figures 1 to 3This invention provides a sampling device for a urea pneumatic conveying pipeline, comprising a urea pneumatic conveying pipeline 1, an electromagnet 2, a sampling head 3, a spring 4, a generator impeller 5, a generator 6, a battery module 7, a power controller 8, a housing 9, and a sample container 10. Urea particles are conveyed through the urea pneumatic conveying pipeline 1 using a high-speed, high-pressure compressed air stream. A large circular hole is provided at the bottom of the urea pneumatic conveying pipeline 1, and the spring 4, electromagnet 2, and housing 9 are fixed to the outer circumference of the large circular hole from the inside out. A small circular hole is also provided near the large circular hole, through which a motor shaft can pass. One end of the motor shaft is the generator impeller 5, installed inside the urea pneumatic conveying pipeline 1, and the other end is connected to the generator 6. The generator 6 is connected to the battery module 7 and the power controller 8. The generator 6 can charge the battery module 7 and also directly supply power to the power controller 8. The battery module 7 is also connected to the power controller 8, supplying power to the power controller 8. The power controller 8 is connected to the electromagnet 2, and the power controller 8 can control the on / off state of the electromagnet 2, achieving fixed intervals of energization and de-energization. The sampling head 3 is made of iron and is a one-piece cast model. The central cylinder of the sampling head 3 has a right-angled channel, with the upper opening facing the direction of the urea particle airflow and the lower opening facing the sample container 10. The upper end of the spring 4 is fixed to the outer ring of the large circular hole, and the lower end is fixed to the bottom of the annular groove of the sampling head 3. The spring 4 can freely extend and retract within the annular groove. The electromagnet 2 is completely fitted to the annular surface of the outer ring of the sampling head 3. The outer casing 9 is a cylindrical sleeve structure, with its upper part fixedly connected to the urea pneumatic delivery pipe 1, and an opening on its bottom surface with threads inside. The sample container 10 is fixed to the outer casing 9 via a threaded connection.

[0034] The sampling method for urea pneumatic delivery pipelines is as follows:

[0035] Before sampling, install the sample container 10 on the lower part of the outer casing 9. At this time, the system status is as follows: Figure 2As shown. Then, urea granules begin to be conveyed. Under the action of high-speed airflow, the generator impeller 5 rotates at high speed, driving the generator 6 to generate electricity. The generated current is transmitted to the power controller 8. After receiving the current signal, the power controller 8 enters a cyclic on-off working state. Different on-time and off-time can be set according to sampling requirements to achieve fixed sampling at equal time intervals during urea granule conveying, thereby improving the representativeness of the sampling. In the energized state, the current is rectified by the power controller 8 to power the electromagnet 2. At this time, the electromagnet 2 is magnetic, attracting the outer ring surface of the sampling head 3 and making it completely adhered to it. The spring 4 is in a compressed state. At this time, the sampling head 3 protrudes into the urea pneumatic conveying pipe 1, and the sampling port is directly facing the urea granule airflow. Urea granules are collected into the sample container 10 through the sampling port. In the de-energized state, the electromagnet 2 loses its magnetism and can no longer attract the sampling head 3. Under the action of the spring 4's rebound force, the sampling head 3 returns to its initial state, and the sampling port leaves the urea pneumatic conveying pipe 1. At this time, no sampling is performed. When the urea granule delivery is completed, there is no airflow in the urea pneumatic delivery pipeline 1, the generator impeller 5 stops rotating, the power controller 8 receives no current signal, and automatically stops working. Sampling is completed, the device returns to its initial state, and the sample container 10 is removed and sent for analysis. If the generator 6 temporarily malfunctions, the battery module 7 can be manually activated to provide power until repairs are completed, enabling sampling in a temporary emergency.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sampling device for a urea pneumatic conveying pipeline, characterized in that, It comprises a urea pneumatic conveying pipeline (1), an electromagnet (2), a sampling head (3), a spring (4), a power supply controller (8), a shell cover (9), a sample container (10) and a power supply unit; The bottom of the urea pneumatic conveying pipeline (1) is provided with a first circular hole, the first circular hole is provided with the sampling head (3), one end of the spring (4) is connected to the outer ring of the first circular hole, the other end of the spring (4) is connected to the bottom of the annular groove of the sampling head (3), the outer ring surface of the sampling head (3) is attached to the electromagnet (2), the electromagnet (2) is connected to the power supply controller (8), the power supply controller (8) is connected to the power supply unit, the shell cover (9) is sleeved on the outside of the sampling head (3), one end of the shell cover (9) is connected to the urea pneumatic conveying pipeline (1), the other end of the shell cover (9) is connected to the sample container (10), a right-angle channel is formed in the center of the sampling head (3), one end of the right-angle channel is opened to face the direction of the urea particle gas flow, the other end of the right-angle channel is opened to face the sample container (10); The bottom of the urea pneumatic conveying pipeline (1) is provided with a second circular hole, the motor shaft is penetrated in the second circular hole; One end of the motor shaft is connected to the power generation impeller (5), the other end of the motor shaft is connected to the generator (6); The sampling head (3) is integrally cast by iron material; The shell cover (9) and the sample container (10) are connected by threads; The power supply unit is the generator (6).

2. A sampling device for a urea pneumatic conveying pipeline according to claim 1, characterized in that, The generator (6) is connected to the battery module (7) and the power supply controller (8).

3. A method for sampling a urea pneumatic conveying pipeline based on the apparatus of any one of claims 1-2, characterized in that, It comprises: The urea particles are conveyed by the high-speed gas flow, the power generation impeller (5) rotates at high speed, the generator (6) generates electricity, the current generated is transmitted to the power supply controller (8), the power supply controller (8) enters the working state of cyclic on-off power supply after receiving the current signal; When the power supply controller (8) is powered on, the electromagnet (2) generates magnetism, the spring (4) is in a compressed state, the sampling head (3) protrudes into the urea pneumatic conveying pipeline (1), the sampling port is directly opposite to the urea particle gas flow, the urea particles are collected into the sample container (10) through the sampling port; When the power supply controller (8) is powered off, the electromagnet (2) loses magnetism and cannot attract the sampling head (3), under the action of the spring (4) rebound force, the sampling head (3) returns to the initial state, the sampling port leaves the urea pneumatic conveying pipeline (1); When the urea particle conveying is completed, the high-speed gas flow is turned off, the power generation impeller (5) stops rotating, the power supply controller (8) automatically stops working, the sampling is completed, the device returns to the initial state, and the sample container (10) is taken away; When the generator (6) temporarily fails, the battery module (7) is turned on to supply power, so as to realize sampling in the temporary emergency state.

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