Novel rotatable flue gas sampling device for circular flue

Abstract

The utility model discloses a novel rotatable flue gas sampling device for a circular flue, which comprises an annular flue gas separation bin, the annular flue gas separation bin is formed by sequentially and coaxially sleeving a closed cylindrical bin chamber and a plurality of annular bin chambers from inside to outside, the upper ends of all the bin chambers are flush, and the lengths of all the bin chambers are sequentially reduced from inside to outside; the multi-layer annular partition bin and the labyrinth type sealing structure are arranged in the multi-layer annular partition bin, each bin is composed of an upper portion and a lower portion which can rotate relative to each other, and the upper half portions and the lower half portions of all the bins are jointly connected through the same labyrinth type sealing connecting piece. The multi-layer annular partition bin and the labyrinth type sealing structure are utilized, and therefore timing, fixed-angle and full-section smoke component measurement can be achieved; the full-section flue gas component distribution condition of an inlet and an outlet of energy-saving and environment-friendly equipment is provided for operation technicians, the refined energy-saving and environment-friendly requirements of a coal-fired power plant are met, and energy conservation and environment protection are

Description

Technical Field

[0001] This utility model belongs to the technical field of flue gas sampling in circular flues of coal-fired boilers, specifically relating to a novel rotatable circular flue gas sampling device. Background Technology

[0002] Common flue gas energy-saving and environmental protection devices include air preheaters, economizers, dust collectors, flue gas denitrification devices, desulfurization towers, and wet electrostatic precipitators. The requirements for refined energy conservation and environmental protection in coal-fired boilers are becoming increasingly stringent. Flue gas energy-saving and environmental protection devices are generally designed based on the uniform distribution of inlet flue gas under rated load. However, in actual operation, due to factors such as different coal types, load variations, air distribution changes, flue bends, and damper openings, these devices often operate under conditions deviating from their design specifications. Traditional flue gas sampling devices suffer from fixed sampling points and a limited number of sampling points, making it difficult for operating technicians to accurately obtain the flue gas composition distribution across the entire flue section.

[0003] Therefore, it is necessary to develop a new type of rotatable circular flue gas sampling device to solve the problem that it is difficult for operating technicians to obtain the full cross-sectional flue gas composition distribution at the inlet and outlet flues of energy-saving and environmental protection equipment during the operation of coal-fired boilers, so as to meet the society's refined energy-saving and environmental protection requirements for coal-fired boilers. Summary of the Invention

[0004] This invention provides a novel rotatable circular flue gas sampling device to address these problems. Utilizing a multi-layered annular compartment and a labyrinthine sealing structure, this device enables timed and angled full-section flue gas composition measurement. It provides technicians with information on the full-section flue gas composition distribution at the inlet and outlet of energy-saving and environmentally friendly equipment, meeting the refined energy-saving and environmental protection needs of coal-fired power plants. With its simple structure, it has significant potential for widespread application.

[0005] This utility model is achieved through the following technical solution:

[0006] A novel rotatable circular flue gas sampling device includes a flue gas annular compartment, which is composed of a closed cylindrical chamber and multiple annular chambers coaxially nested from the inside to the outside. The upper ends of all chambers are flush and the length of each chamber decreases from the inside to the outside. Each chamber is composed of two rotatable upper and lower parts, and the upper and lower parts of all chambers are connected by the same labyrinth-type sealing connector.

[0007] Each of the lower half of the sidewalls of all compartments is connected to a flue gas sampling tube. The upper end of each flue gas sampling tube is connected to the sidewall of its corresponding compartment. The lower openings of all flue gas sampling tubes are flush and evenly distributed along the same radius of the flue cross-section. The upper half of the flue gas annular separation compartment is fixed inside the flue, and a sampling flue gas interface is connected to the top of the upper half of the compartment. The end openings of all sampling flue gas interfaces extend out of the flue and are connected to an external flue gas composition measuring device. The motor is fixed inside the flue, and the output shaft of the motor coincides with the central axis of the cylindrical compartment and is fixedly connected to the lower half. The motor drives the lower half of the flue gas annular separation compartment to rotate around its own central axis, and drives all the upper flue gas sampling tubes installed on it to rotate together.

[0008] Furthermore, the flue gas annular separation chamber is formed by sequentially connecting and fixing a closed cylindrical chamber, a first annular chamber, a second annular chamber, and a third annular chamber from the inside out.

[0009] Furthermore, the flue gas sampling tube is L-shaped, with its horizontal section connected to the side wall of the corresponding compartment, and the opening at the end of the vertical section facing the direction of the flue gas in the flue; the sampling flue gas interface is L-shaped, with its vertical section connected to the top of the corresponding compartment, and the end of the horizontal section being a flue gas emission port connected to an external flue gas composition measuring device.

[0010] Furthermore, a sampling head is installed on the end opening of the flue gas sampling pipe.

[0011] Furthermore, the flue gas sampler and the sampling head are connected by a screw thread.

[0012] Furthermore, the connection between the flue gas sampling pipe and each compartment of the flue gas annular separation chamber is a threaded connection.

[0013] Furthermore, the sampling flue gas interface and the corresponding compartment of the flue gas annular separation chamber are threaded together.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention relates to a novel rotatable circular flue gas sampling device, primarily designed to address the challenge of obtaining comprehensive flue gas composition distribution data across the inlet and outlet flues of energy-saving and environmentally friendly equipment during coal-fired boiler operation. This allows for precise energy conservation and environmental protection requirements to be met by coal-fired power units. The device enables full-section flue gas composition measurement within a circular flue, facilitating timely acquisition of flue gas composition distribution data at the inlet and outlet flues of energy-saving and environmentally friendly equipment by operating technicians, thus fulfilling the refined energy conservation and environmental protection needs of coal-fired power units. Attached Figure Description

[0016] Figure 1This is an overall schematic diagram of the rotatable circular flue gas sampling device of this utility model.

[0017] Figure 2 This is a schematic diagram of the process flow of the rotatable circular flue gas sampling device of this utility model.

[0018] Figure 3 This is a front view of the rotatable circular flue gas sampling device of this utility model;

[0019] Figure 4 This is a bottom view of the rotatable circular flue gas sampling device of this utility model.

[0020] Figure 5 This is a cross-sectional schematic diagram of the flue gas annular separation chamber and the labyrinth-type sealing connection.

[0021] In the diagram: 1-Flue gas sampling pipe, 2-Sampling head, 3-Flue gas annular separator, 4-Maze-type sealing connector, 5-Motor, 6-Sampling flue gas interface, 7-Flue duct. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific implementation examples. The description is for the purpose of explaining the present invention and not limiting it.

[0023] The novel rotatable circular flue gas sampling device provided in this embodiment, such as Figures 1-5 As shown, in actual use, the device is installed in the flue 7. The device includes a flue gas annular separation chamber 3, which is composed of a closed cylindrical chamber and multiple annular chambers coaxially connected from the inside to the outside. The upper ends of all chambers are flush and the length of each chamber decreases from the inside to the outside. Each chamber is composed of two rotatable upper and lower parts, and the upper and lower parts of all chambers are connected by the same labyrinth-type sealing connector 4.

[0024] Each of the lower half of the sidewalls of all compartments is connected to a flue gas sampling tube 1. The upper end of each flue gas sampling tube 1 is connected to the sidewall of its corresponding compartment. The lower openings of all flue gas sampling tubes 1 are flush and evenly distributed along the same radius of the cross-section of the flue duct 7, allowing sampling of flue gas at different locations. The upper half of the flue gas annular separation compartment 3 is fixed inside the flue duct 7, and a sampling flue gas interface 6 is connected to the top of the upper half of the compartment. The end openings of all sampling flue gas interfaces 6 extend out of the flue duct 7 and are connected to an external flue gas composition measuring device. The motor 5 is fixed inside the flue duct, and the output shaft of the motor 5 coincides with the central axis of the cylindrical compartment and is fixedly connected to the lower half. The motor 5 drives the lower half of the flue gas annular separation compartment 3 to rotate around its own central axis, and drives all the upper flue gas sampling tubes 1 installed on it to rotate together. By controlling the motor 5, the flue gas annular separation compartment 3 can be rotated at a fixed time and angle.

[0025] In the above technical solution, because the lower half of the flue gas annular separator 3 rotates with the output shaft of the motor 5, while the upper half remains stationary, a labyrinth-type sealing connector 4 is provided. The labyrinth-type sealing connector 4 is used to reduce flue gas leakage during rotation. The end opening of the sampling flue gas interface 6 extends outside the flue 7 and connects to an external flue gas composition measuring device, enabling the measurement of flue gas composition at different radial positions within the flue duct. This facilitates timely understanding by operating technicians of the full-section flue gas composition distribution at the inlet and outlet of the energy-saving and environmental protection equipment.

[0026] The working process of this utility model is as follows:

[0027] (1) The present invention is installed in the flue 7 of a coal-fired boiler. When the coal-fired boiler is running normally, the motor 5 starts and drives the lower half of the flue gas annular separator 3 to rotate synchronously. The flue gas sampling tube 1 is fixed on the side wall of the lower half of the flue gas annular separator 3 and also rotates accordingly.

[0028] (2) Set the flue gas annular separation chamber 3 to rotate 10 degrees every 4 minutes, and then turn off the motor 5.

[0029] (3) After 6 minutes of rotation, the sampling head 2 installed at the end of the flue gas sampling pipe 1 begins to collect flue gas. The flue gas flows through the flue gas annular separator 3, the labyrinth-type sealing connector 4, and the sampling flue gas interface 6 before entering the external flue gas composition measuring device. After 20 minutes of measurement, the motor 5 starts again, and the flue gas annular separator 3 rotates 10 degrees within 4 minutes to reach the next position, and the flue gas composition is measured again. This cycle is repeated, and a round of flue gas composition measurement of the entire cross section of the flue can be completed every 18 hours.

[0030] In implementation of this invention, the number of flue gas sampling tubes 1 can be adjusted according to the size of the flue and measurement needs. As a preferred embodiment of this invention, the flue gas annular compartment 3 is formed by a closed cylindrical compartment 31 and three annular compartments—a first annular compartment 32, a second annular compartment 33, and a third annular compartment 34—connected and fixed sequentially from the inside out. The three annular compartments can essentially ensure sufficient collection of flue gas within the radial range of the flue.

[0031] Preferably, the flue gas sampling tube 1 is L-shaped, with its horizontal section connected to the side wall of the corresponding compartment, and the opening at the end of the vertical section facing the direction of the flue gas in the flue; the sampling flue gas interface 6 is also L-shaped, with its vertical section connected to the top of the corresponding compartment, and the end of its horizontal section being a flue gas emission port connected to an external flue gas composition measuring device.

[0032] Preferably, a sampling head 2 is installed on the end opening of the flue gas sampling pipe 1, preferably screwed on, so that the sampling head 2 can be easily disassembled inside the flue during shutdown maintenance.

[0033] Preferably, the flue gas sampling pipe 1 is connected to each compartment by a threaded connection. This facilitates disassembly of the flue gas sampling pipe 1 within the flue during shutdown maintenance. The sampling flue gas interface 6 is also threaded to the corresponding compartment.

[0034] The labyrinth seal connector 4 uses a common labyrinth seal product, which is a common dynamic-static separation seal in industry and is a well-known product.

[0035] As described above, the device of this utility model can realize the measurement of flue gas composition across the entire cross-section of a circular flue, which facilitates timely acquisition of flue gas composition distribution at the inlet and outlet flues of energy-saving and environmental protection equipment by operating technicians, meeting the refined energy-saving and environmental protection needs of coal-fired units and contributing to energy conservation and environmental protection.

Claims

1. A novel rotatable circular flue gas sampling device, characterized in that, It includes a flue gas annular separation chamber (3), which is composed of a closed cylindrical chamber and multiple annular chambers coaxially connected from the inside to the outside. The upper ends of all chambers are flush and the length of each chamber decreases from the inside to the outside. Each chamber is composed of two rotatable upper and lower parts, and the upper and lower parts of all chambers are connected by the same labyrinth-type sealing connector (4). A flue gas sampling tube (1) is connected to the lower half of each compartment. The upper end of each flue gas sampling tube (1) is connected to the side wall of its corresponding compartment. The lower openings of all flue gas sampling tubes (1) are flush and evenly distributed on the same radius of the cross-section of the flue (7). The upper half of the flue gas annular separation compartment (3) is fixed inside the flue (7), and a sampling flue gas interface (6) is connected to the top of the upper half of the compartment. The end openings of all sampling flue gas interfaces (6) extend out of the flue (7) and are connected to the external flue gas composition measuring device. The motor (5) is fixed inside the flue, and the output shaft of the motor (5) coincides with the central axis of the cylindrical compartment and is fixed to the lower half. The motor (5) drives the lower half of the flue gas annular separation compartment (3) to rotate around its own central axis and drives all the upper flue gas sampling tubes (1) installed on it to rotate together.

2. The novel rotatable circular flue gas sampling device as described in claim 1, characterized in that, The flue gas annular separation chamber (3) is formed by sequentially connecting and fixing a closed cylindrical chamber (31), a first annular chamber (32), a second annular chamber (33), and a third annular chamber (34) from the inside out.

3. The novel rotatable circular flue gas sampling device as described in claim 1, characterized in that, The flue gas sampling tube (1) is L-shaped, with its horizontal section connected to the side wall of the corresponding compartment and the vertical section opening facing the direction of the flue gas in the flue; the sampling flue gas interface (6) is L-shaped, with its vertical section connected to the top of the corresponding compartment and the horizontal section ending at the flue gas discharge port, which is connected to the external flue gas composition measuring device.

4. The novel rotatable circular flue gas sampling device as described in claim 1, characterized in that, A sampling head (2) is installed on the end opening of the flue gas sampling pipe (1).

5. The novel rotatable circular flue gas sampling device as described in claim 4, characterized in that, The flue gas sampling tube (1) and the sampling head (2) are connected by a screw thread.

6. The novel rotatable circular flue gas sampling device as described in claim 1, characterized in that, The connection between the flue gas sampling pipe (1) and each compartment of the flue gas annular separation chamber (3) is a threaded connection.

7. The novel rotatable circular flue gas sampling device as described in claim 1, characterized in that, The sampling flue gas interface (6) and the corresponding compartment of the flue gas annular separation chamber (3) are threaded together.

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