CN219084285U

CN219084285U - Primary air measuring system with soot blower for thermal power plant unit

Info

Publication number: CN219084285U
Application number: CN202222448756.5U
Authority: CN
Inventors: 杜慧
Original assignee: China Huadian Engineering Group Co Ltd
Current assignee: China Huadian Engineering Group Co Ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-05-26
Anticipated expiration: 2032-09-15

Abstract

The utility model discloses a primary air measurement system of a thermal power plant unit with a soot blower, which comprises a primary air system air outlet pipe, wherein a differential pressure air measuring device is arranged in the primary air system air outlet pipe, the differential pressure air measuring device comprises a full-pressure pipe and a static pressure pipe, a differential pressure sensor in the full-pressure pipe is electrically connected with a differential pressure transmitter, and a differential pressure sensor in the static pressure pipe is electrically connected with the differential pressure transmitter; the full-pressure collecting pipe is communicated with the full-pressure collecting pipe, a first valve body is arranged on the full-pressure collecting pipe, the full-pressure collecting pipe between the full-pressure pipe and the first valve body is communicated with one end of a first blowing pipe, the other end of the first blowing pipe is communicated with an air outlet of the blower, and a second valve body is arranged on the first blowing pipe. The utility model can automatically purge, is simple and convenient, and can ensure the accuracy of the primary air quantity.

Description

Primary air measuring system with soot blower for thermal power plant unit

Technical Field

The utility model relates to a primary air measuring system of a thermal power plant unit with a soot blower, and belongs to the technical field of thermal power plant equipment.

Background

In a boiler combustion system of a thermal power plant, a primary air system is an important system for ensuring pulverized coal transportation and boiler combustion, and the difficulty that primary air force cannot be accurately and stably measured for a long time is puzzled to a coal-fired power plant. How to improve the automatic regulation level, load response speed and combustion efficiency of a boiler in a thermal power plant is an important research topic for technicians. In order to reasonably adjust the air-coal ratio of the coal mill and improve the automatic input rate of the boiler, so that the boiler is reasonable in air distribution, stable in combustion and high in efficiency, the air speed, the air quantity and the powder-making ventilation quantity in a secondary air pipe of the boiler must be accurately and stably measured for a long time. However, because the primary air, the secondary air and the powder-making air are dust-containing air flows, the blockage and the abrasion of the measuring device are easily caused, the arrangement space of the powder-making system is limited, the cold and hot air pipelines have no enough straight pipe sections, the measuring points are not easy to arrange, and the like, and the primary air volume measuring device of most thermal power plants cannot normally operate.

Disclosure of Invention

The utility model aims to provide a primary air measuring system of a thermal power plant unit with a soot blower, which can automatically purge, is simple and convenient, and can ensure the accuracy of primary air quantity.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a primary air measuring system of a thermal power plant unit with a soot blower comprises a primary air system air outlet pipe, wherein a differential pressure air measuring device is arranged in the primary air system air outlet pipe, the differential pressure air measuring device comprises a full-pressure pipe and a static pressure pipe, a differential pressure sensor in the full-pressure pipe is electrically connected with a differential pressure transmitter, and a differential pressure sensor in the static pressure pipe is electrically connected with the differential pressure transmitter; the full-pressure collecting pipe is communicated with the full-pressure collecting pipe, a first valve body is arranged on the full-pressure collecting pipe, the full-pressure collecting pipe between the full-pressure pipe and the first valve body is communicated with one end of a first blowing pipe, the other end of the first blowing pipe is communicated with an air outlet of the blower, and a second valve body is arranged on the first blowing pipe; the static pressure pipe is communicated with the static pressure collecting pipe, a third valve body is arranged on the static pressure collecting pipe, the static pressure collecting pipe between the static pressure pipe and the third valve body is communicated with one end of a second blowing pipe, the other end of the second blowing pipe is communicated with an air outlet of the blower, and a fourth valve body is arranged on the second blowing pipe.

In the primary air measurement system of the thermal power plant with the soot blower, the number of the static pressure pipes is two, one static pressure pipe is located at the upstream of the full pressure pipe, and the other static pressure pipe is located at the downstream of the full pressure pipe.

In the primary air measuring system of the thermal power plant with the soot blower, the differential pressure wind measuring device further comprises a first guide plate, a second guide plate and a third guide plate, the section of the second guide plate is streamline, and the first guide plate and the third guide plate are symmetrically arranged on two sides of the second guide plate; the cross section of the first deflector is one half of the cross section of the second deflector, and the cross section of the third deflector is one half of the cross section of the second deflector.

Compared with the prior art, the automatic blowing device can automatically blow, is simple and convenient, and can ensure the accuracy of primary air quantity.

Drawings

FIG. 1 is a schematic view of a first baffle, a second baffle, and a third baffle;

FIG. 2 is a schematic diagram of a differential pressure wind-measuring device.

Reference numerals: 1. an air outlet pipe of the primary air system; 2. a first deflector; 3. a second deflector; 4. a third deflector; 5. a static pressure pipe; 6. a full pressure pipe; 7. a second valve body; 8. a fourth valve body; 9. a third valve body; 10. a first valve body.

The utility model is further described below with reference to the drawings and the detailed description.

Detailed Description

Example 1 of the present utility model: the primary air measuring system of the thermal power plant with the soot blower comprises a primary air system air outlet pipe 1, wherein a differential pressure air measuring device is arranged in the primary air system air outlet pipe 1 and comprises a full pressure pipe 6 and a static pressure pipe 5, a differential pressure sensor in the full pressure pipe 6 is electrically connected with a differential pressure transmitter, and a differential pressure sensor in the static pressure pipe 5 is electrically connected with the differential pressure transmitter; the full-pressure pipe 6 is communicated with a full-pressure collecting pipe, a first valve body 10 is arranged on the full-pressure collecting pipe, the full-pressure collecting pipe between the full-pressure pipe 6 and the first valve body 10 is communicated with one end of a first blowing pipe, the other end of the first blowing pipe is communicated with an air outlet of a blower, and a second valve body 7 is arranged on the first blowing pipe; the static pressure pipe 5 is communicated with a static pressure collecting pipe, a third valve body 9 is arranged on the static pressure collecting pipe, the static pressure collecting pipe between the static pressure pipe 5 and the third valve body 9 is communicated with one end of a second blowing pipe, the other end of the second blowing pipe is communicated with an air outlet of the blower, and a fourth valve body 8 is arranged on the second blowing pipe.

Example 2: the primary air measuring system of the thermal power plant with the soot blower comprises a primary air system air outlet pipe 1, wherein a differential pressure air measuring device is arranged in the primary air system air outlet pipe 1 and comprises a full pressure pipe 6 and a static pressure pipe 5, a differential pressure sensor in the full pressure pipe 6 is electrically connected with a differential pressure transmitter, and a differential pressure sensor in the static pressure pipe 5 is electrically connected with the differential pressure transmitter; the full-pressure pipe 6 is communicated with a full-pressure collecting pipe, a first valve body 10 is arranged on the full-pressure collecting pipe, the full-pressure collecting pipe between the full-pressure pipe 6 and the first valve body 10 is communicated with one end of a first blowing pipe, the other end of the first blowing pipe is communicated with an air outlet of a blower, and a second valve body 7 is arranged on the first blowing pipe; the static pressure pipe 5 is communicated with a static pressure collecting pipe, a third valve body 9 is arranged on the static pressure collecting pipe, the static pressure collecting pipe between the static pressure pipe 5 and the third valve body 9 is communicated with one end of a second blowing pipe, the other end of the second blowing pipe is communicated with an air outlet of the blower, and a fourth valve body 8 is arranged on the second blowing pipe.

The number of the static pressure pipes 5 is two, wherein one static pressure pipe 5 is positioned upstream of the full pressure pipe 6, and the other static pressure pipe 5 is positioned downstream of the full pressure pipe 6. The differential pressure wind measuring device further comprises a first guide plate 2, a second guide plate 3 and a third guide plate 4, the section of the second guide plate 3 is streamline, and the first guide plate 2 and the third guide plate 4 are symmetrically arranged on two sides of the second guide plate 3; the cross section of the first baffle 2 is one half of the cross section of the second baffle 3, and the cross section of the third baffle 4 is one half of the cross section of the second baffle 3.

The working principle of one embodiment of the utility model is as follows: the first valve body 10, the second valve body 7, the third valve body 9 and the fourth valve body 8 are sent to an electronic equipment room through control cables to enter a DCS, and a combined switch button capable of controlling the switching state of the valve bodies is added on a display screen of an operator station. In the normal operation process, the second valve body 7 and the fourth valve body 8 are closed, and the first valve body 10 and the third valve body 9 are communicated, so that the sampling pipeline and the sampling valve are communicated, and the primary air quantity is ensured to be normally displayed. When an operator finds that the primary air volume measurement value is inaccurate or the primary air volume measurement value is not purged for a certain time through experience, the first valve body 10 and the third valve body 9 are closed through the combined switch, the second valve body 7 and the fourth valve body 8 are communicated, the sampling pipeline and the sampling valve are closed and are not communicated, and the purging pipeline and the sampling pipeline are communicated, so that the back-purging of the sampling pipeline can be performed, and dust in the sampling pipeline is back-blown into an air duct of the primary air volume. The time relay can be additionally arranged on the control loop, the purging time is set according to the actual conditions of respective power plants, after the purging time is up, the time relay acts to cause the valve body to act, the sampling pipeline is disconnected from the purging pipeline, the sampling pipeline is communicated with the sampling valve, and the primary air volume measuring device normally measures. In the back-flushing process, the automatic flushing button on the operation display screen turns grey and cannot be clicked any more until the automatic flushing is completed, and the automatic flushing button is reset to complete one-time automatic flushing.

Claims

1. The primary air measuring system of the thermal power plant with the soot blower comprises a primary air system air outlet pipe (1), wherein a differential pressure air measuring device is arranged in the primary air system air outlet pipe (1), and is characterized by comprising a full pressure pipe (6) and a static pressure pipe (5), wherein a differential pressure sensor in the full pressure pipe (6) is electrically connected with a differential pressure transmitter, and a differential pressure sensor in the static pressure pipe (5) is electrically connected with the differential pressure transmitter; the full-pressure collecting pipe (6) is communicated with the full-pressure collecting pipe, a first valve body (10) is arranged on the full-pressure collecting pipe, the full-pressure collecting pipe between the full-pressure pipe (6) and the first valve body (10) is communicated with one end of a first blowing pipe, the other end of the first blowing pipe is communicated with an air outlet of the blower, and a second valve body (7) is arranged on the first blowing pipe;

the static pressure pipe (5) is communicated with the static pressure collecting pipe, a third valve body (9) is arranged on the static pressure collecting pipe, the static pressure collecting pipe between the static pressure pipe (5) and the third valve body (9) is communicated with one end of a second blowing pipe, the other end of the second blowing pipe is communicated with an air outlet of the blower, and a fourth valve body (8) is arranged on the second blowing pipe.

2. A primary air measuring system of a thermal power plant with a soot blower according to claim 1, characterized in that the number of static pressure pipes (5) is two, wherein one static pressure pipe (5) is located upstream of the full pressure pipe (6) and the other static pressure pipe (5) is located downstream of the full pressure pipe (6).

3. The primary air measuring system of a thermal power plant unit with a soot blower according to claim 1, wherein the differential pressure wind measuring device further comprises a first deflector (2), a second deflector (3) and a third deflector (4), the section of the second deflector (3) is streamline, and the first deflector (2) and the third deflector (4) are symmetrically arranged on two sides of the second deflector (3); the cross section of the first guide plate (2) is one half of the cross section of the second guide plate (3), and the cross section of the third guide plate (4) is one half of the cross section of the second guide plate (3).