CN221259963U - Primary air quantity measuring device of coal mill and coal mill - Google Patents

Abstract

The utility model relates to the field of coal mills in thermal power plants, and particularly discloses a primary air quantity measuring device of a coal mill. The primary air quantity measuring device of the coal mill can accurately measure the primary air quantity of the coal mill, so that the accuracy of automatic control of the power station boiler is ensured. In addition, the utility model also discloses a coal mill.

Description

Primary air quantity measuring device of coal mill and coal mill

Technical Field

The utility model relates to the field of coal mills in thermal power plants, in particular to a primary air quantity measuring device of a coal mill and the coal mill.

Background

Coal mills are extremely important equipment for coal-fired power plants to grind raw coal into fine coal powder required for charging. The primary air of the coal mill is used as conveying power for carrying the coal powder in the coal mill into the furnace, and the accurate measurement and automatic regulation control of the primary air quantity have great significance for the safety and stability of the unit.

However, the power plant is seriously puzzled by the fact that the primary air quantity cannot be accurately measured for a long time, at present, as the thermal power unit is larger and larger in scale, corresponding equipment in the power plant is more compact, the length of a straight pipe section of a primary air duct is shorter, air flow is more turbulent, cold and hot air cannot reach the degree of full mixing, measured data are not representative, errors are larger, and an automatic control system of a power station boiler cannot accurately control.

In view of the foregoing, it is desirable to provide a primary air flow measuring device for a coal pulverizer, so as to solve or overcome the above-mentioned technical problems.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a primary air quantity measuring device of a coal mill, which can accurately measure the primary air quantity of the coal mill, thereby improving the accuracy of automatic control of a power station boiler.

In addition, the technical problem to be solved by the utility model is to provide a coal mill which is provided with the primary air quantity measuring device, so that the primary air quantity of the coal mill can be accurately measured, and the accuracy of automatic control of a power station boiler is improved.

In order to solve the technical problems, the utility model provides a primary air quantity measuring device of a coal mill, which comprises a hot air pipeline and a cold air pipeline connected with the hot air pipeline, wherein a spoiler is arranged at the joint of the hot air pipeline and the cold air pipeline, and a rectifying component is also arranged in the hot air pipeline.

Preferably, the rectifying assembly is further provided with a pressure measuring assembly, and the pressure measuring assembly comprises a static pressure measuring tube and a full pressure measuring tube.

Preferably, the rectifying component is a hollow cylindrical structural member, and a notch is formed in the bottom of the cylindrical structural member.

Preferably, the static pressure measuring tube and the full pressure measuring tube are respectively connected with a differential pressure transmitter, and the differential pressure transmitter is in signal connection with a control system.

Preferably, the turbulence member is an alloy member.

Preferably, the turbulence piece is welded in the hot air pipeline through a supporting piece, and the rectifying component is installed in the hot air pipeline in a hanging mode.

Preferably, the support member is provided with a non-slip mat for preventing the spoiler from sliding off.

Preferably, air quantity regulating valves for controlling the air quantity are arranged at the air inlets of the hot air pipeline and the cold air pipeline.

Preferably, the hot air duct is disposed perpendicular to the cold air duct.

The utility model further provides a coal mill, which comprises the primary air quantity measuring device of the coal mill.

Through the technical scheme, the utility model has the following beneficial effects:

the primary air quantity measuring device of the coal mill comprises the hot air pipeline and the cold air pipeline connected with the hot air pipeline, wherein a spoiler is arranged at the joint of the hot air pipeline and the cold air pipeline, and a rectifying component is also arranged in the hot air pipeline, so that the primary air quantity of the coal mill can be accurately measured, and the accuracy of automatic control of a power station boiler is improved.

Drawings

FIG. 1 is a schematic diagram of a primary air volume measuring device of a coal mill according to the utility model in a front view;

FIG. 2 is a schematic top view of the primary air volume measuring device of the coal mill;

Fig. 3 is a schematic view of a rectifying assembly of the primary air quantity measuring device of the coal mill.

Description of the reference numerals

1. A cold air duct; 2. a rectifying assembly; 3. a hot air duct; 4. a spoiler; 5. a pressure measurement assembly; 51. a static pressure measuring tube; 52. the tube was measured under full pressure.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

It should be noted first that, in the following description, some directional terms are used to clearly illustrate the technical solution of the present utility model, only for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and thus, features defining "first," "second," or the like, may explicitly or implicitly include one or more of such features.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model provides a primary air quantity measuring device of a coal mill, which is shown in figures 1 to 3 and comprises a hot air pipeline 3 and a cold air pipeline 1 connected with the hot air pipeline 3, wherein a spoiler 4 is arranged at the joint of the hot air pipeline 3 and the cold air pipeline 1, and a rectifying component 2 is also arranged in the hot air pipeline 3.

It should be noted that, in the field of traditional coal mills in thermal power plants, the straight pipe section of the primary air duct is generally shorter, the air flow flowing through the straight pipe section is more turbulent, and the purpose of fully mixing cold air and hot air cannot be achieved, so that the error of the measurement data of the mixed air is larger and is not representative. According to the primary air quantity measuring device of the coal mill, the spoiler 4 is arranged at the joint of the hot air pipeline 3 and the cold air pipeline 1, so that the penetration of cold air to hot air can be enhanced, the cold air and the hot air can be mixed in advance, and the mixing degree of cold air and hot air is improved. It should be noted that, the flow field distribution of the mixed air can be simulated through corresponding software, so that the installation position of the rectifying component 2 in the hot air pipeline 3 can be determined, the rectifying component 2 is usually arranged on a straight pipe section positioned at the downstream of the cold and hot air mixing section of the primary air flue, the rectifying effect is achieved on the mixed air, and the measurement accuracy is improved.

In some embodiments of the utility model, the fairing assembly 2 is further equipped with a pressure measurement assembly 5, the pressure measurement assembly 5 comprising a static pressure measurement tube 51 and a full pressure measurement tube 52. It should be noted that, the pressure measurement component 5 is inserted and arranged on the rectifying component 2, the design principle of the pressure measurement component 5 is mainly based on venturi effect, and the working principle is that, according to the venturi effect, when the mixed wind passes through the rectifying component 2, the flow speed of the mixed wind increases due to the fact that the flow cross section of the mixed wind becomes smaller, the flow speed of the mixed wind is inversely proportional to the flow cross section, when the mixed wind filled with the rectifying component 2 flows through the throttling element in the pipeline, the mixed wind forms local contraction at the throat of the venturi tube, so that the flow speed of the mixed wind increases, the static pressure decreases, and then the pressure difference formed by the static pressure and the dynamic pressure can be generated around the throat of the venturi tube. If the fluid flow of the mixed wind is larger, the pressure difference is larger, so that the fluid flow of the mixed wind can be measured according to the magnitude of the pressure difference, and it should be noted that the static pressure measuring tube 51 mainly measures the magnitude of static pressure, the total pressure measuring tube 52 measures the sum of static pressure and dynamic pressure, and the magnitude of dynamic pressure is obtained by subtracting the static pressure from the total pressure measured by the total pressure measuring tube 52. It should be noted that the rectifying component 2 may be installed in the hot air duct 3 in a hanging manner, or may be installed in the hot air duct 3 by providing a connecting piece on the rectifying component 2, and the connecting piece is installed in a bolt or welding manner.

In some embodiments of the present utility model, the fairing assembly 2 is a hollow cylindrical structural member with a slot provided in the bottom of the cylindrical structural member. It should be noted that, the appearance of rectifying component 2 is cylindric, its inside is hollow structure, cylindric rectifying component 2 thickness is 8mm-12mm, preferably 10mm, be provided with the notch that width is 3mm along rectifying component 2 length direction's bottom, after rectifying component 2 uses a period of time, dust or the impurity of mixed wind in the surrounding environment can fall its bottom, long-term pile up can influence the measurement accuracy of mixed wind, consequently, need regularly clear up the dust of rectifying component 2 bottom, be provided with dust collection device in the lower part of notch, when dust falls to dust collection device and gathers a certain amount, the staff carries out centralized processing with the dust.

In some embodiments of the present utility model, the static pressure measurement tube 51 and the full pressure measurement tube 52 are connected to a differential pressure transmitter, respectively, which is in signal connection with a control system. It should be noted that, the differential pressure transmitter is a device for measuring the pressure of a medium, which can convert the measured pressure into an electrical signal for control and recording, and is used for detecting the pressure of the medium through a pressure sensor, when the pressure changes, the resistance of the pressure sensor also changes, and the pressure sensor is converted into an electrical signal, the differential pressure transmitter converts the mixed wind pressure signals measured by the static pressure measuring tube 51 and the full pressure measuring tube 52 into an electrical signal, and the electrical signal is transmitted to the control system, and the control system correspondingly controls the temperature and time of the utility boiler according to the magnitude of the electrical signal, when the abnormality of the mixed wind pressure signal measured by the static pressure measuring tube 51 or the full pressure measuring tube 52 is found, the entered hot wind or cold wind is adjusted in time, so that the utility boiler works in an optimal state.

In some embodiments of the utility model, the spoiler 4 is an alloy piece. It should be noted that, the material of the spoiler 4 is metal, which has sufficient strength, good corrosion resistance and high working stability, and preferably, the spoiler 4 is a nickel-based metal member, which can withstand extreme conditions without losing structural integrity, and has good heat resistance, and can withstand high temperatures without being significantly deformed or losing function. It should be noted that the spoiler 4 is provided with a support member, which may be mounted in the hot air duct 3 by means of bolts, flanges or welding. And the support piece is provided with an anti-slip pad, and the anti-slip pad can prevent the vortex piece 4 from sliding off from the hot air pipeline 3, so that the mixed wind cannot be mixed in advance.

In some embodiments of the present utility model, air quantity regulating valves for controlling the air quantity are arranged at the air inlets of the hot air pipeline 3 and the cold air pipeline 1. The air inlet of the hot air pipeline 3 and the air inlet of the cold air pipeline 1 are respectively provided with an air quantity regulating valve, when the air quantity is required to be regulated, the control system sends out a command, and the corresponding air quantity regulating valve is opened to control the air quantity of hot air or cold air so as to enable the power station boiler to be in an optimal working state. It should be noted that, in order to reduce energy loss of hot air or cold air during transportation, the hot air duct 3 is perpendicular to the cold air duct 1, so that working efficiency is ensured to the greatest extent.

As a relatively preferred embodiment of the primary air volume measuring device of the coal mill of the present utility model, it comprises: the hot air pipeline 3 and the cold air pipeline 1 that is connected perpendicularly with the hot air pipeline 3, the air intake department of hot air pipeline 3 and cold air pipeline 1 all is provided with the air regulation valve that is used for controlling the intake size, the junction of hot air pipeline 3 and cold air pipeline 1 is provided with vortex piece 4, vortex piece 4 is the alloy piece, weld in hot air pipeline 3 through the support piece, install the slipmat that is used for preventing the landing of vortex piece 4 on the support piece, still be provided with the fairing assembly 2 in the hot air pipeline 3, the fairing assembly 2 is installed in hot air pipeline 3 through the mode of hanging, still install pressure measurement subassembly 5 on the fairing assembly 2, pressure measurement subassembly 5 includes static pressure survey buret 51 and full pressure survey buret 52, static pressure survey buret 51 and full pressure survey buret 52 are connected with differential pressure transmitter respectively, differential pressure transmitter and control system signal connection, fairing assembly 2 is hollow cylindric structure, cylindric structure's bottom is provided with the notch.

In the working process, through setting up spoiler 4, can strengthen cold wind to hot-blast infiltration to can make cold wind and hot-blast mix in advance, improve cold and hot wind mixing degree, rectifier module 2 plays the rectification effect to the mixed wind, differential pressure transmitter is with the mixed wind pressure signal conversion that static pressure survey pipe 51 and full pressure survey pipe 52 measured into the electrical signal, thereby can accurately measure the primary air volume of coal pulverizer, again convey the electrical signal to control system, control system is in the best operating mode according to the corresponding temperature and the time of control power station boiler of the size of electrical signal, power station boiler automated control's precision has been improved.

The utility model further provides a coal mill, which is provided with the primary air quantity measuring device of the coal mill, so that the primary air quantity of the coal mill can be accurately measured, and the accuracy of automatic control of the power station boiler is improved.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present utility model within the scope of the technical concept of the present utility model, and all the simple modifications belong to the protection scope of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Moreover, any combination of the various embodiments of the utility model can be made without departing from the spirit of the utility model, which should also be considered as disclosed herein.

Claims (10)

1. The utility model provides a coal pulverizer air quantity measuring device, its characterized in that includes hot air duct (3) and with cold air duct (1) that hot air duct (3) are connected, hot air duct (3) with the junction of cold air duct (1) is provided with vortex piece (4), still be provided with in hot air duct (3) rectifier module (2).

2. The primary air quantity measuring device of the coal mill according to claim 1, characterized in that a pressure measuring assembly (5) is further installed on the rectifying assembly (2), and the pressure measuring assembly (5) comprises a static pressure measuring tube (51) and a full pressure measuring tube (52).

3. The primary air quantity measuring device of the coal mill according to claim 2, wherein the rectifying component (2) is a hollow cylindrical structural member, and a notch is formed in the bottom of the cylindrical structural member.

4. The primary air quantity measuring device of a coal mill according to claim 2, characterized in that the static pressure measuring tube (51) and the full pressure measuring tube (52) are respectively connected with a differential pressure transmitter, which is in signal connection with a control system.

5. The primary air quantity measuring device of a coal mill according to claim 1, characterized in that the turbulence member (4) is an alloy member.

6. The primary air quantity measuring device of the coal mill according to claim 1, wherein the turbulence piece (4) is welded in the hot air pipeline (3) through a supporting piece, and the rectification component (2) is installed in the hot air pipeline (3) in a hanging mode.

7. The primary air quantity measuring device of a coal mill according to claim 6, wherein the support member is provided with an anti-slip pad for preventing the turbulence member (4) from slipping off.

8. The primary air volume measurement device of a coal mill according to any one of claims 1 to 7, characterized in that air volume adjusting valves for controlling the air volume are arranged at air inlets of the hot air duct (3) and the cold air duct (1).

9. The coal mill primary air quantity measuring device according to claim 8, characterized in that the hot air duct (3) is arranged perpendicular to the cold air duct (1).

10. A coal mill comprising the coal mill primary air volume measuring device according to any one of claims 1 to 9.