CN215917758U

CN215917758U - Novel cold and hot primary air mixing device

Info

Publication number: CN215917758U
Application number: CN202121594947.1U
Authority: CN
Inventors: 郭艳玲
Original assignee: Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
Current assignee: Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2022-03-01
Anticipated expiration: 2031-07-14

Abstract

The utility model discloses a novel cold and hot primary air mixing device which comprises a cold primary air pipeline and a hot primary air pipeline, wherein the hot primary air pipeline consists of a first pipeline, an elbow pipeline, a second pipeline and a third pipeline which are sequentially arranged from top to bottom, a coal mill inlet is formed in one end, away from the second pipeline, of the third pipeline, a cold and hot primary air mixer is arranged at the communication position of one end of the cold primary air pipeline and the first pipeline on the hot primary air pipeline, and an elbow guide plate assembly is arranged in an inner cavity of the elbow pipeline. The utility model has reasonable structural design, is convenient for mixing cold air and hot primary air more uniformly, and improves the accuracy of primary air quantity measurement, thereby being beneficial to the automatic normal input of air quantity.

Description

Novel cold and hot primary air mixing device

Technical Field

The utility model relates to the technical field of air ducts, in particular to a novel cold and hot primary air mixing device.

Background

Along with the development of the thermal generator set to high capacity and high parameter, the air duct system is more complex, and the accurate measurement of the air volume is more and more difficult to realize. Because the air duct structure of the boiler is influenced by factors such as equipment installation, site arrangement and the like, most of the front and rear straight pipe sections of the air volume measuring section are limited, an effective flow guide device is lacked, the air flow distribution is not uniform, and the flow field deviates from the conditions of accurate air volume measurement to a large extent, so that the data measured by the air volume measuring device has large fluctuation and poor stability, especially the instability of a primary air volume measuring result at the inlet of a coal mill, the reasonable air distribution control of boiler combustion and the automatic reliable input of combustion are seriously influenced, and the existing primary air duct flow guide technology is mainly provided with a mixed flow device in an air duct, so that the risk of air duct resistance increase exists, and therefore, a novel cold-hot primary air mixing device is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the problems in the prior art and provides a novel cold-hot primary air mixing device, which is convenient for mixing cold air and hot primary air more uniformly and reducing the condition of disorder of an air channel flow field, thereby improving the accuracy of primary air quantity measurement and being beneficial to normal automatic input of air quantity.

In order to achieve the technical purpose and achieve the technical effect, the utility model is realized by the following technical scheme:

a novel cold and hot primary air mixing device comprises a cold primary air pipeline and a hot primary air pipeline, wherein the hot primary air pipeline consists of a first pipeline, an elbow pipeline, a second pipeline and a third pipeline which are sequentially arranged from top to bottom, and one end, far away from the second pipeline, of the third pipeline is provided with a coal mill inlet;

and a cold and hot primary air mixer is arranged at the communication position of one end of the cold primary air pipeline and the first pipeline on the hot primary air pipeline, and an elbow guide plate assembly is arranged in the inner cavity of the elbow pipeline.

Preferably, the cold and hot primary air mixer comprises an annular channel, rectangular grids are arranged on the upper, lower, left, right and periphery of an inner cavity of the annular channel, the annular channel is fixedly installed on the first pipeline, and the inner cavity of the annular channel is communicated with the inner cavity of the first pipeline.

Based on above-mentioned technical characteristics, be convenient for during cold wind gets into first pipeline in the annular passage.

Preferably, the bottom of the annular channel is communicated with a divergent pipeline, and the bottom of the divergent pipeline is communicated with the output end of the cold primary air pipeline.

Based on the technical characteristics, the cold air output end of the cold primary air pipeline is increased, so that cold air can rapidly enter the annular channel in a large range.

Preferably, the lower rectangular grid is located at the center of the bottom of the inner cavity of the annular channel, and the lower rectangular grid occupies 1/4 bottom area.

Based on the technical characteristics, the cold air can flow into the first pipeline from four directions through the rectangular grating in the annular channel.

Preferably, the elbow guide plate assembly is concentric with the elbow pipeline, the elbow guide plate assembly is composed of two groups of 90-degree arc guide plates, and an inner cavity of the elbow pipeline is divided into three equal-width guide channels through the two groups of 90-degree arc guide plates.

Based on the technical characteristics, the more uniform diversion conveying at the elbow pipeline after the cold primary air and the hot primary air are mixed is facilitated.

Preferably, the other end of the cold primary air pipeline is provided with a cold air inlet.

Based on the technical characteristics, cold air can conveniently enter the cold primary air pipeline from the cold air inlet to be conveyed.

Preferably, one end of the first pipeline, which is far away from the elbow pipeline, is provided with a hot air inlet.

Based on the technical characteristics, hot air can conveniently enter the hot primary air pipeline from the hot air inlet for conveying.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model has reasonable structural design, and one specific application of the embodiment is as follows: compared with a conventional cold-hot primary air mixing device, on one hand, a cold-hot primary air mixer is additionally arranged outside the communicated part of the cold primary air pipeline and the hot primary air pipeline, and on the other hand, an elbow guide plate assembly is additionally arranged in an elbow pipeline of the hot primary air pipeline, so that cold and hot primary air are mixed more uniformly, the condition that an air channel flow field is disordered is reduced, the primary air quantity measurement accuracy is improved, and the normal input of air quantity automation is facilitated.

Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a conventional hot and cold primary air mixing device;

FIG. 2 is a schematic structural diagram of a novel hot and cold primary air mixing device according to the present invention;

FIG. 3 is a schematic view of the connection between the primary air mixer and the first pipeline;

FIG. 4 is a schematic structural diagram of a primary air mixer for cooling and heating according to the present invention;

FIG. 5 is a right side view of FIG. 4 of the present invention;

FIG. 6 is a front view of FIG. 4 of the present invention;

FIG. 7 is a schematic structural view of an elbow baffle assembly of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1-cold primary air pipeline, 101-cold air inlet, 2-hot primary air pipeline, 201-first pipeline, 202-second pipeline, 203-third pipeline, 204-elbow pipeline, 205-coal mill connecting inlet, 3-elbow guide plate assembly, 4-cold and hot primary air mixer, 401-rectangular grid, 402-annular channel and 403-divergent pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, a novel cold-hot primary air mixing device includes a cold primary air pipeline 1 and a hot primary air pipeline 2, the hot primary air pipeline 2 is composed of a first pipeline 201, an elbow pipeline 204, a second pipeline 202 and a third pipeline 203 which are sequentially arranged from top to bottom, a coal mill inlet 205 is arranged at one end of the third pipeline 203 far away from the second pipeline 202, and a hot air inlet is arranged at one end of the first pipeline 201 far away from the elbow pipeline 204, so that hot air can enter the hot primary air pipeline 2 from the hot air inlet for conveying;

the cold and hot primary air mixer 4 is arranged at the communication position of one end of the cold primary air pipeline 1 and the first pipeline 201 on the hot primary air pipeline 2, the cold air inlet 101 is arranged at the other end of the cold primary air pipeline 1, cold air can conveniently enter the cold primary air pipeline 1 from the cold air inlet 101 to be conveyed, the cold and hot primary air mixer 4 comprises an annular channel 402, rectangular grids 401 are respectively arranged on the upper, lower, left and right sides of the inner cavity of the annular channel 402, the annular channel 402 is fixedly arranged on the first pipeline 201, the inner cavity of the annular channel 402 is communicated with the inner cavity of the first pipeline 201, cold air in the annular channel 402 can conveniently enter the first pipeline 201, a gradually expanding pipeline 403 is communicated with the bottom of the annular channel 402, the bottom of the gradually expanding pipeline 403 is communicated with the output end of the cold primary air pipeline 1, the cold air output end of the cold primary air pipeline 1 is increased, and cold air can conveniently and rapidly enter the annular channel 402 in a wider range, the lower rectangular grid 401 is positioned at the center of the bottom of the inner cavity of the annular channel 402, and the lower rectangular grid 401 occupies 1/4 of the bottom area, so that cold air can flow into the first pipeline 201 from four directions through the rectangular grid 401 in the annular channel 402;

the inner cavity of the elbow pipeline 204 is provided with an elbow guide plate component 3, the elbow guide plate component 3 is concentric with the elbow pipeline 204, the elbow guide plate component 3 is composed of two groups of 90-degree arc guide plates, the inner cavity of the elbow pipeline 204 is divided into three guide channels with equal width through the two groups of 90-degree arc guide plates, and the guide channels are convenient for guiding and conveying cold and hot primary air more uniformly at the elbow pipeline 204 after being mixed.

One specific application of this embodiment is: the utility model has reasonable structural design, and the cold and hot primary air mixing device at the inlet of the coal mill is designed, compared with the conventional cold and hot primary air mixing device, firstly, a cold and hot primary air mixer 4 is additionally arranged outside the communicated part of a cold primary air pipeline 1 and a hot primary air pipeline 2, then, an elbow guide plate component 3 is additionally arranged in an elbow pipeline 204 of the hot primary air pipeline 2, cold air is conveyed into a cold primary air pipeline 1 by conveying hot air into a first pipeline 201, cold air is conveyed into a gradually expanding pipeline 403 from the cold primary air pipeline 1, and is expanded into an annular channel 402 by the gradually expanding pipeline 403, so that the cold air enters the annular channel 402 and then is converged into the first pipeline 201 from four directions through a rectangular grid 401, thereby the cold and hot primary air is mixed more uniformly, the mixed cold and hot primary air is conveyed into the elbow pipeline 204, and the cold and hot primary air is convenient for mixing, The hot primary air is more uniformly guided and conveyed into the second pipeline 202 at the elbow pipeline 204 after being mixed, so that the influence on the resistance of the air duct system is small, the condition of disorder of the air duct flow field is reduced, the primary air quantity measurement accuracy is improved, and the automatic normal input of the air quantity is facilitated.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a novel wind mixing arrangement is once spent to cold and hot, includes wind pipeline (1) and hot wind pipeline (2) once, its characterized in that: the hot primary air pipeline (2) is composed of a first pipeline (201), an elbow pipeline (204), a second pipeline (202) and a third pipeline (203) which are sequentially arranged from top to bottom, and a coal mill inlet (205) is arranged at one end, far away from the second pipeline (202), of the third pipeline (203);

the one end of cold primary air pipeline (1) and the intercommunication department of first pipeline (201) on hot primary air pipeline (2) are provided with cold and hot primary air blender (4), the inner chamber of elbow pipeline (204) is provided with elbow guide plate subassembly (3).

2. The novel primary air cooling and heating mixing device as claimed in claim 1, wherein: the cold and hot primary air mixer (4) comprises an annular channel (402), rectangular grids (401) are arranged on the upper, lower, left, right, and periphery of an inner cavity of the annular channel (402), the annular channel (402) is fixedly mounted on the first pipeline (201), and the inner cavity of the annular channel (402) is communicated with the inner cavity of the first pipeline (201).

3. The novel primary air cooling and heating mixing device as claimed in claim 2, wherein: the bottom of the annular channel (402) is communicated with a divergent pipeline (403), and the bottom of the divergent pipeline (403) is communicated with the output end of the cold primary air pipeline (1).

4. The novel primary air cooling and heating mixing device as claimed in claim 2, wherein: the lower rectangular grid (401) is positioned at the center of the bottom of the inner cavity of the annular channel (402), and the lower rectangular grid (401) occupies 1/4 bottom area.

5. The novel primary air cooling and heating mixing device as claimed in claim 1, wherein: the elbow guide plate assembly (3) is concentric with the elbow pipeline (204), the elbow guide plate assembly (3) is composed of two groups of 90-degree arc guide plates, and the inner cavity of the elbow pipeline (204) is divided into three equal-width guide channels through the two groups of 90-degree arc guide plates.

6. The novel primary air cooling and heating mixing device as claimed in claim 1, wherein: and a cold air inlet (101) is formed in the other end of the cold primary air pipeline (1).

7. The novel primary air cooling and heating mixing device as claimed in claim 1, wherein: one end of the first pipeline (201) far away from the elbow pipeline (204) is provided with a hot air inlet.