A bladeless pneumatic flow guiding and rectifying system

Abstract

A bladeless pneumatic flow guiding and rectifying system, comprising several groups of type-I nozzle groups arranged on the inner arc side of a flue and several groups of type-II nozzle groups arranged on the inner arc side of the flue. Both the type-I nozzle groups and the type-II nozzle groups are connected to a compressed air tank, and monitoring instrument groups are arranged at both the air inlet and the air outlet of the flue. When the bladeless pneumatic flow guiding and rectifying system of the present invention is in specific operation, the air volume entering the nozzles can be adjusted in a timely manner according to the resistance data fed back in real time, so as to achieve the purpose of optimizing the flow field. Compared with the conventional flow guiding and rectifying plates or blade designs, after canceling the blades, not only is the construction convenient and simple, without the need to transform the shape of the flue, saving a large amount of materials and construction period, but also the real-time adjustability of the flow field optimization is realized, making the effect of the flow field optimization closer to the result of numerical simulation, and greatly improving the efficiency of the flow field optimization.

Description

Technical Field

[0001] The invention belongs to the fields of refined control of flow field, drag reduction and energy conservation, and particularly relates to a bladeless pneumatic diversion and rectification system. Background Art

[0002] In order to optimize the flow field of the flue gas, air and pulverized coal pipelines in thermal power plants and reduce the resistance, usually several groups of diversion, flow equalizing plates or vanes with different forms are added in the pipelines. However, the arrangement of the diversion and flow equalizing plates is often limited by the internal structure of the flue, thus affecting the diversion and flow equalizing effects and deviating from the results of numerical simulation. Especially in the flue gas ducts in the low-temperature section, anti-corrosion treatment is required on both sides of the vanes, which has a large construction difficulty and consumes materials. Summary of the Invention

[0003] The purpose of the invention is to overcome the above-mentioned disadvantages of the prior art and provide a bladeless pneumatic diversion and rectification system, which can effectively improve the diversion and rectification accuracy and save materials.

[0004] To achieve the above purpose, the technical scheme adopted by the invention is as follows:

[0005] A bladeless pneumatic diversion and rectification system includes several groups of type I nozzle groups arranged on the inner arc side of the flue and several groups of type II nozzle groups arranged on the inner arc side of the flue. Both the type I nozzle groups and the type II nozzle groups are connected to a compressed air tank, and monitoring instrument groups are arranged at both the air inlet and the air outlet in the flue.

[0006] The invention is further improved in that the type I nozzle groups and the type II nozzle groups are connected to the compressed air tank through pipelines 7.

[0007] The invention is further improved in that control valve groups 3 are arranged on the pipelines between the type I nozzle groups and the compressed air tank, and control valve groups 3 are arranged on the pipelines between the type I nozzle groups and the type II nozzle groups 5.

[0008] The invention is further improved in that the type I nozzle groups include several groups of convergent nozzles.

[0009] The invention is further improved in that the type II nozzle groups include several groups of divergent nozzles.

[0010] The invention is further improved in that the control valve groups include several manual, pneumatic or electric valves.

[0011] The invention is further improved in that the monitoring instrument groups include several pressure and differential pressure transmitters.

[0012] The invention is further improved in that there are multiple compressed air tanks, which are arranged outside the flue.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present invention, by setting the type-I nozzle group, type-II nozzle group and monitoring instrument group, the resistance values measured in real time by the monitoring instrument group are used to adjust the control valve group to achieve appropriate gas flow rates in the high-speed area and low-speed area, so as to achieve the purpose of flow field optimization. When the bladeless pneumatic diversion and rectification system of the present invention is specifically operated, the gas volume entering the nozzle can be adjusted in a timely manner according to the resistance data fed back in real time, so as to achieve the purpose of flow field optimization. Compared with the conventional diversion, rectification plate or blade design, after canceling the blades, not only the construction is convenient and simple, there is no need to transform the shape of the flue, saving a large amount of materials and construction period, but also the real-time adjustment of flow field optimization is realized, making the effect of flow field optimization closer to the result of numerical simulation, and greatly improving the efficiency of flow field optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention.

[0016] Among them, 1 is the flue, 2 is the compressed air tank, 3 is the control valve group, 4 is the type-I nozzle group, 5 is the type-II nozzle group, 6 is the monitoring instrument group, and 7 is the pipeline. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings:

[0018] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0020] Reference Figure 1, the bladeless pneumatic diversion and rectification system of the present invention includes a compressed air tank 2, a control valve group 3, a type-I nozzle group 4, a type-II nozzle group 5, a monitoring instrument group 6, and a pipeline 7; among them, several groups of type-I nozzle groups 4 are arranged on the outer arc side of the flue 1, and several groups of type-II nozzle groups 5 are arranged on the inner arc side. The type-I nozzle group 4 and the type-II nozzle group 5 are jointly connected to the compressed air tank 2 through the pipeline 7. A control valve group 3 is provided on the pipeline between the type-I nozzle group 4 and the compressed air tank 2, and a control valve group 3 is provided on the pipeline between the type-I nozzle group 4 and the type-II nozzle group 5. The control valve group 3 controls the amount of compressed air entering each group of nozzles. Measuring points are arranged before and after the flue 1, and the change of resistance is monitored in real time through the monitoring instrument group 6.

[0021] The type-I nozzle group 4 consists of several groups of convergent nozzles at a certain angle with the flue. Compressed air is sprayed into the pipeline through the nozzles. Due to the entrainment effect of the air flow, the overall air flow velocity in this area will increase.

[0022] The type-II nozzle group 5 consists of several groups of divergent nozzles at a certain angle with the flue. Compressed air is sprayed into the pipeline through the nozzles. Due to the diffusion effect of the air flow, the overall air flow velocity in this area will decrease.

[0023] The monitoring instrument group 6 is respectively arranged at appropriate positions before and after the type-I nozzle group 4 and the type-II nozzle group 5 in the flue 1 for real-time monitoring of the change of flue resistance.

[0024] The control valve group 3 consists of several manual, pneumatic or electric valves. The control valve group 3 respectively controls and adjusts the air flow pressure, flow rate, etc. of different nozzle groups through the resistance parameters real-time fed back by the monitoring instrument group 6.

[0025] The monitoring instrument group 6 consists of several pressure and differential pressure transmitters.

[0026] The air flow field in the pipeline is disordered. The main reason is that when the air flow passes through irregular cross-sections such as pipeline bends and diameter changes, high-speed areas and low-speed areas appear in the flow field. The purpose of optimizing the flow field is to reduce the high-speed and low-speed areas and make the air flow velocity in the whole pipeline close. After determining the disordered area of the pipeline flow field with the help of a flow field numerical simulation tool or experimental measurement data, several compressed air tanks 2 are arranged at appropriate positions outside the flue as gas storage equipment. Several groups of type-I nozzle groups 4 are arranged in the high-speed areas in the flue, and several groups of type-II nozzle groups 5 are arranged in the low-speed areas. Through the resistance values measured in real time by the monitoring instrument group 6, the control valve group 3 is adjusted to make the gas flow velocities in the high-speed and low-speed areas reach appropriate values, achieving the purpose of flow field optimization.

[0027] The present invention realizes the purpose of air flow diversion and rectification by setting several groups of nozzles with different structural forms that can be adjusted in real time in the disordered area of the flow field in the flue 1, and respectively increasing the air flow velocity in the low-speed area and decreasing the air flow velocity in the high-speed area through the entrainment and diffusion phenomena of the air flow.

[0028] Compared with the conventional method of optimizing the flow field by adding fixed flow guiding, rectifying plates or blades, the focus of the present invention is to adjust the air flow velocity in the flow field in real time according to the monitoring data, avoiding the disadvantage that it is not easy to replace the fixed blade type flow guiding and rectifying plates once they are installed and the effect is not good. It has small investment, simple construction, short cycle and saves materials; the equipment is light and almost no interference problem with the internal structure of the flue needs to be considered.

[0029] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation of the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. Any changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the specification of this invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A bladeless pneumatic flow guiding and rectifying system, characterized in that It includes several groups of type-I nozzle groups (4) arranged on the outer arc side of the flue (1) and several groups of type-II nozzle groups (5) arranged on the inner arc side of the flue (1). Both the type-I nozzle groups (4) and the type-II nozzle groups (5) are connected to the compressed air tank (2). Monitoring instrument groups (6) are arranged at both the air inlet and the air outlet in the flue (1); The type-I nozzle groups (4) include several groups of convergent nozzles; The type-II nozzle groups (5) include several groups of divergent nozzles; The monitoring instrument groups (6) include several pressure and differential pressure transmitters.

2. The bladeless pneumatic flow guiding and rectifying system according to claim 1, wherein The type-I nozzle groups (4) and the type-II nozzle groups (5) are connected to the compressed air tank (2) through pipelines (7).

3. The bladeless pneumatic flow guiding and rectifying system according to claim 2, wherein Control valve groups (3) are arranged on the pipelines between the type-I nozzle groups (4) and the compressed air tank (2), and control valve groups (3) are arranged on the pipelines between the type-I nozzle groups (4) and the type-II nozzle groups (5).

4. A bladeless pneumatic flow guiding and rectifying system according to claim 1, characterized in that, The control valve groups (3) include several manual, pneumatic or electric valves.

5. A bladeless pneumatic flow guiding and rectifying system according to claim 1, characterized in that, There are multiple compressed air tanks (2), which are arranged outside the flue.

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