High-efficiency oxygen-enriched mixing device based on optimization of Roots blower muffler structure

Abstract

The utility model discloses a kind of high-efficiency oxygen-enriched mixing device based on Roots blower muffler structure optimization, high-efficiency oxygen-enriched mixing device includes air intake muffler and oxygen dispersion mixing device structure, air intake muffler below is connected to Roots blower air inlet through flange, top is connected with oxygen dispersion mixing device structure through flange.Oxygen is accessed high-efficiency oxygen-enriched mixing device upper cover center position through pipeline, after entering, evenly spread on buffer plate, after buffering stable pressure, with a certain angle, speed evenly sprays into through diffusion orifice plate, and air below is converged, after evenly mixing, enter Roots blower suction port.The utility model optimizes structure design under the premise of not changing original Roots blower import aerodynamics design and noise treatment, sufficiently guarantee mixing effect while reducing import resistance, realize efficient low-consumption safe mixing oxygen-enriched gas.

Description

Technical Field

[0001] This utility model relates to the field of industrial kiln technology, specifically to a high-efficiency oxygen-enriched mixer based on the optimized structure of a Roots blower silencer. Background Technology

[0002] Currently, the application of industrial oxygen-enriched combustion technology is increasing. The sources of oxygen enrichment are mainly divided into direct production of oxygen-enriched gas and the production of oxygen-enriched gas by mixing high-purity oxygen with air or other gases (such as nitrogen, carbon dioxide, etc.). The latter mixing method is relatively widely used due to its advantages such as utilizing oxygen in the air to reduce energy consumption, being able to mix inert gases, and having a large range of concentration adjustment. Therefore, how to efficiently, low-consumption, and safely mix and produce oxygen-enriched gas is particularly important.

[0003] Because oxygen-enriched gas is often used in applications requiring pressurization before being delivered to the application location, the mixing method can be divided into pre-pressurization and post-pressurization. Pre-pressurization, as the name suggests, involves mixing the gas to the required concentration before the pressurization equipment, while post-pressurization involves mixing the gas after the pressurization equipment. Post-pressurization often requires high-purity oxygen itself to be pressurized to a pressure greater than the operating pressure of the mixed gas, or it requires additional pressurization equipment to achieve the mixing of oxygen-enriched gas. Both of these methods involve increasing energy consumption.

[0004] Existing pre-compressor mixers often replace the existing inlet silencer and filtration system of the booster equipment with a separately designed mixer. However, this alters the inlet hydrodynamic design of the original booster equipment, increasing inlet resistance, changing the dynamic balance of the casing and motor, and altering the fan noise design. This increases the design complexity and ultimately leads to increased energy consumption, equipment vibration, or noise. In practical applications, numerous problems have arisen due to the addition of mixers, resulting in increased inlet resistance, increased fan vibration, and increased noise. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency oxygen-enriched mixer based on the optimized structure of a Roots blower silencer, in order to overcome the shortcomings of the existing technology.

[0006] The present invention adopts the following technical solution:

[0007] This utility model includes:

[0008] A booster unit with an air inlet and an oxygen-enriched outlet;

[0009] A silencer connected in series with the air inlet, wherein the original airflow channel is maintained inside the silencer and an oxygen diffusion and mixing unit is added;

[0010] The oxygen diffusion and mixing unit is equipped with an oxygen inlet, a diffusion plate and a buffer plate, used to diffuse high-concentration oxygen into the air channel to form an oxygen-rich mixed gas upstream of the booster host.

[0011] An oxygen concentration detection element is sequentially arranged downstream and / or upstream of the silencer along the airflow direction, and a flow rate regulating element is arranged at the oxygen inlet;

[0012] The control unit receives the feedback signal from the oxygen concentration detector and adjusts the flow regulator accordingly to stabilize the oxygen concentration at the target value.

[0013] Furthermore, the dispersion plate has multiple rows of dispersion holes, and the diameter and opening ratio of each row of holes vary gradually along the airflow direction, so that the oxygen ejection velocity is ≤10m / s.

[0014] Furthermore, the dispersion plate is installed at an angle of 5°–45° to form a forward spray and entrain surrounding air.

[0015] Furthermore, the buffer plate is located upstream of the dispersion plate, and a buffer cavity is formed between the two to weaken the impact of the oxygen jet and stabilize pressure fluctuations.

[0016] Furthermore, the muffler housing retains the original sound-absorbing lining and air filter, and the oxygen diffusion and mixing unit is fixed inside the housing in a modular insertion manner, without changing the original shape and interface size of the muffler.

[0017] Furthermore, the oxygen concentration detection device includes a pre-machine detector and a post-machine detector, located at the muffler outlet and the booster main unit outlet, respectively, to achieve closed-loop monitoring of the concentration before and after mixing.

[0018] Furthermore, the flow regulating component is an electric or pneumatic regulating valve connected in series with a flow meter, and the control unit performs PID regulation based on concentration-flow dual feedback.

[0019] Furthermore, downstream of the aforementioned detector, temperature and pressure sensors are also integrated, and their signals are connected to the control unit for temperature and pressure compensation under oxygen-enriched gas conditions.

[0020] Furthermore, the booster unit is a Roots blower, whose inlet is connected to the environment only through the silencer. The oxygen enrichment and mixing process is completed entirely by the blower's own negative pressure, without the need for additional oxygen pressure boosting equipment.

[0021] Furthermore, the silencer top cover is removable, and the oxygen diffusion and mixing unit is axially pull-out for easy online maintenance and orifice plate replacement.

[0022] The beneficial effects of this utility model are:

[0023] 1. The high-efficiency oxygen-enriched mixer based on the optimized structure of the Roots blower silencer of this utility model achieves efficient mixing of oxygen and air before the machine, without the need for additional pressurization equipment. It achieves mixing by relying on the suction of the original Roots blower, saving the cost and power consumption of adding pressurization equipment.

[0024] 2. This utility model solves the problems that the current method of replacing the entire silencer may cause by changing the original inlet fluid dynamics design of the Roots blower, increasing inlet resistance, changing the dynamic balance of the machine body and motor itself, and increasing blower noise. It reduces the design difficulty and avoids the hidden dangers of increased energy consumption, equipment vibration or increased noise.

[0025] 3. This utility model adopts the original silencer filtration system structure. Without damaging the original aerodynamic design and noise treatment of the air booster equipment inlet, it optimizes the structural design by adding a high-concentration oxygen input mixing unit. This fully ensures the mixing effect while reducing the inlet resistance. It also adds oxygen concentration detection before and after the machine, pressure and temperature sensors after the machine, and an automatic regulating valve to detect and adjust the oxygen concentration in real time, so as to achieve efficient, low-consumption and safe mixing of oxygen-enriched gas.

[0026] 4. This utility model is specially designed with an airflow buffer plate structure to reduce the airflow impact caused by direct oxygen intake, reduce pressure fluctuations, play a buffering and stabilizing role, and further ensure the mixing effect of oxygen-enriched gas.

[0027] 5. The dispersion plate structure designed in this utility model, after calculation, adopts a uniform arrangement of different apertures to fully ensure the uniformity of the oxygen injection surface and at the same time ensure the oxygen dispersion effect.

[0028] 6. The dispersion plate structure designed in this utility model is installed at a certain angle to ensure that the oxygen airflow direction is consistent with the airflow direction, avoiding the formation of an "airflow wall" and increasing resistance due to the forward injection of oxygen. At the same time, the forward injection can locally entrain the surrounding air, which can increase the mixing effect and reduce the inlet resistance.

[0029] In summary, this utility model adopts the original silencer filtration system structure. Without compromising the original aerodynamic design and noise control of the air booster equipment inlet, it optimizes the structural design by adding a high-concentration oxygen input mixing unit. This fully ensures the mixing effect while reducing inlet resistance. Furthermore, it adds pre- and post-machine oxygen concentration detection, post-machine pressure and temperature detection, and (oxygen) flow regulating valves to achieve efficient, low-consumption, and safe mixing of oxygen-enriched gas. Attached Figure Description

[0030] Figure 1 This is a side view of the overall structure of an embodiment of this application;

[0031] Figure 2This is a partial schematic diagram of the internal gas flow direction in an embodiment of this application;

[0032] Figure 3 This is a top view of the oxygen diffusion mixer structure according to an embodiment of this application;

[0033] Figure 4 This is a front view of the structure of the oxygen diffusion mixer according to an embodiment of this application.

[0034] Figure 5 This is a front view of the overall structure of an embodiment of this application. Detailed Implementation

[0035] The present invention will be further explained below with reference to the embodiments and accompanying drawings. The following embodiments are only used to illustrate the present invention, but are not intended to limit the scope of implementation of the present invention.

[0036] like Figure 1 , Figure 2 and Figure 5 As shown in the figure, this application embodiment provides a high-efficiency oxygen-enriched mixer based on the optimized structure of a Roots blower silencer. It includes an air intake silencer and an oxygen dispersion mixer. The oxygen dispersion mixer structure includes an oxygen delivery pipeline 1, a connecting flange 2, and an oxygen dispersion mixer 3. The oxygen delivery pipeline 1 and the oxygen dispersion mixer 3 are connected by the connecting flange 2. The air intake silencer structure includes an air intake silencer 4, an air inlet pipeline 17, and a blower oxygen-enriched inlet pipeline 18. Air enters from the lower end face of the air intake silencer 4 through the air inlet pipeline 17, mixes with the oxygen entering the oxygen dispersion mixer 3, and then enters the blower oxygen-enriched inlet pipeline 18 through a filter screen 21. The blower oxygen-enriched inlet pipeline 18 is connected to the connecting pipeline 13 and connected to the Roots blower 6 through a flange 5. Then it enters the Roots blower 6, is pressurized by the Roots blower 6, and enters the Roots blower oxygen-enriched outlet pipeline 8. The Roots blower 6 is connected to the oxygen-enriched outlet pipeline 8 through a flexible connection 7. The oxygen-enriched outlet pipe 8 then passes through the flexible connector 9 to the next section of the pipe, which delivers the oxygen to the user end. At the same time, a safety valve 10, an oxygen concentration detector 12, and pressure and temperature sensors 11 are installed on the pipe. The obtained oxygen concentration, temperature, and pressure data are fed back to the flow regulating valve 20 on the oxygen delivery pipe 1.

[0037] Preferably, the oxygen delivery pipeline 1 is also equipped with a flow meter 19 and a flow regulating valve 20, which are connected to the oxygen diffusion mixer 3 through a connecting flange 2, and then fixed to the top of the air intake silencer 4 through the cover hole bolts of the air intake silencer 4.

[0038] Preferably, oxygen concentration detectors are installed on both the oxygen-enriched inlet pipe 18 and the oxygen-enriched outlet pipe 8 of the blower. The data is fed back to the flow regulating valve 20 on the oxygen delivery pipe 1 in real time. The valve opening is adjusted in real time according to the needs to monitor the oxygen concentration, ensuring the accuracy and stability of the oxygen concentration. At the same time, it can also ensure the safety of oxygen enrichment. When the concentration is abnormal, the flow regulating valve 20 is adjusted or closed in time.

[0039] Preferably, the oxygen diffusion mixer 3 can be fixed inside the housing in a modular insertion manner without changing the original silencer shape and interface size. The oxygen diffusion mixer 3 is internally provided with an airflow buffer plate 15, an oxygen diffusion plate 14, and a detachable top cover plate 16. Figure 3 and Figure 4 The buffer plate 15 is located upstream of the oxygen diffusion plate 14, and a buffer cavity is formed between the two to weaken the impact of the oxygen jet and stabilize pressure fluctuations. Multiple rows of diffusion holes are provided on the oxygen diffusion plate 14, and are welded to the airflow buffer plate 15 at a designed angle.

[0040] Furthermore, the size and distribution of the pores on the oxygen dispersion plate 14 in the oxygen dispersion mixer 3 need to be matched with different opening ratios and arrangements according to the amount of oxygen. For example, the pore diameter and opening ratio of each row are gradient-changed along the airflow direction to ensure the uniformity of oxygen dispersion and a reasonable oxygen nozzle velocity. Ultimately, the injection velocity should not be too high (<10m / s) to avoid impacting the filter screen 21 of the oxygen-enriched inlet pipe of the blower, forming turbulence and increasing resistance.

[0041] Furthermore, the installation angle of the oxygen diffusion plate 14 in the oxygen diffusion mixer 3 is 5–45 degrees, and is selected according to the actual wind speed to ensure that the airflow can reduce resistance and achieve a good mixing effect during mixing.

[0042] The automatic control workflow of this utility model is as follows: Based on the set target concentration, and referring to the concentration data fed back by the oxygen enrichment concentration detectors installed before and after the machine, the oxygen flow regulating valve is automatically adjusted. For example, if the oxygen enrichment concentration is set to 36%, and the feedback oxygen enrichment concentration is higher than 36%, the oxygen flow regulating valve is automatically closed; if it is lower than 36%, the flow regulating valve is automatically opened. If the feedback oxygen concentration data fluctuation is greater than 5%, or exceeds the preset oxygen concentration upper limit, the oxygen flow regulating valve is automatically fully closed. If the oxygen concentration is lower than the set target value, and the flow regulating valve opening is adjusted by >5%, but the feedback oxygen concentration value does not change, a yellow warning is issued, and the valve opening is adjusted further. If the valve opening is adjusted by >10%, and the feedback oxygen data still does not change, a red warning is issued, valve adjustment is stopped, and the relevant equipment is prompted for on-site inspection.

[0043] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A high-efficiency oxygen-enriched mixer based on the optimized structure of a Roots blower silencer, characterized in that, include: A booster unit with an air inlet and an oxygen-enriched outlet; A silencer connected in series with the air inlet, wherein the original air flow channel is maintained inside the silencer and an oxygen diffusion and mixing unit is added; The oxygen diffusion and mixing unit is equipped with an oxygen inlet, a diffusion plate and a buffer plate, which are used to diffuse high-concentration oxygen into the air channel to form an oxygen-rich mixed gas upstream of the booster host. An oxygen concentration detection element is sequentially arranged downstream and / or upstream of the silencer along the airflow direction, and a flow rate regulating element is arranged at the oxygen inlet; The control unit receives the feedback signal from the oxygen concentration detector and adjusts the flow regulator accordingly to stabilize the oxygen concentration at the target value.

2. The high-efficiency oxygen-enriched mixer according to claim 1, characterized in that, The dispersion plate has multiple rows of dispersion holes, and the diameter and opening ratio of each row of holes vary gradually along the airflow direction, so that the oxygen ejection velocity is ≤10m / s.

3. The high-efficiency oxygen-enriched mixer according to claim 2, characterized in that, The dispersion plate is installed at an angle of 5°–45° to form a forward spray and entrain surrounding air.

4. The high-efficiency oxygen-enriched mixer according to any one of claims 1-3, characterized in that, The buffer plate is located upstream of the dispersion plate, and a buffer cavity is formed between the two to weaken the impact of the oxygen jet and stabilize pressure fluctuations.

5. The high-efficiency oxygen-enriched mixer according to claim 1, characterized in that, The muffler housing retains the original sound-absorbing lining and air filter. The oxygen diffusion and mixing unit is fixed inside the housing in a modular insertion manner, without changing the original shape and interface size of the muffler.

6. The high-efficiency oxygen-enriched mixer according to claim 1 or 5, characterized in that, The oxygen concentration detection device includes a pre-machine detector and a post-machine detector, located at the muffler outlet and the booster main unit outlet, respectively, to achieve closed-loop monitoring of the concentration before and after mixing.

7. The high-efficiency oxygen-enriched mixer according to claim 6, characterized in that, The flow regulating component is an electric or pneumatic regulating valve connected in series with a flow meter. The control unit performs PID regulation based on concentration-flow dual feedback.

8. The high-efficiency oxygen-enriched mixer according to claim 7, characterized in that, Downstream of the rear detector, temperature and pressure sensors are also integrated, and their signals are connected to the control unit for temperature and pressure compensation under oxygen-enriched gas conditions.

9. The high-efficiency oxygen-enriched mixer according to claim 1, characterized in that, The booster unit is a Roots blower, whose inlet is connected to the environment only through the silencer. The oxygen enrichment and mixing process is completed entirely by the blower's own negative pressure, without the need for additional oxygen pressure boosting equipment.

10. The high-efficiency oxygen-enriched mixer according to claim 1, characterized in that, The silencer top cover is removable, and the oxygen diffusion and mixing unit is axially pull-out for easy online maintenance and orifice plate replacement.

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