CN117899687B - Gao Xiaowa S mixing device - Google Patents
Gao Xiaowa S mixing device Download PDFInfo
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- CN117899687B CN117899687B CN202410315921.0A CN202410315921A CN117899687B CN 117899687 B CN117899687 B CN 117899687B CN 202410315921 A CN202410315921 A CN 202410315921A CN 117899687 B CN117899687 B CN 117899687B
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- 238000002156 mixing Methods 0.000 title claims abstract description 73
- 230000003068 static effect Effects 0.000 claims abstract description 115
- 238000009423 ventilation Methods 0.000 claims abstract description 60
- 239000012530 fluid Substances 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 238000005086 pumping Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 38
- 238000005192 partition Methods 0.000 description 20
- 238000002485 combustion reaction Methods 0.000 description 15
- 239000003245 coal Substances 0.000 description 8
- 238000004880 explosion Methods 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000013598 vector Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention relates to a high-efficiency gas mixing device, which comprises a barrel, wherein one end of the barrel is an air inlet end, the other end of the barrel is an air outlet end, the air inlet end is provided with a combined air inlet device, the combined air inlet device comprises a gas air inlet shell, a ventilation air inlet pipe and a gradually-expanding pipe, the maximum diameter end of the gradually-expanding pipe is arranged on the air inlet end, the gas air inlet shell comprises a gradually-reducing pipe section, the minimum diameter end of the gradually-reducing pipe section is connected with the minimum diameter end of the gradually-expanding pipe, the ventilation air inlet pipe is sleeved in the gas air inlet shell, an injection port is formed between the pipe orifice of the ventilation air inlet pipe and the gradually-reducing pipe section, a plurality of static mixers are arranged in the barrel from the air inlet end to the air outlet end, and are distributed at intervals along the axial direction of the barrel and are used for mixing gas pumped by a high negative pressure and low negative pressure pumping system with ventilation air, so that the mixed gas achieves safe, stable and uniform concentration.
Description
Technical Field
The invention relates to the technical field of coal mine gas treatment, in particular to a high-efficiency gas blending device.
Background
Gas is a combustible gas whose main component is methane, which is present in coal seams and is released as coal is mined. When the concentration of the gas is between the lower explosion limit (5% vol) and the upper explosion limit (15% vol), explosion occurs when exposed to open fire or high temperature, and serious casualties and property loss are caused. Therefore, the treatment and utilization of the gas are important links of coal mine safety production.
At present, the coal mine gas treatment and utilization modes mainly comprise the following steps:
(1) And (3) gas drainage: the gas is extracted from the coal seam through the high negative pressure and low negative pressure extraction systems and then is conveyed to ground or underground treatment equipment such as a gas generator set, a gas boiler and the like through pipelines, so that the gas is converted into electric energy or heat energy, and the utilization and emission reduction of the gas are realized.
(2) Burning gas: mixing the gas with air or other oxidants, and then burning in a combustion chamber or a combustion tower to convert methane in the gas into carbon dioxide and water, and simultaneously releasing heat to realize emission reduction and heat energy recovery of the gas.
(3) Thermal oxidation of gas regeneration: the method comprises the steps of mixing gas with air or other oxidants, and then burning in RTO, wherein the RTO is high-efficiency gas treatment equipment, and the principle is that heat of the burnt high-temperature gas is recovered by using a heat exchanger and then the heat is used for preheating the mixed gas entering the RTO, so that the concentration of the gas and the fuel consumption required by burning are reduced, and simultaneously, the emission of carbon dioxide is reduced, and the emission reduction and heat recovery of the gas are realized.
However, the above-mentioned methods of gas treatment and utilization have some problems and disadvantages, mainly including the following:
(1) The efficiency and effect of gas drainage are influenced by factors such as coal seam conditions, drainage parameters, pipeline arrangement and the like, the sufficient drainage and safe transportation of gas cannot be guaranteed, meanwhile, the concentration of gas drainage is often unstable, is sometimes higher than the upper explosion limit, is sometimes lower than the lower explosion limit, is sometimes in an explosion interval, and is unfavorable for the utilization and treatment of gas.
(2) The efficiency and effect of gas combustion are affected by factors such as gas concentration, air ratio, combustion temperature, combustion time and the like, the full combustion and complete oxidation of the gas cannot be ensured, carbon monoxide gas can be possibly generated, certain pollution is caused to the environment, and the heat after combustion cannot be effectively recycled.
(3) The efficiency and effect of the gas regeneration thermal oxidation are affected by factors such as gas concentration, combustion air proportion, RTO structure, heat exchanger performance and the like, so that the sufficient combustion and complete oxidation of the gas cannot be ensured, meanwhile, the RTO operation needs higher gas concentration and fuel consumption, the gas concentration is often unstable, is sometimes higher than the maximum allowable concentration of the RTO and is sometimes lower than the minimum allowable concentration of the RTO, and the safe and stable operation of the RTO is not facilitated.
(4) Ventilation air methane is coal mine gas, and refers to gas with methane concentration lower than 0.75% vol discharged by a mine ventilation system. The ventilation air methane concentration is too low to be directly utilized.
Therefore, in order to solve the above problems and disadvantages, the present invention provides a gas blending device and a blending method thereof, which are used for mixing the gas extracted by the high negative pressure and low negative pressure extraction system with ventilation air methane, so that the mixed gas can reach a safe, stable and uniform concentration, and can be introduced into RTO for combustion treatment, thereby improving the treatment efficiency and effect of the gas, and reducing the emission cost and environmental impact of the gas.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-efficiency gas blending device.
In order to achieve the above purpose, the invention provides a high-efficiency gas mixing device, which is mainly characterized by comprising a barrel, wherein one end of the barrel is an air inlet end, the other end of the barrel is an air outlet end, the air inlet end is provided with a combined air inlet device, the combined air inlet device comprises a gas air inlet shell, a ventilation air inlet pipe and a gradually-expanding pipe, the maximum diameter end of the gradually-expanding pipe is arranged on the air inlet end, the gas air inlet shell comprises a gradually-expanding pipe section, the minimum diameter end of the gradually-expanding pipe section is connected with the minimum diameter end of the gradually-expanding pipe, the ventilation air inlet pipe is sleeved in the gas air inlet shell, an injection port is formed between the pipe orifice of the ventilation air inlet pipe and the gradually-expanding pipe section, so that gas enters the gradually-expanding pipe through the injection port and the ventilation air inlet pipe from the ventilation air inlet pipe are mixed, the inside of the gradually-expanding pipe is provided with a plurality of static mixers from the air inlet end to the air outlet end, and the static mixers are distributed along the axial direction of the barrel.
Preferably, a plurality of swirl guide vanes are arranged in the tapered pipe section at intervals, and the swirl guide vanes are arranged between the outer surface of the ventilation air inlet pipe and the inner surface of the tapered pipe section.
Preferably, the gas inlet casing comprises a gas inlet pipe section, the gas inlet pipe section is arranged at the maximum diameter end of the tapered pipe section, and the gas inlet pipe section is connected with at least one gas inlet conduit.
Preferably, the plurality of static mixers comprises a first static mixer and a second static mixer, the second static mixer is used for rotating and flowing high-speed fluid of an upstream cylinder along the axial direction of the cylinder while flowing towards the periphery of the cylinder, the second static mixer is positioned between the first static mixer and the air inlet end, the first static mixer comprises a plurality of T-shaped structures, each T-shaped structure comprises a fin plate, the fin plate is provided with a fixed end and a free end along the length direction, the fixed end is mounted on the inner wall of the cylinder, the fin plate is provided with an increasing width from the free end to the fixed end, the free end is positioned closer to the air inlet end relative to the fixed end, the free end is positioned closer to the central axis of the cylinder, a first cavity is formed between the free ends of the plurality of T-shaped structures, 2 vortex flow plates are formed by each T-shaped structure, each vortex flow passes through the fin plate to the opposite vortex flow edges, and the vortex flow edges are increased along the vortex flow edges.
Preferably, the T-shaped structure includes a vertical support plate, and one side of the vertical support plate is vertically connected to the fin plate along the length direction of the fin plate.
Preferably, the fin plate is an arc plate, and the free end deflects toward a direction away from the central axis of the cylinder.
Preferably, the expansion plane of the fin plate is trapezoid-like, and the first static mixer comprises 6T-shaped structures which are centrosymmetric.
Preferably, the second static mixer comprises a plurality of supporting frames, each supporting frame is provided with a partition board, each partition board extends from the supporting frame towards the inner wall of the cylinder, the supporting frames extend from the inner wall of the cylinder to the center of the cylinder along the radial direction of the cylinder, each partition board is arranged along the direction vertical to the central axis of the cylinder, each partition board inclines towards the air outlet end, and high-speed fluid in the central area of the upstream cylinder is forced to change the flow direction and simultaneously makes rotary flow along the axial direction of the cylinder when moving towards the periphery of the cylinder through the second static mixer.
Preferably, the plurality of static mixers comprises a third static mixer, the third static mixer is located between the second static mixer and the air inlet end, the third static mixer comprises a plurality of annular baffles, each annular baffle is arranged along the direction perpendicular to the central axis of the cylinder, one side of each annular baffle is fixed on the inner wall of the cylinder, each annular baffle is inclined relative to the radial direction of the cylinder, a second cavity is formed between the tail ends of the plurality of annular baffles, fluid in the central area of the cylinder flows downstream from the second cavity through the third static mixer, fluid in the area around the cylinder is changed by the baffles, and peripheral annular flow is formed downstream from the baffles.
Preferably, the plurality of static mixers comprise a fourth static mixer, the fourth static mixer is located between the first static mixer and the air outlet end, the fourth static mixer is a grid type mixer, and the fourth static mixer is used for unifying flow directions so that the flow field tends to be stable.
Preferably, the plurality of static mixers comprise a first static mixer, a second static mixer, a third static mixer and a fourth static mixer, and the fluid sequentially passes through the third static mixer, the second static mixer, the first static mixer and the fourth static mixer to be mixed to form uniformly mixed gas, i.e. the static mixers sequentially comprise an I-stage baffle type static mixer, an II-stage baffle type static mixer, a III-stage fin type static mixer and an IV-stage rectification grid. The structure of the multistage static mixer increases the turbulence degree of the gas in the mixing device through different mixing mechanisms and modes, so that the mixing degree of the gas is increased, the components of the mixed gas are distributed more uniformly, the pressure loss of the mixing box is controlled within a reasonable range, the power consumption of the mixing fan is reduced, and the energy conservation of the mixing box is improved. The static pressure loss of the ventilation air side of the mixing device is less than or equal to 700Pa.
The third static mixer enables the gas in the central area of the cylinder body and the ventilation air methane in the peripheral area of the cylinder body to change and exchange in flow direction, so that the turbulence and the mixing degree of the gas are increased; the second static mixer makes the gas in the central area of the cylinder move towards the periphery of the cylinder and simultaneously make a rotary flow along the axial direction of the cylinder to mix with the gas close to the inner wall of the cylinder again; the first static mixer is used for enabling the gas to form a plurality of vortex flows with opposite rotation directions, increasing the vortex degree and the mixing degree of the gas, and reducing the pressure loss of the mixer; and the flow field of the gas tends to be stable and the flow direction is unified by the rectification grating of the fourth static mixer, so that the stable operation of downstream pipelines and equipment is facilitated.
Preferably, the device comprises a control unit, a gas control valve arranged at the gas inlet shell, a ventilation air control valve arranged at the ventilation air inlet pipe and a blending fan, wherein the control unit is respectively connected with the gas control valve, the ventilation air control valve and the blending fan, and the control unit is used for controlling the gas control valve and the ventilation air control valve according to the concentration of the blending gas at the blending fan so as to regulate the flow and the pressure of the gas inlet gas and the ventilation air. The concentration and the air quantity of the mixed gas are kept within the set range by detecting and adjusting the flow of the gas and the ventilation air methane, so that the safe and stable operation of RTO is ensured, and the frequent system shutdown and the faults of RTO caused by the large fluctuation range of the gas concentration are avoided.
The invention has the beneficial effects that:
The high-efficiency gas mixing device is used for mixing the gas extracted by the high negative pressure and low negative pressure extraction system with the ventilation air methane, and based on the combined air inlet device, the gas is injected into the cylinder body at a high speed through the injection port, so that the gas in the peripheral area in the cylinder body is primarily mixed with the ventilation air methane in the central area; based on the plurality of static mixers, the mixed gas is further mixed to reach safe, stable and uniform concentration so as to be led into RTO for combustion treatment.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a high efficiency gas blending device according to the present invention.
Fig. 2 is a second structural schematic diagram of the high efficiency gas blending device of the present invention.
FIG. 3 is an internal schematic view of the high efficiency gas blending apparatus of the present invention.
Fig. 4 is a schematic structural view of a combined air inlet device in the efficient gas blending device.
Fig. 5 is an enlarged partial schematic view of the circle of fig. 4.
FIG. 6 is a first schematic structural view of a first static mixer in the high efficiency gas blending apparatus of the present invention.
FIG. 7 is a second schematic diagram of the first static mixer of the high efficiency gas blender apparatus of the present invention.
Fig. 8 is a first structural schematic diagram of a third static mixer in the high efficiency gas blending apparatus of the present invention.
FIG. 9 is a second schematic structural view of a third static mixer in the high efficiency gas blender apparatus of the present invention.
FIG. 10 is a schematic view of a first configuration of a second static mixer in the high efficiency gas blender apparatus of the present invention.
FIG. 11 is a second schematic structural view of a second static mixer in the high efficiency gas blender apparatus of the present invention.
FIG. 12 is a schematic diagram of the structure of a fourth static mixer in the high efficiency gas blender apparatus of the present invention.
Fig. 13 is a flow field trace plot at a first static mixer in a high efficiency gas blending device of the present invention.
Fig. 14 is a graph of velocity vectors at the flow cross section of a first static mixer in a high efficiency gas blending apparatus of the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
Fig. 1 to 14 show an embodiment of the high efficiency gas blending device of the present invention. In this embodiment, taking the mixing of the gas and the ventilation air methane as an example, the gas pumped by the high negative pressure and low negative pressure pumping system can be mixed with the ventilation air methane, so that the mixed gas reaches safe, stable and uniform gas concentration, and is conveniently led into an RTO (regenerative thermal oxidizer) for combustion treatment, and the concentration deviation at the outlet section is less than or equal to +/-8%.
The device comprises a barrel 1, wherein one end of the barrel 1 is an air inlet end 2, the other end of the barrel 1 is an air outlet end 3, mixed gas is discharged from the air outlet end 3, the air inlet end 2 is provided with a combined air inlet device 4, the combined air inlet device 4 comprises a gas air inlet shell 29, a ventilation air inlet pipe 6 and a gradually-expanding pipe 13, the maximum diameter end of the gradually-expanding pipe 13 is arranged on the air inlet end 2, the gas air inlet shell 29 comprises a gradually-reducing pipe section 11, the minimum diameter end of the gradually-reducing pipe section 11 is connected with the minimum diameter end of the gradually-expanding pipe 13, and as shown in fig. 4 and 5, the minimum diameter end of the gradually-reducing pipe section 11 can be connected with the minimum diameter end of the gradually-expanding pipe 13 through a short pipe section. The diameter of the maximum diameter end of the diverging pipe 13 is the same as the diameter of the cylinder 1.
The ventilation air inlet pipe 6 is sleeved in the gas inlet shell 29, and an injection port 14 is formed between the pipe orifice of the ventilation air inlet pipe 6 and the tapered pipe section 11, so that the gas enters the gradually-expanding pipe 13 through the tapered pipe section 11 and the ventilation air entering from the ventilation air inlet pipe 6 through the injection port 14, namely, the gas is injected into the cylinder at a high speed, and the gas in the surrounding area in the cylinder is primarily mixed with the ventilation air in the central area.
In the invention, a plurality of static mixers are arranged in the cylinder 1 from the air inlet end 2 to the air outlet end 3, and the static mixers are distributed at intervals along the axial direction of the cylinder 1.
As shown in fig. 4 and 5, a plurality of swirl vanes 22 are disposed in the tapered pipe section 11 and are distributed at intervals, the swirl vanes 22 are disposed between the outer surface of the ventilation air inlet pipe 6 and the inner surface of the tapered pipe section 11, so as to provide support for the gas inlet casing 29, and meanwhile, the gas is injected into the throat section/diverging section at a certain angle and at a high speed along the swirl vanes, and is primarily mixed with the ventilation air in the diverging section.
As shown in fig. 4 and 5, the gas inlet housing 29 includes a gas inlet pipe section 12, the gas inlet pipe section 12 is disposed at the maximum diameter end of the tapered pipe section 11, the gas inlet pipe section 12 is connected with two gas inlet pipes 5, and a gas inlet main pipe branches into two gas inlet pipes 5 to introduce gas.
As shown in fig. 2,3, 6 and 7, the static mixers include a first static mixer 7 and a second static mixer 8, the second static mixer 8 is used for rotating the high-speed fluid of the upstream cylinder along the axial direction of the cylinder 1 while flowing toward the periphery of the cylinder 1, and the second static mixer 8 is located between the first static mixer 7 and the third static mixer 9.
As shown in fig. 2, 3, 6 and 7, the first static mixer 7 includes 6T-shaped structures 17 with central symmetry, each T-shaped structure 17 includes a fin plate 15, and the expansion plane of the fin plate 15 is trapezoid-like.
The fin plate 15 has a fixed end and a free end along a length direction, the fixed end is mounted on the inner wall of the cylinder 1, the fin plate 15 has an increased width from the free end to the fixed end, the free end is disposed closer to the air inlet end 2 than the fixed end, and the free end is disposed closer to the central axis of the cylinder 1 than the fixed end.
As shown in fig. 7, a first cavity is formed between the free ends of the 6T-shaped structures 17.
As shown in fig. 13 and 14, after passing through the two side edges of each fin plate 15, the fluid forms 2 vortex centers with opposite directions respectively, the rotation axis of the vortex centers is parallel to the axis of the cylinder, and has 12 vortex centers in total, as shown in fig. 14, in a velocity vector diagram of the section of the cylinder downstream of the fin plates, two vortices are generated downstream of each fin plate, and 6 fin plates form 12 vortices with opposite directions in total and are distributed near the edges of the cylinder wall, as shown by blue arrows in fig. 14. These vortices are created as the gas flow passes over the edges of the fin plates and gradually amplify as the gas moves downstream, while the gas flow in the center of the barrel remains upstream of the swirling characteristics of the gas as it is unaffected by the fin plates. Thus, the mixer pressure loss is significantly reduced without reducing the blending effect. The center of each vortex increases with the width of the fin plate 15, the edge vortices increase and as the fluid continues to move rearward, the vortices are progressively amplified and as the fluid continues to move rearward.
As shown in fig. 6 and 7, the T-shaped structure 17 includes a vertical support plate 16, and one side of the vertical support plate 16 is vertically connected to the fin plate 15 along the length direction of the fin plate 15.
The fin plate 15 is an arc-shaped plate, and the free end deflects toward a direction away from the central axis of the cylinder.
As shown in fig. 2,3, 10 and 11, the second static mixer 8 includes 6 supporting frames 19, each supporting frame 19 is provided with a partition 20, the radial direction of the barrel 1 is divided into 6 parts by the 6 partitions, each partition 20 extends from the supporting frame 19 towards the inner wall of the barrel 1, the supporting frame 19 extends from the inner wall of the barrel 1 to the center of the barrel 1 along the radial direction of the barrel 1, the 6 supporting frames 19 meet at the center of the barrel 1, each partition 20 is arranged along the direction perpendicular to the central axis of the barrel 1, and each partition 20 is inclined towards the air outlet end 3, so that the partition becomes a guide vane.
By means of said second static mixer 8, the function of a partition is retained to a certain extent, i.e. the high-speed fluid in the central region of the upstream cylinder is blocked, and the high-speed fluid in the central region of the upstream cylinder is forced to change direction, and moves towards the periphery of the cylinder 1 while rotating along the axial direction of the cylinder, and is mixed with the high-concentration fluid close to the inner wall of the cylinder again at the downstream.
As shown in fig. 2, 3, 8 and 9, the static mixers include a third static mixer 9, the third static mixer 9 is located between the second static mixer 8 and the air inlet end 2, the third static mixer 9 includes 6 annular partitions 18, the 6 annular partitions 18 divide the cylinder into 6 parts in radial direction, each annular partition 18 is disposed along a direction perpendicular to the central axis of the cylinder 1, one side of each annular partition 18 is fixed on the inner wall of the cylinder 1, each annular partition 18 is inclined relative to the radial direction of the cylinder 1, so that the partition becomes a "guide vane", and a second cavity 21 is formed between the ends of the 6 annular partitions in the central area of the cylinder.
Through said third static mixer 9, the fluid in the central area of the cylinder forms a jet flow from said second cavity 21 to flow downstream, the fluid in the area around the cylinder 1 is changed in direction by the annular partition, and a peripheral annular flow is formed downstream of the annular partition, and the direction of the velocity vector is nearly vertical to the concentric flow.
As shown in fig. 2, 3 and 12, the plurality of static mixers includes a fourth static mixer 10, the fourth static mixer 10 is located between the first static mixer 7 and the air outlet end 3, the fourth static mixer 10 is a grid-type mixer, and is a mesh structure formed by grid plates perpendicular to each other, and the fourth static mixer 10 is used for unifying flow directions so that a flow field tends to be stable, and is convenient for stable operation of a downstream pipeline and equipment, and meanwhile, is convenient for measurement of various parameters of gas on the downstream pipeline, so that misalignment of measurement data caused by complicated flow fields in the pipeline and inconsistent flow directions is avoided.
As shown in fig. 2, the blending device includes a control unit 25, a gas control valve 27 disposed at the gas inlet housing 29, a ventilation air control valve 26 disposed at the ventilation air inlet pipe, and a blending fan 28, wherein the control unit 25 is respectively connected with the gas control valve 27, the ventilation air control valve 26, and the blending fan 28, and the control unit is configured to control the gas control valve 27 and the ventilation air control valve 26 according to the gas concentration of the blending gas at the blending fan, so as to adjust the flow and pressure of the gas inlet gas and the ventilation air gas, so that the concentration of the mixed gas is kept within a set range. The gas concentration of the blending gas may be obtained by providing the gas concentration detector 24. The mixing fan 28 adopts a variable frequency fan, and the frequency converter is connected with the pressure detector 23 arranged on the mixing gas pipeline and is used for controlling the frequency of the mixing fan according to the gas static pressure detected by the pressure detector, so as to control the air quantity of the mixed gas to be kept within a set range.
The specific operation steps of the efficient gas blending device are as follows:
(1) After the gas extracted by the high negative pressure extraction system and the low negative pressure extraction system are combined, the gas is sent into the cylinder body through a gas inlet conduit, the flow and the pressure of the gas are detected and regulated by a control system, the concentration of the gas entering the mixing device is between 5% vol and 15% vol, the flow is between 3370 and 10530Nm 3/h, and the gas static pressure at the upstream of a gas control valve is more than or equal to 3500Pa;
(2) The ventilation air is sent into a blending device through a ventilation air inlet pipe, a ventilation air control valve is controlled by a control system, so that the flow and pressure of ventilation air gas are matched with those of gas, then the blended gas is sent out of the blending device from the other end of the blending device, the concentration of ventilation air gas entering the blending device is about 0.3% vol, the flow is between 89000 and 103300Nm 3/h, and the static pressure at the upstream of the ventilation air control valve is about-550 Pa;
(3) In the cylinder, the gas and the mixed gas pass through a third static mixer, so that the gas in the central area of the cylinder and the mixed gas in the peripheral area of the cylinder are subjected to flow direction change and exchange, the turbulence and the mixing degree of the gas are increased, and the methane volume concentration of the mixed gas is within 5%;
(4) In the cylinder, the gas passing through the third static mixer passes through the second static mixer, so that the gas in the central area of the cylinder moves towards the periphery of the cylinder and simultaneously rotates and flows along the axial direction of the cylinder to be mixed with the gas close to the inner wall of the cylinder again, the rotation degree and the mixing degree of the gas are increased, and the methane volume concentration of the mixed gas is within 2%;
(5) In the cylinder, the gas passing through the second static mixer passes through the first static mixer, so that the gas forms a plurality of vortex flows with opposite rotation directions (figures 13 and 14), the vortex flow degree and the mixing degree of the gas are increased, and meanwhile, the first static mixer has the advantage of small pressure loss, so that the methane volume concentration of the mixed gas is within 1.3 percent, and the pressure loss is within 100 Pa;
(6) In the cylinder, the gas passing through the first static mixer passes through the rectification grating of the fourth static mixer, so that the flow field of the gas tends to be stable and flow direction is unified, the stable operation of downstream pipelines and equipment is facilitated, the measurement of various parameters of the gas is facilitated, the methane concentration of the mixed gas is about 1.2% vol, the air quantity is about 110000Nm 3/h, and the outlet static pressure is between-1500 Pa and-1300 Pa;
(7) And the mixed gas is discharged from the lower end of the cylinder, the concentration of the mixed gas is detected and regulated by the control system, and the air quantity is detected and regulated by the pressure detector and the mixing fan, so that the mixed gas is in a safe, stable and uniform state, and is conveniently led into RTO for combustion treatment, and the emission reduction and heat energy recovery of gas are realized.
The high-efficiency gas blending device is used for mixing the gas extracted by the high negative pressure and low negative pressure extraction system with the ventilation air methane gas, so that the mixed gas reaches safe, stable and uniform concentration, and is conveniently led into RTO for combustion treatment, thereby improving the treatment efficiency and effect of the gas and reducing the emission reduction cost and the environmental influence of the gas.
Therefore, the high-efficiency gas mixing device can mix the combustible gas with the concentration higher than or close to the lower explosion limit of the combustible material with the diluent gas, so that the mixed combustible gas reaches the safe concentration (the concentration is less than or equal to 25% of the lower explosion limit of the combustible material), and meanwhile, the concentration of the mixed gas at the outlet of the mixing device is stable and uniform. The method is particularly suitable for mixing the gas and the ventilation air methane gas, and can also be applied to the mixing working conditions of other high-concentration VOCs (volatile organic compounds at normal temperature, with the boiling point of 50-260 ℃ generally) and diluent gas (air or low-concentration VOCs). The overall size of the blending device can be adjusted according to the air quantity of the imported high-concentration VOCs gas and the diluted gas and the total air quantity of the mixed gas, but the arrangement form, sequence and structure of each stage of static mixer are verified by calculation simulation and experiment, and the adjustment is not performed.
The gas blending box and the blending method thereof provided by the invention are used for mixing the gas extracted by the high negative pressure and low negative pressure extraction system with the ventilation air methane gas, so that the mixed gas reaches safe, stable and uniform concentration, and is conveniently led into RTO for combustion treatment.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (5)
1. The utility model provides a high-efficient gas mixing device, its characterized in that includes the barrel, the one end of barrel be the air inlet end, the other end of barrel be the air outlet end, the air inlet end set up the joint air inlet ware, the joint air inlet ware include gas air inlet shell, ventilation air intake pipe, divergent pipe, the maximum diameter end of divergent pipe set up on the air inlet end, gas air inlet shell include the convergent pipe section, the minimum diameter end of convergent pipe section be connected with the minimum diameter end of divergent pipe, ventilation air intake pipe sleeve set up in the gas air inlet shell, the mouth of pipe of ventilation air intake pipe with the convergent pipe between form the jet orifice, make the gas through the convergent pipe section through the jet orifice get into divergent pipe with the ventilation air that the ventilation air intake pipe got into from the ventilation air intake pipe mixes, the inside of the cylinder body is provided with a plurality of static mixers from the air inlet end to the air outlet end, the static mixers are distributed at intervals along the axial direction of the cylinder body, a plurality of rotational flow guide vanes are arranged in the tapered pipe section at intervals, the rotational flow guide vanes are arranged between the outer surface of the ventilation air inlet pipe and the inner surface of the tapered pipe section, the gas air inlet shell comprises a gas air inlet pipe section, the gas air inlet pipe section is arranged at the maximum diameter end of the tapered pipe section, the gas air inlet pipe section is connected with at least one gas air inlet conduit, the static mixers comprise a first static mixer and a second static mixer, the first static mixer comprises a plurality of T-shaped structures, each T-shaped structure comprises a fin plate, the fin plate is provided with a fixed end and a free end along the length direction, the fixed end is arranged on the inner wall of the cylinder, the fin plates have increasing widths from the free end to the fixed end, the free end is arranged closer to the air inlet end relative to the fixed end, the free end is arranged closer to the central axis of the cylinder relative to the fixed end, a first cavity is formed among the free ends of the T-shaped structures, 2 vortex centers which are opposite in rotation direction are formed through each T-shaped structure, each vortex center is formed by fluid passing through the edge of the fin plate, the edge vortex is increased along with the increase of the width of the fin plates, the second static mixer is used for rotating and flowing high-speed fluid of the upstream cylinder along the axial direction of the cylinder while flowing towards the periphery of the cylinder, and the second static mixer is positioned between the first static mixer and the air inlet end;
The plurality of static mixers comprise a third static mixer, the third static mixer is positioned between the second static mixer and the air inlet end, the third static mixer comprises a plurality of annular clapboards, each annular clapboard is arranged along the direction perpendicular to the central axis of the cylinder, one side of each annular clapboard is fixed on the inner wall of the cylinder, each annular clapboard is inclined relative to the radial direction of the cylinder, a second cavity is formed between the tail ends of the plurality of annular clapboards, fluid in the central area of the cylinder flows downwards from the second cavity through the third static mixer, the fluid in the area around the cylinder is changed by the clapboards, and peripheral annular flow is formed at the downstream of the clapboards;
The plurality of static mixers comprise a fourth static mixer, the fourth static mixer is positioned between the first static mixer and the air outlet end, the fourth static mixer is a grid type mixer, and the fourth static mixer is used for unifying the flow direction so that the flow field tends to be stable.
2. The apparatus of claim 1, wherein the T-shaped structure comprises a vertical support plate, and wherein one side of the vertical support plate is vertically connected to the fin plate along a length direction of the fin plate.
3. The apparatus of claim 1, wherein the fin plate is an arcuate plate and the free end deflects away from the central axis of the barrel; the expansion plane of the fin plate is trapezoid-like, and the first static mixer comprises 6T-shaped structures which are symmetrical in center.
4. The apparatus of claim 1, wherein said second static mixer comprises a plurality of support frames, each of said support frames being provided with a baffle, each of said baffles extending from said support frame toward the inner wall of said barrel, said support frames extending radially of said barrel from the inner wall of said barrel to the center of said barrel, each of said baffles being provided in a direction perpendicular to the central axis of said barrel, each of said baffles being inclined toward said air outlet end, and said high velocity fluid in the central region of the upstream barrel being forced to move rotationally in the axial direction of the barrel while changing its direction toward the periphery of the barrel by said second static mixer.
5. The efficient gas blending device according to claim 1, wherein the device comprises a control unit, a gas control valve arranged at the gas inlet shell, a ventilation air control valve arranged at the ventilation air inlet pipe and a blending fan, the control unit is respectively connected with the gas control valve, the ventilation air control valve and the blending fan, and the control unit is arranged to control the gas control valve and the ventilation air control valve according to the gas concentration of blending gas at the blending fan so as to adjust the flow and the pressure of gas inlet gas and ventilation air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410315921.0A CN117899687B (en) | 2024-03-20 | 2024-03-20 | Gao Xiaowa S mixing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410315921.0A CN117899687B (en) | 2024-03-20 | 2024-03-20 | Gao Xiaowa S mixing device |
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| CN117899687B true CN117899687B (en) | 2024-05-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208934734U (en) * | 2018-08-28 | 2019-06-04 | 长治市亿扬能源科技有限公司 | A kind of idle air and low concentration gas blend system |
| CN111054229A (en) * | 2019-01-28 | 2020-04-24 | 河北寰球工程有限公司 | Ventilation air methane and low-concentration gas static mixer with suction function |
| CN214261418U (en) * | 2021-01-14 | 2021-09-24 | 河南平煤神马节能科技有限公司 | Automatic mixing type mixing system for low-concentration methane of coal mine ventilation air methane |
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2024
- 2024-03-20 CN CN202410315921.0A patent/CN117899687B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208934734U (en) * | 2018-08-28 | 2019-06-04 | 长治市亿扬能源科技有限公司 | A kind of idle air and low concentration gas blend system |
| CN111054229A (en) * | 2019-01-28 | 2020-04-24 | 河北寰球工程有限公司 | Ventilation air methane and low-concentration gas static mixer with suction function |
| CN214261418U (en) * | 2021-01-14 | 2021-09-24 | 河南平煤神马节能科技有限公司 | Automatic mixing type mixing system for low-concentration methane of coal mine ventilation air methane |
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| CN117899687A (en) | 2024-04-19 |
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