CN111692018A - Low-concentration gas power generation mixing device - Google Patents
Low-concentration gas power generation mixing device Download PDFInfo
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- CN111692018A CN111692018A CN202010693868.XA CN202010693868A CN111692018A CN 111692018 A CN111692018 A CN 111692018A CN 202010693868 A CN202010693868 A CN 202010693868A CN 111692018 A CN111692018 A CN 111692018A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention relates to a low-concentration gas power generation mixing device, which belongs to the technical field of gas mixing and comprises a primary mixed flow cavity, a secondary mixed flow cavity and a flow dividing cavity, wherein the primary mixed flow cavity, the secondary mixed flow cavity and the flow dividing cavity are sequentially arranged in the flowing direction of gas; a first air inlet and a second air inlet are respectively arranged at two ends of the primary mixed flow cavity; the inlet of the secondary mixed flow cavity is positioned between the first air inlet and the second air inlet, a plurality of layers of conical mixed pieces are arranged in the secondary mixed flow cavity at intervals along the axial direction of the secondary mixed flow cavity, the conical mixed pieces are arranged in the middle of the secondary mixed flow cavity, and the large end of the conical mixed pieces faces the flowing direction of gas; the two ends of the flow dividing cavity are respectively provided with a first air outlet and a second air outlet, and the outlet of the secondary mixed flow cavity is positioned between the first air outlet and the second air outlet. The invention does not change the flow direction of the gas extraction pipeline, occupies small area, is easy to install and has small pressure loss of the mixing device.
Description
Technical Field
The invention belongs to the technical field of gas mixing, and relates to a low-concentration gas power generation mixing device.
Background
Gas generator sets generally require that the concentration of gas entering the generator be greater than 10%. Once the gas concentration is lower than 10 percent, the gas generator set is unstable in operation and easy to shut down.
Two sets of drainage systems, namely a high negative pressure extraction system and a low negative pressure extraction system, are built in most coal mine gas drainage pump stations in China. The gas extracted by the high negative pressure extraction system has high concentration. The gas extracted by the low-negative-pressure extraction system is low in concentration, and the low-negative-pressure gas concentration is sometimes lower than 10%, so that normal power generation cannot be realized. In order to maximize the power generation benefit of gas extraction, a high-concentration gas mixing device and a low-concentration gas mixing device are designed, gas extracted by a high negative pressure pipeline and gas extracted by a low negative pressure pipeline are mixed, and then the mixed gas with the concentration of more than 10% is sent to a generator set for power generation.
Most of domestic coal mine gas mixing devices are used for mixing ventilation air methane and drainage gas, the concentration of the mixed gas is about 12%, and the mixed gas is used for heat storage oxidation utilization projects.
The coal mine gas mixing device mostly adopts spiral mixed flow, spiral blades are welded on the inner wall of a gas extraction and extraction inlet pipeline section of the mixing device, so that extracted gas enters a gas mixing cavity in a rotating mode, and spiral sheets with opposite rotating directions are also arranged in the gas mixing cavity, so that ventilation air methane and extracted gas are reversely mixed in the gas mixing cavity, and the purpose of uniform mixing is achieved. The device has designed two-stage helical blade, and general gas drainage air inlet pipeline pipe diameter is DN500, installs helical blade in the pipe diameter, makes pipeline circulation cross-section reduce, and the resistance increases, mixes the intracavity cross-section and also reduces because of having installed helical blade circulation cross-section to cause mixing device pressure loss to be about 500 ~ 1000 Pa.
In addition, the mixing device is internally provided with a helical blade, and the helical blade is complex to process and needs to be processed and manufactured in a special workshop.
Disclosure of Invention
In view of this, an object of the present application is to provide a blending device for low-concentration gas power generation, so as to solve the problem of large pressure loss of the blending device.
In order to achieve the purpose, the invention provides the following technical scheme:
a low-concentration gas power generation mixing device comprises a primary mixing cavity, a secondary mixing cavity and a flow dividing cavity which are sequentially arranged along the flowing direction of gas; a first air inlet and a second air inlet are respectively arranged at two ends of the primary mixed flow cavity; the inlet of the secondary mixed flow cavity is positioned between the first air inlet and the second air inlet, a plurality of layers of conical mixed pieces are arranged in the secondary mixed flow cavity at intervals along the axial direction of the secondary mixed flow cavity, the conical mixed pieces are arranged in the middle of the secondary mixed flow cavity, and the large end of the conical mixed pieces faces the flowing direction of gas.
Optionally, the primary mixing cavity and the diversion cavity are arranged perpendicular to the secondary mixing cavity; the two ends of the flow dividing cavity are respectively provided with a first air outlet and a second air outlet, and the outlet of the secondary mixed flow cavity is positioned between the first air outlet and the second air outlet.
Optionally, the primary mixing cavity is cylindrical, and the first air inlet and the second air inlet are arranged along the radial direction of the primary mixing cavity.
Optionally, the inner diameter of the primary mixing cavity
Wherein the content of the first and second substances,
d1: the inner diameter of the first air inlet is,
d2: the inner diameter of the second air inlet is smaller than the inner diameter of the second air inlet,
k: section modulus.
Optionally, a flow blocking sheet is arranged between the adjacent conical mixing parts, and the flow blocking sheet is arranged along the circumferential direction of the secondary mixing cavity and forms an angle α with the axial direction of the secondary mixing cavity.
Optionally, α is 45 °.
Optionally, the primary mixing cavity and the secondary mixing cavity are cylindrical, the inner diameter of the secondary mixing cavity is the same as that of the primary mixing cavity, and the length of the secondary mixing cavity is n times of that of the primary mixing cavity.
Optionally, n-4.
Optionally, the diameter of the bottom surface of the conical mixing member
Wherein the content of the first and second substances,
d: the inner diameter of the primary mixed flow cavity,
d1: the inner diameter of the first air inlet is,
d2: a second inlet inner diameter.
Optionally, more than 3 layers of conical mixing pieces are arranged in the secondary mixing cavity.
Optionally, each layer of flow blocking piece comprises a plurality of flow blocking pieces uniformly distributed in the circumferential direction of the secondary mixed flow cavity, and the flow blocking pieces of adjacent layers are arranged in a staggered mode.
Optionally, the flow blocking pieces comprise four flow blocking pieces uniformly distributed in the circumferential direction of the secondary mixed flow cavity, and the length of each flow blocking piece
Width of each flow-blocking sheet
Wherein the content of the first and second substances,
d: the inner diameter of the primary mixed flow cavity,
d3: the diameter of the bottom surface of the conical mixing element.
The invention has the beneficial effects that:
1. the invention realizes the opposite-flushing mixing of gas in the primary mixed flow cavity; the multilayer conical mixing piece is arranged in the secondary mixed flow cavity, so that gas is subjected to reversing collision for multiple times, and the diffusion speed of the gas with two concentrations is increased; the mixing device improves the mixing uniformity of gas, and has simple structure and small resistance.
2. According to the invention, the flow blocking pieces are arranged between the adjacent conical mixing pieces, the gas passing through the first layer of conical mixing pieces is partially divided by arranging the plurality of layers of conical mixing pieces and the plurality of layers of flow blocking pieces, part of the gas is changed in flow direction and is emitted to the second layer of conical mixing pieces, and part of the gas is mixed with the gas reversed by the second layer of conical mixing pieces again in the process of flowing to the second layer of flow blocking pieces, and is accelerated to flow to the second layer of flow blocking pieces to change the flow direction, so that the mixing uniformity of the gas is further improved.
3. According to the invention, the flow blocking pieces are designed into a split structure, and the flow blocking pieces of adjacent layers are arranged in a staggered manner, so that the gas separation effect is achieved; on the other hand, the turbulent flow effect is enhanced due to the effect of the flow blocking sheet, the flow resistance is reduced, the pressure loss of the mixing device is reduced, and the power consumption of the gas drainage pump is reduced.
The invention has small floor area, easy installation, simple mixing structure, small resistance and uniform mixing, can process and manufacture the mixing structure on the engineering site, and solves the problems of large pressure loss and complex structure of the mixing device in the prior art.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of a gas power generation blending device;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
fig. 4 is a cross-sectional view taken along line C-C of fig. 1.
Reference numerals: the device comprises a first air inlet 1, a primary mixing cavity 2, a second air inlet 3, a conical mixing part 4, a flow blocking sheet 5, a secondary mixing cavity 6, a first air outlet 7, a flow dividing cavity 8 and a second air outlet 9.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 4, a low-concentration gas power generation mixing device includes a primary mixing cavity 2, a secondary mixing cavity 6 and a flow dividing cavity 8 sequentially arranged along a gas flowing direction; a first air inlet 1 and a second air inlet 3 are respectively arranged at two ends of the primary mixed flow cavity 2; the entry of second grade muddy class chamber 6 is located between first air inlet 1 and second air inlet 3, is equipped with a plurality of layers of toper thoughtlessly expecting piece 4 along its axial interval in second grade muddy class chamber 6, and toper thoughtlessly expecting piece 4 sets up in the middle part of second grade muddy class chamber 6, and its main aspects is towards the flow direction of gas.
According to the invention, the inlet of the secondary mixing cavity 6 is arranged between the first air inlet 1 and the second air inlet 3 of the primary mixing cavity 2, so that the gas is mixed in the first mixing cavity in a counter-flow manner; through setting up toper thoughtlessly expecting 4 in second grade thoughtlessly flows chamber 6 for the gas directive of 2 outflow in one-level thoughtlessly flows the conical surface of expecting 4 in the toper, and the conical surface makes gas be radial flow direction chamber wall, and gas meets chamber wall and changes the flow direction once more, through the collision each other who commutates many times, has improved the gas diffusion velocity of two kinds of concentrations, makes the mixing more even.
Preferably, the primary mixing cavity 2 and the diversion cavity 8 are arranged perpendicular to the secondary mixing cavity 6.
According to the invention, the first air outlet 7 and the second air outlet 9 are respectively arranged at the two ends of the flow dividing cavity 8, and the outlet of the secondary flow mixing cavity 6 is arranged between the first air outlet 7 and the second air outlet 9.
According to the invention, the outlet of the secondary mixing cavity 6 is arranged between the first air outlet 7 and the second air outlet 9 of the flow dividing cavity 8, so that the gas is mixed again in the flow dividing cavity 8.
For the convenience of processing, one-level muddy flow chamber 2, second grade muddy flow chamber 6 adopt the structure of drum type, and first air inlet 1 and second air inlet 3 radially set up along one-level muddy flow chamber 2, and the internal diameter of second grade muddy flow chamber 6 is unanimous with the internal diameter of one-level muddy flow chamber 2, and the length of second grade muddy flow chamber 6 is n times its internal diameter, and preferred n is 4.
Inner diameter of the primary mixing cavity
Wherein the content of the first and second substances,
d1: the inner diameter of the first air inlet is,
d2: the inner diameter of the second air inlet is smaller than the inner diameter of the second air inlet,
k: section modulus.
Preferably, the diameter of the bottom surface of the conical mixing element
Wherein the content of the first and second substances,
d: the inner diameter of the primary mixed flow cavity,
d1: the inner diameter of the first air inlet is,
d2: a second inlet inner diameter.
In order to improve the mixing uniformity, a layer of flow blocking sheet 5 is arranged between adjacent conical mixing pieces 4, the flow blocking sheet 5 is arranged along the circumferential direction of the secondary mixing cavity and forms an alpha angle with the axial direction of the secondary mixing cavity, and one end, far away from the inner wall of the secondary mixing cavity, of the flow blocking sheet 5 faces the gas flow direction, namely the flow blocking sheet 5 is arranged obliquely downwards.
Preferably α is 45 °.
The flow baffle 5 can be an integral ring or a plurality of sheet structures arranged along the circumferential direction of the secondary mixed flow cavity at intervals.
Preferably, the second-stage mixing cavity 6 is internally provided with 3 layers of conical mixing parts 4, each layer of flow blocking piece comprises a plurality of flow blocking pieces uniformly distributed in the circumferential direction of the second-stage mixing cavity, and the flow blocking pieces of adjacent layers are arranged in a staggered manner.
Preferably, each layer of flow blocking sheet comprises four flow blocking sheets uniformly distributed in the circumferential direction of the secondary mixing cavity 6, and the length of each flow blocking sheet
Width of each flow-blocking sheet
Wherein the content of the first and second substances,
d: the inner diameter of the primary mixed flow cavity,
d3: the diameter of the bottom surface of the conical mixing element.
Examples
A low-concentration gas power generation mixing device comprises a primary mixing cavity 2, a secondary mixing cavity 6 and a flow dividing cavity 8. The second-stage mixed flow cavity 6 is vertically arranged with the first-stage mixed flow cavity 2 and the flow dividing cavity 8, namely, the first-stage mixed flow cavity 2, the second-stage mixed flow cavity 6 and the flow dividing cavity 8 are arranged in an I-shaped structure. The two ends of the primary mixed flow cavity 2 are respectively provided with a first air inlet 1 and a second air inlet 3 which are positioned at the same side of the primary mixed flow cavity 2; the inlet of the secondary mixing cavity 6 is positioned at the other side of the primary mixing cavity 2 and is positioned between the first air inlet 1 and the second air inlet 3; the two ends of the diversion cavity 8 are respectively provided with a first air outlet 7 and a second air outlet 9 which are positioned at the same side of the diversion cavity 8; the outlet of the secondary mixed flow cavity 6 is positioned at the other side of the branch flow cavity 8 and is positioned between the first air outlet 7 and the second air outlet 9. The primary mixing cavity 2 enables two paths of gas to be flushed oppositely to realize primary mixing; 3 layers of conical mixing parts 4 are arranged in the secondary mixing cavity 6 along the gas flow direction, namely a first layer of conical mixing parts, a second layer of conical mixing parts and a third layer of conical mixing parts are sequentially arranged along the gas flow direction, and the conical mixing parts 4 are fixedly connected with the secondary mixing cavity 6; the large end sides of the first layer of conical mixing part and the second layer of conical mixing part are respectively provided with a first layer of flow blocking sheet and a second layer of flow blocking sheet; the gas is continuously reversed, changed in speed, separated and mixed in the secondary mixing cavity 6, and strong turbulence phenomenon occurs, so that the gas is mixed, and the aim of uniform mixing is fulfilled; two gas outlets are designed on the diversion cavity 8 and connected with a gas conveying pipeline, so that the mixed gas is divided into two paths of gas to flow to the generator set.
This embodiment design has two air inlets for connect two way gas of different concentrations. The two paths of gas are respectively a high negative pressure extraction pipeline and a low negative pressure extraction pipeline from a gas drainage pump station.
Two paths of gas enter the primary mixing cavity 2 from the gas inlet, the flow directions of the gas are changed in the cavity, and the gas flow directions mutually form 180 degrees, so that the opposite impact is formed, and the mixed flow effect is achieved. The mixed flow cavity adopts a round steel pipe, and the cross-sectional dimension of the steel pipe is as follows:
in the formula: d: inner diameter of first-stage mixed flow cavity
d1: the inner diameter of the first air inlet is,
d2: the inner diameter of the second air inlet is smaller than the inner diameter of the second air inlet,
k: the section modulus is generally 1.2 to 1.5.
Three layers of conical mixing parts 4 are sequentially arranged at the center of the secondary mixed flow cavity. The gas flowing out of the primary mixed flow cavity 2 is emitted to the surface of the cone, the surface of the cone enables the gas to flow to the cavity wall in a radial shape around the surface of the cone, the flow direction of the gas is changed again when the gas meets the cavity wall, and the gas with two concentrations is diffused by mutual collision through multiple reversing. The cone structure enables the flow section of the cylinder body to be continuously reduced, the gas flow velocity and the kinetic energy are gradually increased, the gas turbulence phenomenon is enhanced through speed change, and the purpose of uniform mixing is achieved.
The second-stage mixed flow cavity 6 is made of a round steel pipe, the pipe diameter of the second-stage mixed flow cavity is consistent with that of the first-stage mixed flow cavity 2, and the length of the second-stage mixed flow cavity is 4 times of the pipe diameter.
The conical angle of the conical shell is 90 degrees, and the inner diameter of the bottom surface of the conical shell is as follows:
in the formula: d: the inner diameter of the primary mixed flow cavity,
d1: the inner diameter of the first air inlet is,
d2: the inner diameter of the second air inlet is smaller than the inner diameter of the second air inlet,
d3: the diameter of the bottom surface of the conical mixing element.
Four flow blocking pieces are uniformly distributed on the circumference of the wall of the cavity at the position d/4 away from the large end sides of the first layer conical mixing piece and the second layer conical mixing piece, the front flow blocking piece and the rear flow blocking piece are staggered by 45 degrees, and each flow blocking piece and the length direction of the second-stage mixing cavity form an angle of 45 degrees and are fixed on the inner wall of the second-stage mixing cavity 6. The size of the flow blocking sheet is as follows:
length:
in the formula: l: the length of the flow blocking sheet is long,
d: the inner diameter of the primary mixed flow cavity,
width:
in the formula: w: the width of the flow baffle sheet is larger than the width of the flow baffle sheet,
d: the inner diameter of the primary mixed flow cavity,
d3: the diameter of the bottom surface of the conical mixing element.
The first layer of flow blocking sheet enables about half of gas flowing out of the first layer of conical mixing piece to be divided, the flow direction is changed to be emitted to the second layer of conical mixing piece, and the mixing effect of the upper layer of conical mixing piece is repeated; and the other half of the gas flows to the second layer of flow blocking piece, and is mixed with the gas reversed by the second layer of conical mixing piece in the process of flowing to the second layer of flow blocking piece again, and the gas is accelerated to flow to the second layer of flow blocking piece to change the flow direction and is jetted to the third layer of conical mixing piece to mix. And the gas enters the shunting cavity 8 after passing through the third layer of mixed flow piece.
Four flow blocking sheets are arranged on each layer, and the upper layer and the lower layer are arranged in a staggered manner at an angle of 45 degrees, so that gas is separated and a mixing effect is achieved; on the other hand, the turbulent flow effect is enhanced due to the action of the flow blocking sheet, and meanwhile, compared with the annular flow blocking sheet, the flow resistance is reduced, so that the pressure loss of the mixing device is small, and the power consumption of the gas drainage pump is reduced.
Two gas outlets are designed on the diversion cavity 8 and connected with a gas conveying pipeline, so that the mixed gas is divided into two paths of gas to flow to the generator set.
The mixing device combines the characteristics of the existing coal mine pump station in China, and two paths of gas extraction inlets are designed and are respectively connected with a low negative pressure extraction system pipeline and a high negative pressure extraction system pipeline of the pump station. The two paths of extracted gas flow into the primary mixed flow cavity 2, and the convection effect is formed by utilizing the conveying kinetic energy to achieve the mixed flow effect. The gas after the first-stage mixed flow enters a second-stage mixed flow cavity 6, and three layers of conical mixed flow components are sequentially arranged in the center of the second-stage mixed flow cavity 6; four flow blocking sheets are uniformly distributed on the circumference of the cavity wall behind the front two layers of conical components, and the four flow blocking sheets on the two layers are staggered by 45 degrees around the pipeline wall, so that the effect of enhancing the mixing uniformity is achieved. The rear end of the mixing device is provided with a shunting cavity 8, mixed gas is distributed into two paths, and then the two paths of mixed gas are respectively conveyed to a gas generator set.
The existing spiral mixing device is provided with a ventilation air methane gas inlet pipeline and a low-concentration gas inlet pipeline, continuous spiral blades are arranged on the wall of the gas inlet pipeline, gas is mixed after rotating in the mixing device body due to the action of the spiral blades, continuous spiral blades are also arranged at the rear end of the mixing device body, and the spiral blades enable the mixed gas to rotate again, so that the aim of uniformly mixing is finally fulfilled.
The mixing device does not change the flow direction of the gas extraction pipeline, occupies small area, is easy to install, has simple structure, can be processed and manufactured on the engineering site, and has small resistance and uniform mixing. The actual measurement resistance of this blending device is less than 500pa, and the blending degree of consistency is greater than 95%, and the volume is about 1/2 of spiral blending device. The mixing blades of the spiral mixing device need to be processed and manufactured by a special processing factory, the spiral blades are in a surrounding type and are multiple in number, and the resistance of the device is relatively large.
The mixing device is suitable for mixing low-concentration gas with different concentrations in a gas power generation project, is used for a gas power station, realizes the full utilization of gas drainage, ensures the safe and continuous operation of a gas generator set, and improves the economic benefit of the power station by more than 15%.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a low concentration gas electricity generation mixing device which characterized in that: the gas mixing device comprises a primary mixing cavity, a secondary mixing cavity and a flow dividing cavity which are sequentially arranged along the flowing direction of gas; a first air inlet and a second air inlet are respectively arranged at two ends of the primary mixed flow cavity; the inlet of the secondary mixed flow cavity is positioned between the first air inlet and the second air inlet, a plurality of layers of conical mixed pieces are arranged in the secondary mixed flow cavity at intervals along the axial direction of the secondary mixed flow cavity, the conical mixed pieces are arranged in the middle of the secondary mixed flow cavity, and the large end of the conical mixed pieces faces the flowing direction of gas.
2. The blending device for low-concentration gas power generation according to claim 1, wherein: the primary mixed flow cavity and the flow dividing cavity are perpendicular to the secondary mixed flow cavity; the two ends of the flow dividing cavity are respectively provided with a first air outlet and a second air outlet, and the outlet of the secondary mixed flow cavity is positioned between the first air outlet and the second air outlet.
3. The blending device for low-concentration gas power generation according to claim 1, wherein: the first-stage flow mixing cavity is cylindrical, and the first air inlet and the second air inlet are arranged along the radial direction of the first-stage flow mixing cavity.
4. The blending device for low-concentration gas power generation according to claim 3, wherein: the inner diameter of the primary mixed flow cavity
Wherein the content of the first and second substances,
d1: the inner diameter of the first air inlet is,
d2: the inner diameter of the second air inlet is smaller than the inner diameter of the second air inlet,
k: section modulus.
5. The blending device for low-concentration gas power generation according to claim 1, wherein: and a flow blocking sheet is arranged between the adjacent conical mixing parts, is arranged along the circumferential direction of the secondary mixing cavity and forms an alpha angle with the axial direction of the secondary mixing cavity.
6. The blending device for low-concentration gas power generation according to claim 5, wherein: the primary mixing cavity and the secondary mixing cavity are cylindrical, the inner diameter of the secondary mixing cavity is consistent with that of the primary mixing cavity, and the length of the secondary mixing cavity is n times of that of the primary mixing cavity.
7. The blending device for low-concentration gas power generation according to claim 6, wherein: the diameter of the bottom surface of the conical mixing part
Wherein the content of the first and second substances,
d: the inner diameter of the primary mixed flow cavity,
d1: the inner diameter of the first air inlet is,
d2: a second inlet inner diameter.
8. The blending device for low-concentration gas power generation according to claim 5, wherein: and more than 3 layers of conical mixing parts are arranged in the secondary mixed flow cavity.
9. The blending device for low-concentration gas power generation according to claim 8, wherein: each layer of flow blocking piece comprises a plurality of flow blocking pieces which are uniformly distributed in the circumferential direction of the secondary mixed flow cavity, and the flow blocking pieces of adjacent layers are arranged in a staggered mode.
10. The blending device for low-concentration gas power generation according to claim 5, wherein: the flow blocking pieces comprise four flow blocking pieces uniformly distributed in the circumferential direction of the secondary mixed flow cavity, and the length of each flow blocking piece
Width of each flow-blocking sheet
Wherein the content of the first and second substances,
d: the inner diameter of the primary mixed flow cavity,
d3: the diameter of the bottom surface of the conical mixing element.
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