CN114719255A - Single-layer porous medium burner - Google Patents

Single-layer porous medium burner Download PDF

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Publication number
CN114719255A
CN114719255A CN202210267266.7A CN202210267266A CN114719255A CN 114719255 A CN114719255 A CN 114719255A CN 202210267266 A CN202210267266 A CN 202210267266A CN 114719255 A CN114719255 A CN 114719255A
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CN
China
Prior art keywords
chamber
porous medium
inlet pipe
premixing
premixing chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210267266.7A
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Chinese (zh)
Inventor
陈维鑫
钱惠国
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Shanghai Institute of Technology
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Shanghai Institute of Technology
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Filing date
Publication date
Application filed by Shanghai Institute of Technology filed Critical Shanghai Institute of Technology
Priority to CN202210267266.7A priority Critical patent/CN114719255A/en
Publication of CN114719255A publication Critical patent/CN114719255A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

The present application provides a single layer porous media burner comprising: the device comprises an air inlet pipe, a fuel gas inlet pipe, a premixing chamber and a precombustion chamber; the air inlet pipe is arranged at the upper part of the premixing chamber, the gas inlet pipe is arranged on the side wall of the premixing chamber, and gas introduced into the air inlet pipe and gas introduced into the gas inlet pipe are mixed in the premixing chamber; the premixing chamber is fixedly connected with the precombustion chamber, and mixed gas in the premixing chamber is introduced into the precombustion chamber.

Description

Single-layer porous medium burner
Technical Field
The invention relates to the field of combustors, in particular to a single-layer porous medium combustor.
Background
With the rapid development of Chinese economy, energy and environmental problems become more and more important for people to pay attention. China faces a series of problems of outstanding contradictions between energy supply and demand, increasingly serious environmental pollution, continuous ecological destruction and the like. Therefore, various low calorific value combustion gases have been developed for more efficient and clean combustion. The conventional combustion technology cannot meet the requirement of low pollutant emission, but the porous medium combustion technology integrates energy conservation, emission reduction and environmental protection.
The traditional single-layer porous medium burner is not beneficial to the flame to be fixed in the porous medium, and the combustion is incomplete and unstable. In addition, the phenomena of backfire and misfire of the combustor are explored in practice, the internal pressure of the porous medium is caused to be overlarge, the service life of the porous medium material is shortened, and even the structure of the combustor is damaged.
Therefore, it is urgently needed to develop a single-layer porous medium burner which solves the unstable phenomena of backfire and misfire of the burner, makes the temperature distribution of a burning area more uniform, makes the burning more complete, has higher burning efficiency and longer service life, and has lower pollutant emission.
Disclosure of Invention
Based on the problems, the invention designs the burner which solves the unstable problems of tempering and fire dropping of the burner, so that the temperature distribution of a combustion layer is more uniform, the combustion is more sufficient, the combustion efficiency is higher, the pollutant emission is lower, and the service life is longer.
The present application provides a single layer porous media burner comprising: the device comprises an air inlet pipe, a fuel gas inlet pipe, a premixing chamber and a precombustion chamber;
the air inlet pipe is arranged at the upper part of the premixing chamber, the gas inlet pipe is arranged on the side wall of the premixing chamber, and gas introduced into the air inlet pipe and gas introduced into the gas inlet pipe are mixed in the premixing chamber;
the premixing chamber is fixedly connected with the precombustion chamber, and mixed gas in the premixing chamber is introduced into the precombustion chamber.
In one possible implementation manner, the premixing chamber is of a cylindrical structure, and spiral fins are arranged in the premixing chamber and fixedly connected with the inner wall of the premixing chamber.
In one possible implementation manner, the pitch of the spiral type ribs arranged on the inner side wall of the premixing chamber is variable, and the pitch is gradually reduced along the airflow direction.
In one possible implementation, the prechamber comprises: the pre-combustion chamber comprises a pre-combustion chamber shell, a pre-combustion chamber cavity, a porous medium plate and a heat-resistant steel bracket;
the pre-combustion chamber shell is of a rectangular table structure, and a pre-combustion chamber cavity is arranged in the pre-combustion chamber shell;
the porous medium plate is a single layer and is fixed at the air outlet end of the pre-combustion chamber shell through a heat-resistant steel support, and holes in the porous medium plate are of a circular truncated cone structure with a gradually-expanded certain angle.
In one possible implementation manner, the air holes in the porous medium plate are arranged in a straight-through manner and gradually expand along the air flow direction;
the aperture of the air inlet hole is 2mm, the aperture of the air outlet hole is 3mm, and the porosity is more than 80%.
In one possible implementation mode, the porous medium plate is made of a silicon carbide ceramic material, the pre-combustion chamber shell is made of a high-temperature-resistant nickel-chromium alloy material, and the heat-resistant steel support is of a detachable structure.
In one possible implementation, the intake end of the pre-chamber housing is flanged to the pre-mixing chamber.
Due to the application of the technical scheme, compared with the prior art, the invention has the following beneficial effects: according to the single-layer porous medium burner provided by the invention, when gas and air enter the premixing chamber, the flow velocity of incoming gas is increased due to the spiral fins with variable screw pitches arranged in the premixing chamber, so that the gas and the air are more effectively mixed, the combustion is more sufficient, and the premixed gas in the cavity of the precombustion chamber is not easy to flow back to the premixing chamber. Meanwhile, the screw pitch of the spiral fins is gradually reduced along the air inlet direction, the screw pitch is the smallest when reaching the tail end of the premixing chamber, and the effect of buffering premixed gas is achieved to a certain extent while the flow speed is increased; the pre-combustion chamber shell is of a rectangular table structure, the cross section of the pre-combustion chamber shell is of an isosceles trapezoid gradually expanding downwards, and the buffer effect of slowing down the speed of premixed gas is achieved; the aluminum flange is used for connecting the premixing chamber and the pre-combustion chamber shell, and plays a role in heat dissipation to a certain extent, so that the inlet temperature of the cavity of the pre-combustion chamber is reduced, and tempering is prevented; the holes in the porous medium plate are of an outward gradually-expanding structure, the pollutant emission is lower due to the improvement of the temperature distribution by the gradually-expanding structure, the pressure in the holes is small, the flame is easy to be positioned on a combustion layer, and the tempering is not easy to occur; the single-layer porous medium plate is easy to disassemble and clean, and the service life is prolonged; the spiral fins with variable screw pitches and the gradually-expanding structure of the cross section of the shell of the precombustion chamber play a role in controlling the gas flow velocity, so that the burner is not easy to generate fire, a combustion layer forms turbulent combustion at a lower gas flow velocity, the temperature distribution is more uniform, and the combustion is more sufficient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a single layer porous media burner according to an exemplary embodiment of the present application;
FIG. 2 is a schematic illustration of a premix chamber configuration according to an exemplary embodiment of the present application;
FIG. 3 is a schematic front view of the structure of FIG. 2;
FIG. 4 is a schematic cross-sectional view of FIG. 2;
FIG. 5 is a schematic view of a single layer porous dielectric slab construction according to an exemplary embodiment of the present application;
FIG. 6 is a schematic cross-sectional view of FIG. 5;
FIG. 7 is a schematic top view (air intake direction) of the structure of FIG. 5;
fig. 8 is a top view (gas outlet direction) of fig. 5.
In the figure, 1-air inlet pipe, 2-gas inlet pipe, 3-premixing chamber, 4-spiral fins, 5-flange, 6-precombustion chamber shell, 7-precombustion chamber cavity, 8-porous medium plate and 9-heat-resistant steel bracket.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
For a better illustration of the invention, the following detailed description of the invention is given in conjunction with the accompanying drawings.
As shown in fig. 1, a single-layer porous medium burner comprises an air inlet pipe 1, a gas inlet pipe 2, a premixing chamber 3, spiral fins 4, a flange 5, a precombustion chamber shell 6, a precombustion chamber cavity 7, a porous medium plate 8 and a heat-resistant steel support 9, wherein the upper end of the premixing chamber 3 is provided with the air inlet pipe 1, and the side end of the premixing chamber is provided with the gas inlet pipe 2; the premixing chamber 3 is of a cylindrical structure, and spiral fins 4 are arranged at the end of the inner side wall of the chamber; the precombustion chamber shell 6 is of a rectangular platform structure, a precombustion chamber cavity is arranged in the shell, and the air inlet end of the shell is connected with the premixing chamber 3 through a flange 5; the porous medium plate 8 is a single layer and is fixed at the air outlet end of the prechamber shell 6 through a heat-resistant steel support 9, and holes in the porous medium plate 7 are of a cone structure with a gradually-expanded certain angle.
As shown in FIGS. 2-4, the premixing chamber 3 is of a cylindrical structure, the spiral fins 4 with variable screw pitches are arranged on the inner side wall of the chamber, the thickness of each fin is 3mm, and the screw pitches are variable and are reduced orderly along the air inlet direction. The spiral fins 4 increase the flow velocity of the incoming air, so that the gas and the air are more effectively mixed, the combustion is more sufficient, and the premixed gas in the cavity 7 of the precombustion chamber is difficult to flow back to the premixing chamber 3. Meanwhile, the screw pitch of the spiral type fins is gradually reduced along the air inlet direction, the screw pitch is minimum when the screw pitch reaches the tail end of the premixing chamber 3, and the effect of buffering premixed gas is achieved to a certain extent while the flow speed is increased.
As shown in fig. 1, the flange 5 is made of aluminum and is used for connecting the pre-mixing chamber 3 and the pre-combustion chamber housing 6, and at the same time, the flange plays a role in heat dissipation to a certain extent, reduces the inlet temperature of the pre-combustion chamber cavity 7 and prevents backfire.
As shown in figures 1-4, the gradually-expanding structure of the sections of the variable-pitch spiral fins 4 and the precombustion chamber shell 6 plays a role in controlling the gas flow velocity, so that the combustor is not easy to be ignited, a combustion layer forms turbulent combustion at a lower gas flow velocity, the temperature distribution is more uniform, and the combustion is more sufficient.
As shown in fig. 5 to 8, the arrangement of the holes in the porous medium plate 8 is straight and gradually expands along the air intake direction. The aperture of the air inlet hole is 2mm, the aperture of the air outlet hole is 3mm, and the porosity is more than 80%. The gradual expansion structure improves the temperature distribution, so that the pollutant emission is lower, the pressure in the hole is small, the flame is easy to be fixed on a combustion layer, and the tempering is not easy. The single-layer porous medium plate is easy to disassemble and clean, and the service life is prolonged.
The use process of the invention is described below with reference to the accompanying drawings:
in this embodiment, the porous dielectric plate material 8 is made of a silicon carbide ceramic material, the prechamber casing 6 is made of a high temperature resistant nickel-chromium alloy material, and the heat resistant steel bracket 9 can be detached.
As shown in fig. 1, firstly, air and gas enter a premixing chamber 3 through an air pipe 1 and a gas pipe 2 respectively, incoming air and gas are fully mixed in the premixing chamber 3, compared with the traditional premixing chamber, the flow velocity is increased, and simultaneously, the effect of buffering the premixed gas is achieved to a certain extent, and simultaneously, the premixed gas in a cavity 7 of a precombustion chamber is not easy to flow back to the premixing chamber 3, so that the tempering phenomenon is caused; the mixed gas enters the cavity 7 of the precombustion chamber for further mixing, and the divergent structure of the shell 6 of the precombustion chamber achieves the effect of slowing down the speed of the premixed gas; the premixed gas uniformly enters the air inlet hole surface of the porous medium plate 8 for preheating, the preheated premixed gas enters the gradually-expanded hole diameter for combustion, the gradually-expanded structure improves the temperature distribution to enable the pollutant emission to be lower, the pressure in the hole is small, the flame is easy to stay in the combustion layer, and the tempering is not easy.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
It should be understood that reference to "a plurality" herein means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (7)

1. A single layer porous media burner, comprising: the device comprises an air inlet pipe, a fuel gas inlet pipe, a premixing chamber and a precombustion chamber;
the air inlet pipe is arranged at the upper part of the premixing chamber, the gas inlet pipe is arranged on the side wall of the premixing chamber, and gas introduced into the air inlet pipe and gas introduced into the gas inlet pipe are mixed in the premixing chamber;
the premixing chamber is fixedly connected with the precombustion chamber, and mixed gas in the premixing chamber is introduced into the precombustion chamber.
2. The single-layer porous medium burner as claimed in claim 1, wherein the premixing chamber is a cylindrical structure, and spiral ribs are arranged in the premixing chamber and fixedly connected with the inner wall of the premixing chamber.
3. The single-layer porous medium burner as claimed in claim 2, wherein the pitch of the spiral ribs arranged on the inner wall of the premixing chamber is variable, and the pitch is gradually reduced along the airflow direction.
4. The single layer porous media burner of claim 1, wherein the pre-chamber comprises: the pre-combustion chamber comprises a pre-combustion chamber shell, a pre-combustion chamber cavity, a porous medium plate and a heat-resistant steel bracket;
the pre-combustion chamber shell is of a rectangular table structure, and a pre-combustion chamber cavity is arranged in the pre-combustion chamber shell;
the porous medium plate is a single layer and is fixed at the air outlet end of the pre-combustion chamber shell through a heat-resistant steel support, and holes in the porous medium plate are of a circular truncated cone structure with a gradually-expanded certain angle.
5. The single-layer porous medium burner as claimed in claim 4, wherein the pores in the porous medium plate are arranged in a straight-through manner and gradually expand along the gas flow direction;
the aperture of the air inlet hole is 2mm, the aperture of the air outlet hole is 3mm, and the porosity is more than 80%.
6. The single-layer porous medium burner as claimed in claim 1, wherein the porous medium plate is made of silicon carbide ceramic material, the precombustion chamber shell is made of high-temperature-resistant nickel-chromium alloy material, and the heat-resistant steel support is of a detachable structure.
7. The single-layer porous medium burner as claimed in claim 1, wherein the inlet end of the pre-combustion chamber shell is connected with the pre-mixing chamber through a flange.
CN202210267266.7A 2022-03-18 2022-03-18 Single-layer porous medium burner Pending CN114719255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210267266.7A CN114719255A (en) 2022-03-18 2022-03-18 Single-layer porous medium burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210267266.7A CN114719255A (en) 2022-03-18 2022-03-18 Single-layer porous medium burner

Publications (1)

Publication Number Publication Date
CN114719255A true CN114719255A (en) 2022-07-08

Family

ID=82238712

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210267266.7A Pending CN114719255A (en) 2022-03-18 2022-03-18 Single-layer porous medium burner

Country Status (1)

Country Link
CN (1) CN114719255A (en)

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