CN206563295U - A kind of porous media combustor of radially layered with phase-transition heat-storage - Google Patents

Abstract

A radial layered porous media burner with phase change heat storage, relating to a porous media burner, the burner includes a thermal insulation layer, a small ceramic ball layer and a large ceramic ball layer as a combustion zone, and a ceramic foam layer , equalizer plate, gas inlet, and air inlet; a central cylinder is set in the center of the burner, and the phase change material layer is filled in the central cylinder, and the small ceramic ball layer and the large ceramic ball layer are arranged at radial intervals; the top of the central cylinder is open, and the central cylinder Closed bottom. The burner suppresses the unstable phenomenon of flame propagation in porous media and improves combustion stability. The burner can burn common fuels such as petroleum liquefied gas and natural gas, and can also burn low calorific value gas fuels with a calorific value close to 4000kJ/m ³ .

Description

A radially stratified porous media burner with phase change heat storage

technical field

The utility model relates to a porous medium burner, in particular to a porous medium burner with radial stratification and phase change heat storage.

Background technique

The prominent contradiction between energy supply and demand, the increasingly serious environmental pollution and the continuous destruction of ecology are the main problems facing my country's economic development. Therefore, improving energy utilization rate and realizing clean utilization of energy is an important method to solve the above problems.

Porous media combustion technology has the advantages of wide application range, large adjustable power range, and low pollutant emission. It has become a new research hotspot in the world and is receiving more and more research and attention. The use of porous media combustion technology can also realize the stable combustion of organic or industrial waste gas with extremely low calorific value, fuel reforming, coal gasification and the development of super adiabatic engines, etc., which has a broad application range and development prospects. Research on porous media combustion technology will help our country save energy, improve energy consumption level, alleviate the contradiction between energy supply and demand, and reduce environmental pollution at the same time.

At present, there are many applications of porous media combustion technology in the market. The invention patent with the publication number of 101929676A "a catalytic porous media burner" has foam ceramics and catalytic metal fiber felt in its combustion chamber. Lower combustion temperature and reduce pollutant emissions. Publication No. 101158469 is an invention patent "a segmented porous ceramic medium gas fuel burner". Burn near material interface. The invention patent of the publication number CN2484481Y "gradually variable porous media burner" has porous media materials with different porosities arranged in sequence along the axial direction of the burner, which improves the combustion efficiency of the burner and reduces the emission of pollutants.

In the application of the above porous media combustion technologies, they all face the instability problem of flame combustion in porous media. Due to the uneven structure of the porous medium, the combustible gas is tilted and broken during the combustion process of the porous medium, resulting in uneven load distribution inside the burner, unstable combustion, increased pollutant emissions, and eventually flameout. These problems seriously restrict the popularization of porous media combustion technology. In recent years, phase change materials have been widely promoted due to their characteristics of latent heat of phase change, but there are no related reports on the application of high temperature phase change materials to porous media combustion technology.

Contents of the invention

The purpose of this utility model is to provide a radially layered porous media burner with phase change heat storage, the burner changes the radial porosity distribution of the porous medium in the combustion zone and increases the phase change heat storage method of the burner central cylinder The invention solves the problem of inclination and rupture of the porous medium flame in the prior art, reduces the combustion efficiency of the porous medium burner, and reduces the emission of pollutants.

The purpose of this utility model is achieved by the following technical solutions:

A radial layered porous media burner with phase change heat storage, the burner includes a thermal insulation layer, a small ceramic ball layer and a large ceramic ball layer as a combustion zone, a foam ceramic layer, an equalizer plate, a gas inlet, Air inlet; a central cylinder is set in the center of the burner, and the central cylinder is filled with a phase-change material layer, and the small ceramic ball layer and the large ceramic ball layer are arranged at radial intervals; the top of the central cylinder is open, and the bottom of the central cylinder is closed.

The said radial layered porous media burner with phase change heat storage has one central tube.

In the radial layered porous media burner with phase change heat storage, the small ceramic ball layer and the large ceramic ball layer are arranged at intervals.

Advantage and effect of the present utility model are:

1. The radial porosity distribution of the porous medium in the combustion zone of the utility model, the porosity of the small ceramic ball layer is smaller than that of the large ceramic ball layer, thereby increasing the combustion load of the large ceramic ball layer combustion zone and reducing the combustion load of the small ceramic ball layer combustion zone load, thereby reducing the heat dissipation of the burner wall and improving the combustion efficiency of the porous media burner.

2. In the utility model, a central cylinder is arranged in the center of the burner, and the inside is filled with a phase-change material layer, which enhances the heat storage capacity of the burner through phase-change heat storage. When the flame front in the porous media burner is tilted and broken, the phase change material layer in the central tube can absorb the heat of the high temperature combustion zone of the tilted or broken flame and convert it into phase change heat, and at the same time release the phase change heat to the low temperature combustion zone, suppressing The unstable phenomenon in the process of flame propagation is eliminated, the emission of pollutants is reduced, and the combustion stability is enhanced.

Description of drawings

Fig. 1 is the schematic diagram of the utility model device.

Among them: 1. Insulation layer, 2. Small ceramic ball layer, 3. Large ceramic ball layer, 4. Center tube, 5. Phase change material layer, 6. Foam ceramic layer, 7. Even flow plate, 8. Gas inlet, 9. Air inlet.

detailed description

The utility model is described in detail below in conjunction with the embodiment shown in the accompanying drawings.

Example

The specific structure of the utility model is described in detail according to Fig. 1 . The utility model adopts the gas and air premixed combustion method, including insulation layer, small ceramic ball layer, large ceramic ball layer, central cylinder, phase change material layer, foam ceramic layer, equalizer plate, gas inlet and air inlet. From the wall to the center of the burner, an insulation layer 1, a small ceramic ball layer 2, a large ceramic ball layer 3, a central cylinder 4, and a phase change material layer 5 are sequentially arranged. In the burner, the small ceramic ball layer and the large ceramic ball layer are arranged downwards in sequence with a foam ceramic layer 6 , an equalizer plate 7 , a gas inlet 8 and an air inlet 9 . The central tube 4 is closed at the bottom and open at the top.

The specific working principle is as follows:

The large ceramic ball layer and the small ceramic ball layer are arranged at intervals along the radial direction of the burner. The large ceramic ball is inside and the small ceramic ball is outside. The porosity of the porous medium in the combustion zone is small on the outside and large on the inside. The gas flow resistance of the spherical layer increases the gas flow of the large ceramic spherical layer and reduces the gas flow of the small ceramic spherical layer during the combustion process, thus increasing the combustion load of the combustion area of the large ceramic spherical layer and reducing the combustion load of the combustion area of the small ceramic spherical layer. The heat dissipation outside the burner is reduced, and the combustion efficiency of the burner is improved. The central cylinder is closed at the bottom and open at the top, which can adapt to the volume change during the phase change process of the internal phase change material. The phase change material adopts high-temperature phase change material, and the phase change material conducts heat exchange through the wall surface of the central cylinder. When the flame front in the porous medium in the burner is tilted or broken, the combustion load distribution inside the burner is uneven, the local temperature in the combustion area is high, and the local temperature is low, and the heat of the phase change material in the central cylinder absorbs the heat in the high temperature combustion area , heating the low-temperature combustion area, improving the uniformity of load distribution in the combustion area, thereby improving the stability of the burner flame and reducing the emission of pollutants.

After the gas and air are mixed, they burn between the pores of the ceramic balls through the equalizer plate and the foamed ceramics. The arranged large ceramic ball layer and small ceramic ball layer change the radial porosity distribution and increase the combustion load of the large ceramic ball layer; the phase change material in the central cylinder absorbs and releases phase change latent heat through phase change, and the internal load of the burner When the distribution is uneven, the phase change material in the central cylinder absorbs the heat of the high-temperature combustion zone and heats the low-temperature combustion zone at the same time. The burner suppresses the unstable phenomenon of flame propagation in porous media and improves combustion stability. The burner can burn common fuels such as petroleum liquefied gas and natural gas, and can also burn low calorific value gas fuels with a calorific value close to 4000kJ/m ³ .

Claims (3)

1. a kind of porous media combustor of radially layered with phase-transition heat-storage, it is characterised in that the burner include heat-insulation layer, It is used as the small ceramic layers of balls and big ceramic layers of balls, foamed ceramics layer, homogenizing plate, fuel gas inlet, air intake of combustion zone；Burner Filling phase-change material layers in centrally disposed central tube, central tube, small ceramic layers of balls and big ceramic layers of balls are arranged by spaced radial；Its Central tube open top, central tube bottom lock.

2. a kind of porous media combustor of radially layered with phase-transition heat-storage according to claim 1, it is characterised in that institute Central tube is stated for 1.

3. a kind of porous media combustor of radially layered with phase-transition heat-storage according to claim 1, it is characterised in that institute It is in arranged for interval to state between small ceramic layers of balls and big ceramic layers of balls.