CN109737411B

CN109737411B - Optimization design method for air outlet distribution rule of combustor

Info

Publication number: CN109737411B
Application number: CN201910151753.5A
Authority: CN
Inventors: 钟兵; 毋青松; 钟梦遥; 刘宗泽; 邹振宁; 冷学力; 崔林
Original assignee: Shandong Jiaotong University
Current assignee: Shandong Jiaotong University
Priority date: 2018-03-27
Filing date: 2018-03-27
Publication date: 2021-01-26
Anticipated expiration: 2038-03-27
Also published as: CN108413368B; CN109945151A; CN108413368A; CN109737411A; CN109945151B

Abstract

The invention provides an optimized design method of an air outlet of a burner, wherein the burner comprises a burner base, a burner head provided with a plurality of atomization holes is fixedly installed in the burner base, the burner base is provided with a plurality of air outlets for supplying combustion improver to the burner head, the outer side of the burner base is provided with an air supply channel communicated with the air outlet, and the air supply channel is provided with an air inlet; the furnace ring is a hollow interlayer, a plurality of air return ports are arranged on the upper portion of the interlayer wall of the inner layer of the furnace ring, an inner cavity of the furnace ring is communicated with the air supply channel, a plurality of air outlets are arranged from the lower portion to the upper portion, and the distribution rule of the air outlets of the combustor is designed according to the following method: along the height direction, m (H)' <0,0< H < K; d (H)' >0, L < H < 2K; and 2K is the total height. The invention adopts a new design method of the outlet distribution of the combustor, so that the designed combustor has more sufficient combustion effect and the combustion efficiency is improved.

Description

Optimization design method for air outlet distribution rule of combustor

Technical Field

The invention relates to a combustor technology, in particular to an optimization design method of a combustor.

Background

The heat pipe technology is a heat transfer element called a heat pipe invented by George Grover (George Grover) of national laboratory of Los Alamos (Los Alamos) in 1963, fully utilizes the heat conduction principle and the rapid heat transfer property of a phase change medium, quickly transfers the heat of a heating object to the outside of a heat source through the heat pipe, and the heat conduction capability of the heat transfer element exceeds the heat conduction capability of any known metal.

The heat pipe technology is widely applied to the industries of aerospace, military industry and the like, and since the heat pipe technology is introduced into the radiator manufacturing industry, the design idea of the traditional radiator is changed for people, the single heat radiation mode that a high-air-volume motor is used for obtaining a better heat radiation effect is avoided, the heat pipe technology is adopted for enabling the radiator to obtain a satisfactory heat exchange effect, and a new place in the heat radiation industry is opened up. At present, heat pipes are widely applied to various heat exchange devices, including the field of electric power, such as waste heat utilization of power plants.

A vaporizer is a mechanical device that uses the heat energy of a fuel or other energy source to heat water into steam. The evaporator has wide application field and is widely applied to places such as clothing factories, dry cleaning shops, restaurants, bunkers, canteens, restaurants, factories and mines, bean product factories and the like. The existing evaporator is also widely applied to the treatment of various diseases, especially to the treatment of chronic diseases caused by aging and old damage of muscles, ligaments and the like, for example, the CN2167709Y patent, but in the existing technology, for example, the CN2167709Y patent, because the steam is generated directly by heating, the temperature of the generated steam is too high, and the moisture in the generated steam is too high, and the medicine is possibly deposited at the lower part because of particles, so the content of effective components in the ejected steam is too low, and the temperature is too high, and the intelligent degree in the existing technology is not high, and the effective intelligent operation cannot be carried out.

In the prior art, the phenomenon of uneven mixing of air and fuel gas of a combustor causes insufficient combustion. There is therefore a need to improve the mixing of gas and air so that the combustion is uniform.

Aiming at the problems, the invention is improved on the basis of the prior invention, and provides a gas evaporator with a novel structure, which makes full use of a heat source, reduces energy consumption and improves combustion effect.

Disclosure of Invention

In order to solve the problems, the invention is improved on the basis of the previous invention, and provides a new evaporator with a heat pipe structure, so as to realize the full utilization of waste heat.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a gas steam generator comprises a water tank and a burner, wherein the water tank is arranged on the burner, the burner comprises a burner base, a furnace ring for placing the water tank is fixedly arranged on the burner base, a burner head with a plurality of atomizing holes is fixedly arranged in the burner base, a gas pipe is arranged at the bottom of the burner base, a plurality of air outlets for supplying combustion improver to the burner head are arranged on the burner base, an air supply channel communicated with the air outlets is arranged on the outer side of the burner base, and an air inlet is arranged on the air supply channel; the burner is characterized in that the distribution density of the atomization holes is smaller and smaller along the outward radial direction of the center of the combustion head.

Preferably, the gas-fired boiler further comprises a heat pipe, the water tank comprises a water inlet and a steam outlet, the heat pipe comprises a vertical part, a horizontal part and a vertical pipe, the bottom end of the vertical part is communicated with the horizontal part, the lower part of the horizontal part is communicated with a plurality of vertical pipes, the vertical pipe is an evaporation end of the heat pipe, the vertical part is a condensation end of the heat pipe, the vertical part extends into the bottom of the water tank, and the vertical pipe and the horizontal part are arranged in the gas-fired burner; the heat pipes are at least two, and a communicating pipe is arranged between the vertical parts of the adjacent heat pipes.

Preferably, the distance between the adjacent communication pipes increases from the lower portion of the vertical portion to the upper portion of the vertical portion.

Preferably, the distance between the adjacent communication pipes is increased more and more from the lower portion of the vertical portion to the upper portion of the vertical portion.

Preferably, the vertical portion is of a plate-type construction.

Preferably, the horizontal portion extends from the bottom end of the vertical portion in a direction away from the vertical portion, and the vertical portion is a plurality of pipes extending to the bottom of the water tank.

Preferably, the furnace ring is of an arc-shaped structure.

As preferred, the external diameter of vertical pipe is d, and the distance between the adjacent vertical pipe centre of a circle of same row is L, and the centre of a circle of vertical pipe and two vertical pipe centre of a circle that are close to of adjacent row constitute isosceles triangle's apex angle be N, then satisfy following requirement:

Sin（N）=a-b*S²-c × S, where Ln is a logarithmic function, S = d/(M2-M1), a, b, c are parameters, satisfying the following requirements:

0.795<a<0.805, 0.525<b<0.535,0.895<b<0.905；

preferably, a =0.803, b =0.529, and c = 0.903.

Preferably, 0.3< d/L < 0.5.

Preferably, a is larger, b is smaller, and c is larger as d/L is smaller.

Compared with the prior art, the invention has the following advantages:

1) according to the invention, through the change of the diameters of the upper part and the lower part of the air outlets, the air output quantity of the upper part and the lower part is small, so that the combustion-supporting air from the upper part to the lower part is gradually increased and then gradually reduced, even if an air mass caused by the air quantity at the maximum position exists, the air mass and the air mass are gradually and fully mixed through the gradual reduction of the air quantity at the upper part and the lower part, the air is gradually mixed with the fuel gas, a sufficient mixing effect is achieved, the phenomenon that the fuel gas is suddenly impacted by a large amount of air at the upper part or the lower part, so that the air forms a large mass, the air and the fuel gas are not well mixed, the air quantity is maximum at the middle part, and the mixing of the large air mass and the. Through a large amount of experiments and numerical simulation's research discovery, through above-mentioned setting, can make air gas intensive mixing, the combustion effect improves about 10%.

2) The invention improves the condensation end structure of the heat pipes in the gas evaporator, arranges the communicating pipes between the adjacent condensation sections, and can avoid uneven heating among the heat pipes, realize pressure balance among the heat pipes and avoid the defects caused by uneven heating among different heat pipes.

3) The invention can ensure that the pressure is balanced as soon as possible in the flowing process of the fluid by connecting the distribution quantity and the change rule of the pipe diameters.

4) According to the invention, through the distribution density and the diameter change of the air outlet of the combustor in the height direction, the air and the fuel gas can be fully mixed, and the full combustion is achieved.

5) The invention improves the structure of the evaporation end of the heat pipe in the evaporator, extends the evaporation end of the heat pipe to a farther direction, and increases the heat absorption area of the evaporation end of the heat pipe under the condition of not changing the volume of the condensation end of the heat pipe, thereby expanding the heat absorption range of the heat pipe and absorbing the heat at the farthest end of a heat source. Compared with the heat pipe in the prior art, the size of the evaporation end and the condensation end of the heat pipe is kept consistent, and meanwhile, the volume and the occupied area of the heat exchanger are reduced, so that the structure is compact.

6) According to the invention, the communicating pipe is arranged at the adjacent evaporation ends, so that under the condition that the pressures of the vertical pipes are different due to different heating, the fluid in the evaporation end with large pressure can quickly flow to the evaporation end with small pressure, thereby keeping the overall pressure balance and avoiding local overheating or overcooling.

Drawings

Fig. 1 is a schematic view of a first embodiment of a steam generator according to the present invention.

Fig. 2 is a schematic view of a second embodiment of the steam generator of the present invention.

Fig. 3 is a schematic structural view of the communicating pipe provided adjacent to the heat pipe according to the present invention.

Fig. 4 is a schematic structural diagram of the communication pipe provided adjacent to the heat pipe according to the present invention.

Fig. 5 is a schematic view of the burner structure of the present invention.

In the figure: 1-a burner base, 2-a furnace ring, 3-a combustion head, 4-an air supply channel, 5-a combustion chamber, 7-an atomization hole, 8-a heat insulation material, 10-a heat pipe, 111-an air supply port, 112-an air outlet, 121-an air inlet, 211-an air return port, 101-a vertical part, 102-a horizontal part, 103-a vertical pipe, 104-a circular pipe, 105-a water tank, 106-a heat source channel, 108-a water inlet, 109-a steam outlet, 110-a condensation pipe and 21 an inner-layer sandwich wall.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

In this document, "/" denotes division and "×", "denotes multiplication, referring to formulas, if not specifically stated.

As disclosed in fig. 1-2, the gas steam generator using the heat pipe comprises a water tank 105 and a heat pipe 10, wherein the water tank 105 comprises a water inlet 108 and a steam outlet 109, the heat pipe comprises a vertical part 101, a horizontal part 102 and a vertical pipe 103, wherein the bottom end of the vertical part 101 is communicated with the horizontal part 102, the lower part of the horizontal part 102 is communicated with a plurality of vertical pipes 103, wherein the vertical pipe 103 is the evaporation end of the heat pipe, and the vertical part 101 is the condensation end of the heat pipe. The vertical portion 101 extends into the bottom of the tank 105 for heating the liquid in the tank. The vertical pipe 103 and the horizontal portion 102 are disposed in the heat source.

In operation, the evaporator absorbs heat from a heat source through the vertical pipe 103, then fluid in the vertical pipe 103 evaporates and enters the vertical part through the horizontal part, then the heat is released to water in the water tank at the vertical part, and the fluid condenses and enters the vertical pipe 103 again under the action of gravity.

Preferably, the vertical portion is a flat tube structure.

Preferably, the number of the heat pipes is at least two, and a communication pipe is arranged between the vertical parts 101 of the adjacent heat pipes. For example, as shown in fig. 3 and 4, a communication pipe is provided between the vertical portions 101 of two heat pipes adjacent to each other. Through setting up communicating pipe, can avoid being heated unevenly between the heat pipe, realize the pressure balance between the heat pipe, avoid the defect that the inhomogeneous results in of being heated between the different heat pipes.

Preferably, the distance between the adjacent communication pipes is increased from the lower portion of vertical portion 101 to the upper portion of vertical portion 101. The purpose is in order to set up more communicating pipes, because along with the upward flow of the vertical some fluid of heat pipe, the continuous heat release of fluid, along with the continuous heat release of fluid, the pressure in different heat pipes reduces gradually, consequently through above-mentioned setting, can guarantee to reach pressure equilibrium as early as possible in the fluid flow process, material saving.

Preferably, the distance between adjacent communication pipes is increased more and more from the lower portion of vertical portion 101 to the upper portion of vertical portion 101. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.

Preferably, the diameter of the communication pipe is continuously reduced from the lower portion of vertical portion 101 to the upper portion of vertical portion 101. The purpose is to ensure a larger communication area, because the fluid continuously releases heat along with the upward flow of the fluid, and the pressure in different heat pipes is smaller and smaller along with the continuous heat release of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the flowing process of the fluid through the arrangement.

Preferably, the diameter of the communication pipe is decreased more and more from the lower portion of vertical portion 101 to the upper portion of vertical portion 101. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.

Preferably, as shown in fig. 1, the horizontal portion 102 extends from the bottom end of the vertical portion 101 to a direction away from the vertical portion 101. The evaporator is improved by arranging the structure of the evaporation end of the heat pipe, the evaporation end of the heat pipe is extended to a farther direction, and the heat absorption area of the evaporation end of the heat pipe is increased under the condition of not changing the volume of the condensation end of the heat pipe, so that the heat absorption range of the heat pipe can be expanded, and the heat at the farthest end of a heat source can be absorbed. Compared with the heat pipe in the prior art, the heat exchange efficiency can be improved by more than 45 percent by keeping the evaporation end and the condensation end of the heat pipe in consistent sizes. Meanwhile, the volume and the occupied area of the condensation end are reduced, so that the structure is compact.

Preferably, the horizontal portions of the two heat pipes extend in opposite directions, respectively. Through setting up two symmetrical heat pipes, can absorb heat in the equidirectional demand that satisfies the heat transfer.

Preferably, the water tank is provided with a liquid medicine. The evaporator is an evaporator with a medicine fumigation and washing treatment function.

Preferably, the generated steam is directly discharged from the steam outlet 109.

As another option, the evaporator further comprises a liquid medicine evaporation tank, the liquid medicine evaporation tank is communicated with the water tank 105 through a pipeline, an atomizer is arranged in the liquid medicine evaporation tank, and the liquid medicine evaporation tank is provided with a steam outlet.

The water tank is internally provided with medicines which are soaked in water, when the medicine water heater is used, water is heated in the water tank through the heat pipe, the medicines are heated through the water, and therefore liquid medicine is generated in the water tank 105. The generated liquid medicine enters the liquid medicine evaporation tank through a pipeline, is atomized in the liquid medicine evaporation tank and is discharged through the steam outlet. The vapor outlet may be discharged directly against the patient's diseased site for treatment.

As shown in fig. 1 and 2, the burner includes a burner base 1, a furnace ring 2 for placing a water tank 105 is fixedly installed on the burner base 1, a burner head 3 with a plurality of atomizing holes 7 is fixedly installed in the burner base 1, an air supply port 111 connected with a gas pipeline is arranged at the bottom of the burner base 1, a plurality of air outlets 112 for supplying combustion air to the burner head 3 are arranged on the burner base 1, an air supply pipe 4 communicated with the air outlets 112 is arranged at the outer side of the burner base 1, an air inlet 121 is arranged on the air supply pipe 4, and a shell of the air supply pipe 4 covers the burner base 1, so that the burner base 1 can be used for heating the entering air, and the heat energy of the gas can be saved. Preferably, the burner head 3 is of circular configuration, as seen from above

The plurality of atomization holes 7 are arranged on the combustion head 3, so that the fuel gas can achieve the best atomization effect, the fuel gas can be sufficiently combusted, the furnace ring 2 is horn-shaped, the opening part of the furnace ring 2 is circular corresponding to the outer wall of the water tank, the water tank can be uniformly heated, the temperature in the boiler can be quickly raised, the furnace ring 2, the water tank and the burner base 1 form a combustion chamber 5 for preventing flame from flowing outwards, the flame in the combustion chamber does not overflow along the bottom of the boiler, the heat energy is prevented from being taken away by the high-temperature flame, the heat energy loss phenomenon of 20% -30% of the total heat supplied by the fuel gas is solved, meanwhile, the temperature of the surrounding environment is not raised due to the heat taken away by the high-temperature flame, and the operating environment in the kitchen is improved; the furnace ring 2 is a hollow interlayer, a plurality of air return ports 211 are arranged on the inner interlayer wall 21 of the furnace ring 2 close to the opening part of the furnace ring, and the inner cavity of the furnace ring 2 is communicated with the air supply channel 4.

And a waste gas auxiliary exhaust port 22 communicated with the combustion chamber 5 and the outside is arranged at a position close to the bottom end on the furnace ring 2, so that the gas after full combustion is exhausted out of the combustion chamber, the gas in the combustion chamber can be better mixed with fresh air and fully combusted, and the generation of harmful gas is inhibited.

The outer surface of the furnace ring 2 is coated with a heat insulation material 8, and the inner surface of the furnace ring 2 can also be simultaneously coated with the heat insulation material 8. This prevents heat loss and also prevents the surrounding environment from increasing in temperature due to heat loss.

The fan blows air into the combustion chamber from the air inlet, the air supply channel and the air outlet, the air is mixed and combusted with fuel gas which is atomized into the combustion chamber from the air supply port through the atomization hole in the combustion chamber, the water tank is heated, the temperature of the gas in the combustion chamber is also increased, most of insufficiently combusted high-temperature gas (the temperature of the high-temperature gas can reach more than 800 ℃) can pass through the return air inlet 211 and then returns to the combustion chamber for combustion through the inner cavity of the furnace ring, the air supply channel and the air outlet, the heat of the insufficiently combusted high-temperature gas can be recycled and fully combusted, the consumption of the fuel gas is greatly reduced, the generation of carbon monoxide and nitrogen-hydrogen compounds which are extremely harmful to human bodies is inhibited, meanwhile, partial waste gas generated in the combustion chamber is discharged from a gap between the water tank and the furnace ring, and because the gap between the water tank and the furnace ring is very small, therefore, the burning flame can not overflow from the gap, so that the heat loss is less, and a small part of waste gas generated in the combustion chamber is discharged through the waste gas auxiliary exhaust port.

Preferably, as shown in fig. 1 and 2, the furnace ring is in an arc structure.

Preferably, the plurality of air outlets 112 are provided from the lower portion to the upper portion, and the air outlets are distributed at a density which is first increased and then decreased at a certain position from the lower portion to the upper portion. The upper portion through setting up a plurality of air outlets 112 is to the change of the distribution density of lower part position, the air output through upper and lower position is little, make upper portion to the combustion-supporting air of lower part increase gradually, then reduce gradually, make even the air group that maximum position department air quantity leads to exist, but the volume of air through upper portion lower part reduces gradually and makes the air group and then gradual intensive mixing, make air gradual mix with the gas like this, reach abundant mixed effect, avoid the gas of assaulting suddenly of a large amount of air in upper portion or lower part, make the air form the existence of big group, cause the mixture of air gas not good. Through a large amount of experiments and numerical simulation's research discovery, through above-mentioned setting, can make air gas intensive mixing, the combustion effect improves about 10%. It should be noted that the above results are obtained by the present applicant through a lot of studies and are not common knowledge in the art.

Preferably, the plurality of air outlets are arranged from the lower part to the upper part, the air outlet distribution has an increasing density with decreasing amplitude from the lower part to the upper part, and the air outlet distribution has an increasing density with decreasing amplitude starting at a certain position. Through a large amount of experiments and numerical simulation research discovery, this setting can make air and gas more abundant mixture, improves combustion efficiency.

Preferably, the certain position is an intermediate position in the height direction of the hob 2.

Preferably, the plurality of air outlets 112 are provided from the lower portion to the upper portion, and the diameter of the air outlets is first increased and then decreased at a certain position from the lower portion to the upper portion. Through the change of the upper portion to the diameter of lower part position that sets up a plurality of air outlets 112, the air output through upper and lower position is little, make upper portion to the combustion-supporting air of lower part increase gradually, then reduce gradually, make even the air group that maximum position department air quantity leads to exist, but the volume of air through the upper portion lower part reduces gradually and makes air group and then gradual intensive mixing, make air gradual mix with the gas like this, reach abundant mixed effect, avoid the gas of assaulting suddenly of a large amount of air in upper portion or lower part, make the air form the existence of big group, cause the mixture of air gas not good. Through a large amount of experiments and numerical simulation's research discovery, through above-mentioned setting, can make air gas intensive mixing, the combustion effect improves about 10%. It should be noted that the above results are obtained by the present applicant through a lot of studies and are not common knowledge in the art.

Preferably, the air outlet diameter decreases progressively from the lower part to the upper part, and at a certain point, the air outlet diameter decreases progressively more. Through a large amount of experiments and numerical simulation research discovery, this setting can make air and gas more abundant mixture, improves combustion efficiency.

The vertical pipes are multiple, and the distribution density of the vertical pipes is smaller and smaller along the radial direction from the center of the combustor to the outside. In numerical simulations and experiments, it was found that a single vertical tube receives less and less heat in a radial direction from the center of the burner, and the temperatures of the vertical tubes at different positions are different, thereby causing local heating unevenness. Since the gas is first burned at the middle portion as the gas is burned, and then the generated high-temperature gas moves outward from the center, the amount of heat received from the middle portion to the outside is gradually reduced, and since the more outward, the more the horizontal portion area is increased due to the increase in the diameter, the less the amount of heat distributed per unit area is also reduced, thereby reducing the amount of heat distributed per vertical pipe. This results in uneven heating of the vertical tubes at different locations, resulting in different temperatures. According to the invention, the densities of the vertical pipes arranged at different positions of the combustor are different, so that the temperature of the whole heat pipe is kept basically the same, the whole heat exchange efficiency is improved, materials are saved, local damage caused by uneven temperature is avoided, and the service life of the heat pipe is prolonged.

Preferably, the distribution density of the vertical tubes is continuously increased to a smaller and smaller extent in a radial direction outward from the center of the burner. As the change of the distribution density of the vertical pipe, the invention carries out a large number of numerical simulations and experiments, thereby obtaining the change rule of the distribution density of the vertical pipe. Through the change rule, materials can be saved, and meanwhile, the heat exchange efficiency can be improved by about 9%.

Preferably, the diameter and length of each of the vertical tubes 103 are the same.

Preferably, the number of the vertical pipes 103 is multiple, and the pipe diameter of the vertical pipe is smaller and smaller along the radial direction from the center of the burner to the outside. The specific reason is the same as the reason for the distribution density of the vertical tubes as before.

Preferably, the diameter of the vertical pipe is gradually increased in a smaller and smaller range along a radial direction outward from the center of the burner. The specific reason is the same as the reason for the distribution density of the vertical tubes as before.

Preferably, the distribution density and length of all the vertical tubes 103 are the same.

Preferably, the distribution density of the atomizing holes 7 is smaller and smaller along the radial direction from the center of the burner head 3 to the outside. Guarantee that the gas increases gradually from outside to the quantity distribution in the middle of, a large amount of gas are located middle part position abundant burning, from middle part burning then flue gas from backward flow hole 211 discharge during the burning for the flue gas can all heat the face and heat, guarantees the even of whole heating.

Preferably, the distribution density of the atomizing holes 7 increases in a smaller and smaller range along the radial direction outward from the center of the burner head 3. As the change of the distribution density of the atomizing holes, the invention carries out a large number of numerical simulations and experiments, thereby obtaining the change rule of the distribution density. Through the change rule, the uniformity of heating can be further ensured.

Preferably, the diameter of the atomizing holes 7 becomes smaller and smaller in a radial direction outward from the center of the burner head 3.

Preferably, the diameter of the atomizing holes 7 increases in a smaller and smaller range in a radial direction outward from the center of the burner head 3. The main reasons are the same as before.

Preferably, as shown in fig. 1, the water tank 105 and the burner form a spherical structure, and the sphere 104 is divided into an upper part and a lower part, wherein the upper part is the water tank 105, and the lower part is the burner. Through the arrangement, the heat pipe and the heat exchange fluid can be completely arranged in the ball, so that the external space can be fully utilized, and the purpose of compact structure is achieved.

Preferably, as shown in FIG. 1, the cross-sectional area of the upper portion is 50 to 80%, more preferably 60 to 70%, of the cross-sectional area of the lower portion. Through the area distribution, the heat absorption and the heat dissipation of the heat pipe can achieve the purpose of uniform coordination.

Preferably, as shown in fig. 1, two heat pipes are disposed in the spherical ball, and the vertical portions 101 of the heat pipes 10 are disposed close to each other.

FIG. 2 illustrates an embodiment of a second distribution of heat pipes in a stack. As shown in fig. 2, the water tank 105 has a trapezoidal cross section. The upper bottom of the trapezoid structure is located at the upper part of the vertical part 101, and the lower bottom is located at the upper part of the horizontal part. The heat exchange efficiency can be further improved by arranging the novel trapezoidal structure shown in fig. 2. Because the vertical part along with the heat pipe upwards, the vertical part of heat pipe is continuous to participate in the heat transfer, therefore vertical part lower part temperature is the highest, through setting up trapezium structure, can make the lower part hot water many, upper portion hot water is few, reaches the purpose of even heat transfer. And through setting up trapezium structure, can make external structure compact, outside space can realize make full use of. For example, the position of the waist of the trapezoid structure can be provided with other objects, such as objects needing drying.

Preferably, the upper base of the trapezoid structure is 40-60%, more preferably 50% of the lower base.

Preferably, the trapezoid is an isosceles trapezoid.

Further preferably, the angle formed by the lower base of said trapezoid and the waist is 29-67 °, preferably 40-50 °.

Through foretell configuration optimization, can realize the even and the improvement of heat exchange efficiency of heat transfer in the at utmost.

Preferably, as shown in fig. 3 and 4, the system comprises two heat pipes, and the horizontal parts 102 of the two heat pipes extend towards opposite directions respectively.

Preferably, a communication pipe is provided between the vertical pipes 103 of the adjacent heat pipes. For example, a communication pipe is provided between the vertical pipes 103 of two heat pipes adjacent to each other. By arranging the communicating pipe, uneven heating between evaporation ends of the heat pipes can be avoided, pressure balance between the heat pipes is realized, and the defect caused by uneven heating between different heat pipes is avoided.

Preferably, the distance between the adjacent communication pipes is continuously decreased from the lower portion of the vertical pipe 103 to the upper portion of the vertical pipe 103. The purpose is to arrange more communicating pipes, because the fluid is continuously heated along with the upward flow of the fluid, and the heating in different heat pipes is more and more uneven along with the continuous heating of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the flowing process of the fluid through the arrangement.

Preferably, the distance between the adjacent communication pipes is decreased more and more from the lower portion of the vertical pipe 103 to the upper portion of the vertical pipe 103. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.

Preferably, the diameter of the communication pipe is increased from the lower portion of the vertical pipe 103 to the upper portion of the vertical pipe 103. The purpose is to ensure a larger communication area, because the fluid is continuously heated along with the upward flow of the fluid, and the heating in different heat pipes is more and more uneven along with the continuous heating of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the fluid flowing process through the arrangement.

Preferably, the diameter of the communication pipe is increased more and more from the lower portion of the vertical pipe 103 to the upper portion of the vertical pipe 103. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.

Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An optimized design method for distribution rules of air outlets of a combustor comprises a combustor base, a combustion head provided with a plurality of atomization holes is fixedly installed in the combustor base, a plurality of air outlets for supplying combustion improver to the combustion head are arranged on the combustor base, an air supply channel communicated with the air outlets is arranged on the outer side of the combustor base, and air inlets are arranged on the air supply channel; the furnace ring is a hollow interlayer, a plurality of air return ports are arranged on the upper portion of the interlayer wall of the inner layer of the furnace ring, and an inner cavity of the furnace ring is communicated with the air supply channel, and the furnace ring is characterized in that a plurality of air outlets are arranged from the lower portion to the upper portion, and the distribution rule of the air outlets of the combustor is designed according to the following method:

a plurality of air outlets are arranged along the height direction, and the diameters of the air outlets are increased from the lower part to the upper part, are at a certain position and then are gradually reduced, and the certain position is the middle position in the height direction of the furnace ring;

the air outlet diameter decreases progressively from the lower part to the upper part, starting at a position intermediate in the height direction of the hob.

2. The design method of claim 1, wherein said hearth ring has an arcuate configuration.