CN111692522B

CN111692522B - Disc-shaped polishing-shaped diversion structure in gasification equipment

Info

Publication number: CN111692522B
Application number: CN202010386904.8A
Authority: CN
Inventors: 郭韵; 陈昊
Original assignee: Shanghai University of Engineering Science
Current assignee: Shanghai University of Engineering Science
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2022-07-12
Anticipated expiration: 2040-05-09
Also published as: CN111692522A

Abstract

The invention belongs to the technical field of gasification equipment, and relates to a disc-shaped throwing-hole-shaped flow guide structure in gasification equipment. Compared with the prior art, the invention increases the gasification contact area in the working state through the hexagonal contact holes on the surface of the disc, so that the disc is fully gasified, and the effect of accelerating heat and mass transfer is achieved; the structure can also be used in other diversion equipment and gasification equipment, and has wide application and high utilization rate.

Description

Disc-shaped polishing-shaped diversion structure in gasification equipment

Technical Field

The invention belongs to the technical field of gasification equipment, relates to a flow guide structure of peak regulation type gasification equipment, and particularly relates to a disc-shaped parabolic flow guide structure in the gasification equipment.

Background

Along with the continuous propulsion of liquefied natural gas in China, more and more people use the liquefied natural gas in China, the fist project of the natural gas in China and Russia is also ventilated, so the heating of the natural gas is unusual important, the gasification device is mainly used for heating the natural gas, and the peak value of gas utilization is different along with the difference of seasons, so the problem that the control gasification is outstanding is realized, and the guide structure of common gasification equipment does not have a good gas-liquid reaction which can be realized as much as possible.

The existing flow guide structure without contact holes is not meant to be an optimal choice, and the existing flow guide structure is a totally-enclosed type flow guide structure, which has the factors of incomplete gas-liquid reaction, high consumption energy and unstable gasification, and leads to uncontrollable and unpredictable gasification heat and mass transfer.

Disclosure of Invention

The invention aims to provide a disc-shaped parabolic flow guide structure in gasification equipment, which has the advantages of large gas-liquid contact area, sufficient gas-liquid reaction and low energy consumption.

The purpose of the invention can be realized by the following technical scheme:

the invention provides a disc-shaped throwing-hole-shaped flow guide structure in gasification equipment, which comprises a throwing-shaped disc, wherein a vertical sharp corner is arranged at the center of the throwing-shaped disc, the edge of the throwing-shaped disc is turned outwards upwards to form an arc-shaped flanging, and a plurality of hexagonal contact holes are formed in the throwing-shaped disc; when the device works, the bottom of the throwing disk is tangent to the liquid level.

During operation, from gasification equipment top nozzle structure blowout high temperature flue gas, the flue gas strikes downwards, strikes this disc throwing shape pore form water conservancy diversion structure on, this structure carries out the water conservancy diversion to high temperature flue gas, on the device's surface, owing to there is the hexagon contact hole, the liquid that is in this structure below passes through the hole, carries out fine heat transfer with the flue gas, and gasification, very big increase heat transfer area, the abundant and liquid contact of high temperature flue gas, after the heat transfer is carried out with liquid to high temperature flue gas, gasification and its liquid that carries out the heat transfer. Because the structure also has the function of flow guiding, the gasified liquid and the gas from the nozzle form an upward rotational flow under the flow guiding function of the throwing structure, thereby playing the role of gasification heat exchange.

According to the novel disc-polishing-shaped hole-shaped flow guide structure in the gasification equipment, the hexagonal contact holes are distributed on the surface of the novel disc-polishing-shaped flow guide structure, so that the novel disc-polishing-shaped flow guide structure has the characteristics of increasing the contact area, fully reacting gas and liquid and reducing energy consumption, thereby enhancing heat and mass transfer and improving the gasification efficiency. And this novel poroid water conservancy diversion structure can set up different apertures on its surface, the air vent of different shapes, the speed of gasification degree is felt to the big or small quantity shape of air vent, thereby artificial gasification in carrying out certain degree according to the demand that the natural gas need be heated, the speed of regulation and control heating natural gas, fine energy saving, raise the efficiency.

As a preferable technical scheme, the plurality of hexagonal contact holes are distributed on a plurality of circumferences taking the center of the parabolic disk as the center of a circle to form a plurality of circles of contact hole groups.

As a preferred technical scheme, the hexagonal contact holes of each circle of contact hole group are uniformly distributed along the circumference.

Preferably, the size of the hexagonal contact hole of the outer ring contact hole group is larger than that of the hexagonal contact hole of the inner ring contact hole group.

As a preferable technical scheme, the plurality of hexagonal contact holes form two circles of contact hole groups, the side length of the hexagonal contact holes of the two circles of contact hole groups is different according to the different jetting speeds of the nozzles, the side length ratio is different, the optimal selection is 1.1-1.25:1, because the flue gas jetted from the nozzles has the speed as high as 33m/s and is high temperature and is considered as incompressible fluid flowing in a turbulent way, the opening aperture difference is too large, and the flow guiding effect is lost.

As a preferable technical scheme, the distance between the center of the hexagonal contact hole (14) of the outer ring contact hole group and the center of the throwing disc (11) is 1.5-1.7 times of the distance between the center of the hexagonal contact hole (14) of the inner ring contact hole group and the center of the throwing disc (11). Further preferably, the value is 1.6. Thus, the flow guide effect of the disc structure can be ensured, and the best gasification effect can be ensured.

As a preferred technical scheme, the hexagonal contact hole is a regular hexagonal contact hole, and one side of the hexagonal contact hole faces to the center of the polishing disk.

As the preferred technical scheme, a plane part is arranged between the sharp corner of the throwing-shaped disc and the arc-shaped flanging, and the hexagonal contact holes are distributed on the plane part.

As a preferable technical scheme, the aperture ratio of the plane part of the throwing-shaped disc is 35-45%. Further preferably, when the plurality of hexagonal contact holes form two circles of contact hole groups, the number of the inner circle contact holes is preferably 8-9, the number of the outer circle contact holes is 11-12, no hole is adopted at the arc flanging position, and the whole hole forming range accounts for 39% of the total plane part. In the calculation of the invention, the speed of the high-temperature flue gas sprayed from the nozzle can reach 33m/s, the temperature is about 1200K, the sprayed flue gas is regarded as incompressible fluid flowing in a turbulent way, the high-temperature flue gas is sprayed to a bottom water pool, and water of the high-temperature flue gas needs to be gasified, so that the throw-type disc structure is very important, the proportion of the opening ratio on the gasification structure is about 40%, the sprayed flue gas is favorably and fully contacted with the water at the bottom of the disc, the original non-opened flue gas is inevitably not provided with the high gasification rate, if the opening ratio of the disc is continuously increased, the whole disc structure is very fragile, the high-speed and high-temperature flue gas cannot be borne, the diversion effect is weakened, and the heat exchange efficiency is reduced.

As a preferred technical scheme, the shape of the sharp corner is that the top end is an acute angle, and the angles increase downwards in sequence and are in a pointed shape; the acute angle of the top end of the sharp corner is 30-35 degrees. When the closed angle degree is too small, the flue gas that comes down to the injection is difficult for playing better water conservancy diversion effect to when the flue gas that comes from the high-speed injection contacts the disc, arouse splashing of disc, gasification that can not be fine, when the angle is too big, can form the resistance to the flue gas, the messenger flue gas that can not be fine contacts the liquid level, thereby reduces the gasification rate. The main acting forces of the flue gas flow are gravity and inertia force, and the optimal solution of the angle is obtained by the gradient design calculation of the maximum flow velocity sprayed by the nozzle and the experimental flow velocity.

The invention is mainly characterized in that the center of the throwing disc is provided with a sharp corner which is erected upwards and is used as a flow receiving structure, downward-sprayed smoke in a nozzle structure of the gasification furnace can be well received, the angle of the sharp corner is reduced as much as possible within an allowable range, so that the sharp corner is sufficiently sharp, the resistance caused by downward-sprayed smoke is favorably reduced, the dullness is eliminated, and a good flow guiding effect is achieved. The arc shape of the throwing disc is beneficial to guiding the smoke upwards well. The most notable aspect of the present invention is the hexagonal contact hole in the surface of the parabolic disk, which is not considered at all in the prior art, when the mechanism is operated in a gasification apparatus, the surface of which is in contact with the liquid to be gasified. The hexagonal contact hole is selected, so that the high aperture ratio and the high contact ratio are realized, the material and the space are saved, the utilization rate is high, and the design is attractive. Compared with the round shape, the hexagonal shape is favorable for reducing the tension of the water surface, a spherical film is not easy to form, and is more favorable for mixing and contacting gas and liquid compared with other shapes, so that the gasification is increased.

The structure is preferably detachable, different shapes or quantities can be designed on the surface of the disc, the significance lies in that the degree of gasification is not high, different shapes can be replaced when the gasification rate is slow, and the flow guide structures with different quantities of contact holes can artificially control the gasification amount and the gasification rate.

Compared with the prior art, the invention increases the gasification contact area in the working state through the hexagonal contact holes on the surface of the disc, so that the disc is fully gasified, and the effect of accelerating heat and mass transfer is achieved. The structure can also be used in other diversion equipment and gasification equipment, and has wide application and high utilization rate.

Drawings

FIG. 1 is a partial schematic view of a gasification plant;

FIG. 2 is a schematic side view of a flow directing structure of the present invention;

FIG. 3 is a schematic top view of the flow directing structure of the present invention;

fig. 4 is a schematic view of the flow guide structure of the present invention.

In the figure, 1 is a flow guide structure, 11 is a throwing-shaped disc, 12 is a sharp corner, 13 is an arc-shaped flanging, 14 is a hexagonal contact hole, and 2 is a nozzle structure.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

A disc-shaped throwing-hole-shaped flow guide structure in gasification equipment is shown in figures 2-4 and comprises a throwing-shaped disc 11, wherein a raised sharp corner 12 is arranged at the center of the throwing-shaped disc 11, the edge of the throwing-shaped disc 11 is turned upwards to form an arc-shaped flanging 13, and a plurality of hexagonal contact holes 14 are formed in the throwing-shaped disc 11; when in work, the bottom of the throwing disc 1 is tangent to the liquid level. The flow guide structure is applied to gasification equipment shown in figure 1 (the whole equipment is distributed in a vertical structure, a furnace is divided into an upper part and a lower part, an upper part coil (not shown in the figure) is coiled around a combustion chamber, the lower part is immersed in water for preheating, flue gas after combustion in the combustion chamber is sprayed out from a nozzle, and sprayed high-temperature flue gas is sprayed onto a throwing disc), and as hexagonal contact holes 14 are distributed on the surface of the flow guide structure, the sprayed flue gas can be well contacted with the water surface of a bottom water pool, so that gasification is increased, heat exchange is enhanced, and then the high-temperature water flue gas enters the upper part circular coil upwards again under the drainage of the throwing disc for condensation and heat exchange; the gasification furnace has the characteristics of increasing the contact area, fully reacting gas and liquid and reducing energy consumption, thereby enhancing heat and mass transfer and improving the gasification efficiency. And this novel poroid water conservancy diversion structure can set up different apertures on its surface, the air vent of different shapes, the speed of gasification degree is felt to the big or small quantity shape of air vent, thereby artificial gasification in carrying out certain degree according to the demand that the natural gas need be heated, the speed of regulation and control heating natural gas, fine energy saving, raise the efficiency.

Preferably, the hexagonal contact holes 14 are distributed on a plurality of circumferences centered on the center of the parabolic disk 11 to form a multi-turn contact hole group. It is further preferred that the hexagonal contact holes 14 of each contact hole group are evenly distributed along the circumference. And the size of the hexagonal contact hole 14 of the outer ring contact hole group is larger than that of the hexagonal contact hole 14 of the inner ring contact hole group. In this embodiment, the plurality of hexagonal contact holes 14 form two contact hole sets, the hexagonal contact holes 14 of the two contact hole sets have different side length ratios according to different ejection speeds at the nozzle, and the optimal selection is 1.1-1.25: 1. This is because the velocity of the flue gas ejected from the nozzle is as high as 33m/s, and is high temperature, and is considered as an incompressible fluid flowing in a turbulent manner, and the difference of the aperture diameters of the openings is too large, so that the flow guiding effect is lost. The distance between the center of the hexagonal contact hole 14 of the outer ring contact hole group and the center of the polishing disc 11 is 1.5-1.7 times of the distance between the center of the hexagonal contact hole 14 of the inner ring contact hole group and the center of the polishing disc 11. Preferably, this value is 1.6. Thus, the flow guide effect of the disc structure can be ensured, and the best gasification effect can be ensured. In this embodiment, the distance between the center of the hexagonal contact hole 14 of the inner ring contact hole group and the center of the parabolic disk 11 is 150mm, and the distance between the center of the hexagonal contact hole 14 of the outer ring contact hole group and the center of the parabolic disk 11 is 240 mm.

Preferably, hexagonal contact hole 14 is a regular hexagonal contact hole, and one side of hexagonal contact hole 14 faces the center of throwing disk 11. A plane part is arranged between a sharp corner 12 and an arc flanging 13 on the parabolic disc 11, and hexagonal contact holes 14 are distributed on the plane part. The number of the inner ring contact holes is preferably 8-9, the number of the outer ring contact holes is 11-12, in the embodiment, 9 hexagonal contact holes 14 are distributed in the inner ring contact hole group, 12 hexagonal contact holes 14 are distributed in the outer ring contact hole group, the side length of the hexagonal contact holes 14 in the inner ring is 25.1mm, and the side length of the hexagonal contact holes 14 in the outer ring is 28.72 mm. The place where the arc-shaped flanging is not provided with the opening, the opening rate of the plane part of the throwing-shaped disc 11 can be 35-45%, and the opening rate is about 39% in the embodiment. In the calculation of the invention, the speed of the high-temperature flue gas sprayed from the nozzle can reach 33m/s, the temperature is about 1200K, the sprayed flue gas is regarded as incompressible fluid flowing in a turbulent way, the high-temperature flue gas is sprayed to the bottom water pool, and water of the high-temperature flue gas needs to be gasified, so that the throw-type disc structure is very important, the proportion of the opening ratio on the gasification structure is about 40%, the sprayed flue gas is favorably and fully contacted with the water at the bottom of the disc, the original non-opening hole is unlikely to have such high gasification rate, if the opening ratio of the disc is continuously increased, the whole disc structure is very weak, the high-speed and high-temperature flue gas cannot be borne, the diversion effect is weakened, and the heat exchange efficiency is reduced on the contrary.

Preferably, the top end of the sharp corner 12 is an acute angle, and the angles increase downwards in sequence and are pointed; the acute angle of the top end of the sharp corner is 30-35 degrees. When the closed angle number of degrees is too small, the flue gas that comes down to spraying is difficult for playing better water conservancy diversion effect to when the flue gas that comes that sprays at a high speed contacts the disc, arouse splashing of disc, gasification that can not be fine, when the angle is too big, can form the resistance to the flue gas, messenger's flue gas that can not be fine contacts the liquid level, thereby reduces the gasification rate. The main acting forces of the flue gas flow are gravity and inertia force, and the optimal solution of the angle is obtained by the gradient design calculation of the maximum flow velocity sprayed by the nozzle and the experimental flow velocity.

After the hexagonal contact hole 14 is added to the structure, the gasification rate of liquid to be gasified is greatly improved, and compared with a polishing type disc without holes, the gasification rate is increased by 10% -15%, so that the utilization of energy is greatly improved, the energy consumption is reduced, and the method has important significance.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.

Claims

1. A disc-shaped throwing hole-shaped flow guide structure in gasification equipment is characterized by comprising a throwing disc (11), wherein a raised sharp corner (12) is arranged at the center of the throwing disc (11), the edge of the throwing disc is turned outwards upwards to form an arc-shaped flanging (13), and a plurality of hexagonal contact holes (14) are formed in the throwing disc (11); when the device works, the bottom of the throwing disc (11) is tangent to the liquid level;

the hexagonal contact holes (14) are distributed on a plurality of circumferences taking the center of the parabolic disc (11) as the center of a circle to form a plurality of circles of contact hole groups;

a plane part is arranged between a sharp corner (12) on the throwing disc (11) and the arc-shaped flanging (13), and the hexagonal contact holes (14) are distributed on the plane part;

the hexagonal contact holes (14) of each circle of contact hole group are uniformly distributed along the circumference;

the size of the hexagonal contact hole (14) of the outer ring contact hole group is larger than that of the hexagonal contact hole (14) of the inner ring contact hole group;

the plurality of hexagonal contact holes (14) form two circles of contact hole groups, and the side length ratio of the hexagonal contact holes (14) of the two circles of contact hole groups is 1.1-1.25: 1;

the distance between the center of the hexagonal contact hole (14) of the outer ring contact hole group and the center of the polishing disc (11) is 1.5-1.7 times of the distance between the center of the hexagonal contact hole (14) of the inner ring contact hole group and the center of the polishing disc (11).

2. The internal disk polishing-shaped flow guiding structure of a gasification device as recited in claim 1, characterized in that the hexagonal contact hole (14) is a regular hexagonal contact hole, and one side of the hexagonal contact hole (14) faces to the center of the polishing-shaped disk (11).

3. The internal disc-shaped polished hole-shaped flow guide structure of a gasification device according to claim 1, wherein the aperture ratio of the plane part of the polished disc (11) is 35-45%.

4. The internal disc-shaped throwing hole-shaped flow guide structure of the gasification equipment as claimed in claim 1, wherein the top end of the sharp corner (12) is an acute angle, and the angles increase downwards in sequence and are in a sharp-pointed shape; the size of the acute angle of the top end of the sharp angle (12) is 30-35 degrees.