CN218972679U - Incinerator and marine natural gas incineration device - Google Patents

Abstract

The utility model provides an incinerator and a marine natural gas incineration device, wherein the incinerator is provided with a first furnace wall, a second furnace wall, a third furnace wall and a cyclone element, the first furnace wall is enclosed to form a combustion chamber, the first furnace wall is provided with a first ventilation opening and a second ventilation opening, the first ventilation opening is connected with the upper part of the combustion chamber, and the second ventilation opening is communicated with the lower part of the combustion chamber; the second furnace wall is sleeved outside the first furnace wall, the upper part of the second furnace wall is provided with a cooling air inlet, the second furnace wall and the first furnace wall are enclosed to form a first ventilation chamber, and the first ventilation chamber is respectively communicated with the cooling air inlet, the first ventilation opening and the second ventilation opening; the third furnace wall is arranged in the second furnace wall and is positioned at the lower part of the combustion chamber, a second air ventilation chamber is formed between the third furnace wall and the first furnace wall, and the second air ventilation chamber is communicated with the second air ventilation opening; the cyclone piece is arranged in the second furnace wall and corresponds to the first ventilation opening. The utility model can realize the uniformity of mixing the cooling air and the flue gas in a limited mixing space.

Description

Incinerator and marine natural gas incineration device

Technical Field

The present utility model relates generally to the technical field of environmental protection equipment, and more particularly to an incinerator and a marine natural gas incineration device.

Background

LNG carrier/fill vessels will have excess Boil Off Gas (BOG) and inert gas containing Boil off gas during sailing, filling and filling, and will need to be handled. For the excessive evaporation gas and the evaporation gas containing inert gas, a natural gas incineration device is adopted for treatment at present. The natural gas incineration device generally directly combusts and cools the evaporated gas and then discharges the evaporated gas, so that the evaporated gas is prevented from being directly discharged to the atmosphere to aggravate the greenhouse effect.

According to the related requirements, the temperature of the flue gas discharged by the natural gas incineration device needs to be controlled below 450 ℃, and more strict requirements are that the temperature is controlled below 250 ℃. Cooling air is usually mixed with high-temperature flue gas and then discharged.

In the related art, the temperature distribution is generally uneven after the cooling wind is mixed with the high-temperature flue gas. If it is desired to achieve a smoke discharge temperature lower than the predetermined discharge temperature, there are two main modes: (1) The size of the equipment mixing space along the height direction is increased, and the temperature uniformity is improved; (2) The radial size of the hearth is increased, and the cooling air quantity is increased, so that the highest temperature of the flue gas is lower than the specified discharge temperature. Both of these approaches increase the size of the device and increase the cost of the device.

Accordingly, there is a need to provide an incinerator and a marine natural gas incineration device to at least partially solve the above-mentioned problems.

Disclosure of Invention

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, a first aspect of the present utility model provides an incinerator for a marine natural gas incineration device, the incinerator having:

a first furnace wall enclosing a combustion chamber, the first furnace wall having a first vent and a second vent, the first vent being connected to an upper portion of the combustion chamber, the second vent being connected to a lower portion of the combustion chamber;

the second furnace wall is sleeved outside the first furnace wall, a cooling air inlet is formed in the upper portion of the second furnace wall, a first ventilation chamber is formed by enclosing the second furnace wall and the first furnace wall, and the first ventilation chamber is respectively communicated with the cooling air inlet, the first ventilation opening and the second ventilation opening;

the third furnace wall is arranged in the second furnace wall and is positioned at the lower part of the combustion chamber, the upper end of the third furnace wall is lower than the first ventilation opening, a second ventilation chamber is formed between the third furnace wall and the first furnace wall, and the second ventilation chamber is communicated with the second ventilation opening; and

the cyclone piece is arranged in the second furnace wall and corresponds to the first ventilation opening, and the cyclone piece is used for enabling the cooling air flow output by the first ventilation opening to rotate around the center of the cross section of the first furnace wall so as to form cyclone.

According to the incinerator of the first aspect of the utility model, the cooling air is introduced into the combustion chamber in two ways, wherein one way is from the first ventilation chamber to the upper part of the combustion chamber through the first ventilation opening, and the other way is from the first ventilation chamber to the lower part of the combustion chamber through the second ventilation opening and the second ventilation opening, so that flue gas formed in the third furnace wall can be mixed with the two cooling air successively in the upward moving process, and the temperature of the flue gas is cooled. Meanwhile, by arranging the cyclone element at the position corresponding to the first ventilation opening in the combustion chamber, cooling air can rotate around the center of the cross section of the first furnace wall after entering the combustion chamber through the first ventilation opening, so that the residence time of the cooling air in the combustion chamber can be prolonged, the contact area of the cooling air and smoke can be increased, the uniformity of the cooling air and the smoke after being mixed is improved, and the purpose of reliably and uniformly cooling the smoke is achieved. By adopting the scheme of the utility model, the purpose of reliably and uniformly cooling the flue gas is realized, and the dimension of the incinerator along the height direction and the radial direction is not required to be increased, so that the production cost of the incinerator is facilitated to be stabilized.

Optionally, the cyclone has:

the first cyclone piece is located the combustion chamber and corresponds the setting with first vent, the first cyclone piece has first swirl vane, first swirl vane is connected to first oven and to the center of the cross section of first oven extends, the extending direction of first swirl vane is inclined in the radial of first oven, first swirl vane is followed the circumference interval setting of first oven.

Optionally, a radial distance between the free ends of the first swirl vanes and the first furnace wall is smaller than a radial distance between the third furnace wall and the first furnace wall.

Optionally, the cyclone further has:

the second cyclone piece, the cyclone piece is located the combustion chamber and is located the top of first cyclone piece, the second cyclone piece has second whirl blade, the upper edge of second whirl blade is located the low reaches of second whirl blade's lower limb along the flow direction of whirl, the radial extreme of second whirl blade is less than the radial extreme of second whirl blade, the second whirl blade is followed the circumference interval setting of first oven.

Optionally, the second cyclone further has:

connecting members corresponding to the center of the cross section of the first furnace wall, the connecting members being respectively connected to radially innermost ends of the respective second swirl vanes; and

and an annular member located outside the connecting member and connected to a radially outermost end of the second swirl blades and the first furnace wall, respectively.

Optionally, a radially innermost end of the second swirl vane is located downstream of a radially outermost end of the second swirl vane in a flow direction of the swirl.

Optionally, the cross section of the first furnace wall is circular, and the direction of the cooling air inlet is deviated from the center of the cross section of the first furnace wall.

Optionally, the incinerator further has:

and the cooling fans are positioned outside the second furnace wall and connected to the cooling air inlets so as to respectively provide cooling air flows to the first ventilation chambers through the cooling air inlets.

Optionally, at least two first ventilation openings are arranged at intervals along the circumferential direction of the first furnace wall, and at least part of the first swirl vanes are respectively arranged in one-to-one correspondence with at least part of the first ventilation openings.

Optionally, in a radial direction of the first furnace wall, a projection of the first swirl vanes at the first ventilation opening at the first furnace wall at least partially covers the first ventilation opening.

Optionally, at least two second ventilation openings are arranged, and at least two second ventilation openings are arranged at intervals along the circumferential direction of the first furnace wall.

A second aspect of the present utility model provides a marine natural gas incineration device, the marine natural gas incineration device having:

the incinerator according to the above;

a burner connected to a lower portion of the incinerator for burning a combustible gas located in a combustion chamber; and

and the fan assembly is connected to the lower part of the incinerator and is used for blowing air into the combustion chamber.

According to the marine natural gas incineration apparatus of the second aspect of the present utility model, by applying the above-described incinerator, it is possible to uniformly cool the flue gas generated by the combustion of the burner in the incinerator without increasing the size of the inside of the incinerator in the radial and height directions, thereby contributing to reliable control of the exhaust gas temperature and stabilization of the equipment cost.

Drawings

The following drawings of embodiments of the present utility model are included as part of the utility model. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

fig. 1 is a front view of a marine natural gas incineration device according to a preferred embodiment of the present utility model;

FIG. 2 is a top view of the marine natural gas incineration device shown in FIG. 1;

FIG. 3 is a cross-sectional view of the marine natural gas incineration device shown in FIG. 1;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B in FIG. 3;

FIG. 6 is a side view of the second cyclone shown in FIGS. 2, 3 and 5;

FIG. 7 is a top view of the second cyclone shown in FIG. 6; and

fig. 8 is a perspective view of the second cyclone shown in fig. 6.

Reference numerals illustrate:

100: incinerator 101: first furnace wall

101a: first vent 101b: second ventilation opening

102: combustion chamber 103: second furnace wall

103a: cooling air inlet 104: first ventilation chamber

105: third furnace wall 106: second ventilation chamber

110: swirl member 111: first cyclone part

111a: first swirl vanes 112: second cyclone part

112a: second swirl vanes 112b: connecting component

112c: annular member 130: cooling fan

200: burner 300: fan assembly

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the embodiments of the utility model.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the present utility model. It will be apparent that embodiments of the utility model may be practiced without limitation to the specific details that are set forth by those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model, as the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like are used herein for illustrative purposes only and are not limiting.

Ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".

Hereinafter, specific embodiments of the present utility model will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present utility model and not limit the present utility model.

The utility model aims to solve the problem of equipment size increase caused by poor mixing of flue gas and cooling air and large mixing space requirement.

In order to solve the above technical problems, the present utility model provides an incinerator 100, which is applied to a marine natural gas incinerator, and can achieve efficient mixing of cooling air and flue gas and increase uniformity of flue gas temperature in a limited mixing space. As shown in fig. 1 to 8, the incinerator 100 according to the present utility model has a first furnace wall 101, a second furnace wall 103, a third furnace wall 105, and a cyclone 110. The first furnace wall 101 encloses a combustion chamber 102. The first furnace wall 101 has a first ventilation opening 101a and a second ventilation opening 101b. The first ventilation opening 101a is connected to an upper portion of the combustion chamber 102. The second ventilation port 101b communicates to the lower portion of the combustion chamber 102. The second furnace wall 103 is arranged outside the first furnace wall 101 in a sleeved mode. The second furnace wall 103 has a cooling air inlet 103a in an upper portion thereof. The second furnace wall 103 and the first furnace wall 101 enclose a first ventilation chamber 104. The first ventilation chamber 104 communicates with the cooling air inlet 103a, the first ventilation opening 101a, and the second ventilation opening 101b, respectively. The cooling air flow entering the first ventilation chamber 104 from the cooling air inlet 103a can move from the first ventilation opening 101a and the second ventilation opening 101b, respectively, toward the combustion chamber 102. The third furnace wall 105 is disposed inside the second furnace wall 103 and is located in the lower portion of the combustion chamber 102. The space enclosed by the third furnace wall 105 may be used to limit the extent of the flame when burned. The upper end of the third furnace wall 105 is lower than the first ventilation opening 101a. A second ventilation chamber 106 is formed between the third furnace wall 105 and the first furnace wall 101, and the second ventilation chamber 106 communicates with the second ventilation opening 101b. The cooling air at the second ventilation opening 101b moves upward to the upper side of the third furnace wall 105 via the second ventilation opening 106, and is mixed with the flue gas before the cooling air at the first ventilation opening 101a, so that the primary cooling of the flue gas is realized. Then, the flue gas is mixed with cooling air at the first ventilation opening 101a when passing through the first ventilation opening 101a, so that the flue gas is further cooled. The cyclone 110 is provided inside the second furnace wall 103 and corresponds to the first ventilation opening 101a. The swirl member 110 is for rotating the cooling air flow outputted from the first ventilation opening 101a around the center of the cross section of the first furnace wall 101 to form a swirl flow. By providing the swirl element 110 to form a swirl flow in the combustion chamber 102 corresponding to the first ventilation opening 101a, the flue gas and the cooling air can be rotated and mixed while moving upward together.

According to the incinerator 100 of the present utility model, the cooling air is introduced into the combustion chamber 102 in two ways, one way is from the first ventilation chamber 104 to the upper part of the combustion chamber 102 through the first ventilation opening 101a, and the other way is from the first ventilation chamber 104 to the lower part of the combustion chamber 102 through the second ventilation opening 101b and the second ventilation opening 106, so that the flue gas formed in the third furnace wall 105 can be mixed with the two cooling air in sequence during the upward movement, and the temperature of the flue gas is cooled. Meanwhile, by arranging the swirl element 110 at the position corresponding to the first ventilation opening 101a in the combustion chamber 102, cooling air can rotate around the center of the cross section of the first furnace wall 101 to form swirl after entering the combustion chamber 102 through the first ventilation opening 101a, so that the residence time of the cooling air in the combustion chamber 102 can be prolonged, the contact area of the cooling air and smoke can be increased, the uniformity of the cooling air and the smoke after being mixed is improved, and the purpose of reliably and uniformly cooling the smoke is achieved. By adopting the scheme of the utility model, the purpose of reliably and uniformly cooling the flue gas is realized, and the dimension of the incinerator 100 in the height direction and the radial direction does not need to be increased, so that the production cost of the incinerator 100 is favorably stabilized.

Referring to fig. 2-5, for example, the cross-section of the first furnace wall 101 may be circular. The circular first furnace wall 101 can smoothly guide the flue gas to discharge the flue gas. At the same time, cleaning of the inner wall of the first furnace wall 101 is facilitated.

With continued reference to fig. 2-5, for example, the swirl element 110 may have a first swirl element 111. The first swirl member 111 is located in the combustion chamber 102 and is disposed in correspondence with the first ventilation opening 101a. The first swirl member 111 has first swirl vanes 111a. The first swirl vanes 111a are connected to the first furnace wall 101 and extend towards the centre of the cross section of the first furnace wall 101. The extending direction of the first swirl vanes 111a is inclined to the radial direction of the first furnace wall 101. The first swirl vanes 111a are disposed at intervals along the circumferential direction of the first furnace wall 101. After contacting the first swirl vanes 111a, the wind entering the combustion chamber 102 through the first ventilation openings 101a rotates around the center of the cross section of the first furnace wall 101 under the guidance of the first swirl vanes 111a, thereby forming a rotating air flow. The rotating cooling air flow can be wrapped and clamped with the flue gas to rotate together, so that the residence time of the cooling air flow in the combustion chamber 102 can be prolonged, the contact area of the cooling air and the flue gas can be increased, and further, the flue gas and the cooling air can be mixed more fully. Under the condition that the smoke and the cooling air are mixed more uniformly and sufficiently, the smoke discharging temperature can be controlled more accurately.

Referring to fig. 4 and 5, further, the radial distance between the free ends of the first swirl vanes 111a and the first furnace wall 101 is less than the radial distance between the third furnace wall 105 and the first furnace wall 101. Through such setting, can make the scope of whirl bigger to further improve flue gas and whirl contact's area, and then improve cooling efficiency.

Referring to fig. 2 and 3, and fig. 5 to 8, the cyclone 110 may further have a second cyclone 112. Swirl element 110 is located in combustion chamber 102 and above first swirl element 111. The second swirl member 112 has second swirl vanes 112a. The upper edge of the second swirl vane 112a is located downstream of the lower edge of the second swirl vane 112a in the direction of swirl flow. The flow direction of the swirling flow here may be a circumferential flow direction because the swirling flow is moved upward while rotating. The radially outermost end of the second swirl vanes 112a is lower than the radially innermost end of the second swirl vanes 112a. The second swirl vanes 112a are disposed at intervals along the circumferential direction of the first furnace wall 101. The second swirl element 112 is generally tapered, with the cross-section of the second swirl element 112 decreasing from bottom to top. By arranging the second cyclone 112 above the first cyclone 111, the cyclone effect can be further improved, so that the flue gas and the cooling air are further fully mixed, and the mixed air flow of the flue gas and the cooling air is more uniform. Meanwhile, the second cyclone 112 can guide the flue gas to the periphery, so that the flue gas in the center is dispersed and mixed with the flue gas around, and the temperature of the discharged flue gas is prevented from being uneven.

Referring to fig. 2 and 3, and fig. 6 to 8, further, the second cyclone 112 may further have a connection member 112b and an annular member 112c. The connecting member 112b corresponds to the center of the cross section of the first furnace wall 101. The connection members 112b are respectively connected to radially innermost ends of the respective second swirl blades 112a. The annular member 112c is located outside the connecting member 112 b. And, annular members 112c are connected to the radially outermost ends of the second swirl blades 112a and the first furnace wall 101, respectively. The radially innermost ends of the second swirl vanes 112a are connected together by the connecting members 112b to help to more fully divert the centrally located flue gas around and improve the uniformity of mixing of the centrally located flue gas with the surrounding flue gas. Is connected to the radially outermost end of the second swirl vanes 112a by an annular member 112c for effecting connection of each second swirl vane 112a to the first furnace wall 101.

In other embodiments of the utility model, the annular member 112c may be removably attached to the first furnace wall 101 to facilitate removal and replacement of the second cyclone 112.

Referring to fig. 3, 6, and 8, for example, the radially innermost end of second swirl vane 112a may be downstream of the radially outermost end of second swirl vane 112a in the direction of the swirl flow. This helps reduce the drag experienced by the swirling flow in passing over the second swirl vanes 112a, and the second swirl vanes 112a may further enhance the swirling flow effect.

Referring to fig. 2 to 5, alternatively, the cooling wind inlet 103a is oriented off-center from the center of the cross-section of the first furnace wall 101. When the air flow outputted from the cooling air inlet 103a reaches each of the first ventilation openings 101a, part of the air flow received by the first ventilation openings 101a may deviate from the radial direction of the first furnace wall 101, thereby being more advantageous in forming a swirl flow.

In the illustrated embodiment, two cooling air inlets 103a are provided, and the two cooling air inlets 103a are provided at equal intervals in the circumferential direction of the first furnace wall 101. That is, the corresponding central angle between the adjacent two cooling air inlets 103a is 180 degrees.

Referring to fig. 1 to 5, the incinerator 100 may further have a cooling fan 130. The cooling fan 130 is located outside the second furnace wall 103. And is connected to the cooling air inlets 103a to supply cooling air flows to the first ventilation chambers 104 through the cooling air inlets 103a, respectively. That is, the cooling air inlet 103a is located in the outer cylinder of the incinerator 100 for connection with the cooling fan 130. The cooling fan 130 is used for feeding cooling air into the incinerator 100

Referring to fig. 3, for example, the first ventilation opening 101a may be provided with at least two. At least two first ventilation openings 101a are provided at intervals along the circumferential direction of the first furnace wall 101. At least part of the first swirl vanes 111a are disposed in one-to-one correspondence with at least part of the first ventilation openings 101a, respectively.

Referring to fig. 2 and 3, optionally, in a radial direction of the first furnace wall 101, a projection of the first swirl vanes 111a located at the first ventilation opening 101a at least partially covers the first ventilation opening 101a on the first furnace wall 101. The purpose of this is to guide the air flow of the first ventilation opening 101a by the first swirl vanes 111a near the surface of the first ventilation opening 101a, thereby forming a swirling air flow.

Referring to fig. 3, for example, the second ventilation opening 101b may be provided with at least two. At least two second ventilation openings 101b are provided at intervals along the circumferential direction of the first furnace wall 101. By arranging the second ventilation openings 101b at intervals along the circumferential direction of the first furnace wall 101, cooling air can be made to enter the combustion chamber 102 from the periphery of the first furnace wall 101 synchronously, so that the cooling air and flue gas can be fully mixed.

Referring to fig. 1 to 8, in the incinerator 100 of the present utility model, the second ventilation port 101b is located at a lower portion of the incinerator 100. Cooling air that enters the first ventilation chamber 104 from the cooling air inlet 103a. A part of the cooling air flows downwards through the second air vent 101b, is guided to the lower part of the combustion chamber 102 through the second air vent chamber 106, and is mixed with the smoke generated by combustion for the first time, so that the primary mixing and cooling of the smoke are realized. The first swirl member 111 of the present utility model has first swirl vanes 111a uniformly distributed in the circumferential direction. The first swirl vanes 111a have a diversion effect on the cooling air, so that the cooling air enters the incinerator 100 in a swirl manner, and secondary mixing and cooling of the flue gas are realized. The second cyclone 112 of the present utility model has second cyclone blades 112a uniformly distributed in the circumferential direction and has a tapered structure. The second cyclone 112 further improves the cyclone effect, and the conical structure is beneficial to guiding the flue gas to the periphery, so that the mixing of the central flue gas and the peripheral flue gas is realized. Three times of mixing and cooling of the flue gas is achieved by the second cyclone 112.

With continued reference to fig. 1-8, the present utility model also provides a marine natural gas incineration device having a burner 200, a fan assembly 300, and an incinerator 100 according to the above. The burner 200 is connected to the lower portion of the incinerator 100. The tip portion of the burner 200 may extend into the combustion chamber 102 and be positioned within the space enclosed by the third furnace wall 105. The burner 200 is used to burn combustible gas located in the combustion chamber 102. A blower assembly 300 is connected to a lower portion of the incinerator 100 for blowing air into the combustion chamber 102. The blower assembly 300 may include several blowers.

According to the marine natural gas incineration apparatus of the present utility model, by applying the above-described incinerator 100, it is possible to uniformly cool the flue gas generated by the combustion of the burner 200 in the incinerator 100, and it is not necessary to increase the size of the inside of the incinerator 100 in the radial and height directions, thereby contributing to reliable control of the exhaust gas temperature and stabilization of the equipment costs. Compared with the prior art, the marine natural gas incineration device provided by the utility model not only can strengthen the mixing of the smoke and the air and improve the cooling rate, but also is beneficial to reducing the size of equipment and improving the compactness of the equipment.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the utility model. Terms such as "disposed" or the like as used herein may refer to either one element being directly attached to another element or one element being attached to another element through an intermediate member. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.

The present utility model has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. Those skilled in the art will appreciate that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed.

Claims (12)

1. An incinerator for a marine natural gas incineration device, characterized in that the incinerator has:

a first furnace wall enclosing a combustion chamber, the first furnace wall having a first vent and a second vent, the first vent being connected to an upper portion of the combustion chamber, the second vent being connected to a lower portion of the combustion chamber;

the second furnace wall is sleeved outside the first furnace wall, a cooling air inlet is formed in the upper portion of the second furnace wall, a first ventilation chamber is formed by enclosing the second furnace wall and the first furnace wall, and the first ventilation chamber is respectively communicated with the cooling air inlet, the first ventilation opening and the second ventilation opening;

the third furnace wall is arranged in the second furnace wall and is positioned at the lower part of the combustion chamber, the upper end of the third furnace wall is lower than the first ventilation opening, a second ventilation chamber is formed between the third furnace wall and the first furnace wall, and the second ventilation chamber is communicated with the second ventilation opening; and

the cyclone piece is arranged in the second furnace wall and corresponds to the first ventilation opening, and the cyclone piece is used for enabling the cooling air flow output by the first ventilation opening to rotate around the center of the cross section of the first furnace wall so as to form cyclone.

2. The incinerator according to claim 1, characterized in that said swirl element has:

the first cyclone piece is located the combustion chamber and corresponds the setting with first vent, the first cyclone piece has first swirl vane, first swirl vane is connected to first oven and to the center of the cross section of first oven extends, the extending direction of first swirl vane is inclined in the radial of first oven, first swirl vane is followed the circumference interval setting of first oven.

3. The incinerator according to claim 2, wherein the radial distance between the free ends of the first swirl vanes and the first furnace wall is smaller than the radial distance between the third furnace wall and the first furnace wall.

4. A burner according to claim 2 or 3, wherein the swirl element further has:

the second cyclone piece, the cyclone piece is located the combustion chamber and is located the top of first cyclone piece, the second cyclone piece has second whirl blade, the upper edge of second whirl blade is located the low reaches of second whirl blade's lower limb along the flow direction of whirl, the radial extreme of second whirl blade is less than the radial extreme of second whirl blade, the second whirl blade is followed the circumference interval setting of first oven.

5. The incinerator according to claim 4, characterized in that,

the second cyclone also has:

connecting members corresponding to the center of the cross section of the first furnace wall, the connecting members being respectively connected to radially innermost ends of the respective second swirl vanes; and

and an annular member located outside the connecting member and connected to a radially outermost end of the second swirl blades and the first furnace wall, respectively.

6. The incinerator according to claim 4, characterized in that,

the radially innermost end of the second swirl vane is downstream of the radially outermost end of the second swirl vane in the direction of flow of the swirl.

7. The incinerator according to claim 1, wherein the cross section of the first furnace wall is circular, and the orientation of the cooling air inlet is offset from the centre of the cross section of the first furnace wall.

8. The incinerator according to claim 1, characterized in that the incinerator further has:

and the cooling fans are positioned outside the second furnace wall and connected to the cooling air inlets so as to respectively provide cooling air flows to the first ventilation chambers through the cooling air inlets.

9. An incinerator according to claim 2 or claim 3, wherein at least two of said first ventilation openings are provided, at least two of said first ventilation openings being spaced apart along the circumference of said first furnace wall, at least part of said first swirl vanes being provided in one-to-one correspondence with at least part of said first ventilation openings, respectively.

10. The incinerator according to claim 9, wherein in a radial direction of the first furnace wall, a projection of the first swirl vanes at the first ventilation opening at the first furnace wall at least partially covers the first ventilation opening.

11. The incinerator according to claim 1, wherein at least two of the second ventilation openings are provided, and at least two of the second ventilation openings are provided at intervals along the circumferential direction of the first furnace wall.

12. A marine natural gas incineration device, characterized in that it has:

the incinerator according to any one of claims 1 to 11;

a burner connected to a lower portion of the incinerator for burning a combustible gas located in a combustion chamber; and

and the fan assembly is connected to the lower part of the incinerator and is used for blowing air into the combustion chamber.

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