CN217503691U

CN217503691U - Variable cross section integration waste liquid incineration boiler

Info

Publication number: CN217503691U
Application number: CN202220884548.7U
Authority: CN
Inventors: 张跟东
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-09-27
Anticipated expiration: 2032-04-15

Abstract

The utility model provides a variable cross section integration waste liquid burns boiler, including boiler body, boiler body is inside to be equipped with the endothermic cavity, connection cavity and the burning cavity that from top to bottom communicate in proper order, and wherein the cross-sectional area of endothermic cavity is greater than the cross-sectional area of burning cavity, and the cross-sectional area of burning cavity is greater than the cross-sectional area of connection cavity. Be equipped with the connection nest of tubes on the inside wall of connecting the cavity, connection nest of tubes includes a plurality of connecting line and a plurality of arc arched tube, and the lateral wall of connecting line is laminated mutually with the inside wall of being connected the cavity, and inside the cavity was connected to the arc top orientation of arc arched tube, and formed the circulation passageway between the arc arched tube that lies in on the relative two inside walls of connection cavity. And a combustion-supporting assembly and a liquid spraying assembly are also arranged on the inner side wall of the combustion cavity, and the liquid spraying assembly is positioned above the combustion-supporting assembly. The utility model discloses can reduce auxiliary fuel's quantity, improve the rate of destruction of harmful substance in the waste liquid to promote waste liquid incineration boiler's heat utilization efficiency and thermal efficiency.

Description

Variable cross section integration waste liquid incineration boiler

Technical Field

The utility model belongs to the technical field of the waste liquid treatment, especially, relate to a variable cross section integration waste liquid burns boiler.

Background

In the process of industrial production, waste liquid is inevitably generated, the waste liquid contains a large amount of organic pollutants, and if the waste liquid is directly discharged into a water body, the ecological environment of the water body and the life of downstream residents are greatly harmed, so that the waste liquid needs to be purified before being discharged.

In the prior art, the waste liquid treatment method mainly comprises the following steps: physical methods, chemical methods, biochemical methods, membrane methods, osmosis methods, crystallization methods, high-temperature incineration oxidation methods and the like, and the high-temperature incineration oxidation methods have higher economic benefits and can more thoroughly remove pollutants in waste liquid, so the method is widely applied.

However, the conventional waste liquid incineration boiler has low thermal efficiency, and requires a large amount of auxiliary fuel when burning low-calorific-value waste liquid, which increases the operation cost of the apparatus, thereby reducing the economic efficiency of waste liquid treatment. In addition, the heat flow distribution of the inside burning of traditional waste liquid incineration boiler is inhomogeneous, appears the insufficient condition of burning easily when carrying out the waste liquid treatment, will produce this moment if poisonous intermediate product such as carbon monoxide, and then the tail gas that leads to the boiler does not conform to emission standard.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a variable cross section integration waste liquid incineration boiler to solve above-mentioned technical problem.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a variable-section integrated waste liquid incineration boiler comprises a boiler body, wherein a heat absorption cavity, a connecting cavity and a combustion cavity which are sequentially communicated from top to bottom are arranged in the boiler body, the cross-sectional area of the heat absorption cavity is larger than that of the combustion cavity, and the cross-sectional area of the combustion cavity is larger than that of the connecting cavity; a first membrane water-cooling wall is arranged on the inner side wall of the heat absorption cavity, a second membrane water-cooling wall is arranged on the inner side wall of the combustion cavity, a connecting pipe group is arranged on the inner side wall of the connecting cavity, and the first membrane water-cooling wall is communicated with the second membrane water-cooling wall through the connecting pipe group; the connecting pipe group comprises a plurality of connecting pipelines and a plurality of arc-shaped arch pipes, the outer side walls of the connecting pipelines are attached to the inner side walls of the connecting cavity, the arc tops of the arc-shaped arch pipes face the inside of the connecting cavity, and a circulation channel is formed between the arc-shaped arch pipes on the two opposite inner side walls of the connecting cavity; still be equipped with combustion-supporting subassembly and hydrojet subassembly on the burning cavity inside wall, combustion-supporting subassembly includes one-level air distribution tuyere and the combustion-supporting mouth of one-level, and the hydrojet subassembly includes: the secondary air distribution blast nozzle, the secondary combustion-supporting opening and the waste liquid nozzle, and the liquid spraying component is positioned above the combustion-supporting component.

Furthermore, the connecting cavity comprises a first conical section and a second conical section, the large end opening of the first conical section is communicated with the heat absorption cavity, the large end opening of the second conical section is communicated with the combustion cavity, and the small end opening of the first conical section is communicated with the small end opening of the second conical section.

Furthermore, the spray assembly is a plurality of spray assemblies, and the spray assemblies are uniformly arranged along the height direction of the combustion cavity.

Further, the plurality of arc-shaped arch pipes and the plurality of connecting pipelines are alternately arranged one by one.

Furthermore, the cross section of the combustion cavity is square, and the liquid spraying assembly is arranged at a corner formed by two adjacent side walls of the combustion cavity.

Furthermore, a high-temperature-resistant chromium ore sand pouring layer is arranged on the inner side wall of the combustion cavity.

Furthermore, a circulating chute and a cooling interlayer channel are arranged on the inner wall of the bottom of the combustion cavity.

Further, the variable cross-section integrated waste liquid incineration boiler comprises a waste heat recovery assembly, the waste heat recovery assembly comprises a connecting channel, a steering chamber and a plate heat exchanger which are sequentially communicated, the air inlet end of the connecting channel is communicated with the heat absorption cavity, and the air outlet end of the plate heat exchanger is communicated with the rapid cooling heat exchanger; a screen type tube bank and a third membrane type water-cooled wall are arranged in the connecting channel, and an ash collecting hopper is arranged at the bottom of the connecting channel.

Furthermore, the top of the heat absorption cavity is provided with a close-packed heat absorption tube panel.

Compared with the prior art, a variable cross section integration waste liquid incineration boiler have following advantage:

(1) a variable cross section integration waste liquid incineration boiler, the cross-sectional area of its heat absorption cavity is greater than the cross-sectional area of burning cavity, compares with prior art, the less burning cavity of cross-sectional area can reduce waste liquid incineration boiler's auxiliary fuel quantity to improve waste liquid treatment's economic benefits. Meanwhile, the heat absorption cavity with the larger cross section area has a larger heat exchange area, so that the heat absorption efficiency of the waste liquid incineration boiler can be improved, and the heat utilization rate of waste liquid incineration is improved.

(2) A variable cross section integration waste liquid incineration boiler, the cross-sectional area of its connection cavity is less than the cross-sectional area of burning cavity. When the heat-absorbing cavity works, the connecting cavity with the smaller cross section area can reduce the heat transfer speed between the combustion cavity and the heat-absorbing cavity, so that the waste liquid incineration temperature in the combustion cavity is increased, harmful gas is burnt out, and toxic intermediate products are avoided. Secondly, be equipped with the arc hunch pipe in connecting the cavity inside, compare with connecting line, the arc hunch pipe can not only further reduce the heat transfer speed between burning cavity and the heat absorption cavity, can also improve the heat transfer area of connecting the nest of tubes to further improve the heat absorption utilization efficiency of this device. In addition, when the phenomenon of ash falling occurs in the heat absorption cavity, the connecting cavity with the smaller cross section area and the arc-shaped arch pipe can shield the combustion cavity to a certain degree, so that the phenomenon that the bottom molten material splashes due to the impact of the falling ash is avoided.

(3) A variable cross section integration waste liquid incineration boiler, at the inside a plurality of hydrojet subassemblies that are equipped with of burning cavity, compare with traditional waste liquid incineration boiler, a plurality of hydrojet subassemblies enable the even distribution of waste liquid inside the burning cavity to improve the effect of burning of waste liquid. In addition, when the cross section of burning cavity was the square, the hydrojet subassembly can set up in the corner that the adjacent both sides wall of burning cavity formed, arranges through the aforesaid and can avoid waste liquid nozzle spun waste liquid to spray on waste liquid incineration boiler inner wall to improve the even effect that waste liquid distributes on the burning cavity cross-section, avoid taking place the wall built-up trickling phenomenon.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic structural view of a variable cross-section integrated waste liquid incineration boiler according to an embodiment of the present invention;

fig. 2 is a schematic sectional view of a region where the connection cavity according to an embodiment of the present invention is located;

FIG. 3 is a cross-sectional view of a combustion cavity (along the location of the waste nozzle) in accordance with an embodiment of the present invention;

fig. 4 is a cross-sectional view of a combustion cavity (along the location of the combustion assembly) according to an embodiment of the present invention.

Description of reference numerals:

1-a boiler body; 11-a heat-absorbing cavity; 12-a connecting cavity; 13-a combustion cavity; 21-a first membrane water wall; 22-a second membrane water wall; 31-connecting lines; 32-arc arch pipe; 41-first-level air distribution blast nozzle; 42-first-stage combustion-supporting port; 51-secondary air distribution blast nozzle; 52-secondary combustion-supporting port; 53-waste liquid nozzle; 6-high temperature resistant chromium ore sand casting layer; 71-a circulation chute; 72-cooling the sandwich channel; 81-connecting the channels; 811-panel tube rows; 812-a dust hopper; 82-a turn-around chamber; 83-plate heat exchanger; 9-closely-arranged heat-absorbing tube panel.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The utility model provides a variable cross section integration waste liquid incineration boiler for contain the salt waste liquid to high concentration and burn oxidation treatment, figure 1 is in this embodiment variable cross section integration waste liquid incineration boiler's schematic structure drawing, as shown in the figure, variable cross section integration waste liquid incineration boiler includes boiler body 1, is equipped with the heat absorption cavity 11 that from top to bottom communicates in proper order, connects cavity 12 and burning cavity 13 in boiler body 1 inside. When the waste liquid incinerator is used, waste liquid to be treated is subjected to high-temperature incineration and oxidation inside the combustion cavity 13, smoke generated by incineration is transferred to the inside of the heat absorption cavity 11 through the connecting cavity 12, and therefore heat generated by incineration can be recovered by the heat absorption cavity 11.

Since inorganic pollutants in the waste liquid form molten products after high-temperature incineration, a circulation chute 71 should be provided at the bottom of the combustion cavity 13 to collect the molten products. Correspondingly, a cooling sandwich channel 72 is also provided at the bottom of the combustion cavity 13 to cool the molten product, so as to ensure that the burned product is smoothly solidified and discharged.

Correspondingly, in order to facilitate the heat absorption cavity 11 to recover the waste heat in the flue gas, the top of the heat absorption cavity 11 of the device is provided with a close-packed heat absorption tube panel 9. Specifically, the close-packed heat-absorbing tube panel 9 should include a plurality of closely-arranged tube sheets, and heat-absorbing media such as water should be injected into the tube sheets. When the flue gas exchanges heat with the close-packed heat absorption tube panels 9, the close-packed heat absorption tube panels 9 can absorb heat inside the flue gas, so that a heat absorption medium is subjected to phase change, and finally a large amount of saturated steam is generated to be supplied to other equipment in a production workshop for use.

As an optional implementation manner of this embodiment, in order to facilitate the judgment of the incineration condition inside the boiler body 1 by the staff, a temperature measuring hole and a pressure measuring hole should be respectively disposed on the side walls of the heat absorption cavity 11 and the combustion cavity 13, and correspondingly, a temperature measuring instrument and a pressure measuring instrument should be respectively disposed inside the temperature measuring hole and the pressure measuring hole. When using, the staff can judge the operating condition of boiler body 1 inside according to temperature measuring instrument and pressure measurement instrument's registration to in time the adjustment is like operating parameters such as auxiliary fuel quantity, waste liquid input and flue gas emission. Correspondingly, still should be equipped with the supplementary trompil of common boiler such as soot blowing hole and inspection door on boiler body 1's lateral wall, and then make things convenient for the staff to overhaul the boiler and maintain in the in-service use process.

For avoiding the tail gas that boiler body 1 produced to cause the pollution to atmospheric environment, improve the heat utilization efficiency of this device simultaneously, this embodiment variable cross section integration waste liquid incineration boiler can include the waste heat recovery subassembly. Specifically, the waste heat recovery assembly comprises a connecting channel 81, a turning chamber 82 and a plate heat exchanger 83 which are sequentially communicated, wherein the air inlet end of the connecting channel 81 is communicated with the heat absorption cavity 11, and the air outlet end of the plate heat exchanger 83 is communicated with the rapid cooling heat exchanger. Be equipped with screen tube bank 811 and third membrane wall at interface channel 81, after tail gas left boiler body 1 and got into the waste heat recovery subassembly, screen tube bank 811 will absorb the waste heat in the tail gas, and the third membrane wall will protect the waste heat recovery subassembly to avoid this device to take place heat loss.

In addition, since the exhaust gas entering the interior of the heat recovery module inevitably contains dust, a dust collecting hopper 812 may be further provided at the bottom of the connection passage 81. When the exhaust gas exchanges heat with the screen rows 811 inside the connecting channel 81, dust inside the exhaust gas adheres to the outer walls of the screen rows 811 and the inner walls of the connecting channel 81, and finally falls into the dust hopper 812 by gravity and the action of a soot blower (not shown).

In the prior art, the traditional waste liquid incineration boiler has low thermal efficiency, needs to use a large amount of auxiliary fuel to provide heat energy, has poor burnout effect of waste liquid, and is easy to generate toxic intermediate products. To solve this problem, the heat-absorbing cavity 11 in the present embodiment has a cross-sectional area larger than that of the combustion cavity 13, and the combustion cavity 13 has a cross-sectional area larger than that of the connecting cavity 12. When the waste liquid is incinerated at a high temperature inside the combustion cavity 13, the temperature required for waste liquid treatment can be rapidly reached due to the small cross-sectional area of the combustion cavity 13, thereby reducing the amount of auxiliary fuel used in the waste liquid incineration boiler. Meanwhile, as the cross-sectional area of the connecting cavity 12 is smaller than that of the combustion cavity 13, the heat transfer speed between the combustion cavity 13 and the heat absorption cavity 11 is reduced, so that the inside of the combustion cavity 13 can be kept at a higher temperature, the waste liquid is thoroughly incinerated and oxidized, and the waste liquid is prevented from generating toxic intermediate products due to insufficient combustion.

Optionally, to facilitate limiting the heat transfer rate between the combustion cavity 13 and the heat absorption cavity 11, the connecting cavity 12 may include a first tapered section and a second tapered section, wherein a large end opening of the first tapered section is communicated with the heat absorption cavity 11, a large end opening of the second tapered section is communicated with the combustion cavity 13, and a small end opening of the first tapered section is communicated with a small end opening of the second tapered section. When the inside flue gas upward movement that produces of combustion cavity 13, second toper section can be gathered together combustion cavity 13's open-top to reduce the rising speed of flue gas, after the flue gas got into first toper section, first toper section enabled the flue gas to the inside even diffusion of heat absorption cavity 11, thereby made things convenient for heat absorption cavity 11 to absorb the heat that the flue gas carried, improved the heat utilization ratio of this device.

In addition, because the cross-sectional area of the connecting cavity 12 is small, when the dust falling phenomenon occurs inside the heat absorption cavity 11, the side wall of the connecting cavity 12 can block the falling dust to a certain extent, so that the furnace bottom melt inside the combustion cavity 13 can be prevented from splashing due to the falling dust, and equipment such as a burner and the like installed on the inner wall of the boiler body 1 can be protected.

In order to facilitate the recycling of heat of the device, a first membrane water-cooling wall 21 is arranged on the inner side wall of the heat absorption cavity 11, and a second membrane water-cooling wall 22 is arranged on the inner side wall of the combustion cavity 13. In order to realize the circulation of the heat exchange medium between the first membrane water-cooling wall 21 and the second membrane water-cooling wall 22, a connecting pipe group is arranged on the inner side wall of the connecting cavity 12. During construction, the first membrane water wall 21 and the second membrane water wall 22 should be communicated through a connection pipe set. In addition, an ascending pipe system and a descending pipe system (not shown in the figure) should be arranged outside the boiler body 1, and a heat exchange medium can be circulated among the first membrane water wall 21, the connecting pipe group and the second membrane water wall 22 through the ascending pipe system and the descending pipe system, so that a full heat exchange circulation process of waste liquid combustion, heat absorption and saturated steam generation is realized.

It should be noted that, in this embodiment, the first membrane water wall 21, the second membrane water wall 22, and the third membrane water wall may be formed by processing membrane tube panels. When construction is carried out, working personnel should carry out reliable welding between the diaphragm type tube panels that communicate each other to avoid heat transfer medium to take place to leak.

Fig. 2 is a sectional view of the boiler body 1 at the connection cavity 12, and as shown in the figure, the connection pipe group in this embodiment may include a plurality of connection pipes 31 and a plurality of arc-shaped arch pipes 32, wherein the outer side walls of the connection pipes 31 are attached to the inner side walls of the connection cavity 12, the arc tops of the arc-shaped arch pipes 32 face the inside of the connection cavity 12, and a communication channel is formed between the arc-shaped arch pipes 32 located on the two opposite inner side walls of the connection cavity 12.

Since the arc top of the arc-shaped arch tube 32 faces the inside of the connecting cavity 12, when the flue gas moves from the combustion cavity 13 to the inside of the heat absorption cavity 11, the arc-shaped arch tube 32 can block the flue gas, thereby further reducing the heat transfer speed between the combustion cavity 13 and the heat absorption cavity 11. Meanwhile, the side wall of the arc-shaped arch pipe 32 can also block falling dust to a certain degree, so that the dust falling blocking effect of the device is enhanced. In addition, when the flue gas entered the connection cavity 12, because the heat transfer area of arc arch pipe 32 is greater than the heat transfer area of connecting line 31, consequently set up arc arch pipe 32 and can also improve thermal absorption effect to further promote this device's heat utilization efficiency.

Alternatively, when the pipes inside the connection pipe group are arranged, the plurality of arc-shaped arches 32 and the plurality of connection pipes 31 may be alternately arranged one by one. Gaps can be formed between two adjacent arc-shaped arch tubes 32 in an alternating arrangement mode, so that the contact probability of the arc-shaped arch tubes 32 and smoke is further improved.

In the actual use process, in order to facilitate the waste liquid to be treated to enter the combustion cavity 13, a combustion-supporting component and a liquid spraying component are further arranged on the inner side wall of the combustion cavity 13, and the liquid spraying component is located above the combustion-supporting component. As shown in fig. 3 and 4, the combustion supporting assembly includes a primary air distribution nozzle 41 and a primary combustion supporting port 42, and the spray assembly includes: a secondary air distribution nozzle 51, a secondary combustion-supporting port 52 and a waste liquid nozzle 53. In operation, the worker can feed the auxiliary fuel to the combustion cavity 13 through the primary combustion port 42 and the secondary combustion port 52, thereby providing the heat energy required for waste liquid incineration. Then the waste liquid to be treated is sprayed into the combustion cavity in an atomized form through the waste liquid nozzle 53, combustion-supporting gas is conveyed into the combustion cavity 13 through the primary air distribution blast nozzle 41 and the secondary air distribution blast nozzle 51, and the waste liquid to be treated is uniformly distributed in the combustion cavity under the action of the combustion-supporting gas, so that sufficient incineration oxidation is obtained.

Optionally, in order to promote the waste liquid incineration effect of this device, avoid the waste liquid to produce poisonous intermediate product because of burning inadequately, hydrojet subassembly in this embodiment can set up to a plurality ofly, and a plurality of hydrojet subassemblies are evenly arranged along the direction of height of burning cavity 13. The staff can adjust hydrojet subassembly according to actual conditions sets up quantity and set up the position to the effect that burns of messenger's waste liquid accords with actual demand.

In the prior art, the cross-section of the spent liquor incineration boiler is usually provided as a square, and its nozzles for spraying the spent liquor are usually provided at the straight edge positions of the square. Thus, the space inside the boiler cannot be fully utilized because the waste liquid injection dead space is formed inside the boiler. Meanwhile, the nozzles on the two opposite straight edges are prone to interference, so that atomized waste liquid cannot be uniformly distributed in the boiler. To solve this problem, in the present embodiment, when the cross section of the combustion cavity 13 is square, the liquid jet assembly may be disposed at the corner formed by the adjacent two sidewalls of the combustion cavity 13. Compared with the prior art, the liquid spraying assembly of the device can effectively reduce the area of a dead angle of waste liquid spraying, and meanwhile, because the distance between two opposite corners of the opposite square is larger, the interference between two waste liquid nozzles 53 which are oppositely arranged can be effectively avoided, so that the distribution uniformity of waste liquid is improved.

Accordingly, when the entire cross section of the boiler body 1 is configured to be square, the arc-shaped arch tube 32 described in the present embodiment may also be specially designed according to the shape of the cross section. As shown in fig. 2, the arc-shaped arch tubes 32 can be uniformly distributed around the connecting cavity 12, so that the heat transfer rate between the combustion cavity 13 and the heat absorption cavity 11 can be maximally limited, and the best heat exchange effect between the arc-shaped arch tubes 32 and the flue gas can be obtained. In addition, because the front and rear side walls of the boiler are easy to drop ash in the actual working process, in order to save cost and reduce the difficulty of pipe arrangement of the connecting pipe group, the arc-shaped arch pipes 32 can be arranged only in the front and rear side wall areas of the connecting cavity 12, so that the arc-shaped arch pipes 32 can have the effect of blocking ash dropping.

As another alternative of this embodiment, a refractory chromium ore deposit 6 may be provided on the inner side wall of the combustion cavity 13. When using, high temperature resistant chromium ore deposit sand pouring layer 6 can improve the inside combustion temperature of burning cavity 13, can also protect the inside wall of second membrane wall 22 and burning cavity 13 simultaneously to avoid boiler body 1 to take place the damage.

The following explains the effects of the above-described scheme:

the embodiment provides a variable cross section integration waste liquid incineration boiler, can reduce the auxiliary fuel quantity through the cross-sectional area change of heat absorption cavity and burning cavity, can also improve waste liquid incineration boiler heat absorption efficiency simultaneously to make waste liquid incineration boiler have higher economic benefits and heat utilization ratio. Secondly, this device can restrict the heat transfer speed between burning cavity and the heat absorption cavity through connecting cavity and arc arched tube, can also block the ash phenomenon simultaneously to further improve waste liquid incineration boiler's heat utilization efficiency. In addition, the device can improve the uniformity degree of the waste liquid in the boiler through the arrangement position and the arrangement quantity of the liquid spraying assemblies, so that the waste liquid is subjected to uniform incineration and oxidation treatment.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a variable cross section integration waste liquid incineration boiler which characterized in that: the boiler comprises a boiler body (1), wherein a heat absorption cavity (11), a connecting cavity (12) and a combustion cavity (13) which are sequentially communicated from top to bottom are arranged in the boiler body (1), the cross section area of the heat absorption cavity (11) is larger than that of the combustion cavity (13), and the cross section area of the combustion cavity (13) is larger than that of the connecting cavity (12); a first membrane water-cooling wall (21) is arranged on the inner side wall of the heat absorption cavity (11), a second membrane water-cooling wall (22) is arranged on the inner side wall of the combustion cavity (13), a connecting pipe group is arranged on the inner side wall of the connecting cavity (12), and the first membrane water-cooling wall (21) is communicated with the second membrane water-cooling wall (22) through the connecting pipe group; the connecting pipe group comprises a plurality of connecting pipelines (31) and a plurality of arc-shaped arch pipes (32), the outer side walls of the connecting pipelines (31) are attached to the inner side walls of the connecting cavity (12), the arc tops of the arc-shaped arch pipes (32) face the inside of the connecting cavity (12), and a circulation channel is formed between the arc-shaped arch pipes (32) on the two opposite inner side walls of the connecting cavity (12); still be equipped with combustion-supporting subassembly and hydrojet subassembly on burning cavity (13) inside wall, combustion-supporting subassembly includes one-level air distribution tuyere (41) and one-level combustion-supporting mouth (42), and the hydrojet subassembly includes: a secondary air distribution nozzle (51), a secondary combustion-supporting opening (52) and a waste liquid nozzle (53), and the liquid spraying component is positioned above the combustion-supporting component.

2. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the connecting cavity (12) comprises a first conical section and a second conical section, the large end opening of the first conical section is communicated with the heat absorption cavity (11), the large end opening of the second conical section is communicated with the combustion cavity (13), and the small end opening of the first conical section is communicated with the small end opening of the second conical section.

3. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the liquid spray assemblies are multiple and are uniformly arranged along the height direction of the combustion cavity (13).

4. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the arc-shaped arch pipes (32) and the connecting pipelines (31) are alternately arranged one by one.

5. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the cross section of the combustion cavity (13) is square, and the liquid spraying assembly is arranged at the corner formed by two adjacent side walls of the combustion cavity (13).

6. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: and a high-temperature-resistant chromium ore sand pouring layer (6) is arranged on the inner side wall of the combustion cavity (13).

7. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the bottom of the combustion cavity (13) is provided with a circulating chute (71) and a cooling interlayer channel (72).

8. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the variable cross-section integrated waste liquid incineration boiler comprises a waste heat recovery assembly, wherein the waste heat recovery assembly comprises a connecting channel (81), a steering chamber (82) and a plate type heat exchanger (83) which are sequentially communicated, the air inlet end of the connecting channel (81) is communicated with a heat absorption cavity (11), and the air outlet end of the plate type heat exchanger (83) is communicated with a quenching heat exchanger; a screen type tube bank (811) and a third membrane type water-cooling wall are arranged in the connecting channel (81), and a dust collecting hopper (812) is arranged at the bottom of the connecting channel (81).

9. A variable cross-section integrated waste liquid incineration boiler according to claim 1, characterized in that: the top of the heat absorption cavity (11) is provided with a close-packed heat absorption tube panel (9).