CN209743679U

CN209743679U - Water-sealed tank

Info

Publication number: CN209743679U
Application number: CN201920467959.4U
Authority: CN
Inventors: 赵志芹; 张文立
Original assignee: Beijing Petrochemical Engineering Co Ltd
Current assignee: Beijing Petrochemical Engineering Co Ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2019-12-06
Anticipated expiration: 2029-04-09

Abstract

The utility model discloses a water-sealed tank includes: the cold wall structure is provided with a flue gas inlet and a flue gas outlet, and comprises an upper outer cylinder and a lining, wherein the materials of the upper outer cylinder and the lining are the same as the material of a flue where the water seal tank is located; the hot wall structure is used for containing water seal liquid, and is provided with a lower outer cylinder, a water inlet and a water outlet are formed in the lower outer cylinder, and the hot wall structure is used for containing the water seal liquid with a preset height; a tapered transition structure between the cold wall structure and the hot wall structure; the conical transition structure comprises a conical section cylinder and a conical section lining, and the thickness of the conical section lining is reduced along with the reduction of the height; a flue gas inner barrel having opposite top and bottom ends, the top end being connected to the outer barrel of the flue gas inlet, the bottom end extending into the water seal liquid in the hot wall structure; and the overflow pipeline is communicated with the water outlet. The utility model discloses can reduce flue thermal expansion volume, reduce material and later stage cost of maintenance.

Description

water-sealed tank

Technical Field

the utility model relates to a catalytic cracking unit flue gas energy recuperation technical field, in particular to water sealed tank suitable for among catalytic cracking unit flue gas energy recuperation system.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

In the flue gas energy recovery system of the catalytic cracking device, the temperature of flue gas discharged from a smoke machine is up to 700 ℃, and the temperature of an outlet of a waste heat boiler is 180-220 ℃. In a catalytic cracking unit flue gas energy recovery system, a water seal tank is used as an auxiliary device of a waste heat boiler and is generally arranged on an inlet and an outlet of the waste heat boiler and a bypass flue.

the diameter of the flue is generally large, and if a large-caliber high-temperature-resistant flue valve is arranged in the flue, the large-caliber high-temperature-resistant flue valve is high in manufacturing cost and is not easy to operate. At present, when the waste heat boiler is overhauled, the water seal tank is used as a special watertight valve to play a role in isolating smoke. Specifically, when the flue gas water-sealed tank is used as a flue valve in a flue, the flue gas water-sealed tank has the advantages of simple structure, convenience in operation, high safety and relatively low manufacturing cost, and is widely applied to catalytic cracking devices.

However, conventional water-sealed tanks are typically made as a unitary cold-wall or hot-wall structure, which all suffer from various disadvantages in use.

For the water-sealed tank in the form of an integral cold wall structure, a section of stainless steel inner cylinder is required to be added in the lining of the water-sealed part. Because the heat conductivity coefficients of different materials are different, the heat conductivity coefficient of the stainless steel material is large, and the thermal expansion rate is far higher than that of the lining material, so that the stainless steel inner cylinder is wrinkled, torn and deformed and leaks. In addition, the difference between the internal temperature and the external temperature of the water-sealed tank makes the thermal expansion amount of the stainless steel inner cylinder and the carbon steel outer cylinder different, the water inlet, the water outlet and the manhole are both connected with the stainless steel inner cylinder and the carbon steel outer cylinder, and the pipe orifice roots of the water inlet, the water outlet and the manhole are torn due to the difference of the thermal expansion coefficients of the two cylinders, so that leakage is generated. On the whole, use the reliability relatively poor, later stage maintenance cost is high.

For the form that the water-sealed tank is of an integral hot-wall structure, the whole water-sealed tank is made of stainless steel. When the flue gas inlet and outlet are connected with the flue, a transition section from a hot wall structure to a cold wall structure is needed, so that the distance between the two flue gas inlets and outlets is increased, and the using amount of stainless steel materials is increased on the whole. In addition, the large thermal expansion amount of the stainless steel causes large displacement of the expansion joint in the flue, thereby increasing the cost of the expansion joint and leading to high initial construction cost.

In summary, there is a need for a new water-sealed tank to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a water sealed tank can effectively reduce flue thermal expansion volume, reduce material and later stage cost of maintenance.

The above object of the present invention can be achieved by the following technical solutions:

A water-sealed tank, comprising: the cold wall structure is provided with a flue gas inlet and a flue gas outlet, the cold wall structure comprises an upper outer cylinder and a lining, and the materials of the upper outer cylinder and the lining are the same as those of a flue where the water seal tank is located; the hot wall structure is used for containing water seal liquid, and is provided with a lower outer cylinder, a water inlet and a water outlet are formed in the lower outer cylinder, and the hot wall structure is used for containing the water seal liquid with a preset height; a tapered transition structure between the cold wall structure and the hot wall structure; the conical transition structure comprises a conical section cylinder and a conical section lining, and the thickness of the conical section lining is reduced along with the reduction of the height; a flue gas inner barrel having opposite top and bottom ends, the top end being connected to the outer barrel of the flue gas inlet, the bottom end extending into the water seal liquid in the hot wall structure; and the overflow pipeline is communicated with the water outlet.

in a preferred embodiment, the upper outer cylinder comprises a spherical head at the top and an upper cylinder for arranging the flue gas inlet and the flue gas outlet, and the spherical head and the upper cylinder are made of carbon steel.

In a preferred embodiment, the cone section cylinder body is a stainless steel cone cylinder with the height of at least 400mm, and the thickness of the cone section lining is gradually reduced along with the decreasing height.

In a preferred embodiment, the liner is a liner capable of controlling the temperature of the cold wall structure below 200 degrees celsius, the liner comprising: thermal liners and wear liners.

In a preferred embodiment, side pull ring anchoring nails are provided in the liner in a predetermined distribution.

In a preferred embodiment, a manhole is further arranged on the lower outer cylinder, a water inlet connecting pipe is arranged on the water inlet, a water outlet connecting pipe is arranged on the water outlet, a manhole connecting pipe is arranged on the manhole, and the water inlet connecting pipe, the water outlet connecting pipe and the manhole connecting pipe have the same thermal expansion coefficient as the material of the lower outer cylinder.

In a preferred embodiment, the lower outer cylinder is of a single-layer stainless steel structure, and the materials of the water inlet connecting pipe, the water outlet connecting pipe and the manhole connecting pipe are stainless steel.

In a preferred embodiment, the middle part of the flue gas inner cylinder is provided with a bending structure assembled in three sections, and the bottom of the flue gas inner cylinder is provided with a liquid level adjusting structure.

In a preferred embodiment, the liquid level adjusting structure is a sawtooth structure arranged at the bottom of the flue gas inner cylinder, the sawtooth structure comprises a plurality of sawteeth, and the height of the sawteeth is between 100mm and 150 mm.

In a preferred embodiment, the overflow line comprises an inverted U-shaped line having opposite inlet and outlet ends and a top end therebetween, the top end having a second valve disposed therein and the outlet end having a third valve disposed therein.

The utility model discloses a characteristics and advantage are: the water seal tank that provides in this application embodiment is one kind and reduces flue thermal expansion volume, reduces the dew point, reduces material cost and reduces the novel equipment of convenient easy operation of later stage maintenance. The novel water-sealed tank fully considers the structure of the whole flue, maintains the integral continuity of the flue structure, enables the lower part of the water-sealed tank to be free in thermal expansion, reduces the purchase cost of a flue expansion joint in a flue gas energy recovery system of a catalytic cracking device, also reduces the supporting load of the water-sealed tank, and reduces the initial construction cost of the whole flue. In the operation cycle of the water-sealed tank, the free expansion of the lower part of the water-sealed tank does not cause leakage due to expansion difference, and the later maintenance cost is reduced. The novel water-sealed tank provides guarantee for the safe operation of the novel water-sealed tank and the safe maintenance of the waste heat boiler, and has great reference significance for the design of a flue gas energy recovery system of a later catalytic cracking device. Particularly, the water-sealed tank with the original cold wall structure can be upgraded and modified under the condition that the expansion amount of the original flue is not changed, and the water-sealed tank has wide application space in the modification of the flue gas recovery system of the old device.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

FIG. 1 is a schematic structural view of a water-sealed tank according to an embodiment of the present application;

FIG. 2 is a top view of a water sealed tank in an embodiment of the present application;

FIG. 3 is a partial schematic view of the tapered transition structure of the water-sealed tank of FIG. 1;

FIG. 4 is a partial schematic structural view of the connection position of the flue gas inner cylinder, the cold wall structure and the outer cylinder of the water-sealed tank in FIG. 1;

FIG. 5 is a schematic view of a partial structure of a sawtooth structure arranged at the bottom end of the flue gas inner cylinder of the water-sealed tank in FIG. 1.

FIG. 6 is a top view of a spacing mechanism formed between a flue gas inner cylinder and a hot wall structure of a water-sealed tank in an embodiment of the present application;

FIG. 7 is a front view of a spacing mechanism formed between a flue gas inner cylinder and a hot wall structure of a water-sealed tank in an embodiment of the present application.

Description of reference numerals:

1. A cold wall structure; 10. an upper outer cylinder; 11. a flue gas inlet; 12. a flue gas outlet; 13. a liner; 2. a tapered transition structure; 20. a cone section cylinder; 21. a conical section liner; 211. a thermal insulating liner; 212. a wear resistant lining; 22. a side pull ring anchoring nail; 3. a hot wall structure; 30. a lower outer cylinder; 31. a water inlet; 32. a water outlet; 33. a manhole; 34. a sewage draining outlet; 4. a flue gas inner cylinder; 41. a top end; 42. a bottom end; 43. a bending structure; 44. a saw-tooth structure; 45. a transition section of the inlet of the inner flue gas barrel; 440. saw teeth; 441. tooth top; 442. a tooth bottom; 5. an overflow line; 50. a pipeline body; 51. a first valve, 52, a second valve; 53. a third valve; 6. an outer flue cylinder; 71. a first limit piece; 710. a first long hole; 72. a second limiting member; 720. a second long hole; 73. and a fixing member.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are only used for illustrating the present invention and are not used for limiting the scope of the present invention, and after reading the present invention, the modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the claims attached to the present application.

it will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a water sealed tank can effectively reduce flue thermal expansion volume, reduce material and later stage cost of maintenance.

Referring to fig. 1 and 2, in an embodiment of the present application, a water-sealed tank is provided, which mainly includes: the cold wall structure 1 is provided with a flue gas inlet 11 and a flue gas outlet 12, the cold wall structure 1 comprises an upper outer cylinder 10 and a lining 13, and the materials of the upper outer cylinder 10 and the lining 13 are the same as those of a flue where the water seal tank is located; the hot wall structure 3 is used for containing water sealing liquid, the hot wall structure 3 is provided with a lower outer cylinder 30, a water inlet 31 and a water outlet 32 are arranged on the lower outer cylinder 30, and the hot wall structure 3 is used for containing the water sealing liquid with a preset height; a conical transition structure 2 between the cold wall structure 1 and the hot wall structure 3; the conical transition structure 2 comprises a conical section cylinder 20 and a conical section lining 21, and the thickness of the conical section lining 21 is reduced along with the reduction of the height; a flue gas inner barrel 4 having opposite top and bottom ends, the top end being connected to the outer barrel of the flue gas inlet 11, the bottom end extending into the water seal liquid in the hot wall structure 3; and the overflow line 5 is communicated with the water outlet 32.

Wherein the cold wall structure 1 is located in the upper part of a water-sealed tank, the water-sealed tank comprises an upper outer cylinder 10 and a lining 13, and the lining 13 is arranged on the inner side of the upper outer cylinder 10. Specifically, the upper outer cylinder 10 includes a spherical head at the top and an upper cylinder for arranging the flue gas inlet 11 and the flue gas outlet 12. This cold wall structure 1 can directly be connected with the flue, for the water sealed tank that wholly is hot wall structure 3, need not to set up at flue gas entry 11 and realize the changeover portion that cold wall structure 1 is connected to hot wall structure 3 with the flue. After the transition section is omitted, the material cost and the manufacturing cost can be reduced, the extending height of the smoke inlet and outlet in the equipment shell can be reduced to the minimum, and the occupied area is saved.

Specifically, the material of the upper outer cylinder 10 may be carbon steel, which can also reduce the material cost compared to the prior art that uses a hot wall structure 3 made of stainless steel material. The lining 13 can be a heat-insulating wear-resistant lining, so that the temperature of the outer cylinder can be reduced to below 200 ℃, the flue gas can be resisted from being washed away, and the thermal expansion of the flue gas inlet and outlet is greatly reduced, so that the displacement during the selection of expansion joints is reduced, and the purchase cost of the expansion joints is reduced.

In a specific embodiment, the cold wall structure 1 may be a carbon steel outer cylinder, and the lining 13 is a heat-insulating wear-resistant lining capable of controlling the temperature of the upper outer cylinder 10 below 200 ℃. Wherein the heat insulating wear-resistant lining may comprise a heat insulating lining and a wear-resistant lining, wherein the heat insulating lining may be located outside the wear-resistant lining, i.e. the heat insulating lining is located between the wear-resistant lining and the upper tub 10.

The structure is mainly used for keeping the same cylinder material and lining material as the flue connected with the structure, so that the heat conductivity coefficient of the structure is consistent, and the construction is convenient. Wherein, the material selection of the heat insulation wear-resistant lining is important, the high temperature resistance and the smoke gas scouring resistance of the heat insulation wear-resistant lining are ensured, the heat conductivity coefficient of the lining material is also considered to meet the metal wall temperature required by the equipment shell, and the side pull ring anchoring nail 22 is adopted to ensure that the lining 13 is firmer due to the structural discontinuity of the part.

Specifically, the length of the side ring anchor pins 22 is matched to the thickness of the liner 13, and when the thickness of the liner 13 is relatively uniform or nearly the same, the side ring anchor pins 22 having the same length may be selected. The anchoring nails can be uniformly distributed along the circumferential direction of the water seal cylinder, and are distributed in multiple layers at intervals of a preset distance along the axial direction of the water seal cylinder.

A conical transition section is located between the cold wall structure 1 and the hot wall structure 3 for connecting the cold wall structure 1 at the upper part of the transition and the hot wall structure 3 at the lower part. Specifically, the conical transition section also comprises a conical section cylinder 20 and a conical section lining 21 positioned inside the conical section cylinder 20. Wherein, the conical section lining 21 can adopt the same heat-insulating wear-resisting lining as the cold wall structure 1. The cone section cylinder 20 may be made of stainless steel to accommodate high temperatures approaching 700 c. The stainless steel cone barrel 20 may have a height of at least 400mm and the cone liner 21 may have a thickness that decreases and tapers as the height decreases.

In a specific embodiment, when the conical section cylinder 20 adopts a stainless steel conical cylinder with the height of 400mm, and the conical section lining 21 is a heat-insulating wear-resistant lining with gradually reduced thickness, the whole lining structure consisting of the lining 13 in the cold wall structure 1 and the conical section lining 21 is stable, and the temperature of the cold wall carbon steel cylinder can be ensured not to exceed 200 ℃.

Referring to fig. 3, conical section liner 21 may include a heat insulation liner 211 and a wear-resistant liner 212, where heat insulation liner 211 is used to separate wear-resistant liner 212 from conical section cylinder 20 for temperature control. The wear-resistant lining 212 is mainly used for ensuring the reliability of the water sealed tank in use and prolonging the service life of the water sealed tank. The thermal insulation lining 211 is generally made of porous material with loose structure, the wear-resistant lining 212 is generally made of dense material, and the wear-resistant lining 212 is arranged on the inner side of the thermal insulation lining 211 to effectively seal the thermal insulation lining.

Specifically, the heat insulation lining 211, the wear-resistant lining 212 and the conical section cylinder 20 are fixedly connected through anchor nails. The anchor nails may be embodied as side-tab anchor nails 22, the length of the side-tab anchor nails 22 being shortened as the thickness of the liner 13 is gradually reduced to ensure that the entire liner of the water-sealed tank is flush. In addition, the tapered cylinder corresponds to a backing 13 pallet, and the backing 13 can be made more firm and less likely to fall off.

The cold wall structure 1 can be connected with the cone section cylinder 20 by welding. After welding of the conical section cylinder 20 of the area 1 of the cold wall structure, construction, maintenance, drying or pre-drying of the lining 13 is carried out, and subsequent construction is carried out after certain strength of the lining 13 is ensured.

The hot wall structure 3 is mainly used to form a water-sealed cylinder. Specifically, the water seal cylinder may include a stainless lower outer cylinder 30, a water inlet 31, a water outlet 32 and a manhole 33 provided on the lower outer cylinder 30. The lower outer cylinder 30 is integrally of a single-layer stainless steel structure, and the bottom thereof is a spherical cap-shaped end enclosure. A water inlet 31 connecting pipe is arranged at the water inlet 31, a water outlet 32 connecting pipe is arranged at the water outlet 32, a manhole 33 connecting pipe is arranged at the manhole 33, and all the connecting pipes are connected with the lower outer cylinder 30. Specifically, the thermal expansion coefficients of the water inlet 31 connecting pipe, the water outlet 32 connecting pipe and the manhole 33 connecting pipe are the same or nearly the same as the thermal expansion coefficient of the material of the lower outer cylinder 30. For example, the hot wall structure 3 may be made of stainless steel, that is, the lower cylinder and the water inlet 31 are connected, and the water outlet 32 is disposed at the water outlet 32 and the connection pipes are made of stainless steel.

On one hand, because the hot wall structure 3 is often contacted with the smoke at 700 ℃, the hot wall structure 3 can bear the high temperature of the smoke by adopting stainless steel materials; on the other hand, after the hot wall structure 3 is made of stainless steel materials, the thermal expansion coefficients of the lower cylinder and the connecting pipes are unified, so that leakage points caused by pipe orifice tearing due to thermal expansion can be avoided, and the effect of blocking smoke can be effectively achieved.

In addition, a drain outlet 34 is also arranged on the spherical cap-shaped sealing head of the lower cylinder body and is used for discharging dirt in the water seal tank during maintenance. The sewage outlet 34 is also provided with a connecting pipe, and the connecting pipe can be made of stainless steel, so that the whole water sealing cylinder is ensured to have better reliability.

The water sealing cylinder of the hot wall structure 3 provided in the specification is of a single-layer structure, has no internal heat-insulating wear-resistant lining, reduces the workload by one time for field construction, and greatly improves the construction quality and the construction progress.

The flue gas inner cylinder 4 is used as a flue gas inlet pipe, the flue gas inner cylinder 4 is provided with a top end 41 and a bottom end 42 which are opposite, the top end 41 is connected with an external cylinder body of the flue gas inlet 11, and the bottom end 42 extends into the water sealing liquid in the hot wall structure 3. Because the flue gas inner cylinder 4 can be directly contacted with high-temperature flue gas, the material of the flue gas inner cylinder 4 can be made of high-temperature resistant materials, such as stainless steel. The inlet position of the flue gas inner barrel 4 near the top end 41 is matched and connected with the flue gas inlet 11 of the cold wall structure 1. The middle part of the flue gas inner cylinder 4 is provided with a bending structure 43, and the bending structure 43 can be a 90-degree mitre bend structure.

Referring to fig. 4, the outer flue cylinder 6 at the flue gas inlet 11 is connected to the flue gas inner cylinder 4 through a flue gas inner cylinder inlet transition section 45. The flue gas inner barrel inlet transition section 45 is a tapered tube section having a predetermined length. The length of the transition section 45 of the inlet of the flue gas inner barrel can be 100mm, so that the reliability of the connection position is ensured. The material of the transition section 45 of the inlet of the flue gas inner barrel can be carbon steel, and the transition section 45 of the inlet of the flue gas inner barrel made of the carbon steel material is completely arranged inside the lining 13 so as to ensure that the carbon steel material is not over-temperature.

The diameter of a common flue is large, generally more than two meters, and the bending structure 43 is assembled in three sections. The assembly deviation ratio of the bending structure 43 is large due to the field construction conditions, and the bottom of the conventional flue gas inner cylinder 4 is in a wedge shape, so that the water level height of liquid level sealing is inevitably or inaccurately caused.

In order to solve the problem of inaccurate water level height of liquid level sealing in the prior art, the middle part of the flue gas inner cylinder 4 is provided with a bending structure 43 assembled in three sections, and the bottom of the flue gas inner cylinder 4 is provided with a liquid level adjusting structure. Specifically, the liquid level adjusting structure comprises any one or a combination of the following components: a zig-zag configuration 44, a wave configuration.

Referring to FIG. 5, in one embodiment, the bottom of the flue gas inner tube 4 has a saw-tooth structure 44. The bottom of the flue gas inner barrel 4 is designed into a sawtooth structure 44 with the height of 100-150 mm according to the diameter of a flue gas inlet and outlet. Specifically, the sawtooth structure 44 is uniformly provided with a plurality of sawteeth 440 along the circumferential direction. The saw teeth 440 have opposite tooth tops 441 and tooth bottoms 442, and the height from the tooth tops 441 to the tooth bottoms 442 of the saw teeth 440 (i.e., the saw tooth height H) is between 100mm and 150 mm.

Because the maximum on-site installation deviation of the existing flue gas inner cylinder 4 can reach 30mm, if the existing flue gas inner cylinder 4 with a wedge-shaped bottom is adopted, the water seal liquid level difference is correspondingly 30mm, namely the existing structure can not effectively offset the installation deviation. During use, the liquid level is ideally required to seal, but the sealing effect is not actually achieved due to the fact that the height of the liquid level is not enough.

If the bottom of the smoke inner cylinder 4 adopts the sawtooth structure 44 in the application, the actual calculated liquid level difference is calculated by the top end of the sawtooth 440, and the problem of insufficient height caused by installation deviation can be sufficiently counteracted after the height H of the sawtooth is increased to be 100-150 mm. In addition, the water seal liquid level fluctuation caused by liquid level fluctuation, flue gas pipeline pressure fluctuation and the like can be counteracted by the saw teeth 440 with the saw tooth height H of 100 mm-150 mm. In a special scene, even if leakage is generated at the inner barrel due to sudden increase of the smoke pressure, the top of the sawtooth 440 leaks slightly at the initial stage, and measures can be taken to repair the leakage in real time.

in the embodiment provided in the present specification, the inner flue gas cylinder 4 is provided with a first limiting member 71 on a side wall near the bottom end 42 thereof, and correspondingly, a second limiting member 72 is provided on an inner wall of the lower outer cylinder 30 of the hot wall structure 3, and the first limiting member 71 and the second limiting member 72 can constitute a limiting mechanism for limiting the inner flue gas cylinder 4.

as shown in fig. 6 and 7, the first limiting member 71 may be a first side plate disposed on the flue gas inner tube 4, and the first side plate is provided with a first long hole 710. The second stopper 72 may be a second side plate provided with a second long hole 720 on the lower outer cylinder 30 of the hot wall structure 3. The first long hole 710 and the second long hole 720 are opposite to each other, and the extending directions of the first long hole 710 and the second long hole 720 are perpendicular to each other. The first long hole 710 and the second long hole 720 are provided with a fixing member 73, and constitute the stopper mechanism. The limiting mechanism can ensure that the flue gas inner barrel 4 can have certain movement allowance in the horizontal plane. The fixing member 73 may be a bolt, and of course, the fixing member 73 may also be in other forms, and the application is not limited in this respect.

The lower outer cylinder 30 is provided with the water outlet 32 at a position close to the bottom thereof, the water outlet 32 is provided with a first valve 51, and an overflow line 5 is bypassed on a line between the water outlet 32 and the first valve 51.

The overflow line 5 comprises an inverted U-shaped line body 50, the line body 50 having opposite inlet and outlet ends and a top end located between the inlet and outlet ends. Wherein a second valve 52 is provided at the top end and a third valve 53 is provided at the outlet end. The height of the top of the pipeline body 50 is equal to the height of the liquid level during water sealing. When the smoke flows in the water seal tank, the three valves are closed to prevent the smoke from leaking. Wherein, the outlet end of the pipeline body is an overflow port.

When water sealing is carried out, the second valve 52 at the top of the pipeline body 50 and the third valve 53 at the outlet end of the pipeline are opened, the water inlet 31 is opened, when water flows out from the overflow port, the second valve 52 at the top of the inverted U-shaped pipeline is closed, the valve of the water inlet 31 is screwed down until the water flows out from the overflow port continuously, and therefore the height of the water sealing liquid level is guaranteed and water is saved. When the water seal is finished, the valve of the water inlet 31 is closed, the first valve 51 at the water outlet is opened to drain water, and the whole water seal overflow function is realized.

The utility model provides a water-sealed tank is the novel equipment of the convenient easy operation that reduces flue thermal expansion volume, reduces the dew point, reduces material cost and reduce the later stage maintenance. The novel water-sealed tank fully considers the structure of the whole flue, maintains the integral continuity of the flue structure, enables the lower part of the water-sealed tank to be free in thermal expansion, reduces the purchase cost of a flue expansion joint in a flue gas energy recovery system of a catalytic cracking device, also reduces the supporting load of the water-sealed tank, and reduces the initial construction cost of the whole flue. In the operation cycle of the water-sealed tank, the free expansion of the lower part of the water-sealed tank does not cause leakage due to expansion difference, and the later maintenance cost is reduced. The novel water-sealed tank provides guarantee for the safe operation of the novel water-sealed tank and the safe maintenance of the waste heat boiler, and has great reference significance for the design of a flue gas energy recovery system of a later catalytic cracking device. Particularly, the water-sealed tank of the original cold wall structure 1 can be upgraded and modified under the condition that the expansion amount of the original flue is not changed, and the water-sealed tank has wide application space in the modification of a flue gas recovery system of an old device.

Generally, this kind of neotype water-sealed tank perfect has combined the advantage of traditional water-sealed tank, and ingenious its unfavorable structure of avoiding again can reduce the investment of whole device to be difficult for revealing the maintenance that has reduced the later stage. The method has the advantage of playing a greater role in a catalytic cracking unit flue gas energy recovery system.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

all articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

a plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.

The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are disclosed as above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A water-sealed tank, comprising:

The cold wall structure is provided with a flue gas inlet and a flue gas outlet, the cold wall structure comprises an upper outer cylinder and a lining, and the materials of the upper outer cylinder and the lining are the same as those of a flue where the water seal tank is located;

the hot wall structure is used for containing water seal liquid, and is provided with a lower outer cylinder, a water inlet and a water outlet are formed in the lower outer cylinder, and the hot wall structure is used for containing the water seal liquid with a preset height;

A tapered transition structure between the cold wall structure and the hot wall structure; the conical transition structure comprises a conical section cylinder and a conical section lining, and the thickness of the conical section lining is reduced along with the reduction of the height;

A flue gas inner barrel having opposite top and bottom ends, the top end being connected to the outer barrel of the flue gas inlet, the bottom end extending into the water seal liquid in the hot wall structure;

And the overflow pipeline is communicated with the water outlet.

2. The water-sealed tank of claim 1, wherein the upper outer cylinder comprises a spherical head at the top and an upper cylinder for arranging the flue gas inlet and the flue gas outlet, and the spherical head and the upper cylinder are made of carbon steel.

3. The water-sealed tank of claim 1, wherein said cone-section cylinder is a stainless steel cone having a height of at least 400mm, and said cone-section liner has a thickness that gradually decreases with decreasing height.

4. a water-sealed tank according to claim 2 or 3, wherein the liner is a liner capable of controlling the temperature of the cold wall structure below 200 degrees celsius, the liner comprising: thermal liners and wear liners.

5. The water-sealed tank of claim 4, wherein the liner has side-tab anchor studs disposed therein in a predetermined distribution.

6. The water sealed tank of claim 1, wherein a manhole is further provided on the lower outer cylinder, a water inlet connection pipe is provided on the water inlet, a water outlet connection pipe is provided on the water outlet, a manhole connection pipe is provided on the manhole, and the water inlet connection pipe, the water outlet connection pipe and the manhole connection pipe have the same thermal expansion coefficient as the material of the lower outer cylinder.

7. The water sealed tank of claim 6, wherein said lower outer cylinder is a single layer stainless steel structure, and said water inlet, water outlet and manhole pipe are made of stainless steel.

8. The water-sealed tank of claim 1, wherein the middle part of the inner flue gas cylinder is provided with a bending structure assembled in three sections, and the bottom of the inner flue gas cylinder is provided with a liquid level adjusting structure.

9. The water sealed tank of claim 8, wherein the liquid level regulating structure is a saw-tooth structure disposed at the bottom of the flue gas inner cylinder, the saw-tooth structure comprises a plurality of saw teeth, and the height of the saw teeth is between 100mm and 150 mm.

10. The water-sealed tank of claim 1, wherein the overflow line comprises an inverted U-shaped line body having opposing inlet and outlet ends and a top end therebetween, the top end having a second valve disposed therein and the outlet end having a third valve disposed therein.