A CO2 capture and storage system for an oilfield steam injection boiler and a boiler

Abstract

The application relates to the technical field of steam injection boilers, in particular to a CO2 capture and storage system of an oilfield oil displacement steam injection boiler and the boiler. The system comprises a tank body, a hot gas conveying assembly is connected to the middle part of the tank body, a manhole sealing piece is connected to the upper end of the side wall of the tank body, a first sealing dismounting piece is connected to the upper end of the manhole sealing piece, a second sealing locking piece is connected to the lower end of the manhole sealing piece, and the middle part of the second sealing locking piece is connected with a second sealing switching piece. When the sealing gasket needs to be replaced, the second sealing switching piece is rotated to block the tank body. At this time, the first sealing dismounting piece is rotated, the first sealing dismounting piece is used for unlocking the manhole sealing piece and releasing the manhole sealing piece, the manhole sealing piece can be taken out without stopping the machine at this time, and the manhole sealing piece can be repaired without stopping the machine.

Description

Technical Field

[0001] This invention relates to the field of steam injection boiler technology, and in particular to a CO2 capture and storage system and boiler for an oilfield enhanced oil recovery steam injection boiler. Background Technology

[0002] Steam injection boilers are important production equipment widely used in the extraction of heavy oil or the later stages of extraction of light oil in oil fields; they are also known as wet steam generators.

[0003] During use, the existing technology has a low efficiency in treating exhaust gas and preheating flue gas in steam injection boilers. Furthermore, the existing technology requires shutdown for repairing or replacing the gaskets of the manholes, which is very complicated. Summary of the Invention

[0004] In view of the problems of exhaust gas treatment in steam injection boilers mentioned above or in the prior art, this invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a CO2 capture and storage system for an oilfield flooding steam injection boiler.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] As a preferred embodiment of the CO2 capture and storage system of the oilfield flooding steam injection boiler of the present invention, it includes a steam injection boiler;

[0008] The flue gas inlet of the steam injection boiler is connected to a burner, the air inlet of the burner is connected to a gas mixing device, the flue gas outlet of the steam injection boiler is connected to the air inlet of the gas mixing device, the air inlet of the gas mixing device is connected to the air outlet of the air separation device through a vent pipe, and the steam outlet of the steam injection boiler is connected to the steam inlet pipe of the power drive device of the air separation device.

[0009] The flue gas outlet of the steam injection boiler is connected to the preheater via a vent pipe. The air outlet of the preheater is connected to the air inlet of the spray tower. The air outlet of the spray tower is connected to the air inlet of the condenser. The liquid outlet of the condenser is connected to the third booster pump. The condensate outlet of the preheater is connected to the water outlet of the spray tower. The water inlet of the spray tower is connected to the water outlet of the first booster pump. The water outlet of the spray tower is connected to the water inlet of the water treatment device. The water inlet of the first booster pump is connected to the water outlet of the water treatment device. The water outlet of the water treatment device is connected to the second booster pump. The water inlet of the preheater is connected to the second booster pump. The water outlet of the preheater is connected to the water inlet of the steam injection boiler. A bypass valve is installed between the water inlet and outlet of the preheater. The cold source inlet and outlet of the condenser are connected to the air separator.

[0010] The outlet of the preheater is connected to the inlet of the steam injection boiler. The outlet of the air separator is divided into two paths: the N2 pipeline is connected to each instrument using instrument air, and the O2 pipeline is connected to the inlet of the gas mixing device. The steam condensate of the air separator is connected to the inlet of the second booster pump as boiler feedwater.

[0011] The beneficial effects of the CO2 capture and storage system of the oilfield flooding steam injection boiler of the present invention are as follows: The present invention preheats and reuses the flue gas by introducing high-temperature flue gas into a preheater and a mixing device, and separates the air by high-temperature steam, so that pure oxygen is used to assist combustion when the gas is burned, thereby making the flue gas component high-purity carbon dioxide. At this time, carbon dioxide is collected and stored by purifying the carbon dioxide.

[0012] In actual use, there is still a problem of difficulty in replacing the manhole seal ring of the steam injection boiler.

[0013] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a boiler, including a CO2 capture and storage system for an oilfield flooding steam injection boiler, and including a tank;

[0014] A manhole assembly is connected to the upper outer wall of the tank;

[0015] A hot gas conveying assembly is connected to the middle of the tank;

[0016] The manhole assembly includes a manhole seal. The upper end of the side wall of the tank is connected to the manhole seal. The upper end of the manhole seal is connected to a first sealing disassembly component. The lower end of the manhole seal is connected to a second sealing locking component. The middle part of the second sealing locking component is connected to a second sealing switching component.

[0017] As a preferred embodiment of the boiler of the present invention, the manhole sealing element includes a manhole, a manhole is provided at the upper end of the side wall of the tank, a sealing groove is provided on the inner wall of the manhole, a sealing cylinder is snapped into the middle of the manhole, an air bladder is fixedly connected to the outer side wall of the sealing cylinder, the air bladder is connected to the inside of the sealing cylinder through a vent hole, and an inflation hole is provided on the bottom plate of the sealing cylinder.

[0018] In a preferred embodiment of the boiler of the present invention, the first sealing assembly includes a first locking plate. The top of the sealing cylinder is fixedly connected to the first locking plate. Several sets of first locking grooves are opened on the outer side of the upper end of the first locking plate. The interior of each of the first locking grooves is slidably connected to a first locking pin. The top of each of the first locking pins is fixedly connected to a first limiting slider. The top of the first locking plate is slidably connected to a first driving rotating plate. The lower end of the first driving rotating plate above the first limiting slider is opened to a first limiting groove. The upper end of each of the first limiting sliders is slidably connected to the first limiting groove. The first driving rotating plate and the first locking plate are opened to have first vent holes that correspond one-to-one. The inner wall of the manhole on the outer side of each of the first locking pins is opened to a first locking slot. The ends of the first locking pins that are far apart from each other are inserted into the first locking slots.

[0019] In a preferred embodiment of the boiler of the present invention, the second sealing locking component includes a second locking plate. The bottom of the sealing cylinder is contacted and connected to the second locking plate. Several sets of second locking grooves are opened on the outer side of the lower end of the second locking plate. The interior of each of the second locking grooves is slidably connected to a second locking pin. The bottom of each of the second locking pins is fixedly connected to a second limiting slider. Several sets of second vent holes are opened on the second locking plate. A vent pipe is fixedly connected to the top of each of the second locking holes. The upper end of each vent pipe is inserted into an air filling hole. A second locking slot is opened inside the manhole on the outer side of each of the second locking pins. The outer side of each of the second locking pins is inserted into the second locking slot.

[0020] In a preferred embodiment of the boiler of the present invention, the second sealing switching component includes a second driving rotating plate, the bottom of the second locking plate is in contact with the second driving rotating plate, the outer end of the second driving rotating plate is provided with a plurality of second limiting sliding grooves, the lower ends of the second limiting sliders are all slidably connected in the second limiting sliding grooves, the second driving rotating plate is provided with a plurality of third vent holes, the top of the second driving rotating plate is fixedly connected with a driving rotating rod, the upper end of the driving rotating rod passes through the second locking plate, the sealing cylinder, the first locking plate and the first driving rotating plate, and the driving rotating rod is rotatably connected to the second locking plate, the sealing cylinder, the first locking plate and the first driving rotating plate.

[0021] In a preferred embodiment of the boiler of the present invention, when the first locking pin disengages from the first locking slot, the first driving rotating plate is connected to the first vent hole on the first locking plate.

[0022] In a preferred embodiment of the boiler of the present invention, when the second locking pin disengages from the second locking slot, the third vent hole is connected to the vent pipe and the second vent hole.

[0023] In a preferred embodiment of the boiler of the present invention, the hot gas conveying assembly includes a first isolation plate. The first isolation plate is fixedly connected to both the left and right ends of the interior of the tank. Several sets of gas supply pipes are fixedly connected between the two sets of first isolation plates. A second isolation plate is fixedly connected to the left side wall of the first isolation plate on the left side. The second isolation plate divides the space separated by the first isolation plate on the left side into two parts.

[0024] The beneficial effects of the boiler of the present invention are as follows: When it is necessary to replace the sealing gasket, the second sealing switching component is rotated to seal the tank. At this time, the first sealing disassembly component is rotated, and the first sealing disassembly component unlocks the manhole seal and releases and depressurizes the manhole seal. At this time, the manhole seal can be removed without stopping the machine, thus realizing the repair of the manhole seal without stopping the machine. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the overall structure of a CO2 capture and storage system for an oilfield flooding steam injection boiler.

[0027] Figure 2 A schematic diagram of the overall structure of the boiler. Figure 1 .

[0028] Figure 3 A schematic diagram of the overall structure of the boiler. Figure 2 .

[0029] Figure 4 This is a schematic diagram of the boiler's inspection table structure.

[0030] Figure 5 This is a schematic diagram of the boiler's gas supply pipe structure.

[0031] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0032] Figure 7 This is a schematic diagram of the boiler's air bladder structure.

[0033] Figure 8 This is a schematic diagram of the first locking slide structure of the boiler.

[0034] Figure 9 This is a schematic diagram of the first limiting slide of the boiler.

[0035] The labels in the diagram represent: 1. Tank body; 2. Manhole assembly; 21. Manhole seal; 211. Manhole; 212. Sealing groove; 213. Sealing cylinder; 214. Airbag; 215. Inflation port; 22. First sealing assembly / disassembly component; 221. First drive plate; 222. First vent; 223. First locking plate; 224. First locking groove; 225. First locking pin; 226. First limiting slider; 227. First locking slot; 228. First limiting groove; 2 3. Second sealing locking component; 231. Second locking plate; 232. Second locking groove; 233. Second locking pin; 234. Second limiting slider; 235. Second locking slot; 236. Second vent hole; 237. Vent pipe; 24. Second sealing switching component; 241. Second drive rotating plate; 242. Second limiting groove; 243. Drive rotating rod; 244. Third vent hole; 3. Hot air conveying assembly; 31. First isolation plate; 32. Air supply pipe; 33. Second isolation plate. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1, referring to Figure 1 This is the first embodiment of the present invention. This embodiment provides a CO2 capture and storage system for an oilfield flooding steam injection boiler, which can achieve the effect of preheating and reusing waste gas and capturing and storing CO2. It includes a steam injection boiler.

[0040] The flue gas inlet of the steam injection boiler is connected to a burner, the air inlet of the burner is connected to a gas mixing device, the flue gas outlet of the steam injection boiler is connected to the air inlet of the gas mixing device, the air inlet of the gas mixing device is connected to the air outlet of the air separation device through a vent pipe, and the steam outlet of the steam injection boiler is connected to the steam inlet pipe of the power drive device of the air separation device.

[0041] The flue gas outlet of the steam injection boiler is connected to the preheater via a vent pipe. The air outlet of the preheater is connected to the air inlet of the spray tower. The air outlet of the spray tower is connected to the air inlet of the condenser. The liquid outlet of the condenser is connected to the third booster pump. The condensate outlet of the preheater is connected to the water outlet of the spray tower. The water inlet of the spray tower is connected to the water outlet of the first booster pump. The water outlet of the spray tower is connected to the water inlet of the water treatment device. The water inlet of the first booster pump is connected to the water outlet of the water treatment device. The water outlet of the water treatment device is connected to the second booster pump. The water inlet of the preheater is connected to the second booster pump. The water outlet of the preheater is connected to the water inlet of the steam injection boiler. A bypass valve is installed between the water inlet and outlet of the preheater. The cold source inlet and outlet of the condenser are connected to the air separator.

[0042] The outlet of the preheater is connected to the inlet of the steam injection boiler. The outlet of the air separation device is divided into two paths: the N2 pipeline is connected to each instrument using instrument air, and the O2 pipeline is connected to the inlet of the gas mixing device. The steam condensate of the air separation device is connected to the inlet of the second booster pump as boiler feedwater.

[0043] During operation, water is pumped through a preheater into the steam injection boiler via a second booster pump. The water is evaporated into high-pressure steam in the boiler. A large portion of the high-pressure steam is used, while a smaller portion is sent to an air separator for energy. Air is then sent to the air separator for separation. The separated N2 is sent to various instruments as instrument air, and the separated pure oxygen is sent to a mixing device. The flue gas from the steam injection boiler is then sent to the mixing device, where the high-temperature flue gas preheats and mixes with the pure oxygen. The resulting mixture is then sent to the burner for combustion. The high-temperature flue gas produced by the combustion of pure oxygen and fuel gas is relatively pure carbon dioxide. Furthermore, since the energy required for the air separator is provided by the high-temperature steam produced by the steam injection boiler, the high-temperature steam is reused, saving energy. The high-temperature flue gas produced by the combustion of the mixed gas in the burner is then sent back to the steam injection boiler, where it undergoes further processing. After heat exchange, a portion of the flue gas is sent to a mixing device to preheat pure oxygen, achieving preheating utilization. Another portion of the high-temperature flue gas is sent to a preheater to preheat the water to be sent into the steam injection boiler, achieving flue gas preheating utilization. The condensate from the preheater is sent to a water treatment device for purification and then sent to a spray tower via a first booster pump. The wastewater from the spray tower outlet is also sent to a water treatment device for purification and then sent to a spray tower via a first booster pump. The cooled flue gas is sent to the spray tower for purification into high-purity carbon dioxide. After purification in the spray tower, the flue gas is sent to a condenser. At this time, the condensed carbon dioxide is sent out by a third booster pump for replenishment and storage. The condensate from the condenser is sent to the steam injection boiler via a second booster pump, thus achieving the collection of carbon dioxide in the flue gas of the steam injection boiler and the perfect utilization of the condensate. The entire process does not produce any waste gas and utilizes the residual heat of the flue gas flowing out of the steam injection boiler, achieving perfect utilization and recovery of flue gas and condensate.

[0044] Example 2, refer to Figures 2-9 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a boiler, which includes a tank 1.

[0045] A manhole assembly 2 is connected to the upper outer wall of tank 1;

[0046] A hot gas conveying assembly 3 is connected to the middle of the tank body 1;

[0047] The manhole assembly 2 includes a manhole seal 21. The upper end of the side wall of the tank body 1 is connected to the manhole seal 21. The upper end of the manhole seal 21 is connected to a first sealing disassembly component 22. The lower end of the manhole seal 21 is connected to a second sealing locking component 23. The middle part of the second sealing locking component 23 is connected to a second sealing switching component 24.

[0048] The manhole seal 21 includes a manhole 211. A manhole 211 is provided at the upper end of the side wall of the tank body 1. A sealing groove 212 is provided on the inner wall of the manhole 211. A sealing cylinder 213 is snapped into the middle of the manhole 211. An air bag 214 is fixedly connected to the outer wall of the sealing cylinder 213. The air bag 214 is connected to the inside of the sealing cylinder 213 through a vent hole. An inflation hole 215 is provided on the bottom plate of the sealing cylinder 213.

[0049] The first sealing assembly 22 includes a first locking plate 223. The top of the sealing cylinder 213 is fixedly connected to the first locking plate 223. Several sets of first locking grooves 224 are opened on the outer side of the upper end of the first locking plate 223. The interior of each first locking groove 224 is slidably connected to a first locking pin 225. The top of each first locking pin 225 is fixedly connected to a first limiting slider 226. The top of the first locking plate 223 is slidably connected to a first driving rotating plate 221. The lower end of the first driving rotating plate 221 above the first limiting slider 226 is opened to a first limiting groove 228. The upper end of the first limiting slider 226 is slidably connected in the first limiting groove 228. The first driving rotating plate 221 and the first locking plate 223 are opened to have corresponding first vent holes 222. The inner wall of the manhole 211 on the outer side of the first locking pin 225 is opened to a first locking slot 227. The ends of the first locking pins 225 that are far apart from each other are inserted into the first locking slots 227.

[0050] A pull handle is fixedly connected to the top of the first drive plate 221;

[0051] The second sealing locking component 23 includes a second locking plate 231. The bottom of the sealing cylinder 213 is in contact with the second locking plate 231. Several sets of second locking grooves 232 are opened on the outer side of the lower end of the second locking plate 231. Second locking pins 233 are slidably connected inside the second locking grooves 232. Second limiting sliders 234 are fixedly connected to the bottom of the second locking pins 233. Several sets of second vent holes 236 are opened on the second locking plate 231. Vent pipes 237 are fixedly connected to the top of the second locking plate 231 above the second vent holes 236. The upper ends of the vent pipes 237 are inserted into the air holes 215. Second locking slots 235 are opened inside the manholes 211 on the outer side of the second locking pins 233. The outer side of the second locking pins 233 is inserted into the second locking slots 235.

[0052] The second sealing switching component 24 includes a second driving rotating plate 241. The bottom of the second locking plate 231 is in contact with the second driving rotating plate 241. The outer end of the second driving rotating plate 241 is provided with several sets of second limiting slide grooves 242. The lower ends of the second limiting sliders 234 are all slidably connected in the second limiting slide grooves 242. The second driving rotating plate 241 is provided with several sets of third vent holes 244. The top of the second driving rotating plate 241 is fixedly connected with a driving rotating rod 243. The upper end of the driving rotating rod 243 passes through the second locking plate 231, the sealing cylinder 213, the first locking plate 223 and the first driving rotating plate 221. The driving rotating rod 243 is rotatably connected to the second locking plate 231, the sealing cylinder 213, the first locking plate 223 and the first driving rotating plate 221.

[0053] When the first locking pin 225 disengages from the first locking slot 227, the first drive plate 221 connects with the first vent hole 222 on the first locking plate 223.

[0054] When the second locking pin 233 disengages from the second locking slot 235, the third vent 244 is connected to the vent pipe 237 and the second vent 236.

[0055] A throttle handle is snapped onto the top of the drive lever 243;

[0056] The hot gas conveying assembly 3 includes a first isolation plate 31. The first isolation plate 31 is fixedly connected to both the left and right ends of the tank body 1. Several sets of gas delivery pipes 32 are fixedly connected between the two sets of first isolation plates 31. A second isolation plate 33 is fixedly connected to the left side wall of the first isolation plate 31 on the left side. The second isolation plate 33 divides the space separated by the first isolation plate 31 on the left side into two parts.

[0057] Several sets of instruments are connected to the upper side wall of tank 1 via pipes;

[0058] The inlet pipe and outlet pipe are fixedly connected to the left side wall of the tank 1 on both sides of the second isolation plate 33.

[0059] When water needs to be heated to produce steam, high-temperature flue gas is injected into the front air supply pipe 32 through the air inlet pipe. The high-temperature flue gas enters the rear air supply pipe 32 through the space on the right side of the first isolation plate 31, thereby heating the water inside the tank 1. When steam is generated inside the tank 1, the gas pressure inside the tank 1 increases. At this time, the gas inside the tank 1 enters the interior of the sealing cylinder 213 through the third vent 244 and the vent pipe 237. At this time, the gas inside the sealing cylinder 213 enters the air bladder 214 through the air hole. The air bladder 214 expands and fills the sealing groove 212, thereby sealing the tank 1. When the air bladder 214 needs to be repaired or replaced, the drive lever 2 is rotated. 43. The drive lever 243 drives the second drive plate 241 to rotate, which in turn drives the second limiting slide groove 242 to rotate. The second limiting slide groove 242, through the second limiting slider 234, drives the second locking pin 233 to move away from each other and engage in the second locking slot 235. At this time, the third vent 244 is misaligned with the second vent 236, thus locking the second locking plate 231 and blocking the third vent 244. Then, the first drive plate 221 is rotated, which drives the first limiting slide groove 228 to rotate. The first limiting slide groove 228, through the first limiting slider 226, drives all the first locks. The fixed insertion pins 225 move closer to each other. When the first locking insertion pin 225 disengages from the first locking slot 227, the first drive rotating plate 221 connects with the first vent hole 222 on the first locking plate 223. At this time, the gas in the sealing cylinder 213 is discharged through the first vent hole 222. After the gas in the sealing cylinder 213 decreases, the sealing cylinder 213 and the airbag 214 can be removed. Since the tank body 1 is still blocked by the second drive rotating plate 241, the airbag 214 can be disassembled and repaired without stopping the machine. After the airbag 214 is repaired, the sealing cylinder 213 is reinserted into the manhole 211 and inflated through the vent pipe 237 and the inflation hole 215. Positioning is achieved by rotating the first drive plate 221, which drives the first locking pin 225 to insert into the first locking slot 227, thereby locking the sealing cylinder 213. Then, rotating the drive rod 243 drives the second locking pin 233 to disengage from the second locking slot 235 via the second drive plate 241. At this time, the third vent 244 is connected to the second vent 236, allowing the gas in the tank 1 to enter the sealing cylinder 213 through the first locking groove 224 and the vent pipe 237, thus resealing the tank 1. This allows for easy replacement and repair of the airbag 214 without stopping the machine.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A CO2 capture and storage system for an oilfield steam-assisted gravity drainage boiler, characterized by: The steam injection boiler comprises a flue gas inlet, a flue gas outlet, a steam outlet, a water inlet, and a water outlet. The flue gas inlet of the steam injection boiler is connected with a burner, the air inlet of the burner is connected with a gas mixing device, the flue gas outlet of the steam injection boiler is connected with the air inlet of the gas mixing device, the air inlet of the gas mixing device is connected with the air outlet of an air separation device through an air pipe, the steam outlet of the steam injection boiler is connected with the steam inlet pipe of a power driving device of the air separation device. The flue gas outlet of the steam injection boiler is connected with a preheater through an air pipe, the air outlet of the preheater is connected with the air inlet of a spray tower, the air outlet of the spray tower is connected with the air inlet of a condenser, the liquid outlet of the condenser is connected with a third booster pump, the condensate water outlet of the preheater is connected with the water outlet of the spray tower, the water inlet of the spray tower is connected with the water outlet of a first booster pump, the water outlet of the spray tower is connected with the water inlet of a water treatment device, the water inlet of the first booster pump is connected with the water outlet of the water treatment device, the water outlet of the water treatment device is connected with a second booster pump, the water inlet of the preheater is connected with the second booster pump, the water outlet of the preheater is connected with the water inlet of the steam injection boiler, a bypass valve is arranged between the water inlet and the water outlet of the preheater, and the cold source inlet and outlet of the condenser are connected with the air separation device. The water outlet of the preheater is connected with the water inlet of the steam injection boiler, the air outlet of the air separation device is divided into two paths, the N2 pipeline is connected with each instrument using instrument air, and the O2 pipeline is connected with the air inlet of the gas mixing device; the steam condensate of the air separation device is connected with the inlet of the second booster pump as boiler feed water.

2. A boiler, characterized by: The CO2 capture and storage system of the oil displacement steam injection boiler comprises a tank body (1). A manhole assembly (2) is connected to the upper end of the outer wall of the tank body (1). A hot gas conveying assembly (3) is connected to the middle part of the tank body (1). The manhole assembly (2) comprises a manhole sealing piece (21), the upper end of the side wall of the tank body (1) is connected with the manhole sealing piece (21), the upper end of the manhole sealing piece (21) is connected with a first sealing dismounting piece (22), the lower end of the manhole sealing piece (21) is connected with a second sealing locking piece (23), and the middle part of the second sealing locking piece (23) is connected with a second sealing switching piece (24).

3. A boiler as claimed in claim 2, characterised in that: The manhole sealing piece (21) comprises a manhole (211), the upper end of the side wall of the tank body (1) is provided with the manhole (211), a sealing groove (212) is formed in the inner wall of the manhole (211), a sealing cylinder (213) is clamped to the middle part of the manhole (211), an air bag (214) is fixedly connected to the outer side wall of the sealing cylinder (213), the air bag (214) is in communication with the inside of the sealing cylinder (213) through a gas permeation hole, and an inflation hole (215) is formed in the bottom plate of the sealing cylinder (213).

4. A boiler as claimed in claim 3, characterised in that: The first sealing dismounting part (22) comprises a first locking plate (223), the top of the sealing cylinder (213) is fixedly connected with the first locking plate (223), a plurality of groups of first locking sliding grooves (224) are formed in the outer side of the upper end of the first locking plate (223), first locking insertion columns (225) are slidably connected in the interiors of the first locking sliding grooves (224), first limiting sliding blocks (226) are fixedly connected to the tops of the first locking insertion columns (225), a first driving rotating plate (221) is slidably connected to the top of the first locking plate (223), first limiting sliding grooves (228) are formed in the lower ends of the first driving rotating plate (221) above the first limiting sliding blocks (226), the upper ends of the first limiting sliding blocks (226) are slidably connected in the first limiting sliding grooves (228), the first driving rotating plate (221) and the first locking plate (223) are provided with first air holes (222) corresponding one by one in upward and downward directions, first locking insertion grooves (227) are formed in the inner walls of the manholes (211) outside the first locking insertion columns (225), and the ends of the first locking insertion columns (225) away from each other are inserted into the first locking insertion grooves (227).

5. The boiler of claim 4, wherein: The second sealing locking part (23) comprises a second locking plate (231), the bottom of the sealing cylinder (213) is contactingly connected with the second locking plate (231), a plurality of groups of second locking sliding grooves (232) are formed in the outer side of the lower end of the second locking plate (231), second locking insertion columns (233) are slidably connected in the interiors of the second locking sliding grooves (232), second limiting sliding blocks (234) are fixedly connected to the bottoms of the second locking insertion columns (233), a plurality of groups of second air holes (236) are formed in the second locking plate (231), air pipes (237) are fixedly connected to the top of the second locking plate (231) above the second air holes (236), the upper ends of the air pipes (237) are inserted into the inflation holes (215), second locking insertion grooves (235) are formed in the interiors of the manholes (211) outside the second locking insertion columns (233), and the outer sides of the second locking insertion columns (233) are inserted into the second locking insertion grooves (235).

6. A boiler as claimed in claim 5, characterised in that: The second sealing switch piece (24) comprises a second driving rotating plate (241), the bottom of the second locking plate (231) is in contact connection with the second driving rotating plate (241), a plurality of groups of second limiting sliding grooves (242) are formed in the outer end of the second driving rotating plate (241), the lower ends of the second limiting sliding blocks (234) are all in sliding connection in the second limiting sliding grooves (242), a plurality of groups of third air holes (244) are formed in the second driving rotating plate (241), the top of the second driving rotating plate (241) is fixedly connected with a driving rotating rod (243), the upper end of the driving rotating rod (243) penetrates through the second locking plate (231), the sealing barrel (213), the first locking plate (223) and the first driving rotating plate (221), and the driving rotating rod (243) is in rotary connection with the second locking plate (231), the sealing barrel (213), the first locking plate (223) and the first driving rotating plate (221).

7. A boiler as claimed in claim 6, characterised in that: When the first locking column (225) is separated from the first locking slot (227), the first driving rotating plate (221) is in communication with the first air hole (222) on the first locking plate (223).

8. A boiler as claimed in claim 7, characterised in that: When the second locking column (233) is separated from the second locking slot (235), the third air hole (244) is in communication with the air pipe (237) and the second air hole (236).

9. A boiler as claimed in claim 8, characterised in that: The hot gas conveying assembly (3) comprises first isolation plates (31), the left and right ends of the inside of the tank body (1) are fixedly connected with the first isolation plates (31), a plurality of groups of air supply pipes (32) are fixedly connected between the two groups of first isolation plates (31), the left side wall of the left first isolation plate (31) is fixedly connected with a second isolation plate (33), and the second isolation plate (33) divides the space, which is separated by the left first isolation plate (31), into two parts.

Images