Full-premixing steam boiler

Abstract

The invention belongs to the technical field of boilers, and particularly relates to a full-premixing steam boiler which comprises a pressure-bearing outer container, supporting legs, a full-premixing device, a boiler cover and a gas drying device. Supporting legs are arranged at the bottom of the pressure-bearing outer container, a full premixing device is arranged in the pressure-bearing outer container, a gas drying device is arranged at the position, located above the full premixing device, in the pressure-bearing outer container, and a furnace cover is detachably arranged at the top of the pressure-bearing outer container. The venturi fan is adopted, negative pressure generated by high-speed airflow is utilized, air is sucked in through the air inlet pipe and then fully mixed with natural gas input into the natural gas inlet pipe, and the mixed gas is discharged into the combustion cavity through the combustor and is ignited and combusted through the ignition system; natural gas and oxygen in air are mixed in advance and then combusted, it is guaranteed that the natural gas can be fully combusted in the later period, and the situation that a large amount of harmful gas is generated due to incomplete combustion of the natural gas and energy waste is caused by insufficient utilization of the natural gas is effectively avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a full premixed steam boiler. Background Art

[0002] As an important thermal power equipment, steam boilers are widely used in many fields such as industrial production, central heating and civil life. In industrial production, such as the textile printing and dyeing industry, steam is needed to perform heat setting and dyeing processes on fabrics; the food processing industry relies on steam to cook and sterilize food; the chemical industry uses steam to heat materials, react, distill and separate materials. In the field of central heating, steam boilers provide the heat energy required for heating large commercial buildings, residential areas, etc. in the city. In civil life, in places such as hotels and hospitals, steam is used to provide hot water, kitchen cooking and disinfection.

[0003] Most of the existing steam boilers add gas while burning, which results in the inability to maintain sufficient fuel when the gas enters the combustion chamber. Incomplete combustion not only reduces fuel utilization and increases the company's production costs, but also greatly increases some harmful smoke generated by incomplete combustion of fuel in the combustion chamber, which pollutes the air on the one hand, and on the other hand, a large amount of smoke generated by incomplete combustion of fuel will accelerate the attachment to the outer wall of the pressure inner tube, resulting in a decrease in the thermal conductivity of the pressure inner tube and a decrease in the internal heat transfer efficiency. The pressure inner tube is mostly arranged inside the pressure outer tube, and the traditional pressure inner tube is not convenient to disassemble and clean. At the same time, the water content in the steam of traditional steam boilers is relatively high, which affects the later use.

[0004] In summary, the present invention provides a full premixed steam boiler. Summary of the invention

[0005] In view of the above problems, an embodiment of the present application provides a fully premixed steam boiler to solve the problems of incomplete fuel combustion inside the steam boiler, low internal heat utilization efficiency and high water content in the steam.

[0006] In order to achieve the above-mentioned objectives, the embodiments of the present application provide the following technical solutions: a fully premixed steam boiler, comprising a pressure-bearing outer tank, supporting legs, a fully premixing device, a furnace cover and a gas drying device; supporting legs are arranged at the bottom of the pressure-bearing outer tank; a fully premixing device is arranged inside the pressure-bearing outer tank, a gas drying device is arranged inside the pressure-bearing outer tank above the fully premixing device, and a furnace cover is detachably arranged on the top of the pressure-bearing outer tank.

[0007] The full premixing device comprises a natural gas inlet pipe, a solenoid valve, a venturi blower, an air inlet pipe, a natural gas outlet pipe, a metal sleeve, an ignition system and a burner; the metal sleeve is fixedly mounted on the bottom inner wall of the pressure-bearing outer tank by bolts, the peripheral outer wall of the metal sleeve is provided with an ignition system, the upper end of the metal sleeve is connected with a burner, the lower end of the metal sleeve is connected with a natural gas outlet pipe, the lower end of the natural gas outlet pipe is connected with a venturi blower, and the side wall of the venturi blower is connected with the air inlet pipe, the venturi blower is provided with a natural gas inlet pipe, and a solenoid valve is provided in the middle of the natural gas inlet pipe.

[0008] A combustion chamber is arranged in the middle of the pressure-bearing outer shell, a smoke utilization chamber is arranged inside the pressure-bearing outer shell, and a smoke hood is arranged between the smoke utilization chamber and the combustion chamber to separate them, a spirally arranged fin coil welded by integrated laser is arranged inside the smoke utilization chamber, and a water inlet pipe is arranged at the inlet position of the fin coil.

[0009] The gas drying device includes a steam hood cylinder arranged on the inner wall of the top end of the fume hood, a steam inner cylinder and a steam outer cylinder are fixedly arranged inside the steam hood cylinder, and the steam inner cylinder and the steam outer cylinder are coaxially arranged, and a spirally arranged air guide plate is arranged between the inner walls of the steam inner cylinder and the steam outer cylinder; a spiral air guide pipe is also arranged inside the steam inner cylinder; a conducting pipe is arranged at the top end of the steam hood cylinder, and the conducting pipe is sleeved on the outside of the air outlet of the spiral air guide pipe.

[0010] According to a favorable embodiment, the burner is vertically arranged in the middle position of the combustion chamber, and three pressure-bearing inner tubes are evenly arranged inside the combustion chamber and distributed around the burner, and the upper ends of the three pressure-bearing inner tubes are connected to the gas drying device; a smoke inlet hood is also arranged at the lower end of the smoke hood, and an air inlet hole connected to the combustion chamber is opened on the side wall of the smoke inlet hood, and a smoke guide hole connected to the smoke inlet hood is also arranged at the lower end of the smoke hood; a smoke exhaust pipe connected to the smoke utilization chamber is also arranged on the side wall of the pressure outer tank, and a smoke processor is arranged on the smoke exhaust pipe.

[0011] According to a favorable embodiment, the water inlet pipe passes through the outer wall of the pressure outer tank, is located outside the pressure outer tank and is connected to an external water pump; the outlet position of the fin coil is connected to a water outlet pipe, and the water outlet pipe is connected to a water distribution system, the water distribution system is connected to the top ends of the three pressure inner tubes, and the water distribution system is arranged inside the pressure outer tank.

[0012] According to a favorable embodiment, the water distribution system includes a water storage pan arranged inside the pressure-bearing outer tank, a water conduit is opened inside the water storage pan, the water conduit is connected to the water outlet pipe, a water hole is opened on the water storage pan for the pressure-bearing inner tube to pass through, a heat-resistant sealing ring is arranged inside the water hole, and the heat-resistant sealing ring is sleeved on the outer wall of the pressure-bearing inner tube, and the pressure-bearing inner tube, the heat-resistant sealing ring and the water conduit are connected.

[0013] According to an advantageous embodiment, a gas valve for discharging hot steam inside the pressure-bearing inner tube is provided inside the top end thereof; and a gas pressure display for detecting the gas pressure inside the gas drying device is provided at the upper end of the furnace cover.

[0014] According to a favorable embodiment, the bottom end of the steam hood is an inverted cone structure; the outside of the steam outer tube is evenly provided with air guide components connected to its interior; the number of air guide components corresponds one-to-one to the pressure-bearing inner tube, and the air guide components are plugged and connected to the upper end of the pressure-bearing inner tube.

[0015] According to a favorable embodiment, a drainage pipe is provided in communication with the inner wall of the bottom end of the steam hood, and the other end of the drainage pipe is located outside the pressure-bearing outer tank.

[0016] According to a favorable embodiment, the air guide assembly includes an L-shaped air pipe arranged on the outer wall of the steam outer cylinder through an ear seat, and the upper end of the L-shaped air pipe is connected to the gap between the steam outer cylinder and the steam inner cylinder; the lower end of the L-shaped air pipe is connected to a heat-resistant sealing plug cylinder, and the heat-resistant sealing plug cylinder is plugged and sealed with the upper end of the pressure inner tube.

[0017] According to a favorable embodiment, the pressure-bearing inner tube is arranged inside the pressure-bearing outer tube by a clamping manner, and a water storage chamber is arranged inside the pressure-bearing inner tube, and the lower end of the pressure-bearing inner tube is evenly provided with positioning blocks that move along its radial direction in a movable manner, and the positioning blocks are connected to the lower end of the pressure-bearing inner tube by a spring; several positioning blocks are matched with positioning bolts threadedly connected to the lower end of the pressure-bearing inner tube.

[0018] Compared with the prior art, the fully premixed steam boiler provided in the embodiment of the present invention has the following beneficial effects:

[0019] 1. The present invention adopts a Venturi blower to utilize the negative pressure generated by high-speed airflow, and the air is sucked in through the air inlet pipe and fully mixed with the natural gas input from the natural gas inlet pipe. The mixed gas is discharged into the combustion chamber through the burner and ignited and burned through the ignition system. By mixing the natural gas and the oxygen in the air in advance and then burning them, it is ensured that the natural gas can be fully burned in the later stage, and the generation of a large amount of harmful gases due to incomplete combustion of natural gas and the energy waste caused by insufficient utilization of natural gas are effectively avoided.

[0020] 2. The present invention firstly adopts the method of fully premixing gas and air to improve the fuel combustion rate, and at the same time combines the method of preheating flue gas with water to reduce the gas consumption and improve the heating effect of the boiler; the method of fully premixing gas can effectively reduce the generation of harmful gases and a large amount of smoke caused by insufficient fuel combustion, thereby reducing the smoke adhesion on the surface of the pressure inner tube and ensuring the internal heat transfer efficiency; at the same time, the pressure inner tube is arranged in a way that the inside of the pressure outer tube can be disassembled and drawn out, which facilitates the cleaning of surface dirt on the pressure inner tube in the later stage.

[0021] 3. The discharged steam in the present invention descends along the spirally arranged air guide plate and then rises and is discharged along the spiral air guide pipe. In the process of the steam spirally descending and spirally rising, the moisture in the steam will drip along the air guide plate and the air guide pipe to the bottom wall of the steam hood due to the action of centrifugal force and be discharged to the outside of the pressure outer tank through the drainage pipe; the dryness of the gas is effectively guaranteed, and at the same time, the cold air introduced through the inside of the guide pipe further condenses with the moisture in the steam, thereby fully reducing the moisture content in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 It is a cross-sectional view of the internal structure of the pressure-bearing outer bladder of the present invention.

[0024] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0025] Figure 4 It is a three-dimensional structural diagram of the full premixing device of the present invention.

[0026] Figure 5 It is a three-dimensional structural schematic diagram of the fin coil of the present invention.

[0027] Reference numerals in the figure: 1. pressure-bearing outer liner; 2. supporting feet; 3. full premixing device; 4. furnace cover; 5. gas drying device; 31. natural gas inlet pipe; 32. solenoid valve; 33. venturi blower; 34. air inlet pipe; 35. natural gas outlet pipe; 36. metal sleeve; 37. ignition system; 38. burner; 11. combustion chamber; 12. pressure-bearing inner tube; 121. water storage chamber; 122. positioning block; 123. positioning bolt; 13. flue gas utilization chamber; 131. fin plate Pipe; 132, water inlet pipe; 133, water outlet pipe; 14, smoke hood; 15, smoke inlet hood; 16, smoke exhaust pipe; 17, smoke processor; 18, water distribution system; 181, water storage tray; 182, heat-resistant sealing ring; 183, air valve; 51, steam hood cylinder; 52, steam inner cylinder; 53, steam outer cylinder; 54, air guide plate; 55, air guide assembly; 551, L-shaped air pipe; 552, heat-resistant sealing plug cylinder; 511, drain pipe; 521, spiral air guide pipe; 522, conducting pipe. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 This application is further described in detail.

[0029] Please refer to Figure 1 A full premixing steam boiler comprises a pressure outer shell 1, supporting legs 2, a full premixing device 3, a furnace cover 4 and a gas drying device 5; the pressure outer shell 1 is provided with supporting legs 2 at the bottom; the pressure outer shell 1 is provided with the full premixing device 3, the pressure outer shell 1 is provided with the gas drying device 5 above the full premixing device 3, and the top of the pressure outer shell 1 is detachably provided with the furnace cover 4; the natural gas introduced into the full premixing device 3 is fully mixed with oxygen in the air, and then discharged into the pressure outer shell 1 to heat the water introduced into the pressure outer shell 1 to generate steam, and the generated steam is dried by the gas drying device 5.

[0030] Please refer to Figure 4 The full premixing device 3 includes a natural gas inlet pipe 31, a solenoid valve 32, a venturi fan 33, an air inlet pipe 34, a natural gas outlet pipe 35, a metal sleeve 36, an ignition system 37 and a burner 38; the metal sleeve 36 is fixedly installed on the bottom inner wall of the pressure-bearing outer liner 1 by bolts, and the ignition system 37 is arranged on the peripheral outer wall of the metal sleeve 36, the upper end of the metal sleeve 36 is connected with the burner 38, the lower end of the metal sleeve 36 is connected with the natural gas outlet pipe 35, the lower end of the natural gas outlet pipe 35 is connected with the venturi fan 33, and the side wall of the venturi fan 33 is connected with the air inlet pipe 34, the natural gas inlet pipe 31 is arranged on the venturi fan 33, and the solenoid valve 32 is arranged in the middle of the natural gas inlet pipe 31.

[0031] Before use, the natural gas inlet pipe 31 is connected to the gas tank outlet, and the air intake of the natural gas inlet pipe 31 is controlled by the solenoid valve 32. The incoming natural gas is fully mixed with the oxygen in the air by the Venturi blower 33 and sent to the position of the burner 38, and ignited by the ignition system 37 (this is the prior art). The natural gas and the oxygen in the air are mixed in advance by the set full premixing device 3, which ensures subsequent full combustion, avoids incomplete combustion to generate harmful gases and causes insufficient utilization of the fuel gas.

[0032] Please refer to Figure 2 and Figure 5 A combustion chamber 11 is provided in the middle of the pressure-bearing outer tank 1, a flue gas utilization chamber 13 is provided inside the pressure-bearing outer tank 1, and a flue gas hood 14 is provided between the flue gas utilization chamber 13 and the combustion chamber 11 to separate them, and a spirally arranged finned coil 131 which is welded by integrated laser is provided inside the flue gas utilization chamber 13, and a water inlet pipe 132 is provided at the inlet position of the finned coil 131; the flue gas utilization chamber 13 is provided to fully recycle the heat in the flue gas, and the cold water is preheated, which greatly improves the energy utilization rate and reduces the fuel cost; the setting of the finned coil 131 increases the contact area between the flue gas and the finned coil 131, and effectively improves the heat transfer effect in the flue gas; when in use, the water inlet pipe 132 needs to be connected to an external water pump, and water is supplied to the inside along the water inlet pipe 132 through the water pump.

[0033] Please refer to Figure 2 and Figure 3 The gas drying device 5 includes a steam hood tube 51 arranged on the inner wall of the top end of the fume hood 14, and a steam inner tube 52 and a steam outer tube 53 are fixedly arranged inside the steam hood tube 51, and the steam inner tube 52 and the steam outer tube 53 are coaxially arranged, and a spirally arranged air guide sheet 54 is arranged between the inner walls of the steam inner tube 52 and the steam outer tube 53; a spiral air guide pipe 521 is also arranged inside the steam inner tube 52; a conducting pipe 522 is arranged at the top end of the steam hood tube 51, and the conducting pipe 522 is sleeved on the outside of the air outlet of the spiral air guide pipe 521.

[0034] Please refer to Figure 3 The outside of the steam outer cylinder 53 is evenly provided with air guide components 55 connected with the inside thereof; the number of the air guide components 55 corresponds one to one with the pressure inner tube 12, and the air guide components 55 are plugged and connected with the upper end of the pressure inner tube 12.

[0035] Please refer to Figure 3The air guide component 55 includes an L-shaped air pipe 551 arranged on the outer wall of the steam outer cylinder 53 through an ear seat, and the upper end of the L-shaped air pipe 551 is connected to the gap between the steam outer cylinder 53 and the steam inner cylinder 52; the lower end of the L-shaped air pipe 551 is connected to a heat-resistant sealing plug cylinder 552, and the heat-resistant sealing plug cylinder 552 is plugged and sealed with the upper end of the pressure inner tube 12.

[0036] The steam enters the gap between the inner walls of the steam inner tube 52 and the steam outer tube 53 through the L-shaped air pipe 551 and is then centrifugally transmitted along the air guide plate 54; the heat-resistant sealing plug 552 is provided to facilitate the disassembly or replacement of the pressure inner tube 12, ensuring that the upper end of the pressure inner tube 12 and the L-shaped air pipe 551 remain tightly connected to avoid steam leakage.

[0037] Please refer to Figure 1 and Figure 2 The burner 38 is vertically arranged in the middle position of the combustion chamber 11, and three pressure-bearing inner tubes 12 are evenly arranged inside the combustion chamber 11 and distributed around the burner 38. The upper ends of the three pressure-bearing inner tubes 12 are connected to the gas drying device 5; the lower end of the smoke hood 14 is also provided with a smoke inlet hood 15, and the side wall of the smoke inlet hood 15 is provided with an air inlet hole connected to the combustion chamber 11, and the lower end of the smoke hood 14 is also provided with a smoke guide hole connected to the smoke inlet hood 15; the side wall of the pressure outer tank 1 is also provided with a smoke exhaust pipe 16 connected to the smoke utilization chamber 13, and a smoke processor 17 is provided on the smoke exhaust pipe 16.

[0038] After the heat in the flue gas is fully utilized, it will eventually be discharged along the exhaust pipe 16, and the flue gas will pass through the flue gas processor 17 for flue gas purification during the process of passing through the exhaust pipe 16; the pressure inner tube 12 is distributed circumferentially on the peripheral side of the burner 38 to improve the internal heat transfer efficiency.

[0039] Please refer to Figure 2 The pressure-bearing inner tube 12 is arranged inside the pressure-bearing outer liner 1 by a clamping method, and a water storage chamber 121 is arranged inside the pressure-bearing inner tube 12. The lower end of the pressure-bearing inner tube 12 is evenly provided with positioning blocks 122 that move along its radial direction in a movable manner, and the positioning blocks 122 are connected to the lower end of the pressure-bearing inner tube 12 by a spring; a plurality of positioning blocks 122 are matched with positioning bolts 123 threadedly connected to the lower end of the pressure-bearing inner tube 12.

[0040] When replacing the pressure-bearing inner tube 12, first close the water valve between the external water pump and the water inlet pipe 132, then unscrew the positioning bolt 123, and use the rebound force of the spring to drive the positioning block 122 to separate from the pressure-bearing outer tank 1, and then pull out the pressure-bearing inner tube 12 downward, so as to clean the dust on the surface of the pressure-bearing inner tube 12 or replace it with a new one.

[0041] Please refer to Figure 2 and Figure 3 The water inlet pipe 132 passes through the outer wall of the pressure-bearing outer tank 1, is located outside the pressure-bearing outer tank 1, and is connected to the external water pump; the outlet position of the fin coil 131 is connected to the outlet pipe 133, and the outlet pipe 133 is connected to the water distribution system 18, which is connected to the top of the three pressure-bearing inner tubes 12, and the water distribution system 18 is arranged inside the pressure-bearing outer tank 1. The water flowing into the water inlet pipe 132 enters the fin coil 131, and the cold water in the fin coil 131 is preheated by the flue gas, and then flows into the water distribution system 18 along the outlet pipe 133 and finally diverted to the water storage chamber 121.

[0042] Please refer to Figure 3 The water distribution system 18 includes a water storage tray 181 disposed inside the pressure-bearing outer tank 1, a water conduit is provided inside the water storage tray 181, and the water conduit is connected to the water outlet pipe 133. A water hole is provided on the water storage tray 181 for the pressure-bearing inner tube 12 to pass through, and a heat-resistant sealing ring 182 is provided inside the water hole, and the heat-resistant sealing ring 182 is sleeved on the outer wall of the pressure-bearing inner tube 12. The pressure-bearing inner tube 12, the heat-resistant sealing ring 182 and the water conduit are connected. After being preheated by the flue gas, the external cold water enters the water storage tray 181 along the water outlet pipe 133, and finally enters the water storage chamber 121 through the internal water conduit; the purpose of the heat-resistant sealing ring 182 is to ensure the sealing of the connection between the pressure-bearing inner tube 12 and it.

[0043] Please refer to Figure 1 and Figure 3 The top of the pressure inner tube 12 is provided with a gas valve 183 for discharging the hot steam therein; the upper end of the furnace cover 4 is provided with a gas pressure display for detecting the gas pressure inside the gas drying device 5. The gas valve 183 is a prior art, and its purpose is to maintain the internal pressure of the water storage chamber 121 to a certain state, so as to facilitate the escape of the heated steam and avoid the explosion and damage of the pressure inner tube 12 caused by excessive internal pressure.

[0044] Please refer to Figure 2 The bottom end of the steam hood 51 is an inverted cone structure; the inner wall of the bottom end of the steam hood 51 is connected to a drain pipe 511, and the other end of the drain pipe 511 is located outside the pressure-bearing outer tank 1; the inverted cone structure is convenient for the water separated from the internal steam to be concentrated and diverted to the outside through the drain pipe 511.

[0045] When using a fully premixed steam boiler, first connect the natural gas inlet pipe 31 to the gas tank outlet, then connect the water pump to the water inlet pipe 132, control a certain amount of water to flow into the water storage chamber 121, and then control the air intake of the solenoid valve 32. The natural gas entering is fully mixed with oxygen in the air by the venturi blower 33 and then sent to the position of the burner 38, and ignited by the ignition system 37, so as to continuously heat the water inside the water storage chamber 121 to keep it boiling and generate steam; the generated steam is dried by the gas drying device 5, and then the water in the water storage chamber 121 is regularly replenished, and the replenished water is preheated by the flue gas in advance.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A full premix steam boiler, comprising a pressure-bearing outer shell (1), a full premix device (3), a furnace cover (4) and a gas drying device (5); characterized in that: A full premixing device (3) is arranged inside the pressure-bearing outer container (1), a gas drying device (5) is arranged above the full premixing device (3) inside the pressure-bearing outer container (1), and a furnace cover (4) is detachably arranged on the top of the pressure-bearing outer container (1); wherein: The full premixing device (3) comprises a metal sleeve (36); the metal sleeve (36) is fixedly mounted on the bottom inner wall of the pressure-bearing outer bladder (1) by means of bolts; an ignition system (37) is arranged on the peripheral outer wall of the metal sleeve (36); the upper end of the metal sleeve (36) is connected to a burner (38); the lower end of the metal sleeve (36) is connected to a natural gas outlet pipe (35); the lower end of the natural gas outlet pipe (35) is connected to a venturi fan (33); and the side wall of the venturi fan (33) is connected to an air inlet pipe (34); the venturi fan (33) is provided with a natural gas inlet pipe (31); and a solenoid valve (32) is arranged in the middle of the natural gas inlet pipe (31); A combustion chamber (11) is provided in the middle of the pressure-bearing outer shell (1), a smoke utilization chamber (13) is provided inside the pressure-bearing outer shell (1), and a smoke cover (14) is provided between the smoke utilization chamber (13) and the combustion chamber (11) to separate them, a finned coil (131) is provided inside the smoke utilization chamber (13), and a water inlet pipe (132) is provided at the inlet position of the finned coil (131); The gas drying device (5) comprises a steam hood tube (51) arranged on the inner wall of the top end of the fume hood (14); a coaxially arranged steam inner tube (52) and a steam outer tube (53) are fixedly arranged inside the steam hood tube (51); a spirally arranged air guide plate (54) is arranged between the inner walls of the steam inner tube (52) and the steam outer tube (53); and a spiral air guide pipe (521) is arranged inside the steam inner tube (52).

2. A fully premixed steam boiler according to claim 1, characterized in that: The burner (38) is vertically arranged in the middle of the combustion chamber (11), and three pressure-bearing inner tubes (12) are evenly arranged inside the combustion chamber (11) and distributed around the burner (38), and the upper ends of the three pressure-bearing inner tubes (12) are connected to the gas drying device (5); the lower end of the smoke hood (14) is also provided with a smoke inlet hood (15), and the side wall of the smoke inlet hood (15) is provided with an air inlet hole connected to the combustion chamber (11), and the lower end of the smoke hood (14) is also provided with a smoke guide hole connected to the smoke inlet hood (15); the side wall of the pressure-bearing outer shell (1) is also provided with a smoke exhaust pipe (16) connected to the smoke utilization chamber (13), and a smoke processor (17) is provided on the smoke exhaust pipe (16).

3. A fully premixed steam boiler according to claim 2, characterized in that: The water inlet pipe (132) passes through the outer wall of the pressure-bearing outer tank (1), is located outside the pressure-bearing outer tank (1), and is connected to an external water pump; the outlet position of the finned coil (131) is connected to a water outlet pipe (133), and the water outlet pipe (133) is connected to a water distribution system (18), the water distribution system (18) is connected to the top ends of the three pressure-bearing inner tubes (12), and the water distribution system (18) is arranged inside the pressure-bearing outer tank (1).

4. A fully premixed steam boiler according to claim 3, characterized in that: The water distribution system (18) comprises a water storage tray (181) arranged inside the pressure-bearing outer liner (1), a water conduit is provided inside the water storage tray (181), the water conduit is connected to the water outlet pipe (133), a water through hole is provided on the water storage tray (181) for the pressure-bearing inner tube (12) to pass through, a heat-resistant sealing ring (182) is provided inside the water through hole, and the heat-resistant sealing ring (182) is sleeved on the outer wall of the pressure-bearing inner tube (12), and the pressure-bearing inner tube (12), the heat-resistant sealing ring (182) and the water conduit are connected.

5. A fully premixed steam boiler according to claim 2, characterized in that: A gas valve (183) for discharging hot steam inside the pressure-bearing inner tube (12) is arranged inside the top end thereof; and a gas pressure display for detecting the gas pressure inside the gas drying device (5) is arranged at the upper end of the furnace cover (4).

6. A fully premixed steam boiler according to claim 2, characterized in that: The bottom end of the steam hood cylinder (51) is an inverted cone structure; the outside of the steam outer cylinder (53) is evenly provided with air guide components (55) connected to the inside thereof; the number of the air guide components (55) corresponds to the number of the pressure-bearing inner tube (12), and the air guide components (55) are plugged and connected to the upper end of the pressure-bearing inner tube (12).

7. A fully premixed steam boiler according to claim 1, characterized in that: A drainage pipe (511) is provided in communication with the inner wall of the bottom end of the steam hood (51), and the other end of the drainage pipe (511) is located outside the pressure-bearing outer liner (1).

8. A fully premixed steam boiler according to claim 6, characterized in that: The air guide assembly (55) comprises an L-shaped air pipe (551) arranged on the outer wall of the steam outer cylinder (53) through an ear seat, the upper end of the L-shaped air pipe (551) is connected to the gap between the steam outer cylinder (53) and the steam inner cylinder (52); the lower end of the L-shaped air pipe (551) is connected to a heat-resistant sealing plug cylinder (552), and the heat-resistant sealing plug cylinder (552) is plugged and sealed with the upper end of the pressure-bearing inner tube (12).

9. A fully premixed steam boiler according to claim 2, characterized in that: The pressure-bearing inner tube (12) is arranged inside the pressure-bearing outer liner (1) by means of a clamping connection, and a water storage chamber (121) is arranged inside the pressure-bearing inner tube (12). Positioning blocks (122) that move along the radial direction are evenly arranged at the lower end of the pressure-bearing inner tube (12) in a movable manner, and the positioning blocks (122) are connected to the lower end of the pressure-bearing inner tube (12) by a spring; and a plurality of positioning blocks (122) are matched with positioning bolts (123) that are threadedly connected to the lower end of the pressure-bearing inner tube (12).

10. A fully premixed steam boiler according to claim 1, characterized in that: A conducting pipe (522) is provided at the top of the steam hood tube (51), and the conducting pipe (522) is sleeved on the outside of the air outlet of the spiral air conducting pipe (521); and a supporting foot (2) is provided at the bottom of the pressure-bearing outer bladder (1).

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