Sleeve low-nitrogen gas steam generator

Abstract

The utility model relates to the technical field of steam generators, and discloses a sleeve low-nitrogen fuel gas steam generator which comprises a machine shell, an inner container body, an energy saver, a low-nitrogen burner, an inner container support, a water supply assembly, a liquid level detection assembly and a pressure gauge elbow, and the inner container body, the energy saver, the low-nitrogen burner, the inner container support, the water supply assembly, the liquid level detection assembly and the pressure gauge elbow are arranged in the machine shell. The effective water volume of the inner container body is smaller than 30 L, the inner container body and the energy saver are arranged in the machine shell side by side, the inner container body is arranged on the top of the inner container support, the energy saver is externally connected with a softened water tank, and the low-nitrogen burner is arranged at the bottom of the inner container body. According to the sleeve low-nitrogen gas steam generator, the steam generation efficiency of the steam generator can be improved, the utilization rate of heat energy is greatly improved, the production cost is low, heat supply of the steam generator is guaranteed, the heat absorption efficiency of the steam generator is improved, the smoke exhaust temperature is reduced, and pollutant emission is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam generator technical field, concretely relates to a casing low nitrogen gas steam generator. BACKGROUND

[0002] The boiler is a kind of energy conversion equipment, the energy input to the boiler has chemical energy in fuel, electric energy, the boiler exports steam, high-temperature water or organic heat carrier with certain heat energy, the original meaning of pot refers to the water container heated on fire, furnace refers to the place of burning fuel, boiler includes pot and furnace two parts, pot is the pressure component of water and steam, water is heated, vaporized and steam-water separation, furnace is the place of burning fuel or other heat release, there is burning equipment and combustion chamber furnace and heat release flue etc., pot and furnace carry out heat conversion process, the interface of heat release and heat absorption is called heating surface, boiler heats water into steam, in addition to pot and furnace, there are framework, platform, staircase, combustion, slagging, smoke flue, pipeline, furnace wall and other auxiliary equipment, hot water or steam generated in boiler can directly provide required heat energy for industrial production and people's life, or through steam power device conversion mechanical energy, or again through generator converts mechanical energy into electric energy, the boiler that provides hot water is called hot water boiler, mainly used for life, there is also a small amount of application in industrial production, the boiler that generates steam is called steam boiler, commonly referred to as boiler, mostly used in thermal power station, ship, locomotive and industrial and mining enterprises, the main working principle of boiler is a kind of heat energy released after using fuel combustion or industrial production heat transfer to the water in container, so that water reaches the required temperature or certain pressure steam heat equipment, boiler carries out simultaneously in "pot" and "furnace" two parts, after water enters boiler, in steam-water system, boiler heating surface will absorb the heat transferred to water, so that water is heated to a certain temperature and pressure hot water or steam is generated, is led out and applied, in combustion equipment part, fuel combustion continuously releases heat, high-temperature flue gas produced by combustion gradually reduces the temperature by heat propagation, and heat is transferred to boiler heating surface, and the temperature gradually decreases, finally discharged by chimney.

[0003] The existing ordinary boiler boiler effective water volume is greater than or equal to 30L, the defect that need professional boiler worker carries out operation, the efficiency of generating steam is slow, the manufacturing cost is high and the utilization rate of heat energy is low, a large amount of heat energy is easy to be discharged to outside to cause the problem of resource waste. SUMMARY

[0004] In order to solve the problems existing in the prior art, the utility model aims at providing a casing low nitrogen gas steam generator.

[0005] The utility model relates to a kind of sleeve low-nitrogen gas steam generator, including shell and the inner container body being set to the inside of the shell, economizer, low-nitrogen combustor, inner container support, water supply component, liquid level detection component and pressure gauge bend, the outside of the shell is provided with electric cabinet, the effective water volume of the inner container body is less than 30L, the inner container body is arranged in parallel with the economizer in the shell, the inner container body is set to the top of the inner container support, the economizer is connected with soft water tank, the low-nitrogen combustor is set to the bottom of the inner container body, the smoke outlet of the inner container body is communicated with the smoke inlet of the economizer, the flue gas generated by the low-nitrogen combustor is added into the economizer from the smoke outlet and the smoke inlet, to heat the soft water in the economizer, the water supply component is communicated with the inner container body and the economizer, the water supply component is used to add the soft water in the economizer into the inner container body, the pressure gauge bend is communicated with inner container body, three joints are set on the pressure gauge bend and are respectively connected with pressure gauge, pressure controller and pressure transmitter, the liquid level detection component is communicated with inner container body, steam pipe seat and safety pipe seat are set on the inner container body, steam valve and safety valve are respectively set on the steam pipe seat and the safety pipe seat.

[0006] Preferably, the inner container body includes an upper smoke box, an upper cylinder, a tube plate one, a tube plate two, a tube plate three, a tube plate four, a tube plate five, and a lower cylinder.

[0007] The lower cylinder inner wall is sequentially fixed with the tube plate one, the tube plate two and the tube plate three from bottom to top, the smoke outlet is arranged on one side of the lower cylinder, and the opening position is between the tube plate one and the tube plate two. The lower end of the upper cylinder inner wall is fixed with the tube plate four, and the tube plate five is fixed near the end of the tube plate four. The tube plate three and the tube plate four are provided with a water pipe, a fire pipe and a finned water pipe. The fire pipe penetrates the water pipe and the finned water pipe, and the upper and lower ends thereof are fixedly connected with the tube plate five and the tube plate two, respectively. The water pipe has 16 branches and is circularly distributed. The outer side of the water pipe is provided with a water pipe sealing plate. An observation opening pipe is arranged outside the water pipe sealing plate. The combustor pipe cylinder of the low-nitrogen combustor is fixed to the lower surface of the tube plate one and penetrates the tube plate one, the tube plate two and the tube plate three in sequence upwards. The upper cylinder is sleeved with an upper smoke cylinder, which penetrates the tube plate four and the tube plate five in sequence from bottom to top. The upper smoke box is fixed to the top of the upper cylinder. The side surface of the lower cylinder is provided with a water inlet / drainage pipe seat. The water inlet end of the water inlet / drainage pipe seat is connected with one end of the water supply component. The liquid level detection component has upper and lower connecting pipe seats. The lower connecting pipe seat is arranged at the tube plate two and penetrates the lower cylinder. The upper connecting pipe seat is arranged at the tube plate three and penetrates the water pipe sealing plate. The steam pipe seat and the safety pipe seat are fixed to the tube plate five and penetrate the upper cylinder.

[0008] Preferably, the upper smoke box comprises an upper smoke box cylinder, an upper smoke box flange two, a tube plate six and two upper smoke box lifting lugs, the lower end of the upper smoke box cylinder is fixed with the upper smoke box flange two, the inner wall of the upper end of the upper smoke box cylinder is fixed with the tube plate six, the two upper smoke box lifting lugs are respectively fixed on the outer surface of the upper smoke box cylinder and the upper surface of the tube plate six, and are symmetrically distributed on both sides.

[0009] Preferably, the water inlet / drainage pipe seat comprises a water inlet / drainage pipe, the upper and lower ends of the water inlet / drainage pipe are respectively fixed with a butt flange and a drainage flange, a water inlet pipe seat is fixed near the drainage flange of the water inlet / drainage pipe, the water inlet pipe seat is in communication with one end of the water supply assembly, the drainage flange is externally connected with a drainage valve, and the butt flange is butt jointed with the side surface of the lower cylinder.

[0010] Preferably, the upper end of the combustion engine pipe cylinder is higher than the tube plate three.

[0011] Preferably, the upper end of the upper smoke cylinder is higher than the tube plate five.

[0012] Preferably, the finned water pipe is provided with a notch.

[0013] Preferably, the water supply assembly comprises a water pump arranged in the shell, a first water pipe and a second water pipe connected to the water inlet end and the water outlet end of the water pump, one end of the first water pipe and the second water pipe away from the water pump is respectively connected with the economizer and the inner container body, and two check valves are arranged on one end of the second water pipe close to the inner container body.

[0014] Preferably, the liquid level detection assembly comprises a liquid level gauge cylinder, the upper and lower ends of the liquid level gauge cylinder are respectively fixed with a probe plate and a pipe seal head, two liquid level gauge interfaces are fixed on the left side of the liquid level gauge cylinder, two liquid level gauge butt joints are fixed on the right side of the liquid level gauge cylinder, a liquid level gauge drainage port is fixed on the bottom of the pipe seal head, a water level glass tube is connected between the two liquid level gauge interfaces, three-level probes are arranged on the probe plate, and the three-level probes are inserted into the liquid level gauge cylinder.

[0015] Preferably, the economizer comprises an economizer body, the upper left side of the economizer body is provided with the smoke inlet, the lower side of the economizer body is fixed with an inspection port, the top of the economizer body is fixed with a chimney pipe, the economizer body is internally installed with a finned tube, the side of the economizer body is fixed with an economizer water tank, the economizer water tank is fixed with an economizer water inlet, an economizer water outlet, an economizer drainage port and an economizer emptying port, and the economizer water outlet is connected with the other end of the water supply assembly.

[0016] The sleeve low-nitrogen gas steam generator has the advantages that the heat energy provided by the low-nitrogen combustion machine is used to heat the inner container body, the flue gas generated by the low-nitrogen combustion machine is recycled through the energy saver, the generation efficiency of the steam generator is improved, the utilization rate of the heat energy is greatly improved, the production cost is low, the heat supply of the steam generator is ensured, the heat absorption efficiency of the steam generator is improved, the exhaust smoke temperature is reduced, and the emission of pollutants is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structure schematic view of the sleeve low-nitrogen gas steam generator of the utility model;

[0018] Figure 2 is a top view of the sleeve low-nitrogen gas steam generator of the utility model;

[0019] Figure 3 is a front view of the inner container body;

[0020] Figure 4 is a right view of the inner container body;

[0021] Figure 5 is a sectional view of A-A of the utility model; Figure 4

[0022] Figure 6 is a sectional view of the upper smoke box of the utility model;

[0023] Figure 7 is a structure schematic view of the liquid level detection assembly of the utility model;

[0024] Figure 8 is a structure schematic view of the water inlet / effluent external pipe seat of the utility model;

[0025] Figure 9 is a structure schematic view of the energy saver of the utility model;

[0026] Figure 10 is a side view of the energy saver of the utility model.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1 machine shell, 101 electric control box, 111 water pipe, 112 fire pipe, 113 fin water pipe, 114 water pipe sealing plate, 115 fire hole pipe;

[0029] ​2 inner container body, 201 steam pipe seat, 202 safety pipe seat, 203 steam valve, 204 safety valve, 21 upper smoke box, 211 upper smoke box cylinder, 212 upper smoke box flange two, 213 tube plate six, 214 upper smoke box lifting lug, 22 upper cylinder, 221 upper smoke cylinder, 23 tube plate one, 24 tube plate two, 25 tube plate three, 26 tube plate four, 27 tube plate five, 28 lower cylinder, 281 water inlet / soil pipe seat, 2811 water inlet / soil connecting pipe, 2812 butt flange, 2813 soil flange, 2814 water inlet pipe seat;

[0030] 3 energy saving device, 31 energy saving device body, 32 smoke inlet, 33 energy saving device water tank, 34 energy saving device water inlet, 35 energy saving device emptying port, 36 energy saving device water outlet, 37 energy saving device soil outlet, 38 chimney pipe, 39 finned tube, 310 maintenance port;

[0031] 4 low-nitrogen combustion machine, 41 combustion machine pipe cylinder;

[0032] 5 inner container support;

[0033] 6 water supply assembly, 61 water pump, 62 first water pipe, 63 second water pipe, 64 check valve;

[0034] 7 liquid level detection assembly, 71 liquid level gauge cylinder, 72 probe plate, 73 pipe end, 74 liquid level gauge interface, 75 liquid level gauge butt pipe seat, 76 liquid level gauge soil outlet, 77 water level glass tube, 78 three-stage probe;

[0035] 8 pressure gauge bend, 801 pressure gauge, 802 pressure controller, 803 pressure transmitter. DETAILED DESCRIPTION

[0036] As Figures 1-9As shown, the sleeve low-nitrogen gas steam generator disclosed in the embodiment comprises a shell 1, an inner container body 2, an economizer 3, a low-nitrogen burner 4, an inner container support 5, a water supply assembly 6, a liquid level detection assembly 7 and a pressure gauge bend 8 arranged in the shell 1, an electric control box 101 is arranged on the outer side of the shell 1, the effective water volume of the inner container body 2 is less than 30L, the inner container body 2 and the economizer 3 are arranged side by side in the shell 1, the inner container body 2 is arranged on the top of the inner container support 5, the economizer 3 is connected with a soft water tank, the low-nitrogen burner 4 is arranged at the bottom of the inner container body 2, the smoke outlet of the inner container body 2 is communicated with the smoke inlet of the economizer 3, the flue gas generated by the combustion of the low-nitrogen burner 4 enters the economizer 3 from the smoke outlet and the smoke inlet to heat the soft water in the economizer 3, the water supply assembly 6 is communicated with the inner container body 2 and the economizer 3, and the water supply assembly 6 is used for adding the soft water in the economizer 3 into the inner container body 2, the pressure gauge bend 8 is communicated with the inner container body 2, three joints are arranged on the pressure gauge bend 8 and correspond to a pressure gauge 801, a pressure controller 802 and a pressure transmitter 803 in communication, the liquid level detection assembly 7 is communicated with the inner container body 2, a steam pipe seat 201 and a safety pipe seat 202 are arranged on the inner container body 2, and a steam valve 203 and a safety valve 204 are arranged on the steam pipe seat 201 and the safety pipe seat 202 respectively.

[0037] The softened water enters the economizer 3 from the external soft water tank, then enters the inner container body 2 through the water supply assembly 6, passes through the low-nitrogen burner 4, forms steam, and then outputs the steam through the steam valve 203, the flue gas generated by the low-nitrogen burner 4 enters the economizer 3 to heat the softened water, energy is recycled and utilized, and the temperature of flue gas discharge is reduced. The sleeve low-nitrogen gas steam generator can accelerate the steam generation efficiency of the steam generator, greatly improve the utilization rate of heat energy, has low production cost, ensure the heat supply of the steam generator, improve the heat absorption efficiency of the steam generator, reduce the flue gas discharge temperature, and reduce the emission of pollutants.

[0038] In the embodiment, the low-nitrogen burner 4 is installed upward at the bottom of the inner container body 2, the space occupied by the steam generator is reduced, the flame and high-temperature flue gas contact the inner container through a certain path during work, the heat generated by combustion is distributed relatively uniformly, and the inner container is heated more evenly.

[0039] Please refer to Figures 2-6 , the inner container body 2 comprises an upper smoke tank 21, an upper cylinder 22, a tube plate one 23, a tube plate two 24, a tube plate three 25, a tube plate four 26, a tube plate five 27 and a lower cylinder 28;

[0040] The inner wall of the lower cylinder 28 is sequentially fixed with the tube plate one 23, the tube plate two 24 and the tube plate three 25 from bottom to top, and the smoke outlet is arranged at one side of the lower cylinder 28, and the opening position is between the tube plate one 23 and the tube plate two 24. The inner wall of the upper cylinder 22 is fixed with the tube plate four 26 at the lower end, and the tube plate five 27 is fixed at the end close to the tube plate four 26. The water pipe 111, the fire pipe 112 and the fin water pipe 113 are arranged between the tube plate three 25 and the tube plate four 26. The fire pipe 112 penetrates the water pipe 111 and the fin water pipe 113, and the upper and lower ends thereof are fixedly connected with the tube plate five 27 and the tube plate two 24 respectively. The water pipe 111 has 16 branches and is distributed in a circular shape. The outer side of the water pipe 111 is provided with the water pipe sealing plate 114. The outer side of the water pipe sealing plate 114 is provided with the fire observation opening pipe 115. The combustor pipe cylinder 41 of the low-nitrogen combustion machine 4 is fixed to the lower surface of the tube plate one 23 and penetrates the tube plate one 23, the tube plate two 24 and the tube plate three 25 in sequence upwards. The upper smoke cylinder 221 is sleeved in the upper cylinder 22 and penetrates the tube plate four 26 and the tube plate five 27 in sequence from bottom to top. The upper smoke box 21 is fixed to the top of the upper cylinder 22. The side of the lower cylinder 28 is provided with the water inlet / drainage pipe seat 281. The water inlet end of the water inlet / drainage pipe seat 281 is connected with one end of the water supply assembly 6. The liquid level detection assembly 7 has upper and lower connecting pipe seats. The lower connecting pipe seat is arranged at the tube plate two 24 and penetrates the lower cylinder 28. The upper connecting pipe seat is arranged at the tube plate three 25 and penetrates the water pipe sealing plate 114. The steam pipe seat 201 and the safety pipe seat 202 are fixed on the tube plate five 27 and penetrate the upper cylinder 22.

[0041] In the embodiment, the upper end of the combustor pipe cylinder 41 is higher than the tube plate three 25, so as to prevent the condensate water from flowing back to the low-nitrogen combustion machine 4. The upper end of the upper smoke cylinder 221 is higher than the tube plate five 27, so as to further prevent the condensate water from flowing back to the low-nitrogen combustion machine 4. The fin water pipe 113 is provided with notches, so as to increase the heated area. The intermediate layers of the fin water pipe 113 and the fire pipe 112 and the water pipe 111 and the fire pipe 112 are water layers, so as to ensure that the softened water is heated on both sides and the water volume is less than 30L. The upper smoke box 21 and the inner container body 2 are detachably fixed, so as to facilitate maintenance. The flange connection can be selected. The inner surfaces of the lower cylinder 28 and the tube plate one 23 and the lower cylinder 28 and the tube plate five 27 are paved with fire-resistant mortar, so as to heat the inner container body 2. The inner container body 2 and the inner container support 5 are fixed by screws, so as to facilitate disassembly.

[0042] Preferably, the upper smoke box 21 comprises an upper smoke box cylinder 211, an upper smoke box flange two 212, a tube plate six 213 and two upper smoke box lifting lugs 214. The lower end of the upper smoke box cylinder 211 is fixed with the upper smoke box flange two 212. The inner wall of the upper end of the upper smoke box cylinder 211 is fixed with the tube plate six 213. The two upper smoke box lifting lugs 214 are respectively fixed on the outer surface of the upper smoke box cylinder 211 and the upper surface of the tube plate six 213 and are symmetrically distributed on both sides.

[0043] Please refer to Figure 8The water inlet / drainage pipe base 281 comprises a water inlet / drainage connector 2811, the upper and lower ends of which are respectively fixed with a docking flange 2812 and a drainage flange 2813, and a water inlet pipe base 2814 is fixed to the water inlet / drainage connector 2811 near the drainage flange 2813, the water inlet pipe base 2814 is in communication with one end of the water supply assembly 6, and the drainage flange 2813 is connected with a drainage valve, and the docking flange 2812 is docked with the side of the lower cylinder 28.

[0044] Please refer to Figure 2 The water supply assembly 6 comprises a water pump 61 arranged in the casing 1, a first water pipe 62 and a second water pipe 63 connected to the water inlet end and the water outlet end of the water pump 61, one end of the first water pipe 62 and the second water pipe 63 away from the water pump 61 is connected with the economizer 3 and the inner container body 2 respectively, and two check valves 64 are arranged on the end of the second water pipe 63 close to the inner container body 2.

[0045] Please refer to Figure 7 The liquid level detection assembly 7 comprises a liquid level gauge cylinder 71, the upper and lower ends of which are respectively fixed with a probe plate 72 and a pipe head 73, two liquid level gauge connectors 74 are fixed to the left side of the liquid level gauge cylinder 71, two liquid level gauge docking pipe bases 75 are fixed to the right side of the liquid level gauge cylinder 71, a liquid level gauge drainage port 76 is fixed to the bottom of the pipe head 73, a water level glass tube 77 is connected between the two liquid level gauge connectors 74, and three-stage probes 78 are arranged on the probe plate 72 and inserted into the liquid level gauge cylinder 71.

[0046] Please refer to Figures 9-10 The economizer 3 comprises an economizer body 31, the upper left side of which is provided with a smoke inlet 32, the lower side of the economizer body 31 is fixed with an inspection port 310, the top of the economizer body 31 is fixed with a chimney pipe 38, finned tubes 39 are arranged in the interior of the economizer body 31, an economizer water tank 33 is fixed to the side of the economizer body 31, an economizer water inlet 34, an economizer water outlet 36, an economizer drainage port 37 and an economizer emptying port 35 are fixed to the economizer water tank 33, and the economizer water outlet 36 is connected with the other end of the water supply assembly 6.

[0047] In summary, the sleeve low-nitrogen gas steam generator of the embodiment can provide heat energy to the inner container body 2 through the low-nitrogen combustion machine 4, and recycle the flue gas generated by the low-nitrogen combustion machine 4 through the economizer 3, so as to accelerate the steam generation efficiency of the steam generator, greatly improve the heat energy utilization rate, reduce the production cost, ensure the heat supply of the steam generator, improve the heat absorption efficiency of the steam generator, reduce the flue gas temperature and reduce the emission of pollutants.

[0048] In the description of the utility model, need understanding is, the orientation word such as " before, after, top, bottom, left, right " " horizontal, vertical, horizontal " and " top, bottom " and so on indicated orientation or positional relationship usually is based on the orientation or positional relationship shown in drawing, just is for the convenience of describing the utility model and simplifying description, under the condition of not making opposite statement, these orientation words do not indicate and suggest the device or element indicated must have a particular orientation or be constructed and operated with a particular orientation, therefore can not be understood as the restriction to the protection scope of the utility model.

[0049] For those skilled in the art, other various corresponding changes and deformations can be made according to the above described technical solutions and concepts, and all these changes and deformations should belong to the protection scope of the utility model claims.

Claims

1. A low-nitrogen gas-steam generator with a casing, characterized in that, The utility model relates to a low-nitrogen combustion boiler, including casing (1) and setting inside the casing (1) inner container body (2), energy saving device (3), low-nitrogen combustion machine (4), inner container support (5), water supply subassembly (6), liquid level detection subassembly (7) and pressure gauge bend (8), the outside of casing (1) is provided with electric control box (101), the effective water volume of inner container body (2) is less than 30L, and the inner container body (2) is parallel with energy saving device (3) and is arranged in casing (1), and the inner container body (2) is arranged at the top of inner container support (5), and the energy saving device (3) is connected with soft water tank, and the low-nitrogen combustion machine (4) is arranged at the bottom of inner container body (2), and the smoke outlet of inner container body (2) is communicated with the smoke inlet of energy saving device (3), and the flue gas produced by low-nitrogen combustion machine (4) enters energy saving device (3) from the smoke outlet and the smoke inlet and heats the soft water in energy saving device (3), and water supply subassembly (6) communicates inner container body (2) and energy saving device (3), and water supply subassembly (6) is used to add the soft water in energy saving device (3) into inner container body (2), and pressure gauge bend (8) is communicated with inner container body (2), and three joints are arranged on pressure gauge bend (8) and correspond to communicate pressure gauge (801), pressure controller (802) and pressure transmitter (803) respectively, and liquid level detection subassembly (7) is communicated with inner container body (2), and steam pipe seat (201) and safety pipe seat (202) are arranged on inner container body (2), and steam valve (203) and safety valve (204) are arranged on steam pipe seat (201) and safety pipe seat (202) respectively.

2. The DNGSG of claim 1, wherein The inner container body (2) includes upper smoke tank (21), upper cylinder (22), tube plate one (23), tube plate two (24), tube plate three (25), tube plate four (26), tube plate five (27) and lower cylinder (28). The lower cylinder (28) inner wall from bottom to top in turn fixed the tube plate one (23), the tube plate two (24) and the tube plate three (25), the smoke outlet is arranged in one side of the lower cylinder (28), the opening position is between the tube plate one (23) and the tube plate two (24), the upper cylinder (22) inner wall lower end fixed the tube plate four (26), the tube plate five (27) is fixed in the end close to the tube plate four (26), the tube plate three (25) and the tube plate four (26) between water pipe (111), fire pipe (112) and finned water pipe (113) are provided, the fire pipe (112) penetrates the water pipe (111) and finned water pipe (113), and the upper and lower ends are fixedly connected with the tube plate five (27) and the tube plate two (24) respectively, the water pipe (111) has 16 branches and is distributed in a circular shape, the outer side of the water pipe (111) is provided with a water pipe sealing plate (114), the water pipe sealing plate (114) is provided with a fire hole pipe (115) outside, the combustion engine pipe cylinder (41) of the low-nitrogen combustion engine (4) is fixed on the lower surface of the tube plate one (23), and penetrates the tube plate one (23), the tube plate two (24) and the tube plate three (25) in turn upwards, the upper smoke cylinder (221) is sleeved in the upper cylinder (22), the upper smoke cylinder (221) penetrates the tube plate four (26) and the tube plate five (27) in turn from bottom to top, the upper smoke box (21) is fixed on the top of the upper cylinder (22), the side of the lower cylinder (28) is provided with a water inlet / drainage pipe seat (281), one end of the water inlet / drainage pipe seat (281) is connected with one end of the water supply assembly (6), the liquid level detection assembly (7) has two upper and lower connecting pipe seats, the lower connecting pipe seat is arranged at the tube plate two (24) and penetrates the lower cylinder (28), the upper connecting pipe seat is arranged at the tube plate three (25) and penetrates the water pipe sealing plate (114), the steam pipe seat (201) and the safety pipe seat (202) are fixed on the tube plate five (27) and penetrate the upper cylinder (22).

3. The DNGSG of claim 2, wherein The upper smoke box (21) includes an upper smoke box cylinder (211), an upper smoke box flange two (212), a tube plate six (213), and two upper smoke box lifting lugs (214), the lower end of the upper smoke box cylinder (211) is fixed with the upper smoke box flange two (212), and the inner wall of the upper end of the upper smoke box cylinder (211) is fixed with the tube plate six (213); the two upper smoke box lifting lugs (214) are respectively fixed on the outer surface of the upper smoke box cylinder (211) and the upper surface of the tube plate six (213), and are symmetrically distributed on both sides.

4. The DNGSG of claim 2, wherein, The water inlet / bleed pipe base (281) comprises a water inlet / bleed connector (2811) having a butt flange (2812) and a bleed flange (2813) fixed at the upper and lower ends respectively, and a water inlet pipe base (2814) fixed near the bleed flange (2813), which is in communication with one end of the water supply assembly (6), and the bleed flange (2813) is connected with a bleed valve, and the butt flange (2812) is butted with the side of the lower cylinder (28).

5. The DNGSG of claim 2, wherein The upper end of the combustion engine pipe cylinder (41) is higher than the pipe plate three (25).

6. The DNGSG of claim 2, wherein The upper end of the upper smoke cylinder (221) is higher than the pipe plate five (27).

7. The DNGSG of claim 2, wherein The finned water pipe (113) is provided with notches.

8. The once-through low-nitrogen gas steam generator according to claim 1, characterized by The water supply assembly (6) comprises a water pump (61) arranged inside the cabinet (1), a first water pipe (62) and a second water pipe (63) connected to the water inlet and outlet ends of the water pump (61), one ends of the first water pipe (62) and the second water pipe (63) away from the water pump (61) are connected with the economizer (3) and the inner container body (2) respectively, and two check valves (64) are arranged at one end of the second water pipe (63) close to the inner container body (2).

9. The once-through low-nitrogen gas steam generator according to claim 1, characterized by The liquid level detection assembly (7) comprises a liquid level gauge cylinder (71) having a probe plate (72) and a pipe head (73) fixed at the upper and lower ends respectively, two liquid level gauge interfaces (74) are fixed at the left side of the liquid level gauge cylinder (71), two liquid level gauge butt pipe bases (75) are fixed at the right side of the liquid level gauge cylinder (71), a liquid level gauge bleed port (76) is fixed at the bottom of the pipe head (73), a water level glass tube (77) is connected between the two liquid level gauge interfaces (74), and three-stage probes (78) are arranged on the probe plate (72) and inserted into the liquid level gauge cylinder (71).

10. The once-through low-nitrogen gas steam generator according to claim 1, characterized by The economizer (3) comprises an economizer body (31), the upper left side of the economizer body (31) is provided with the smoke inlet (32), the lower side of the economizer body (31) is fixed with an inspection port (310), the top of the economizer body (31) is fixed with a chimney pipe (38), the inside of the economizer body (31) is installed with a finned pipe (39), the side of the economizer body (31) is fixed with an economizer water tank (33), the economizer water tank (33) is fixed with an economizer water inlet (34), an economizer water outlet (36), an economizer bleed port (37) and an economizer emptying port (35), and the economizer water outlet (36) is connected with the other end of the water supply assembly (6).

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