Cross-flow type steam generator

Abstract

The utility model discloses a cross-flow type steam generator which comprises a shell, an electric box, a low-nitrogen burner, a condenser, a supply pump and a furnace body, the electric box, the low-nitrogen burner, the condenser, the supply pump and the furnace body are all arranged in the shell and connected with the shell, the condenser is respectively connected with the supply pump and the furnace body, the low-nitrogen burner is connected with the furnace body, and the low-nitrogen burner is connected with the furnace body. A burner pipe is arranged on the low-nitrogen burner, the lower end of the burner pipe is fixedly connected with the low-nitrogen burner, the burner pipe is connected with the furnace body, a plurality of heat conduction pipes and a water vapor separation plate are arranged in the furnace body, the heat conduction pipes are evenly distributed in the furnace body and fixedly connected with the lower end face in the furnace body, and a boiling stopping plate is arranged on the upper end face of each heat conduction pipe. The boiling stopping plate is fixedly connected with the upper end face of the heat conduction pipe, the number of the water-vapor separation plates is two, one water-vapor separation plate is perpendicular to the other water-vapor separation plate, and the two water-vapor separation plates are connected. The utility model has the beneficial effects that the heat exchange area is larger, the water volume is smaller, the steam yield is higher, and the steam dryness is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to the related technical field of steam generator, and especially is a kind of conventional flow type steam generator. BACKGROUND

[0002] The principle of gas steam generator: gas combustion produces heat energy, heats the water in boiler, makes it become steam, the heat released by steam is absorbed again, and high-temperature high-pressure steam is produced by continuous circulation heating. The main components of gas steam generator include boiler body, boiler control system, inlet and outlet pipeline etc. Steam has great effect, is widely used in industry and life in various places, full premixing low-nitrogen condensing steam generator not only saves manpower, but also improves the efficiency of industrial production. With the aggravation of environmental pollution and the implementation of policy, ordinary gas, coal as fuel brings too much pollution, is gradually abandoned by various industries. The heat efficiency of tubular boiler is higher, the sealing condition is good because the fuel used is natural gas or liquefied gas, so that the whole flue gas passage is concentrated in the inside of boiler body, so that the sealing performance and safety performance are better, in addition to the problem of environmental protection, the heat exchange area of existing tubular boiler gas steam generator is not enough, water volume is too large, steam production is not enough, and steam dryness is not enough. CONTENT OF UTILITY MODEL

[0003] The utility model discloses in order to overcome the insufficient of the heat exchange area not enough, water volume too large, steam production not enough, steam dryness not enough in the prior art, provide a conventional flow type steam generator, the heat exchange area is larger, water volume is smaller, steam production is more, and steam dryness is higher.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The utility model provides a kind of induced draft steam generator, including shell, electric box, low-nitrogen combustion engine, condenser, make-up pump and furnace body, the electric box, low-nitrogen combustion engine, condenser, make-up pump and furnace body are placed in shell and are connected with shell, the electric box is connected with low-nitrogen combustion engine, condenser, make-up pump and furnace body respectively, the condenser is connected with make-up pump and furnace body respectively, the low-nitrogen combustion engine is placed below furnace body and is connected with furnace body, combustion engine pipe is equipped on the low-nitrogen combustion engine, the lower end of combustion engine pipe is fixedly connected with low-nitrogen combustion engine, the upper end of combustion engine pipe is placed in furnace body after passing through the lower end surface of furnace body, combustion engine pipe is connected with the lower end surface of furnace body, heat pipe and water vapor separation plate are equipped in furnace body, the heat pipe is several and is evenly distributed in furnace body with combustion engine pipe as center, the lower end of heat pipe is fixedly connected with the lower end surface in furnace body, the upper end surface of heat pipe is equipped with boiling stop plate, the lower end surface of boiling stop plate is fixedly connected with the upper end surface of heat pipe, the water vapor separation plate has two, one of water vapor separation plate is annular and perpendicular to heat plate upper end surface, the lower end surface of water vapor separation plate perpendicular to heat pipe is connected with the upper end surface of heat pipe, boiling stop plate is placed in water vapor separation plate, the shape of one water vapor separation plate is annular and perpendicular to the upper end surface of another water vapor separation plate, two water vapor separation plates are connected.

[0006] When installing, first make-up pump's water pipe is connected with water pipe after passing through shell, then low-nitrogen combustion engine is connected with natural gas, and electric box is powered on;When using, make-up pump transmits water to condenser, and then to furnace body, and furnace body is the main part of steam generation, mainly composed of heat pipe, water vapor separation plate, boiling stop plate, combustion engine pipe etc.When low-nitrogen combustion engine releases heat energy through combustion engine pipe and heats furnace water in heat pipe, water forms steam under high temperature and high pressure, steam becomes drier after filtering by two water vapor separation plates and boiling stop plate, steam is sent to external equipment or system to provide required heat or power, and part of steam enters condenser to be liquefied, and liquefied water can enter furnace body again to be liquefied again, so as to be reused, and the practical efficiency of steam heat is higher, and the heat exchange area is greatly increased by several heat pipes, so that water volume can be smaller, and condenser can produce more steam under the same water volume, to achieve the purpose of larger heat exchange area, smaller water volume, more steam production and higher steam dryness.

[0007] As preferred, the supply pump is provided with an inlet pipe and a communication pipe, one end of the inlet pipe is communicated with the supply pump, the other end of the inlet pipe is arranged outside the shell after penetrating the shell, one end of the communication pipe is communicated with the supply pump, the other end of the communication pipe is communicated with the condenser, the condenser is provided with an overflow pipe and a smoke exhaust pipe, one end of the overflow pipe is communicated with the condenser, the other end of the overflow pipe is arranged outside the shell after penetrating the shell, one end of the smoke exhaust pipe is communicated with the condenser, the other end of the smoke exhaust pipe is arranged outside the shell after penetrating the shell. The overflow pipe facilitates the discharge of excess water in the furnace body, preventing excessive water from causing backflow.

[0008] As preferred, the condenser is provided with finned tubes, the finned tubes are arranged on the front and rear end faces of the condenser, the finned tubes are in U shape, the two ends of the U-shaped finned tubes are arranged in the condenser after penetrating the outer side of the condenser, and one end of the U-shaped finned tube is connected with one end of the adjacent finned tube on the other face of the condenser. The finned tube is in U shape, has larger contact area, and can improve the heat transfer efficiency.

[0009] As preferred, the shell is provided with a furnace body frame, the lower end face of the furnace body frame is fixedly connected with the inner bottom face of the shell, the furnace body is arranged on the upper end face of the furnace body frame and is fixedly connected with the upper end face of the furnace body frame, the low-nitrogen combustion machine is arranged below the furnace body frame, the condenser is provided with a steam passage pipe, and the condenser is communicated with the furnace body through the steam passage pipe. The furnace body frame facilitates the arrangement of the furnace body and the low-nitrogen combustion machine, and makes the furnace body more stable.

[0010] As preferred, the low-nitrogen combustion machine is provided with a gas pipe, one end of the gas pipe is communicated with the low-nitrogen combustion machine, the other end of the gas pipe is arranged outside the shell after penetrating the shell, the furnace body is provided with a blowdown pipe, one end of the blowdown pipe is communicated with the furnace body, and the other end of the blowdown pipe is arranged outside the shell after penetrating the shell. The blowdown pipe facilitates the discharge of some impurities after combustion, makes the fuel and air fully mixed, reduces harmful substances generated in the combustion process, makes the flue gas emission cleaner, and causes less environmental pollution.

[0011] As preferred, the furnace body is provided with a safety valve and a full premix water level frame pipe, one end of the safety valve is fixedly connected with the furnace body, the other end of the safety valve is arranged outside the shell after penetrating the shell, one end of the full premix water level frame pipe is connected with the safety valve, and the other end of the full premix water level frame pipe is communicated with the blowdown pipe. The safety valve and the full premix water level frame pipe are both for safety consideration.

[0012] As preferred, the furnace body is provided with a steam outlet valve, one end of the steam outlet valve is fixedly connected with the furnace body, and the other end of the steam outlet valve is arranged outside the shell after penetrating the shell. The steam outlet valve facilitates steam discharge and can control the steam discharge amount.

[0013] As preferred, the shell is provided with a filter, the filter is fixedly connected with the shell, and the filter is located corresponding to the low-nitrogen combustion machine. The filter reduces impurities in the air from entering the shell, reduces the influence of dust on the machine, increases the service life of the machine, and also enhances safety.

[0014] As preferred, the combustion machine pipe is provided with a generating block, the generating block is a plurality of and uniformly distributed on the outer side of the combustion machine pipe, and the generating block is fixedly connected with the outer side of the combustion machine pipe. The generating block can increase the heating surface area of the combustion machine pipe, heat faster, and have higher thermal energy efficiency.

[0015] As preferred, the shell is provided with an operation screen, a power display lamp, a switch and an alarm lamp, the operation screen, the power display lamp, the switch and the alarm lamp are fixedly connected with the outer side of the shell, and the operation screen, the power display lamp, the switch and the alarm lamp are respectively connected with the electric box, the supply pump, the condenser and the low-nitrogen combustion machine. The operation screen, the power display lamp, the switch and the alarm lamp are convenient for controlling the machine, and safety prompt can be timely, reducing the influence of emergencies.

[0016] The heat exchange area is larger, the water volume is smaller, the steam production is more, and the steam dryness is higher. The overflow pipe can conveniently discharge excess water in the furnace body, prevent too much water from causing backflow, the finned pipe is in a U shape, has a larger contact area, and can make the transmission of thermal energy more efficient, the furnace body frame can conveniently arrange the furnace body and the low-nitrogen combustion machine, and the furnace body is placed more stably, the blowdown pipe can conveniently discharge some impurities after combustion, fully mixes fuel and air, reduces harmful substances generated in the combustion process, discharges flue gas more cleanly, and causes less environmental pollution, the safety valve and the full-premix water level frame pipe are for safety consideration, the steam outlet valve can conveniently discharge steam and control steam discharge, the filter reduces impurities in the air from entering the shell, reduces the influence of dust on the machine, increases the service life of the machine, and also enhances safety, the generating block can increase the heating surface area of the combustion machine pipe, heat faster, and have higher thermal energy efficiency, and the operation screen, the power display lamp, the switch and the alarm lamp are convenient for controlling the machine, safety prompt can be timely, and the influence of emergencies is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the utility model;

[0018] Figure 2 is a structural schematic view of the inside of the shell of the utility model;

[0019] Figure 3 is Figure 2 a front view of

[0020] Figure 4 is Figure 3 a sectional view of A-A of

[0021] Figure 5 is Figure 4 an enlarged view of detail B;

[0022] Figure 6 is Figure 4 an enlarged view of detail C.

[0023] In the figure: 1. shell, 2. electric box, 3. low-nitrogen combustion machine, 4. condenser, 5. make-up pump, 6. furnace body, 7. combustion machine pipe, 8. heat-conducting pipe, 9. water-vapor separation plate, 10. boiling-stop plate, 11. water inlet pipe, 12. connecting pipe, 13. overflow pipe, 14. flue pipe, 15. finned pipe, 16. furnace body support, 17. steam passage pipe, 18. blowdown pipe, 19. safety valve, 20. full-premix water level support pipe, 21. steam outlet valve, 22. filter, 23. generating block, 24. operation screen, 25. power supply display lamp, 26. switch, 27. alarm lamp, 28. gas pipe. DETAILED DESCRIPTION

[0024] The utility model will be further described in connection with the drawings and specific embodiments.

[0025] As Figures 1 to 5 shown, a kind of flow type steam generator, it includes shell 1, electric box 2, low-nitrogen combustion machine 3, condenser 4, make-up pump 5 and furnace body 6, electric box 2, low-nitrogen combustion machine 3, condenser 4, make-up pump 5 and furnace body 6 are placed in shell 1 and are connected with shell 1, electric box 2 is connected with low-nitrogen combustion machine 3, condenser 4, make-up pump 5 and furnace body 6 respectively, condenser 4 is connected with make-up pump 5 and furnace body 6 respectively, low-nitrogen combustion machine 3 is placed below furnace body 6 and is connected with furnace body 6, low-nitrogen combustion machine 3 is equipped with combustion machine pipe 7, the lower end of combustion machine pipe 7 is fixedly connected with low-nitrogen combustion machine 3, the upper end of combustion machine pipe 7 is placed in furnace body 6 after passing through the lower end surface of furnace body 6, and combustion machine pipe 7 is connected with the lower end surface of furnace body 6, heat-conducting pipe 8 and water-vapor separation plate 9 are equipped in furnace body 6, heat-conducting pipe 8 has several and is evenly distributed in furnace body 6 with combustion machine pipe 7 as center, the lower end of heat-conducting pipe 8 is fixedly connected with the lower end surface in furnace body 6, boiling-stop plate 10 is equipped on the upper end surface of heat-conducting pipe 8, and the lower end surface of boiling-stop plate 10 is fixedly connected with the upper end surface of heat-conducting pipe 8, water-vapor separation plate 9 has two, one water-vapor separation plate 9 is annular and perpendicular to the upper end surface of heat-conducting plate, and the lower end surface of water-vapor separation plate 9 perpendicular to heat-conducting pipe 8 is connected with the upper end surface of heat-conducting pipe 8, boiling-stop plate 10 is placed in water-vapor separation plate 9, one water-vapor separation plate 9 is annular and perpendicular to the upper end surface of another water-vapor separation plate 9, and the two water-vapor separation plates 9 are connected.

[0026] As Figures 2 to 4As shown in the drawings, the supply pump 5 is provided with an inlet pipe 11 and a communication pipe 12. One end of the inlet pipe 11 is communicated with the supply pump 5, and the other end of the inlet pipe 11 is arranged outside the shell 1 after penetrating through the shell 1. One end of the communication pipe 12 is communicated with the supply pump 5, and the other end of the communication pipe 12 is communicated with the condenser 4. The condenser 4 is provided with an overflow pipe 13 and a smoke exhaust pipe 14. One end of the overflow pipe 13 is communicated with the condenser 4, and the other end of the overflow pipe 13 is arranged outside the shell 1 after penetrating through the shell 1. One end of the smoke exhaust pipe 14 is communicated with the condenser 4, and the other end of the smoke exhaust pipe 14 is arranged outside the shell 1 after penetrating through the shell 1.

[0027] As shown in the drawings, Figure 1 and Figure 2 the condenser 4 is provided with finned tubes 15. The finned tubes 15 are arranged on the front and rear end faces of the condenser 4 respectively. The finned tubes 15 are in U-shaped. The two ends of the U-shaped finned tubes 15 are arranged in the condenser 4 after penetrating through the outer side face of the condenser 4. One end of the U-shaped finned tube 15 is connected with one end of the adjacent finned tube 15 on the other face of the condenser 4.

[0028] As shown in the drawings, Figures 2 to 4 the shell 1 is provided with a furnace body support 16. The lower end face of the furnace body support 16 is fixedly connected with the inner bottom face of the shell 1. The furnace body 6 is arranged on the upper end face of the furnace body support 16 and is fixedly connected with the upper end face of the furnace body support 16. The low-nitrogen combustion machine 3 is arranged below the furnace body support 16. The condenser 4 is provided with a steam passage pipe 17. The condenser 4 is communicated with the furnace body 6 through the steam passage pipe 17.

[0029] As shown in the drawings, Figure 2 and Figure 3 the low-nitrogen combustion machine 3 is provided with a gas pipe 28. One end of the gas pipe 28 is communicated with the low-nitrogen combustion machine 3, and the other end of the gas pipe 28 is arranged outside the shell 1 after penetrating through the shell 1. The furnace body 6 is provided with a blowdown pipe 18. One end of the blowdown pipe 18 is communicated with the furnace body 6, and the other end of the blowdown pipe 18 is arranged outside the shell 1 after penetrating through the shell 1.

[0030] As shown in the drawings, Figures 1 to 4 the furnace body 6 is provided with a safety valve 19 and a full premix water level support pipe 20. One end of the safety valve 19 is fixedly connected with the furnace body 6, and the other end of the safety valve 19 is arranged outside the shell 1 after penetrating through the shell 1. One end of the full premix water level support pipe 20 is connected with the safety valve 19, and the other end of the full premix water level support pipe 20 is communicated with the blowdown pipe 18.

[0031] As shown in the drawings, Figures 1 to 4 the furnace body 6 is provided with a steam outlet valve 21. One end of the steam outlet valve 21 is fixedly connected with the furnace body 6, and the other end of the steam outlet valve 21 is arranged outside the shell 1 after penetrating through the shell 1.

[0032] As shown in the drawings, Figure 1As shown in the figure, the filter 22 is arranged on the shell 1, and the filter 22 is fixedly connected with the shell 1, and the position of the filter 22 corresponds to the position of the low-nitrogen combustion machine 3.

[0033] As shown in the figure, the combustion machine pipe 7 is provided with the generating block 23, and the generating block 23 is uniformly distributed on the outer side of the combustion machine pipe 7, and the generating block 23 is fixedly connected with the outer side of the combustion machine pipe 7. Figure 4 Figure 6 As shown in the figure, the combustion machine pipe 7 is provided with the generating block 23, and the generating block 23 is uniformly distributed on the outer side of the combustion machine pipe 7, and the generating block 23 is fixedly connected with the outer side of the combustion machine pipe 7.

[0034] As shown in the figure, the combustion machine pipe 7 is provided with the generating block 23, and the generating block 23 is uniformly distributed on the outer side of the combustion machine pipe 7, and the generating block 23 is fixedly connected with the outer side of the combustion machine pipe 7. Figure 1 As shown in the figure, the operation screen 24, the power display lamp 25, the switch 26 and the alarm lamp 27 are arranged on the shell 1, and the operation screen 24, the power display lamp 25, the switch 26 and the alarm lamp 27 are fixedly connected with the outer side of the shell 1, and the operation screen 24, the power display lamp 25, the switch 26 and the alarm lamp 27 are respectively connected with the electric box 2, the supply pump 5, the condenser 4 and the low-nitrogen combustion machine 3.

[0035] ​When installing, first put the water inlet pipe 11 of the supply pump 5 through the shell 1 and connect it with the water pipe, then connect the low-nitrogen combustion engine 3 with the natural gas pipe 28, connect the electric box 2 with the power, put the overflow pipe 13 and the sewage pipe 18 through the shell 1 and outside the shell 1, install the exhaust hood higher than the outlet of the exhaust pipe 14 by 300MM, such as the boat-shaped hood used in hotel kitchen, no need to install the exhaust fan, the water tower requires the bottom to be higher than the top of the supply pump 5 by 500MM, which is beneficial to the water pressure, the furnace body 6 is placed on the furnace body frame 16, which is convenient for installing the low-nitrogen combustion engine 3 below and can save space; when using, first turn on the switch 26, then operate on the operation screen 24, the supply pump 5 transmits water to the condenser 4 through the communication pipe 12, then to the furnace body 6 through the steam pipe 17, the furnace body 6 is the main part of steam generation, mainly composed of heat conducting pipe 8, water vapor separation plate 9, boiling stop plate 10, combustion engine pipe 7, etc. When the low-nitrogen combustion engine 3 releases heat energy through the combustion engine pipe 7 to heat the water in the heat conducting pipe 8, the water forms steam under high temperature and pressure, the steam becomes drier after three layers of water vapor separation of the two water vapor separation plates 9 and the boiling stop plate 10, the steam is sent to external equipment or system through the steam valve 21 to provide the required heat or power, part of the steam enters the condenser 4 to be liquefied through the finned tube 15, the liquefied water can enter the furnace body 6 again to be liquefied again, so as to be reused, the practical efficiency of the steam heat is higher, plus several heat conducting pipes 8, which greatly increases the heat exchange area and also reduces the water volume, the generating block 23 on the combustion engine pipe 7 increases the heating area, the steam is also generated faster, the condenser 4 can generate more steam under the same water volume, the filter 22 on the shell 1 can reduce the entry of dust and reduce the influence of dust on the machine to prolong the service life of the machine, the display of the alarm lamp 27 can make the fault be repaired in time to reduce the harm, the safety valve 19 and the full premix water level frame pipe 20 on the furnace body 6 can make the furnace body 6 have certain self-regulating ability when generating steam to reduce safety problems, which achieves the purpose of larger heat exchange area, smaller water volume, more steam production and higher steam dryness.

Claims

1. A once-through steam generator characterized by, The utility model provides a low nitrogen combustion boiler, including shell (1), electric box (2), low nitrogen combustion machine (3), condenser (4), make -up pump (5) and furnace body (6), electric box (2), low nitrogen combustion machine (3), condenser (4), make -up pump (5) and furnace body (6) are all placed in shell (1) and are connected with shell (1), electric box (2) is connected with low nitrogen combustion machine (3), condenser (4), make -up pump (5) and furnace body (6) respectively, condenser (4) is connected with make -up pump (5) and furnace body (6) respectively, low nitrogen combustion machine (3) is placed in the below of furnace body (6) and is connected with furnace body (6), be equipped with combustion machine pipe (7) on low nitrogen combustion machine (3), the lower end of combustion machine pipe (7) is fixedly connected with low nitrogen combustion machine (3), the upper end of combustion machine pipe (7) is placed in furnace body (6) after passing through the lower end surface of furnace body (6), and combustion machine pipe (7) is connected with the lower end surface of furnace body (6), be equipped with heat pipe (8) and water vapor separation board (9) in furnace body (6), heat pipe (8) has several and is evenly distributed in furnace body (6) with combustion machine pipe (7) as center, the lower end of heat pipe (8) is fixedly connected with the lower end surface in furnace body (6), the upper end surface of heat pipe (8) is equipped with boiling stop board (10), the lower end surface of boiling stop board (10) is fixedly connected with the upper end surface of heat pipe (8), water vapor separation board (9) has two, wherein one water vapor separation board (9) is annular and is perpendicular to heat pipe (8) on the upper end surface, and the lower end surface of water vapor separation board (9) is connected with the upper end surface of heat pipe (8), boiling stop board (10) is placed in water vapor separation board (9), and one water vapor separation board (9) is annular and is perpendicular to the upper end surface of another water vapor separation board (9), and two water vapor separation boards (9) are connected.

2. A once-through steam generator according to claim 1, characterized in that Make -up pump (5) is equipped with inlet pipe (11) and communication pipe (12) on it, one end of inlet pipe (11) is communicated with make -up pump (5), the other end of inlet pipe (11) is placed outside shell (1) after passing through shell (1), one end of communication pipe (12) is communicated with make -up pump (5), the other end of communication pipe (12) is communicated with condenser (4), overflow pipe (13) and smoke pipe (14) are equipped on condenser (4), one end of overflow pipe (13) is communicated with condenser (4), the other end of overflow pipe (13) is placed outside shell (1) after passing through shell (1), one end of smoke pipe (14) is communicated with condenser (4), the other end of smoke pipe (14) is placed outside shell (1) after passing through shell (1).

3. A once-through steam generator according to claim 2, characterized in that Condenser (4) is equipped with finned tube (15), finned tube (15) has several and is placed on the front and rear end surfaces of condenser (4) respectively, the shape of finned tube (15) is U type, and the two ends of the U type of finned tube (15) are placed in condenser (4) after passing through the outer side of condenser (4), and one end of the U type of finned tube (15) is connected with the other end of the adjacent finned tube (15) of the other side of condenser (4).

4. A once-through steam generator according to claim 1, wherein The shell (1) is internally provided with a furnace body frame (16), the lower end surface of the furnace body frame (16) is fixedly connected with the inner bottom surface of the shell (1), the furnace body (6) is placed on the upper end surface of the furnace body frame (16) and is fixedly connected with the upper end surface of the furnace body frame (16), the low-nitrogen combustion machine (3) is placed below the furnace body frame (16), the condenser (4) is provided with a steam pipe (17), and the condenser (4) is communicated with the furnace body (6) through the steam pipe (17).

5. A once-through steam generator according to claim 4, characterized in that The low-nitrogen combustion machine (3) is provided with a gas pipe (28), one end of the gas pipe (28) is communicated with the low-nitrogen combustion machine (3), the other end of the gas pipe (28) is placed outside the shell (1) after penetrating through the shell (1), the furnace body (6) is provided with a blowdown pipe (18), one end of the blowdown pipe (18) is communicated with the furnace body (6), and the other end of the blowdown pipe (18) is placed outside the shell (1) after penetrating through the shell (1).

6. A once-through steam generator according to claim 5, characterized in that The furnace body (6) is provided with a safety valve (19) and a full premix water level frame pipe (20), one end of the safety valve (19) is fixedly connected with the furnace body (6), the other end of the safety valve (19) is placed outside the shell (1) after penetrating through the shell (1), one end of the full premix water level frame pipe (20) is connected with the safety valve (19), and the other end of the full premix water level frame pipe (20) is communicated with the blowdown pipe (18).

7. A once-through steam generator according to claim 6, characterized in that The furnace body (6) is provided with a steam outlet valve (21), one end of the steam outlet valve (21) is fixedly connected with the furnace body (6), and the other end of the steam outlet valve (21) is placed outside the shell (1) after penetrating through the shell (1).

8. A once-through steam generator according to claim 5, wherein The shell (1) is provided with a filter (22), the filter (22) is fixedly connected with the shell (1), and the position of the filter (22) corresponds to the position of the low-nitrogen combustion machine (3).

9. A once-through steam generator according to claim 1, wherein The combustion machine pipe (7) is provided with a generating block (23), the generating block (23) is uniformly distributed on the outer side surface of the combustion machine pipe (7), and the generating block (23) is fixedly connected with the outer side surface of the combustion machine pipe (7).

10. A once-through steam generator according to claim 1, characterized in that The shell (1) is provided with an operation screen (24), a power display lamp (25), a switch (26) and an alarm lamp (27), the operation screen (24), the power display lamp (25), the switch (26) and the alarm lamp (27) are fixedly connected with the outer side surface of the shell (1), and the operation screen (24), the power display lamp (25), the switch (26) and the alarm lamp (27) are respectively connected with the electric box (2), the supply pump (5), the condenser (4) and the low-nitrogen combustion machine (3).

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