Ring pipe type direct-current low-nitrogen gas steam generator

Abstract

The utility model discloses an annular pipe type direct-current low-nitrogen gas steam generator which comprises an outer shell, a burner top seat arranged at the top end of the outer shell, a smoke box arranged at the bottom end of the outer shell, a steam generator smoke outlet arranged in the smoke box, a base arranged at the bottom end of the smoke box, a cooling water jacket arranged in the outer shell, and a hearth water wall annular pipe arranged in the cooling water jacket. A metal fiber combustion head is arranged in the hearth water-cooled wall ring pipe, a heat preservation layer is arranged between the cooling water jacket and the outer shell, a ring pipe assembly is arranged at the bottom end of the hearth water-cooled wall ring pipe, and the bottom end of the ring pipe assembly is connected with the top end of the smoke box through an angle plate. The ring pipe assembly is matched with the hearth water-cooled wall ring pipe and the cooling water jacket, so that feed water of the steam generator is injected from an inlet of the ring pipe assembly at the lower low-temperature section under the action of the water pump, flows upwards to the hearth water-cooled wall ring pipe along the ring pipe assembly under the driving of pressure, and forms countercurrent flow with flue gas; therefore, high heat exchange efficiency is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to a ring-tube type direct-flow low-nitrogen fuel gas steam generator. Background Art

[0002] Steam generator, also called steam heat source machine (commonly known as boiler), is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or steam. The original meaning of pot refers to a water container heated on fire, and furnace refers to a place where fuel is burned. The boiler consists of two parts: pot and furnace.

[0003] Most of the steam generators currently in use are gas-fired, which have the problems of incomplete combustion and uneven heating in their structure. At the same time, the flue gas emission temperature is high and the preheating utilization of the incoming water cannot be achieved, thus reducing the energy efficiency and environmental performance of the steam generator. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provides a ring-tube type direct current low-nitrogen gas steam generator, comprising an outer shell, a burner top seat is arranged at the top of the outer shell, a smoke box is arranged at the bottom of the outer shell, a steam generator smoke outlet is arranged in the smoke box, a base is arranged at the bottom of the smoke box, a cooling water jacket is arranged in the outer shell, a furnace water-cooled wall ring pipe is arranged in the cooling water jacket, a metal fiber burner head is arranged in the furnace water-cooled wall ring pipe, an insulation layer is arranged between the cooling water jacket and the outer shell, a ring pipe assembly is arranged at the bottom of the furnace water-cooled wall ring pipe, the bottom end of the ring pipe assembly is connected to the top of the smoke box through a corner plate, a water jacket water inlet is arranged above the smoke box, the water jacket water inlet is connected to the cooling water jacket input end, a water jacket water outlet is arranged above the water jacket water inlet, the water jacket water outlet is connected to the cooling water jacket output end, an inlet pipe group is arranged at the input end of the ring pipe assembly, a furnace steam outlet is arranged at the top of the furnace water-cooled wall ring pipe, and a condensate discharge port is arranged at the bottom of the steam generator smoke outlet.

[0005] Preferably, a plurality of lifting ears are arranged on the top of the outer shell, the condensate discharge port is arranged on the output end of the condensate drain groove, and the condensate drain groove is arranged on the bottom end of the smoke box.

[0006] Preferably, the annular tube assembly includes a low-temperature section annular tube and a high-temperature section annular tube, the low-temperature section annular tube is arranged below the high-temperature section annular tube, the low-temperature section annular tube is connected to the inlet tube group, and the high-temperature section annular tube is connected to the furnace water-cooled wall annular tube.

[0007] Preferably, the thermal insulation layer is made of aluminum silicate thermal insulation cotton, and the bottom end surface of the inner wall of the smoke box is inclined downward by 1°.

[0008] Preferably, the inlet pipe group includes a mosquito coil water inlet and a main body drain outlet, the mosquito coil water inlet and the main body drain outlet are connected to the ring pipe assembly through a tee pipe, and the mosquito coil water inlet is arranged above the main body drain outlet.

[0009] The beneficial effects of the utility model are as follows: the structure is reasonably designed, and the feed water of the steam generator is injected from the inlet of the lower low-temperature section ring tube assembly by arranging the ring tube assembly in cooperation with the furnace water-cooled wall ring tube and the cooling water jacket, and flows upward along the ring tube assembly to the furnace water-cooled wall ring tube under the driving force of pressure, forming a countercurrent with the flue gas, thereby ensuring a high heat exchange efficiency; the cooling water jacket is tightly attached to the furnace water-cooled wall ring tube, and can absorb the heat transferred from the furnace water-cooled wall ring tube to the outer shell of the steam generator furnace body, thereby reducing the heat dissipation loss of the furnace body and saving insulation materials, and lowering the ambient temperature around the furnace body; the arrangement of the metal fiber burner head enables it to burn fully and heat evenly, thereby improving the energy efficiency and environmental protection performance of the steam generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0011] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0012] Figure 2 It is a main structural schematic diagram of the utility model;

[0013] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0014] In the figure: 1. outer shell; 2. burner top seat; 3. smoke box; 4. steam generator smoke outlet; 5. base; 6. cooling water jacket; 7. insulation layer; 8. furnace water wall annular tube; 9. annular tube assembly; 10. angle plate; 11. water jacket water inlet; 12. water jacket water outlet; 13. mosquito coil water inlet; 14. main body drain outlet; 15. furnace steam outlet; 16. condensate discharge outlet; 17. lifting ear. DETAILED DESCRIPTION

[0015] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, welding, riveting, bonding, etc., or a detachable connection, threaded connection, key connection, pin connection, etc., or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0019] like Figure 1-3 The annular tube type direct current low nitrogen gas steam generator shown in the figure comprises an outer shell 1, a burner top seat 2 is arranged at the top of the outer shell 1, a smoke box 3 is arranged at the bottom of the outer shell 1, a steam generator smoke outlet 4 is arranged in the smoke box 3, a base 5 is arranged at the bottom of the smoke box 3, a cooling water jacket 6 is arranged in the outer shell 1, a furnace water-cooled wall annular tube 8 is arranged in the cooling water jacket 6, a metal fiber burner head is arranged in the furnace water-cooled wall annular tube 8, an insulation layer 7 is arranged between the cooling water jacket 6 and the outer shell 1, and the bottom of the furnace water-cooled wall annular tube 8 is arranged. An annular tube assembly 9 is provided, the bottom end of which is connected to the top of the smoke box 3 through an angle plate 10, a water jacket water inlet 11 is provided above the smoke box 3, the water jacket water inlet 11 is connected to the input end of the cooling water jacket 6, a water jacket water outlet 12 is provided above the water jacket water inlet 11, the water jacket water outlet 12 is connected to the output end of the cooling water jacket 6, an inlet pipe group is provided at the input end of the annular tube assembly 9, a furnace steam outlet 15 is provided at the top end of the furnace water-cooled wall annular tube 8, and a condensate discharge port 16 is provided at the bottom end of the steam generator smoke outlet 4. It should be noted that the metal fiber burner head has excellent air permeability on its surface, uniform pore distribution, flames are formed outside the fiber surface, the flames are short, radially distributed, the temperature field is uniform, the flames are stable, and the safety is good, which meets the use requirements, and the furnace water-cooled wall annular tube 8 is composed of a hollow outer ring of concentric bidirectional spiral annular tubes.

[0020] Specifically, a plurality of lifting ears 17 are arranged at the top of the outer shell 1, and the condensate discharge port 16 is arranged at the output end of the condensate drain groove, and the condensate drain groove is arranged at the bottom of the smoke box 3. It should be noted that since there is still a small amount of salt (dissolved solids) in the feed water, after passing through the heating surface and entering the steam-water separator for separation, it mainly exists in the separated water. This concentrated boiler water is then depressurized by the steam trap, and then continuously discharged from the drain pipe in a very small amount, so that the salt content of the feed water of the steam generator in the water tank will not exceed the standard.

[0021] Specifically, the annular tube assembly 9 includes a low-temperature section annular tube and a high-temperature section annular tube, the low-temperature section annular tube is arranged below the high-temperature section annular tube, the low-temperature section annular tube is connected to the inlet tube group, and the high-temperature section annular tube is connected to the furnace water-cooled wall annular tube 8. It should be noted that the low-temperature section annular tube and the high-temperature section annular tube are both formed by stacking and connecting in series two-way bidirectional symmetrical involute-shaped annular tubes in upper and lower layers.

[0022] Specifically, the insulation layer 7 is made of aluminum silicate insulation cotton, and the bottom end surface of the inner wall of the smoke box 3 is tilted downward by 1°. It should be noted that the setting of the bottom end surface of the inner wall of the smoke box 3 tilting downward by 1° will facilitate the discharge of smoke.

[0023] Specifically, the inlet pipe group includes a mosquito coil water inlet 13 and a body drain port 14, the mosquito coil water inlet 13 and the body drain port 14 are connected to the ring pipe assembly 9 through a tee pipe, and the mosquito coil water inlet 13 is arranged above the body drain port 14. It should be noted that the arrangement of the mosquito coil water inlet 13 will facilitate water supply to the ring pipe assembly 9.

[0024] The working principle of this specific implementation method is as follows: first, water is supplied through the mosquito coil water inlet 13, and then evenly divided into two paths through the tee to enter the low-temperature section ring tube, then enter the high-temperature section ring tube, and finally enter the furnace water-cooled wall ring tube 8. The two ring tubes of the furnace water-cooled wall ring tube 8 are finally gathered into a mother tube and go out from the top outlet. During the process, the water is gradually vaporized by heat to produce a steam-water mixture, which goes out from the furnace steam outlet 15 and enters the unheated steam-water separator for efficient separation. At the same time, the inner cavity formed by the furnace water-cooled wall ring tube 8 is the combustion chamber, and the gas is ignited by high pressure to form a pilot flame. The main fuel natural gas and air are fully premixed before entering the combustion chamber. The premixed gas enters the burner head made of metal fiber fabric. On the one hand, the combustion flame radiates and heats the surrounding furnace water-cooled wall ring tube 8. On the other hand, the high-temperature flue gas generated by the combustion flows downward and is discharged from the steam generator smoke outlet 4 after convective heat exchange through the gap of the ring tube assembly 9. The feed water of the steam generator is injected from the inlet of the lower low-temperature section ring tube under the action of the water pump, and flows upward along the tube to the furnace water-cooled wall ring tube 8 under the drive of pressure, forming a countercurrent with the flue gas, thereby ensuring a higher heat exchange efficiency.

[0025] The present invention is not limited to the above-mentioned specific implementation modes, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A ring-tube type direct current low-nitrogen gas steam generator, comprising an outer shell, a burner top seat is arranged at the top of the outer shell, a smoke box is arranged at the bottom of the outer shell, a steam generator smoke outlet is arranged in the smoke box, a base is arranged at the bottom of the smoke box, a cooling water jacket is arranged in the outer shell, a furnace water-cooled wall ring pipe is arranged in the cooling water jacket, a metal fiber burner head is arranged in the furnace water-cooled wall ring pipe, an insulation layer is arranged between the cooling water jacket and the outer shell, a ring pipe assembly is arranged at the bottom end of the furnace water-cooled wall ring pipe, the bottom end of the ring pipe assembly is connected to the top end of the smoke box through a corner plate, a water jacket water inlet is arranged above the smoke box, the water jacket water inlet is connected to the cooling water jacket input end, a water jacket water outlet is arranged above the water jacket water inlet, the water jacket water outlet is connected to the cooling water jacket output end, an inlet pipe group is arranged at the input end of the ring pipe assembly, a furnace steam outlet is arranged at the top of the furnace water-cooled wall ring pipe, and a condensate discharge port is arranged at the bottom end of the steam generator smoke outlet.

2. The annular tube type direct current low nitrogen gas steam generator according to claim 1, characterized in that: A plurality of lifting ears are arranged on the top of the outer shell, the condensate discharge port is arranged on the output end of the condensate drain groove, and the condensate drain groove is arranged on the bottom end of the smoke box.

3. The annular tube type direct current low nitrogen gas steam generator according to claim 1, characterized in that: The annular tube assembly includes a low-temperature section annular tube and a high-temperature section annular tube. The low-temperature section annular tube is arranged below the high-temperature section annular tube. The low-temperature section annular tube is connected to the inlet tube group, and the high-temperature section annular tube is connected to the furnace water-cooled wall annular tube.

4. The annular tube type direct current low nitrogen gas steam generator according to claim 1, characterized in that: The heat-insulating layer is made of aluminum silicate heat-insulating cotton, and the bottom end surface of the inner wall of the smoke box is inclined downward by 1°.

5. The annular tube type direct current low nitrogen gas steam generator according to claim 1, characterized in that: The inlet pipe group includes a mosquito coil water inlet and a body drain port, the mosquito coil water inlet and the body drain port are connected to the ring pipe assembly through a tee pipe, and the mosquito coil water inlet is arranged above the body drain port.

Images