CN117267706A - Through-flow type low-nitrogen gas boiler system - Google Patents

Through-flow type low-nitrogen gas boiler system Download PDF

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Publication number
CN117267706A
CN117267706A CN202311314870.1A CN202311314870A CN117267706A CN 117267706 A CN117267706 A CN 117267706A CN 202311314870 A CN202311314870 A CN 202311314870A CN 117267706 A CN117267706 A CN 117267706A
Authority
CN
China
Prior art keywords
water tank
heat exchange
nitrogen gas
boiler system
gas boiler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311314870.1A
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Chinese (zh)
Inventor
王树众
赵军
王涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Shenghao Langdao Technology Co ltd
Original Assignee
Shaanxi Shenghao Langdao Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shaanxi Shenghao Langdao Technology Co ltd filed Critical Shaanxi Shenghao Langdao Technology Co ltd
Priority to CN202311314870.1A priority Critical patent/CN117267706A/en
Publication of CN117267706A publication Critical patent/CN117267706A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/36—Water and air preheating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses

Abstract

The invention discloses a through-flow low-nitrogen gas boiler system which comprises a softening water tank, wherein the softening water tank is sequentially connected with an economizer and an external water tank, the outlet of the external water tank is divided into two paths, one path is connected with an upper header through a lower header and a convection heat exchange surface, and the other path returns to the lower header through a water cooling coil pipe arranged on the surface of a burner for cooling the heat exchange surface. The invention has high thermal efficiency, small water volume of equipment and high steam dryness, and realizes the ultralow emission of NOx and no-inspection through-flow.

Description

Through-flow type low-nitrogen gas boiler system
Technical Field
The invention belongs to the technical field of boiler equipment, and particularly relates to a through-flow low-nitrogen gas boiler system.
Background
At present, boiler equipment is accelerating to develop in the direction of low nitrogen, high efficiency and low emission; especially, compared with the traditional steam boiler, the through-flow gas steam boiler has the advantages of higher steam generation speed, smaller water volume, higher safety, no need of periodical annual inspection, wide market favor and wide application in national production and life, such as hotel, food, textile, chemical industry, feed and other industries. However, the through-flow gas steam boiler in the existing market has the defects of large real water volume, large size, high NOx emission, low thermal efficiency and the like.
Disclosure of Invention
The invention aims to solve the technical problems of large water volume, high steam water content and high NOx emission caused by too high combustion temperature of a hearth, and has the advantages of small water volume, capability of effectively improving the heat efficiency of a boiler, reducing the water content of steam, improving the dryness of the steam and reducing the use cost of the steam.
The invention adopts the following technical scheme:
a through-flow low-nitrogen gas boiler system comprises a softened water tank, wherein the softened water tank is connected with an external water tank through an economizer, boiler feed water enters the economizer through the softened water tank for heat exchange, and then is divided into two paths through the external water tank, one path returns to a lower header through a cooling heat exchange surface of a water cooling coil, and the other path is connected with an upper header through the lower header and a convection heat exchange surface.
Specifically, central pipes are uniformly distributed in the lower header, and one end of each central pipe is connected with an outlet of the external water tank.
Further, a plurality of holes are formed around the central tube, and the outer diameter of the central tube is smaller than the inner diameter of the lower header.
Specifically, the external water tank is respectively connected with the lower header and the water-cooling coil pipe through connecting pipelines, and the boiler feed pump and the proportional control valve are arranged on the connecting pipelines.
Specifically, the economizer is in the form of a finned tube.
Specifically, an air preheater is arranged in front of a flue gas pipeline of the economizer.
Specifically, the upper header and the lower header are provided with surface type burners in a penetrating way, and the surface type burners are provided with burner surface metal wires.
Specifically, a folded plate is arranged on the upper header, uneven holes are arranged at two ends of the folded plate, a steam outlet is connected through a pipeline through a gas-liquid separator, and the gas-liquid separator adopts a multi-layer separation device.
Specifically, the inner side of the convection heat exchange surface is provided with a radiation heat exchange surface, the radiation heat exchange surface adopts a nail head pipe form, and the convection heat exchange surface adopts a fin pipe form.
Specifically, a boiler feed pump is arranged on a connecting pipeline at the outlet of the external water tank.
Compared with the prior art, the invention has at least the following beneficial effects:
a through-flow low-nitrogen gas boiler system, wherein an economizer is connected with an external water tank, and an outlet of the external water tank is divided into two paths which are connected with the boiler system. One path is connected with a lower header, and the water supply of the lower header is connected with an upper header after saturated steam is generated by a convection heat exchange surface; the other path is cooled and heat exchanged by a water cooling coil pipe arranged on the surface of the burner and then returned to the lower header. Flame temperature is controlled within a certain range through the water-cooling coil pipe, so that the thermal efficiency of the boiler can be effectively improved, and the emission concentration of NOx can be reduced.
Further, the outlet of the economizer is connected with an external water tank, and the boiler feed pump is arranged on a connecting pipeline of the external water tank and the boiler system, so that the external water tank is positioned outside the pressure-bearing structure, and the water volume of the boiler system is reduced; meanwhile, the coal economizer can realize thermal deoxidization of boiler feed water.
Furthermore, the proportional regulating valve can properly regulate the water quantity entering the cooling heat exchange surface of the water-cooling coil pipe according to the temperature of the hearth, so that the flame temperature is controlled within a certain range, and the emission concentration of NOx is reduced.
Furthermore, the central pipes uniformly distributed in the lower header enter the lower header, so that the water volume of the lower header can be reduced, and the central pipes uniformly discharge water to the lower header.
Further, a gas-liquid separator and a folded plate are arranged in the upper boiler barrel. The gas-liquid separation valve is provided with a plurality of layers of separation devices, and can realize high-efficiency gas-liquid separation. The two sections of the folded plate are provided with uneven small holes, so that the folded plates at the two ends in the saturated steam enter the gas-liquid separator. The dense small holes at the upper part of the folded plate in a large amount of gas flow out, and the water flows out from the sparse small holes at the bottom of the folded plate, so that the fluctuation of the liquid level in the upper header can be prevented.
Furthermore, the economizer adopts a fin tube form, so that the heat exchange coefficient is increased, and the water volume is further reduced.
Furthermore, the convection heat exchange surface adopts a fin tube form, so that the dryness of the steam entering the upper header can be improved.
Furthermore, the air preheater is arranged in front of the flue gas pipeline of the economizer, so that the volume of the air preheater can be effectively reduced by high-temperature flue gas, and the temperature of the flue gas in the economizer can be further reduced, and boiling is avoided.
Furthermore, the radiation heat exchange surface adopts a nail head pipe form, and the heating surface is expanded.
In conclusion, the invention has the advantages of small water volume, high steam dryness and high thermal efficiency, and realizes the ultralow NOx emission through-flow-free detection.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a top view of the present invention;
fig. 2 is a side view of the present invention.
Wherein: 1. a radiant heat exchange surface; 2. convection heat exchange surface; 3. an economizer; 4. an air preheater; 5. an air preheater inlet; 6. an air preheater outlet; 7. a boiler flue gas outlet; 8. an economizer inlet; 9. an economizer outlet; 10. a header is arranged; 11. a lower header; 12. a water-cooled coil inlet; 13. the water-cooling coil pipe cools the heat exchange surface; 14. a burner surface metal mesh wire; 15. a water-cooled coil outlet; 16. cooling the inlet of the underwater header; 17. a surface burner; 18. a hearth flue gas outlet; 19. a flue gas inlet of the economizer; 20. an upper header outlet; 21. a gas-liquid separator; 22. a steam outlet; 23. a boiler feed water pump; 24. a proportional control valve; 25. a folded plate; 26. an external water tank; 27. an economizer outlet; 28. an external water tank outlet; 29. softening the water tank; 30. a central tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1 and 2, the through-flow low-nitrogen gas boiler system of the present invention comprises a softened water tank 29, an economizer 3, an external water tank 26, a lower header 11 and an upper header 10.
The softening water tank 29 is sequentially connected with the coal economizer 3 and the external water tank 26, the outlet of the external water tank is divided into two paths, one path is connected with the lower header 11, and the lower header 11 is connected with the upper header 10 after saturated steam is generated by the convection heat exchange surface 2; the other path returns to the lower header 11 after passing through the water cooling coil pipe cooling heat exchange surface 13; center pipes 30 are uniformly distributed in the lower header 11, and one end of each center pipe 30 is connected with an external water tank outlet 28.
A boiler feed pump 23 is arranged between the external water tank 26 and the boiler system, and a one-way stop valve is arranged at the outlet 28 of the external water tank.
A proportional control valve 24 is arranged on the connecting pipeline between the external water tank 26 and the lower header 11 and the water-cooling coil pipe cooling heat exchange surface 13.
The gas-liquid separator 21 and the folded plate 25 are arranged in the upper drum, and the gas-liquid separator 21 is provided with a plurality of layers of separating devices, so that the gas-liquid can be separated efficiently, and high-quality steam can be obtained.
The two sections of the folded plate 25 are provided with uneven small holes, so that saturated steam enters the gas-liquid separator 21 from the folded plates 25 at the two ends, a large amount of gas flows out from the small holes densely arranged at the upper parts of the folded plates 25, and water flows out from the small holes sparsely arranged at the bottoms of the folded plates 25, so that the fluctuation of the liquid level in the upper header 10 can be prevented.
After passing through the economizer 3 and the external water tank 26, boiler feed water enters the boiler system in two ways. One path enters the water-cooling coil, exchanges heat in the cooling heat exchange surface 13 of the water-cooling coil, and then enters the lower header 11. The other path enters the lower header 11 through central pipes uniformly distributed in the lower header 11, and after heat exchange is carried out on the convection heat exchange surface 2 between the lower header 11 and the upper header 10, steam is generated and enters the upper header 10, and then steam-water separation is carried out on the steam generated by the upper header 10 to be supplied to users.
A plurality of small holes are formed around the center tube 30 of the lower header 11, and the outer diameter of the center tube 30 is smaller than the inner diameter of the lower header 11.
The economizer 3 adopts a fin tube form, increases the heat exchange coefficient, and then reduces the water volume.
The air preheater 4 is arranged in front of the flue gas pipeline of the economizer 3, so that the volume of the air preheater 4 can be effectively reduced by high-temperature flue gas, and the temperature of the flue gas in the economizer 3 can be further reduced, and boiling is avoided.
The external water tank 26 is arranged behind the economizer 3, so that the water volume of the boiler system is effectively reduced, and the thermal deoxygenation of the boiler feed water is realized through the economizer 3.
After the boiler feed water pump 23 is arranged on the external water tank 26, the water volume of the inspection-free boiler is effectively reduced.
The radiation heat exchange surface 1 adopts a nail head pipe and the like to expand the heat exchange surface, thereby improving the radiation heat exchange intensity.
The convection heat exchange surface 2 adopts a fin tube form, so that the dryness of steam entering the upper header is improved.
The water quantity entering the water cooling coil pipe cooling heat exchange surface 13 is properly regulated according to the temperature of the hearth through the proportional regulating valve 24, so that the flame temperature is in a certain range, and the emission concentration of NOx is reduced.
The invention relates to a through-flow low-nitrogen gas boiler system, which comprises the following working processes:
the water supply is treated by the water softening device and then sequentially enters the economizer 3 and the external water tank, and enters the boiler system through the boiler water supply pump; two paths of water at the outlet of the external water tank enter a water-cooling coil, one path of water enters a lower header 11 after heat exchange with a metal mesh 14 on the surface of the burner in a cooling heat exchange surface 13 of the water-cooling coil. The other path enters the lower header 11 through central pipes uniformly distributed in the lower header 11, and after heat exchange is carried out on the convection heat exchange surface 2 between the lower header 11 and the upper header 10, steam is generated and enters the upper header 10, and then steam-water separation is carried out on the steam generated by the upper header 10 to be supplied to users.
The temperature of the regulating valve of the water-cooling coil pipe cooling heat exchange surface 13 is regulated according to the temperature of the hearth, so that the flame temperature is stabilized within a set range, and the emission concentration of NOx is reduced.
In summary, the invention is a through-flow low-nitrogen gas boiler system. In the invention, boiler feed water enters the lower header through the central pipe, and the water is uniformly distributed, so that the safe operation of the boiler is ensured. In addition, the system cools the inside of the burner through the circulating water of the lower header, controls the flame temperature and reduces the emission concentration of NOx. The convection heating surface and the economizer adopt a fin tube form, so that the heat exchange efficiency is improved, and the water volume and the steam humidity are reduced. The boiler feed water pump is arranged outside the economizer, so that the water volume is further reduced, and the system structure is simplified. Therefore, the invention provides a more efficient, energy-saving, environment-friendly and safe inspection-free boiler system.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (10)

1. The through-flow low-nitrogen gas boiler system is characterized by comprising a softening water tank (29), wherein the softening water tank (29) is connected with an external water tank (26) through an economizer (3), boiler feed water enters the economizer (3) through the softening water tank (29) for heat exchange, and then is divided into two paths through the external water tank (26), one path returns to a lower header (11) through a water-cooling coil pipe cooling heat exchange surface (13), and the other path is connected with an upper header (10) through the lower header (11) and a convection heat exchange surface (2).
2. The through-flow low-nitrogen gas boiler system according to claim 1, wherein central pipes (30) are uniformly distributed in the lower header (11), and one end of the central pipe (30) is connected with an outlet of the external water tank (26).
3. The through-flow low-nitrogen gas boiler system according to claim 2, wherein a plurality of holes are formed around the center pipe (30), and an outer diameter of the center pipe (30) is smaller than an inner diameter of the lower header (11).
4. The through-flow low-nitrogen gas boiler system according to claim 1, wherein the external water tank (26) is connected with the lower header (11) and the water-cooling coil (13) through connecting pipelines respectively, and the boiler feed water pump (23) and the proportional control valve (24) are arranged on the connecting pipelines.
5. The through-flow low-nitrogen gas boiler system according to claim 1, wherein the economizer (3) takes the form of a finned tube.
6. The through-flow low-nitrogen gas boiler system according to claim 1, characterized in that an air preheater (4) is arranged in front of the flue gas duct of the economizer (3).
7. The through-flow low-nitrogen gas boiler system according to claim 1, wherein the upper header (10) and the lower header (11) are provided with surface burners (17) in a penetrating manner, and the surface burners (17) are provided with burner surface metal wires (14).
8. The through-flow low-nitrogen gas boiler system according to claim 1, wherein a folded plate (25) is arranged on the upper header (10), uneven holes are arranged at two ends of the folded plate (25), a steam outlet (22) is connected through a pipeline via a gas-liquid separator (21), and the gas-liquid separator (21) adopts a multi-layer separation device.
9. The through-flow low-nitrogen gas boiler system according to claim 1, wherein the radiation heat exchange surface (1) is arranged on the inner side of the convection heat exchange surface (2), the radiation heat exchange surface (1) is in the form of a nail head tube, and the convection heat exchange surface (2) is in the form of a fin tube.
10. The through-flow low-nitrogen gas boiler system according to claim 1, wherein a boiler feed pump (23) is arranged on a connecting pipe at the outlet of the external water tank (26).
CN202311314870.1A 2023-10-11 2023-10-11 Through-flow type low-nitrogen gas boiler system Pending CN117267706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311314870.1A CN117267706A (en) 2023-10-11 2023-10-11 Through-flow type low-nitrogen gas boiler system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311314870.1A CN117267706A (en) 2023-10-11 2023-10-11 Through-flow type low-nitrogen gas boiler system

Publications (1)

Publication Number Publication Date
CN117267706A true CN117267706A (en) 2023-12-22

Family

ID=89200723

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311314870.1A Pending CN117267706A (en) 2023-10-11 2023-10-11 Through-flow type low-nitrogen gas boiler system

Country Status (1)

Country Link
CN (1) CN117267706A (en)

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