Low-nitrogen combustion gas-steam boiler

Abstract

The utility model relates to the technical field of boilers, in particular to a low-nitrogen combustion gas-steam boiler which comprises a boiler body, an upper boiler body is mounted at the top of the boiler body, a lower boiler body is mounted at the bottom of the boiler body, the upper boiler body comprises an upper barrel, an upper seal head is mounted at the top of the upper barrel, an upper tube plate is mounted at the bottom of the upper barrel, and the lower boiler body comprises a lower barrel. A lower end socket is installed at the bottom of the lower cylinder body, a lower tube plate is installed at the top of the lower end socket, a hearth is arranged in the middle of the furnace body, a first water-cooled wall tube, a second water-cooled wall tube and a third water-cooled wall tube are sequentially arranged in the hearth, and the upper cylinder body and the lower cylinder body are communicated through the first water-cooled wall tube, the second water-cooled wall tube and the third water-cooled wall tube. According to the low-nitrogen combustion gas-steam boiler, through the first water cooling wall tube, the second water cooling wall tube and the third water cooling wall tube which are reasonably arranged, the flame temperature and the flue gas emission temperature are effectively reduced, generation of thermal nitrogen oxide is restrained, nitrogen oxide emission is lower than the environmental protection standard, and the newest environmental protection requirement is met.

Description

TECHNICAL FIELD

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

[0002] In recent years, with the continuous promotion of urbanization and industrialization, the per capita energy consumption of residents is increasing, while the carrying capacity of the environment is weakening. At the same time, the public's demand for ecological construction is also increasing. In order to adapt to this situation, natural gas, as a relatively efficient and clean fuel energy, plays a crucial role in the process of energy structure transformation.

[0003] As a form of surface burner, the planar burner has many advantages. It only needs to use one side of the boiler wall to complete the layout, and the flame length of the burner distribution head is short, only suspended in the space 200mm behind the combustion plane, so it needs smaller hearth space. In addition, the planar burner has a large adjustment ratio, the flame is uniform and the flame temperature is lower than 1100℃, which helps to inhibit the generation of thermal nitrogen oxides, so that the nitrogen oxide emission is lower than 30mg, meeting the latest environmental protection standards.

[0004] However, the traditional steam boiler has certain deficiencies in structure and performance. For example, the water wall tube design of some boilers is not reasonable, which cannot effectively reduce the flame temperature and flue gas emission temperature, resulting in high nitrogen oxide emission, which does not meet the environmental protection requirements. At the same time, the structure of some boilers is complex, the production difficulty is large, the manufacturing cost is high, and the volume is large, which is not conducive to transportation and installation. Therefore, a new type of low nitrogen combustion gas steam boiler is needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a low nitrogen combustion gas steam boiler to solve the problems of the water wall tube design of some boilers being not reasonable, which cannot effectively reduce the flame temperature and flue gas emission temperature, resulting in high nitrogen oxide emission, which does not meet the environmental protection requirements in the above background art.

[0006] To achieve the above purpose, the utility model provides a low nitrogen combustion gas steam boiler, which comprises a furnace body, the top of the furnace body is provided with an upper furnace body, the bottom of the furnace body is provided with a lower furnace body, the upper furnace body comprises an upper cylinder, the top of the upper cylinder is provided with an upper head, the bottom of the upper cylinder is provided with an upper tube plate, the lower furnace body comprises a lower cylinder, the bottom of the lower cylinder is provided with a lower head, the top of the lower head is provided with a lower tube plate, the middle part of the furnace body is provided with a hearth, and the first water wall tube, the second water wall tube and the third water wall tube are sequentially arranged in the hearth, and the first water wall tube, the second water wall tube and the third water wall tube are communicated with the upper cylinder and the lower cylinder.

[0007] Preferably, the top of the upper furnace body is sequentially provided with a main steam valve, a safety valve and a pressure gauge.

[0008] Preferably, one side of the upper furnace body is provided with a water level gauge, and the other side of the upper furnace body is connected with a feed water pipe provided with a feed water pump.

[0009] Preferably, one side of the furnace body is connected with a burner, and the other side of the furnace body is connected with an exhaust pipe.

[0010] Preferably, the first water cooling wall pipe is located at the side of the furnace chamber close to the injection port of the burner, the second water cooling wall pipe is located at the side of the furnace chamber close to the front end of the flame of the burner, and the third water cooling wall pipe is located at the side of the furnace chamber close to the exhaust pipe.

[0011] Preferably, the bottom of the lower furnace body is connected with a blowdown pipe provided with a blowdown valve.

[0012] Preferably, the first water cooling wall pipe, the second water cooling wall pipe and the third water cooling wall pipe are all vertically arranged at equal intervals.

[0013] Preferably, the internal width of the furnace body is greater than the interface width of the burner and the exhaust pipe.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] In the low-nitrogen combustion gas steam boiler, the first water cooling wall pipe, the second water cooling wall pipe and the third water cooling wall pipe are arranged reasonably, the flame temperature and the flue gas emission temperature are effectively reduced, the generation of thermal nitrogen oxides is inhibited, the nitrogen oxide emission is lower than the environmental protection standard, and the latest environmental protection requirement is met.

[0016] The boiler adopts the split type design of the upper furnace body, the furnace body and the lower furnace body, and the vertically arranged water cooling wall pipes at equal intervals, so that the structure of the boiler is more simple and compact, the production difficulty and the manufacturing cost are greatly reduced, and the transportation and installation are facilitated.

[0017] The first water cooling wall pipe is located at the side of the injection port of the burner, the flame temperature is effectively reduced, the second water cooling wall pipe is located at the front end of the flame, a large amount of heat is absorbed through radiation heat exchange, the third water cooling wall pipe is located at the side of the exhaust pipe, the flue gas emission temperature is further reduced through convection heat exchange, and the heat exchange efficiency of the boiler is improved.

[0018] The main steam valve, the safety valve and the pressure gauge are sequentially installed on the top of the upper furnace body, the running state of the boiler can be monitored in real time, and the boiler can be ensured to run under the safe pressure; meanwhile, the water level gauge is installed on the side of the upper furnace body, the water level of the boiler can be observed at any time, and the normal running of the boiler is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is one of the overall structure schematic views of the utility model;

[0020] Fig. 2 It is the second overall structure schematic view of the utility model;

[0021] Fig. 3 It is the internal structure schematic view in the utility model;

[0022] The meanings of the various reference numerals in the drawings are as follows:

[0023] 1, furnace body; 11, first water cooled wall pipe; 12, second water cooled wall pipe; 13, third water cooled wall pipe; 2, upper furnace body; 21, upper cylinder body; 22, upper end cover; 23, upper tube plate; 24, water supply pipe; 3, lower furnace body; 31, lower cylinder body; 32, lower end cover; 33, lower tube plate; 34, blowdown pipe; 4, main steam valve; 5, safety valve; 6, pressure gauge; 7, water level gauge; 8, burner; 9, smoke exhaust pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] The utility model provides a kind of low-nitrogen combustion gas steam boiler, such as Figs. 1-3As shown, including furnace body 1, the top of furnace body 1 is mounted with upper furnace body 2, the bottom of furnace body 1 is mounted with lower furnace body 3, upper furnace body 2 includes upper cylinder 21, the top of upper cylinder 21 is mounted with upper head 22, the bottom of upper cylinder 21 is mounted with upper tube plate 23, lower furnace body 3 includes lower cylinder 31, the bottom of lower cylinder 31 is mounted with lower head 32, the top of lower head 32 is mounted with lower tube plate 33, the middle of furnace body 1 is provided with hearth, the hearth is provided with first water cooling wall pipe 11, second water cooling wall pipe 12 and third water cooling wall pipe 13 in turn, first water cooling wall pipe 11, second water cooling wall pipe 12 and third water cooling wall pipe 13 communicate upper cylinder 21 and lower cylinder 31. Furnace body 1 is the main part of the boiler, the top of which is mounted with upper furnace body 2, and the bottom of which is mounted with lower furnace body 3, forming a stable overall structure. Upper furnace body 2 includes upper cylinder 21, upper head 22 and upper tube plate 23, and lower furnace body 3 includes lower cylinder 31, lower head 32 and lower tube plate 33, which makes the assembly and maintenance of the boiler more convenient. The middle of furnace body 1 is provided with hearth, which is the main area of the boiler for combustion and heat exchange. The hearth is provided with first water cooling wall pipe 11, second water cooling wall pipe 12 and third water cooling wall pipe 13 in turn, and the three groups of water cooling wall pipes communicate upper cylinder 21 and lower cylinder 31, forming a complete heat exchange system.

[0026] In this embodiment, the top of upper furnace body 2 is sequentially mounted with main steam valve 4, safety valve 5 and pressure gauge 6. Main steam valve 4 at the top of upper furnace body 2 is used to control the output of steam, safety valve 5 ensures that the boiler operates at a safe pressure to prevent overpressure accidents, and pressure gauge 6 monitors the pressure inside the boiler in real time. This design ensures the safety and controllability of the boiler operation.

[0027] Specifically, one side of upper furnace body 2 is mounted with water level gauge 7, and the other side of upper furnace body 2 is connected with water supply pipe 24, and water supply pump is mounted on water supply pipe 24. Water level gauge 7 is used to monitor the water level in the boiler in real time, ensuring that the boiler operates within the normal water level range. The cooperation of water supply pipe 24 and water supply pump provides stable water inflow for the boiler, ensuring the continuous operation of the boiler and the generation of steam.

[0028] Further, one side of furnace body 1 is connected with combustor 8, and the other side of furnace body 1 is connected with exhaust pipe 9. Combustor 8 provides the equipment needed for fuel combustion of the boiler, ensuring that the fuel is fully burned to generate heat. Exhaust pipe 9 is used to discharge flue gas generated after combustion, ensuring the cleanliness and normal operation of the boiler.

[0029] Further, the first water cooling wall pipe 11 is located at the side of the furnace close to the injection port of the burner 8, the second water cooling wall pipe 12 is located at the side of the furnace close to the flame front of the burner 8, and the third water cooling wall pipe 13 is located at the side of the furnace close to the smoke exhaust pipe 9. The reasonable arrangement of the first water cooling wall pipe 11, the second water cooling wall pipe 12 and the third water cooling wall pipe 13 can effectively absorb the heat generated in the combustion process, reduce the flame temperature and the flue gas emission temperature. Especially, the first water cooling wall pipe 11 is close to the injection port of the burner 8, which can quickly absorb the heat in the initial stage of combustion, help to inhibit the generation of thermal nitrogen oxides, and realize low-nitrogen combustion.

[0030] Further, the bottom of the lower furnace body 3 is connected with a blowdown pipe 34, and a blowdown valve is installed on the blowdown pipe 34. The cooperation of the blowdown pipe 34 and the blowdown valve is used for periodic discharge of dirt and sediment in the boiler, maintains the cleanliness of the inside of the boiler, prevents the influence of dirt on the operation of the boiler, and prolongs the service life of the boiler.

[0031] Further, the first water cooling wall pipe 11, the second water cooling wall pipe 12 and the third water cooling wall pipe 13 are all a plurality of vertically arranged pipes. The plurality of vertically arranged water cooling wall pipes increase the heat exchange area of the boiler and improve the heat exchange efficiency. At the same time, the equal interval arrangement makes the water flow distribution more uniform, ensuring the stable operation of the boiler.

[0032] Further, the internal width of the furnace body 1 is greater than the interface width of the burner 8 and the smoke exhaust pipe 9. The internal width of the furnace body 1 is greater than the interface width of the burner 8 and the smoke exhaust pipe 9, which provides sufficient space for the installation of the burner 8 and the smoke exhaust pipe 9, facilitates the installation and maintenance of the equipment. At the same time, it also ensures the smooth ventilation of the inside of the boiler, which is beneficial to the emission of flue gas and the combustion.

[0033] The low-nitrogen combustion gas steam boiler of the utility model in use, first, the boiler main body is composed of the furnace body 1, the furnace body 1 top is equipped with the upper furnace body 2, bottom is equipped with the lower furnace body 3. The upper furnace body 2 includes upper cylinder 21, upper head 22 and upper tube sheet 23, the lower furnace body 3 includes lower cylinder 31, lower head 32 and lower tube sheet 33, forms stable split type structure, facilitates assembly and maintenance. The furnace body 1 middle part is equipped with the furnace, is the main area of combustion and heat exchange. The furnace is sequentially provided with the first water cooling wall pipe 11, the second water cooling wall pipe 12 and the third water cooling wall pipe 13, and the three groups of water cooling wall pipes are communicated with the upper cylinder 21 and the lower cylinder 31, and form a complete heat exchange system.

[0034] The top of the upper furnace body 2 is sequentially equipped with a main steam valve 4, a safety valve 5, and a pressure gauge 6. The main steam valve 4 controls the steam output, the safety valve 5 ensures the boiler operates under safe pressure to prevent overpressure accidents, and the pressure gauge 6 monitors the internal pressure of the boiler in real time. A water level gauge 7 is installed on one side of the upper furnace body 2 to monitor the water level inside the boiler in real time and ensure that the boiler operates within the normal water level range. A feedwater pipe 24 is connected to the other side of the upper furnace body 2, and a feedwater pump is installed on the feedwater pipe 24 to provide a stable supply of water to the boiler, ensuring continuous boiler operation and steam generation.

[0035] A burner 8 is connected to one side of the furnace body 1, providing the necessary equipment for fuel combustion in the boiler and ensuring that the fuel is fully burned to generate heat. A flue pipe 9 is connected to the other side of the furnace body 1 to discharge the flue gas produced after combustion, ensuring the cleanliness of the boiler interior and its normal operation.

[0036] The first water-cooled wall tube 11 is located in the furnace near the injection port of the burner 8, rapidly absorbing heat in the initial stage of combustion, helping to suppress the formation of thermal nitrogen oxides and achieve low-NOx combustion. The second water-cooled wall tube 12 is located in the furnace near the flame front of the burner 8, absorbing heat generated by the flame through radiative heat exchange. The third water-cooled wall tube 13 is located in the furnace near the exhaust pipe 9, further absorbing heat from the flue gas through convective heat exchange, reducing the flue gas emission temperature. The first water-cooled wall tube 11, the second water-cooled wall tube 12, and the third water-cooled wall tube 13 are all multiple vertically arranged pipes at equal intervals, increasing the boiler's heat exchange area, improving heat exchange efficiency, and making the water flow distribution more uniform, ensuring stable boiler operation.

[0037] A drain pipe 34 is connected to the bottom of the lower furnace body 3, and a drain valve is installed on the drain pipe 34. Regularly draining the scale and sediment inside the boiler keeps the boiler clean, prevents scale from affecting boiler operation, and extends the boiler's service life.

[0038] Burner 8 injects fuel into the furnace for combustion, generating heat. The first water-cooled wall tube 11, the second water-cooled wall tube 12, and the third water-cooled wall tube 13 sequentially absorb the heat generated during combustion, reducing the flame temperature and flue gas emission temperature. The feedwater pump provides a stable supply of water to the upper furnace body 2 through feedwater pipe 24. After absorbing heat in the water-cooled wall tubes, the water flows into the lower furnace body 3, where it evaporates into steam. The steam rises and enters the upper furnace body 2, outputting steam through the main steam valve 4. Safety valve 5 and pressure gauge 6 ensure the boiler operates under safe pressure, while water level gauge 7 monitors the water level inside the boiler. The flue gas generated after combustion is discharged from the boiler through exhaust pipe 9, keeping the boiler interior clean. Scale and sediment inside the boiler are periodically discharged through drain pipe 34 to maintain the boiler in good operating condition.

[0039] Finally, it needs to be explained that the burner 8 in the embodiment, etc., the electronic components in the above components are all general standard components or components known to those skilled in the art, the structure and principle are known to those skilled in the art through technical manual or through conventional experimental method, all the above electrical devices are connected through the wire respectively in the idle place of the device, the specific connecting means should be referred to the working order between the electrical devices in the above working principle to complete the electrical connection, which are all the prior art.

[0040] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and do not limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A low NOx combustion gas and steam boiler comprising a furnace (1), characterized in that: The top of the furnace body (1) is provided with an upper furnace body (2), and the bottom of the furnace body (1) is provided with a lower furnace body (3), the upper furnace body (2) comprises an upper cylinder (21), the top of the upper cylinder (21) is provided with an upper head (22), the bottom of the upper cylinder (21) is provided with an upper tube plate (23), the lower furnace body (3) comprises a lower cylinder (31), the bottom of the lower cylinder (31) is provided with a lower head (32), the top of the lower head (32) is provided with a lower tube plate (33), the middle part of the furnace body (1) is provided with a hearth, and the hearth is sequentially provided with a first water cooling wall pipe (11), a second water cooling wall pipe (12) and a third water cooling wall pipe (13), the first water cooling wall pipe (11), the second water cooling wall pipe (12) and the third water cooling wall pipe (13) are communicated with the upper cylinder (21) and the lower cylinder (31).

2. The low NOx combustion gas and steam fired boiler of claim 1, wherein: The top of the upper furnace body (2) is sequentially provided with a main steam valve (4), a safety valve (5) and a pressure gauge (6).

3. The low NOx combustion gas and steam fired boiler of claim 1, wherein: One side of the upper furnace body (2) is provided with a water level meter (7), and the other side of the upper furnace body (2) is connected with a feed water pipe (24), and the feed water pipe (24) is provided with a feed water pump.

4. The low NOx combustion gas and steam fired boiler of claim 1, wherein: One side of the furnace body (1) is connected with a burner (8), and the other side of the furnace body (1) is connected with an exhaust pipe (9).

5. The low NOx combustion gas and steam fired boiler of claim 4, wherein: The first water cooling wall pipe (11) is located on one side of the hearth close to the injection port of the burner (8), the second water cooling wall pipe (12) is located on one side of the hearth close to the front end of the flame of the burner (8), and the third water cooling wall pipe (13) is located on one side of the hearth close to the exhaust pipe (9).

6. The low NOx combustion gas and steam fired boiler of claim 1, wherein: The bottom of the lower furnace body (3) is connected with a blowdown pipe (34), and the blowdown pipe (34) is provided with a blowdown valve.

7. The low NOx combustion gas and steam fired boiler of claim 1, wherein: The first water cooling wall pipe (11), the second water cooling wall pipe (12) and the third water cooling wall pipe (13) are all a plurality of vertically arranged pipes.

8. The low NOx combustion gas and steam fired boiler of claim 4, wherein: The internal width of the furnace body (1) is greater than the interface width of the burner (8) and the exhaust pipe (9).

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