Full-premixing steam boiler

Abstract

The invention discloses a full premixing steam boiler which comprises a boiler body, a venturi device and an air blower which are sequentially connected with the boiler body are arranged on one side of the boiler body, an energy saver and a chimney which are connected with the boiler body are sequentially arranged at the other end, away from the venturi device and the air blower, of the boiler body, and a smoke inlet is formed in the joint of the boiler body and the venturi device. A combustion finned tube and a convection bank are arranged in an inner cavity of the boiler body, and a smoke outlet formed in one side of the boiler body is formed in one side of the convection bank. The boiler has the beneficial effects that mixed gas is further uniformly mixed in the flue gas inlet and then is ignited after passing through the combustion finned tubes, and a steam-water mixture circulating in the finned tubes can cool combustion flames, so that generation of thermal NOx is reduced, ultralow nitrogen is achieved during combustion, flue gas generated during combustion passes through the convection bank from the hearth, and the combustion efficiency is improved. The boiler flue gas temperature reduction device is simple in structure and more sufficient in combustion.

Description

Technical Field

[0001] The invention relates to the technical field of steam boilers, in particular to a full premixed steam boiler. Background Art

[0002] Water-cooled premixed technology is becoming more and more mature, and water-cooled premixed steam boilers are gradually entering the market. However, the water-cooled premixed steam boilers on the market currently have the following problems: 1. Due to the overall structural limitations, the maximum can only reach 20 tons, which cannot meet the requirements of some users who need large boilers. 2. The overall structure is complex, the floor space is large, and the cost is high; 3. The NOx emissions during the production process are large, and direct emissions will pollute the environment, and the emissions after treatment will increase the cost of use. Summary of the invention

[0003] The object of the present invention is to provide a full premix steam boiler to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fully premixed steam boiler, comprising a boiler body, one side of the boiler body is provided with a venturi device and a blower connected thereto in sequence, the other end of the boiler body away from the venturi device and the blower is provided with an economizer and a chimney connected thereto in sequence, a flue gas inlet is provided at the connection between the boiler body and the venturi device, a combustion fin tube and a convection tube bundle are provided in the inner cavity of the boiler body, and one side of the convection tube bundle is provided with a flue gas outlet arranged on one side of the boiler body.

[0005] For further optimization, an upper end and a lower end of the boiler body are respectively provided with an upper head and a lower head.

[0006] Further optimized, the boiler body is composed of an upper cylinder and a lower cylinder, and the combustion fin tubes and the convection tube bundle are arranged in the middle thereof, and a support is arranged at the bottom of the lower cylinder.

[0007] For further optimization, a steam-water separation device is provided at the upper end of the upper cylinder.

[0008] Further optimized, the top of the upper cylinder is respectively provided with a first tube seat, a second tube seat, a third tube seat, a fourth tube seat, a fifth tube seat, a sixth tube seat and a seventh tube seat.

[0009] Further optimized, the first pipe seat is provided with a pressure gauge and a pressure control device, the second pipe seat is provided with an extremely low-level liquid controller, and the sixth pipe seat and the seventh pipe seat are both provided with safety valves.

[0010] Further optimized, the steam-water separation device is connected to the main steam pipe arranged on the end surface of the upper cylinder.

[0011] For further optimization, a water supply pipe seat and a water outlet pipe seat are respectively provided on one side of the upper cylinder, and an eighth pipe seat and a ninth pipe seat are respectively provided on the other side of the upper cylinder away from the water supply pipe seat and the surface sewage pipe seat, on which a ground liquid level meter and a remote liquid level control device are respectively provided.

[0012] Further optimized, the top of the economizer is provided with an economizer smoke inlet, which is connected to the smoke outlet, the lower end of the economizer smoke inlet is provided with an economizer fin tube, and the lower end of the economizer fin tube is provided with an economizer smoke outlet connected to the chimney.

[0013] For further optimization, an energy saver water inlet pipe seat and a tenth pipe seat are respectively provided at the upper and lower ends of one side of the energy saver.

[0014] Beneficial Effects

[0015] In the fully premixed steam boiler provided by the present invention, the mixed gas is further mixed evenly in the flue gas inlet and then ignited after passing through the combustion fin tubes. The steam-water mixture circulating in the fin tubes can cool the combustion flame, thereby reducing the generation of thermal NOx and achieving ultra-low nitrogen combustion. The flue gas generated by the combustion passes through the convection tube bundle from the furnace to further reduce the flue gas temperature before being discharged from the flue gas outlet of the boiler body, thereby reducing the NOx emission in the production process as a whole. The structure is simple and the combustion is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the boiler body structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the top view of the structure of the boiler body of the present invention;

[0019] Figure 4 It is a schematic diagram of the overall structure of the energy saver of the present invention. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] Example

[0022] like Figure 1-4As shown, a full premixed steam boiler comprises a boiler body 3, one side of the boiler body 3 is provided with a venturi device 2 and a blower 1 connected thereto in sequence, the other end of the boiler body 3 away from the venturi device 2 and the blower 1 is provided with an economizer 4 and a chimney 5 connected thereto in sequence, a flue gas inlet 9 is provided at the connection between the boiler body 3 and the venturi device 2, a combustion fin tube 10 and a convection tube bundle 12 are provided in the inner cavity of the boiler body 3, and one side of the convection tube bundle 12 is provided with a flue gas outlet 14 arranged on one side of the boiler body 3.

[0023] In this embodiment, an upper end and a lower end of the boiler body 3 are respectively provided with an upper head 27 and a lower head 7, and manholes are provided on the upper head and the lower head to facilitate manual maintenance of the cylinder.

[0024] The boiler body 3 is composed of an upper cylinder 11 and a lower cylinder 8, and the combustion fin tubes 10 and the convection tube bundle 12 are arranged in the middle thereof. A support 6 is arranged at the bottom of the lower cylinder 8. The steam-water mixture flowing in the fin tubes can cool the combustion flame, thereby reducing the generation of thermal NOx and achieving ultra-low nitrogen combustion.

[0025] A steam-water separation device 13 is provided at the upper end of the upper cylinder 11. The steam-water separation device 13 ensures that the humidity of the steam meets the standard. The separated steam is transported to the user from the main steam pipe.

[0026] A first tube seat 16 , a second tube seat 17 , a third tube seat 18 , a fourth tube seat 19 , a fifth tube seat 20 , a sixth tube seat 21 and a seventh tube seat 29 are respectively provided at the top of the upper cylinder 11 .

[0027] The first pipe seat 16 is provided with a pressure gauge and a pressure control device, the second pipe seat 17 is provided with an extremely low liquid level controller, and the sixth pipe seat 21 and the seventh pipe seat 29 are both provided with safety valves, which are respectively used to control the liquid level of the boiler, adjust the boiler load, ensure the safe operation of the boiler and prevent the boiler from overpressure.

[0028] The steam-water separation device 13 is connected to a main steam pipe 20 disposed on the end surface of the upper cylinder 11, and the separated steam is transported to the user from the main steam pipe.

[0029] A water supply pipe seat 19 and a water outlet pipe seat 18 are respectively provided on one side of the upper cylinder 11, and an eighth pipe seat 15 and a ninth pipe seat 28 are respectively provided on the other side of the upper cylinder 11 away from the water supply pipe seat 19 and the surface sewage pipe seat 18, on which a ground liquid level meter and a remote liquid level control device are respectively provided.

[0030] An economizer smoke inlet 22 is provided at the top of the economizer 4, which is connected to the smoke outlet 14. An economizer fin tube 23 is provided at the lower end of the economizer smoke inlet 22. An economizer smoke outlet 24 connected to the chimney 5 is provided at the lower end of the economizer fin tube 23. The smoke exchanges heat with the economizer fin tube and is discharged into the chimney from the economizer smoke outlet.

[0031] An economizer water inlet pipe seat 26 and a tenth pipe seat 25 are respectively provided at the upper and lower ends of one side of the economizer 4. Normal temperature feed water enters the economizer water inlet pipe seat 26, enters the fin tube and flue gas for countercurrent heat exchange, and after the feed water is heated, it comes out from the pipe seat 25 and enters the boiler body water feed pipe seat 19.

[0032] Overall structural working process:

[0033] The air from the blower enters the Venturi device to mix with natural gas. The mixed gas from the Venturi device enters the boiler body and is ignited and burned in the furnace. The flue gas produced by the combustion heats the boiler water into steam. The flue gas after heat exchange and cooling comes out of the boiler body and enters the economizer to heat the boiler feed water. The flue gas from the economizer enters the chimney and is discharged into the atmosphere.

[0034] The mixed gas is further mixed evenly at the flue gas inlet and then ignited after passing through the combustion fin tubes. The steam-water mixture flowing in the fin tubes can cool the combustion flame, thereby reducing the generation of thermal NOx and achieving ultra-low nitrogen combustion. The flue gas generated by the combustion passes through the convection tube bundle from the furnace, further reducing the flue gas temperature and then is discharged from the flue gas outlet of the boiler body.

[0035] The entire boiler body is supported by a support; the boiler feed water enters the upper cylinder through the feed water pipe seat, and the feed water circulates naturally between the upper cylinder, fin tubes, convection tube bundles, and lower cylinder to generate steam. The generated steam is separated from water by a steam-water separation device to ensure that the humidity of the steam meets the standard. The separated steam is transported to the user from the main steam pipe.

[0036] The upper and lower heads are equipped with manholes for easy maintenance; the eighth and ninth pipe seats are equipped with ground level gauges and remote level control devices to control the liquid level of the boiler; the first pipe seat is equipped with a pressure gauge and a pressure control device to adjust the boiler load; the second pipe seat is equipped with an extremely low liquid level control to ensure the safe operation of the boiler. Safety valves are set on the sixth and seventh pipe seats to prevent overpressure during boiler operation.

[0037] The flue gas from the boiler body enters the smoke inlet of the economizer, and then the flue gas exchanges heat with the finned tubes of the economizer and is discharged into the chimney from the smoke outlet of the economizer.

[0038] The normal temperature feed water enters the economizer water inlet pipe seat, enters the finned tube and performs countercurrent heat exchange with the flue gas. After the feed water is heated, it comes out from the tenth pipe seat and enters the boiler body water feed pipe seat.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the invention content within the protection scope of the present invention.

Claims

1. A fully premixed steam boiler, characterized in that: The invention comprises a boiler body (3), one side of the boiler body (3) is provided with a venturi device (2) and a blower (1) connected thereto in sequence, the other end of the boiler body (3) away from the venturi device (2) and the blower (1) is provided with an economizer (4) and a chimney (5) connected thereto in sequence, a smoke inlet (9) is provided at the connection between the boiler body (3) and the venturi device (2), a combustion fin tube (10) and a convection tube bundle (12) are provided in the inner cavity of the boiler body (3), and one side of the convection tube bundle (12) is provided with a smoke outlet (14) arranged on one side of the boiler body (3).

2. The fully premixed steam boiler according to claim 1, characterized in that: An upper end and a lower end of the boiler body (3) are respectively provided with an upper end cover (27) and a lower end cover (7).

3. The fully premixed steam boiler according to claim 1, characterized in that: The boiler body (3) is composed of an upper cylinder (11) and a lower cylinder (8), and the combustion fin tubes (10) and the convection tube bundle (12) are arranged in the middle thereof, and a support (6) is arranged at the bottom of the lower cylinder (8).

4. The fully premixed steam boiler according to claim 3, characterized in that: A steam-water separation device (13) is provided at the upper end of the upper cylinder (11).

5. The fully premixed steam boiler according to claim 3, characterized in that: The top of the upper cylinder (11) is respectively provided with a first tube seat (16), a second tube seat (17), a third tube seat (18), a fourth tube seat (19), a fifth tube seat (20), a sixth tube seat (21) and a seventh tube seat (29).

6. The fully premixed steam boiler according to claim 5, characterized in that: The first pipe seat (16) is provided with a pressure gauge and a pressure control device, the second pipe seat (17) is provided with an extremely low-level liquid controller, and the sixth pipe seat (21) and the seventh pipe seat (29) are both provided with safety valves.

7. The fully premixed steam boiler according to claim 3, characterized in that: The steam-water separation device (13) is connected to a main steam pipe (20) arranged on the end surface of the upper cylinder (11).

8. The fully premixed steam boiler according to claim 3, characterized in that: A water supply pipe seat (19) and a water outlet pipe seat (18) are respectively provided on one side of the upper cylinder (11), and an eighth pipe seat (15) and a ninth pipe seat (28) are respectively provided on the other side of the upper cylinder (11) away from the water supply pipe seat (19) and the surface sewage discharge pipe seat (18), on which a ground level meter and a remote liquid level control device are respectively provided.

9. The fully premixed steam boiler according to claim 1, characterized in that: The top of the economizer (4) is provided with an economizer smoke inlet (22) which is connected to the smoke outlet (14); the lower end of the economizer smoke inlet (22) is provided with an economizer fin tube (23); the lower end of the economizer fin tube (23) is provided with an economizer smoke outlet (24) which is connected to the chimney (5).

10. The fully premixed steam boiler according to claim 1, characterized in that: An energy saver water inlet pipe seat (26) and a tenth pipe seat (25) are respectively provided at the upper and lower ends of one side of the energy saver (4).

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