A double-drum sedimentation denitration chamber jet bottom air intake gas and oil-fired angle tube boiler

Abstract

The present invention discloses a double-drum sedimentation denitration chamber spraying lower air intake gas and oil angle tube boiler, comprising a boiler furnace part and a combustion system part. A support structure is arranged in the boiler body, and the support structure comprises a vertically arranged front support downcomer, an intermediate support downcomer, and a rear support downcomer; a drum is arranged above one side of the boiler body, and a water inlet pipe is connected to the drum, and a downcomer connected to the front support downcomer, the intermediate support downcomer, and the rear support downcomer is connected to the bottom of the drum, and a front and rear arch lower header is connected to the bottom of the front support downcomer, and a front and rear arch upper header connected to the front and rear arch lower header is arranged above the boiler body, and the front and rear arch upper header is connected to the drum through an upper return water pipe. The fuel residence time is long, the flame can extend freely, the fuel is fully burned, the support structure and water circulation are safe, nitrogen oxide emissions are reduced, the thermal efficiency of the boiler is improved, and the structure is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and in particular to a double-drum settling denitration chamber spraying lower air intake gas and oil-fired angle tube boiler which can meet the emission requirements of national boiler air pollutant emission standards and solve the problems of insufficient fuel combustion, high nitrogen oxide emission concentration and environmental pollution. Background Art

[0002] As we all know, current gas and oil boilers generally have side air intake, a short front-to-back distance between the combustion chambers, a low height of the combustion chambers, a small volume of the combustion chambers, no settling and denitrification chambers, and unsafe supporting structures and water circulation. This structure causes the flue gas to stay for a short time and needs to turn to enter the upper part of the furnace, the flame cannot extend freely, the gas burns unevenly, the fuel burns incompletely, the flue gas filling degree in the combustion chamber is not high, the nitrogen oxide emission concentration is high, the flue gas directly washes the rear wall of the furnace, causing severe wear and tear, the dust cannot settle, the heating area is small, the service life is low, the maintenance rate is high, and the use cost is increased. As the national environmental protection policy becomes increasingly stringent, the well-known boiler with this structure cannot meet the national emission requirements for boiler air pollution emission standards, the nitrogen oxide concentration is high, and it pollutes the environment. Therefore, how to solve the problems of boiler without settling chamber and dust sedimentation, short flue gas residence time, flame cannot extend freely, uneven gas combustion, incomplete fuel combustion, low combustion chamber fullness, flue gas directly flushing the rear wall of the furnace, reducing wear, and solving the small heating area, unsafe supporting structure and water circulation, extending the service life of the boiler, reducing the number of maintenance times, reducing the cost of use, and reducing the emission of nitrogen oxides, has become an urgent problem that needs to be solved. Summary of the invention

[0003] The object of the present invention is to provide a double-drum sedimentation denitrification chamber injection lower air intake gas and oil-fired angle tube boiler with a sedimentation denitrification chamber and an inclined injection lower air intake combustion chamber, so as to solve the problems existing in the above-mentioned prior art, so that the fuel residence time is long, the flame can extend freely, the fuel can be fully burned, the emission of nitrogen oxides is reduced, the supporting structure is stable, and the water circulation is safe.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a double-drum settling denitration chamber spraying lower air intake gas and oil angle tube boiler, comprising a boiler furnace part and a combustion system part. A support structure is arranged inside the boiler body, and the support structure comprises a vertically arranged front side support downcomer, an intermediate support downcomer, and a rear side support downcomer; both ends of the front side support downcomer, the intermediate support downcomer, and the rear side support downcomer are respectively connected to a horizontally arranged side water-cooled wall upper header and a side water-cooled wall lower header, a drum is arranged above one side of the boiler body, a water inlet pipe is connected to the drum, a downcomer connected to the front side support downcomer, the intermediate support downcomer, and the rear side support downcomer is connected to the bottom of the drum, and a front and rear arch lower header is connected to the bottom of the front support downcomer, and a front and rear arch upper header connected to the front and rear arch lower header is arranged above the boiler body, and the front and rear arch upper header is connected to the drum through an upper return water pipe.

[0006] Optionally, the combustion system includes an inclined lower air intake furnace, which includes a front arch water-cooled wall, a rear arch water-cooled wall, and a side water-cooled wall. The upper ends of the front arch water-cooled wall and the rear arch water-cooled wall are respectively connected to the front and rear arch upper headers, the lower ends of the front arch water-cooled wall and the rear arch water-cooled wall are respectively connected to the front and rear arch lower headers, the upper ends of the side water-cooled walls are respectively connected to the side water-cooled wall upper headers, the lower ends of the side water-cooled walls are respectively connected to the side water-cooled wall lower headers, an air inlet is bent below the front arch water-cooled wall, and a burner is provided at the air inlet; A channel rear wall water-cooled wall is arranged outside the rear arch water-cooled wall, the upper end of the channel rear wall water-cooled wall is connected to the upper header of the channel rear wall water-cooled wall, the lower end of the channel rear wall water-cooled wall is connected to the lower header of the channel rear wall water-cooled wall, the upper header of the channel rear wall water-cooled wall is connected to the upper return water pipe and returns to the upper boiler drum, a convection tube bundle is arranged outside the channel rear wall water-cooled wall, the upper end of the convection tube bundle is connected to the upper boiler drum, the lower end of the convection tube bundle is connected to the lower boiler drum, smoke flow openings are opened above the rear arch water-cooled wall, below the channel rear wall, and above the convection tube bundle, and a smoke outlet is opened below the convection tube bundle.

[0007] Optionally, the sedimentation and denitrification chamber includes an upper sedimentation and denitrification chamber and a lower sedimentation and denitrification chamber, the upper sedimentation and denitrification chamber is composed of a section surrounded by a rear arch water-cooled wall, a channel rear wall water-cooled wall and a side water-cooled wall; the lower sedimentation and denitrification chamber is composed of a channel rear wall water-cooled wall, a convection tube bundle and a side water-cooled wall, the flue gas flow port is located above the rear arch water-cooled wall, below the channel rear wall and above the convection tube bundle, and the flue gas outlet is located at the bottom of the convection tube bundle.

[0008] Optionally, the denitrification spray gun is arranged in the upper middle part of the upper sedimentation denitrification chamber.

[0009] Optionally, a convection tube bundle is provided between the upper drum and the lower drum, and the smoke outlet is located at the lower part of the convection tube bundle.

[0010] Optionally, a first throttle ring is provided on the front support down tube, a second throttle ring is provided on the middle support down tube, and a third throttle ring is provided on the rear support down tube.

[0011] Optionally, symmetrically arranged supports are installed at the bottom of the side wall lower header.

[0012] Compared with the prior art, the present invention has achieved the following technical effects:

[0013] The present invention provides a double-drum sedimentation denitration chamber jet lower air intake gas and oil-fired angle tube boiler, which has an inclined jet lower air intake combustion chamber and a sedimentation denitration spray chamber designed on the boiler body, so that the fuel residence time is long, the flame can extend freely, the fuel can be fully burned, the dust can be naturally settled, the supporting structure and water circulation are safe, the emission of nitrogen oxides is reduced, the thermal efficiency of the boiler is improved, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a structural front view of the double-drum sedimentation denitration chamber spray lower air intake gas and oil-fired angle tube boiler of the present invention, and is an embodiment of the present invention.

[0016] Figure 2 This is a structural front view of the second embodiment of the double-drum sedimentation denitration chamber spray lower air intake gas and oil-fired angle tube boiler of the present invention.

[0017] In the figure: 1 boiler body, 2 side water-cooled wall upper header, 3 furnace upper part, 4 first throttle ring, 5 side water-cooled wall, 6 front arch water-cooled wall, 7 inclined lower air inlet furnace lower part, 8 gas (oil) inlet, 9 support, 10 side water-cooled wall lower header, 11 burner, 12 front and rear arch lower header, 13 rear arch water-cooled wall, 14 channel rear wall water-cooled wall, 15 front side support downcomer, 16 front and rear arch upper header, 17 channel rear wall upper header, 18 upper return water pipe, 19 upper sedimentation denitration chamber, 20 middle support downcomer, 21 water outlet pipe, 22 water inlet pipe, 23 upper drum, 24 side downcomer, 25 rear downcomer, 26 front downcomer, 27 rear side support downcomer, 28 convection tube bundle, 29 lower sedimentation denitration chamber, 30 flue gas outlet, 31 lower boiler drum, 32 lower header on the rear wall of the channel, 34 second throttling ring, 35 third throttling ring, 36 denitrification spray gun. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] The object of the present invention is to provide a double-drum sedimentation denitrification chamber injection lower air intake gas and oil-fired angle tube boiler with a sedimentation denitrification chamber and an inclined injection lower air intake combustion chamber, so as to solve the problems existing in the above-mentioned prior art, so that the fuel residence time is long, the flame can extend freely, the fuel can be fully burned, the emission of nitrogen oxides is reduced, the supporting structure is stable, and the water circulation is safe.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Embodiment 1

[0022] The present invention provides a double-drum sedimentation denitration chamber spraying lower air intake gas and oil-fired angle tube boiler, such as Figure 1 As shown, it includes a boiler furnace part and a combustion system part. The boiler furnace part includes a boiler body 1, six front side support downcomers 15 with supporting and descending functions arranged vertically around the boiler body 1, a first throttle ring 4, an intermediate support downcomer 20, a second throttle ring 34, a rear side support downcomer 27, and a third throttle ring 35, an upper drum 23 and a lower drum 31 arranged at the upper right part of the boiler body 1, a convection tube bundle 28 between the upper drum and the lower drum, a water inlet pipe 22 and a water outlet pipe 21 connected to the upper drum 23, a front downcomer 26, a side downcomer 31, and a combustion system part. The boiler body is provided with a plurality of pipes 24, a rear downcomer 25, an upper return pipe 18, a side water-cooled wall 5, a side water-cooled wall lower header 10, a side water-cooled wall upper header 2, a furnace upper part 3, an inclined lower air inlet furnace lower part 7, a front arch water-cooled wall 6, a rear arch water-cooled wall 13, a front and rear arch lower header 12, a front and rear arch upper header 16, a channel rear wall lower header 32, a channel rear wall upper header 17, a channel rear wall water-cooled wall 14, an upper sedimentation denitration chamber 19, a lower sedimentation denitration chamber 29, a denitration spray gun 36, a flue gas outlet 30, and a support 9. The combustion system is arranged at the lower part of the front arch of the boiler body, and is composed of a gas (fuel) inlet 8 and a burner 11, and is fixedly connected to the front arch of the boiler body.

[0023] Specifically, in the boiler furnace part, the front arch water-cooled wall 6, the rear arch water-cooled wall 13, the front and rear arch lower headers 12, the front and rear arch upper headers 16, the side water-cooled walls 5, the side water-cooled wall lower headers 10, and the side water-cooled wall upper headers 2 of the boiler body 1 constitute an inclined lower air intake furnace.

[0024] The inclined injection lower air intake method is composed of a front arch water-cooled wall 6 bent to form a gas (fuel) inlet 8 (located at the front part of the lower part 7 of the inclined lower air intake furnace) and a burner 11.

[0025] A sedimentation denitrification spray device is arranged in the space formed by the rear arch water-cooled wall 13 of the boiler body 1 of the boiler furnace part, the channel rear wall water-cooled wall 14 and the side water-cooled wall 5, which consists of a denitrification spray gun 36, a lower sedimentation denitrification chamber 29 and an upper sedimentation denitrification chamber 19.

[0026] The boiler water circulation process is that the boiler return water flows into the upper drum 23 through the water inlet pipe 22, and the boiler outlet water flows out through the water outlet pipe 21. Specifically, the water is connected from the upper drum 23, the front arch downcomer 26, the front side support downcomer 15 (the first throttle ring 4), and the front and rear arch lower headers 12. After heat exchange in the furnaces 3 and 7, it flows into the front and rear arch upper headers 16 and the upper return water pipe 18 back to the upper drum 23, completing the water circulation of the front arch water-cooled wall 6 and the rear arch water-cooled wall 13; the second is from the upper drum 23, the side downcomer 24, the middle support downcomer 20 (Second throttling circle 34), the side water-cooled wall lower header 10 is connected to the water supply, and after heat exchange in the furnaces 3 and 7, it flows into the side water-cooled wall upper header 2 and returns to the upper boiler drum 23, completing the water circulation of the side water-cooled wall 5; thirdly, the upper boiler drum 23, the rear downcomer 25, the rear side support downcomer 27 (third throttling circle 35), and the channel rear wall lower header 32 are connected to the water supply, and after heat exchange with the flue gas, it flows into the channel rear wall upper header 17 and the upper return water pipe 18 and returns to the upper boiler drum 23, completing the water circulation of the channel rear wall water-cooled wall 14; fourthly, the upper boiler drum 23 enters the lower boiler drum 31 through the convection tube bundle 28. Due to the density difference, part of it rises and part of it falls, completing the natural circulation between the upper and lower boiler drums 23, 31 and the convection tube bundle 28.

[0027] The supporting structure is composed of six front side supporting downcomers 15 with supporting and descending functions vertically arranged around the boiler body 1, a first throttle ring 4, an intermediate supporting downcomer 20, a second throttle ring 34, and a rear side supporting downcomer 27 and a third throttle ring 35, an upper boiler drum 23, a lower boiler drum 31, a side water-cooled wall lower header 10, and a side water-cooled wall upper header 2.

[0028] The sedimentation and denitrification spray chamber arranged in the boiler body part includes an upper sedimentation and denitrification chamber 19 and a lower sedimentation and denitrification chamber 29; the upper sedimentation and denitrification chamber is composed of the rear water-cooled wall 13 of the boiler body 1, the channel rear wall water-cooled wall 14 and the side water-cooled wall 5; the lower sedimentation and denitrification chamber is composed of the channel rear wall water-cooled wall 14, the convection tube bundle 28 and the side water-cooled wall 5. Such a structure not only increases the heating area but also plays a role in denitrification and denitrification sedimentation.

[0029] Embodiment 2

[0030] This embodiment is a further improvement made on the basis of the first embodiment, and includes all the technical features of the first embodiment, such as Figure 2 As shown, a superheater is arranged at the upper part of the upper settling denitrification chamber.

[0031] The working process and principle of the present invention are as follows: first, gas and fuel oil are injected into the furnaces 7 and 3 through the gas (fuel oil) inlet 8 via the inclined burner 11 for combustion, and the heat generated is absorbed by the front arch water-cooled wall 6, the rear arch water-cooled wall 13, and the side water-cooled wall 5 of the furnace. The cooled flue gas passes through the upper settling and denitrification chamber 19 downward, enters the lower settling and denitrification chamber 29 upward, and enters the convection tube bundle 28 for flushing and heat exchange, completing the entire heat exchange process. Afterwards, it is discharged from the flue gas outlet 30, completing the boiler flue gas working process.

[0032] Secondly, the boiler water circulation process is that the boiler return water flows into the upper drum 23 through the water inlet pipe 22, and the boiler outlet water flows out through the water outlet pipe 21. Specifically, the water is connected from the upper drum 23, the front arch downcomer 26, the front side support downcomer 15 (the first throttle ring 4), and the front and rear arch lower headers 12. After heat exchange in the furnaces 3 and 7, it flows into the front and rear arch upper headers 16 and the upper return pipe 18 back to the upper drum 23, completing the water circulation of the front arch water-cooled wall 6 and the rear arch water-cooled wall 13; the water is connected from the upper drum 23, the side downcomer 24, the middle support downcomer 20 (the second throttle ring 34), and the side water-cooled wall lower header 10. After heat exchange in the furnaces 3 and 7, it flows into the side water-cooled wall upper header 2 and returns to the upper drum 23, completing The water circulates through the side water-cooled wall 5; the water is supplied by the upper drum 23, the rear downcomer 25, the rear side support downcomer 27 (the third throttling ring 35), and the lower header 32 of the channel rear wall, and flows into the upper header 17 of the channel rear wall and the upper return pipe 18 after the flue gas heat exchange, and returns to the upper drum 23 to complete the water circulation of the channel rear wall water-cooled wall 14; the water enters the lower drum 31 from the upper drum 23 through the convection tube bundle 28. Due to the density difference, part of it rises and part of it falls, completing the natural circulation between the upper and lower drums 23, 31 and the convection tube bundle 28, and completing the whole working process.

[0033] Thirdly, the support of the boiler is composed of six pipes vertically arranged around the boiler body 1 and the lower support 9, which is stable and also serves as a downcomer.

[0034] It is important to explain that ① is the settling denitration spray device and boiler water circulation mechanism of this technology. The former is mainly for spraying denitration and sedimentation. The flue gas at the outlet of the upper furnace 3 and the denitrification agent sprayed by the denitration spray gun 36 are first countercurrent and then downstream to contact and react chemically, completing the flue gas denitration dust settling process, reducing nitrogen oxide emissions, and saving energy and environmental protection. The latter is mainly to add a set of boiler water circulation processes, that is, the water-cooled wall 14 of the rear wall of the channel is formed, which increases the heating area. The flue gas at the furnace outlet does not directly flush the heating surface tube, reducing wear, extending the service life of the boiler, reducing the number of maintenance times, and reducing the cost of use. It is important to explain that ② is the inclined injection lower air intake burner of this technology. The inclined burner injects gas and fuel into the furnace 7, 3, the flame can extend freely, the combustion chamber height is high, the fuel residence time is long, the flame fullness is relatively good, and the fuel can be fully burned. This technology can be a double-drum inclined injection gas and fuel angle tube boiler hot water boiler, steam boiler, pulverized coal boiler, fluidized bed, biomass boiler, or other types of boilers. In addition, this technology can be widely applied to various other corner tube boilers.

[0035] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A double-drum settling denitration chamber jet lower air intake gas and oil-fired angle tube boiler, comprising a boiler furnace part and a combustion system part, wherein the boiler furnace part comprises a boiler body; a supporting structure is arranged in the boiler body, and the supporting structure comprises a front side support downcomer, an intermediate support downcomer and a rear side support downcomer which are vertically arranged; both ends of the front side support downcomer, the intermediate support downcomer and the rear side support downcomer are respectively connected to a horizontally arranged side water-cooled wall upper header and a side water-cooled wall lower header, an upper drum and a lower drum are arranged in the upper right part of the boiler body, the upper drum is connected to a water inlet pipe, a downcomer which is connected to the front side support downcomer, the intermediate support downcomer and the rear support downcomer at the bottom of the upper drum, a front and rear arch lower header is connected to the bottom of the front support downcomer, a front and rear arch upper header which is connected to the front and rear arch lower header is arranged above the boiler body, and the front and rear arch upper headers are connected to the upper drum through an upper return water pipe; The combustion system part includes an inclined lower air intake furnace, which includes a front arch water-cooled wall, a rear arch water-cooled wall, and a side water-cooled wall. The upper ends of the front arch water-cooled wall and the rear arch water-cooled wall are respectively connected to the front and rear arch upper headers, the lower ends of the front arch water-cooled wall and the rear arch water-cooled wall are respectively connected to the front and rear arch lower headers, the upper ends of the side water-cooled walls are respectively connected to the side water-cooled wall upper headers, and the lower ends of the side water-cooled walls are respectively connected to the side water-cooled wall lower headers. An air inlet is bent below the front arch water-cooled wall, and the air inlet is located at the front side of the lower part of the inclined lower air intake furnace. A burner is arranged; a channel rear wall water-cooled wall is arranged on the outer side of the rear arch water-cooled wall, the upper end of the channel rear wall water-cooled wall is connected to the upper header of the channel rear wall water-cooled wall, the lower end of the channel rear wall water-cooled wall is connected to the lower header of the channel rear wall water-cooled wall, the upper header of the channel rear wall water-cooled wall is connected to the upper return pipe and returns to the upper boiler drum, a convection tube bundle is arranged on the outer side of the channel rear wall water-cooled wall, the upper end of the convection tube bundle is connected to the upper boiler drum, the lower end of the convection tube bundle is connected to the lower boiler drum, a flue gas flow opening is opened above the rear arch water-cooled wall, below the channel rear wall water-cooled wall, and above the convection tube bundle, and a flue gas outlet is opened below the convection tube bundle.

2. The double-drum sedimentation denitration chamber spray lower air intake gas and oil-fired angle tube boiler according to claim 1 is characterized in that: The sedimentation and denitrification chamber includes an upper sedimentation and denitrification chamber and a lower sedimentation and denitrification chamber. The upper sedimentation and denitrification chamber is composed of a section surrounded by a rear arch water-cooled wall, a channel rear wall water-cooled wall and a side water-cooled wall; the lower sedimentation and denitrification chamber is composed of a channel rear wall water-cooled wall, a convection tube bundle and a side water-cooled wall.

3. The double-drum sedimentation denitration chamber spray lower air intake gas and oil-fired angle tube boiler according to claim 2 is characterized in that: The denitrification spray gun is arranged in the upper middle part of the upper settling denitrification chamber.

4. The double-drum sedimentation denitration chamber spray bottom intake gas and oil-fired angle tube boiler according to claim 3 is characterized in that: The front support down tube is provided with a first throttle ring, the middle support down tube is provided with a second throttle ring, and the rear support down tube is provided with a third throttle ring.

5. The double-drum sedimentation denitration chamber spray bottom intake gas and oil-fired angle tube boiler according to claim 4 is characterized in that: A symmetrically arranged support is installed at the bottom of the side water-cooled wall lower header.

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