A single-drum settling denitration chamber with downward-inlet gas and oil-fired corner tube boiler

Abstract

The present invention discloses a single-drum settling denitration chamber injection downward air intake gas-fired and oil-fired corner tube boiler, which includes a boiler furnace body part and a combustion system part. A support structure is arranged inside the boiler body, and the support structure includes a front side downcomer, an intermediate downcomer, and a rear side downcomer that are vertically arranged; both ends of the front side downcomer, the intermediate downcomer, and the rear side downcomer are respectively connected to a side water wall upper header and a side water wall lower header that are horizontally arranged. The bottom of the drum is connected to a downcomer that communicates with the intermediate downcomer and the rear side downcomer. The bottom of the intermediate downcomer is connected to a front and rear arch lower header. An upper front and rear arch header that communicates with the front and rear arch lower header is arranged above the boiler body. The front and rear arch upper header and the drum are connected through an upper return water pipe. The present invention has a long fuel residence time, the flame can freely extend, the fuel can be fully burned, the support structure is stable, and the water circulation is safe.

Description

Technical Field

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

[0002] As is well known, current gas-fired and oil-fired boilers generally have side inlets. The front-to-back distance of the combustion chamber is short, the height of the combustion chamber is low, the volume of the combustion chamber is small, there is no settling chamber, and the support structure and water circulation are not safe. This structure results in a short residence time of the flue gas, which needs to turn and enter the upper part of the furnace. The flame cannot stretch freely, the gas combustion is uneven, the fuel combustion is insufficient, the degree of filling of the flue gas in the combustion chamber is not high, the nitrogen oxide emission concentration is high, the flue gas directly scours the rear wall of the furnace, causing serious wear, the dust cannot settle, the heating surface area is small, the service life is low, the maintenance rate is high, and the use cost is increased. With the increasingly strict national environmental protection policies, boilers with this well-known structure cannot meet the emission requirements of the national boiler air pollution emission standards, with high nitrogen oxide concentration and environmental pollution. Therefore, how to solve the problems of the boiler without a settling chamber and dust settling, short residence time of the flue gas, inability of the flame to stretch freely, uneven gas combustion, insufficient fuel combustion, low degree of filling of the combustion chamber, direct scouring of the rear wall of the furnace by the flue gas, reduction of wear, as well as solving the problems of small heating surface area, unstable support structure, unsafe water circulation, extension of the boiler service life, reduction of the maintenance times, reduction of the use cost, and in addition, reduction of nitrogen oxide emissions, has become an urgent problem to be solved at present. Summary of the Invention

[0003] The object of the present invention is to provide a single-drum settling denitration chamber jet downward-inlet gas-fired and oil-fired corner tube boiler with a settling denitration chamber and an inclined jet downward-inlet combustion chamber to solve the problems existing in the above-mentioned prior art, so that the fuel residence time is long, the flame can stretch freely, the fuel can be fully burned, the nitrogen oxide emissions are reduced, the support 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 single-drum settling denitration chamber injection downward air intake gas-fired and oil-fired corner tube boiler, including a boiler furnace body part and a combustion system part. A support structure is arranged inside the boiler body, and the support structure includes a front side downcomer, an intermediate downcomer, and a rear side downcomer that are vertically arranged; both ends of the front side downcomer, the intermediate downcomer, and the rear side downcomer are respectively connected to a side water wall upper header and a side water wall lower header that are horizontally arranged. 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 intermediate downcomer and the rear side downcomer is connected to the bottom of the drum, the bottom of the intermediate downcomer is connected to a front and rear arch lower header, a front and rear arch upper header communicated with the front and rear arch lower header is arranged above the boiler body, and the front and rear arch upper header and the drum are communicated through an upper return water pipe.

[0006] Optionally, the combustion system includes an inclined downward air intake furnace, and the inclined downward air intake furnace includes a front arch water wall, a rear arch water wall, and side water walls. The upper ends of the front arch water wall and the rear arch water wall are respectively connected to the front and rear arch upper headers, the lower ends of the front arch water wall and the rear arch water wall are respectively connected to the front and rear arch lower headers, the upper end of the side water wall is connected to the side water wall upper header, the lower end of the side water wall is connected to the side water wall lower header, an air intake port is bent and arranged below the front arch water wall, and a burner is arranged at the air intake port; a channel rear wall water wall is arranged outside the rear arch water wall, the upper end of the channel rear wall water wall is connected to a channel rear wall water wall upper header, the lower end of the channel rear wall water wall is connected to a channel rear wall water wall lower header, the channel rear wall upper header is communicated with the upper return water pipe and returns to the drum, a flag-type heating surface tube is arranged outside the channel rear wall water wall, the top of the flag-type heating surface tube is connected to a water outlet header through a flag-type heating surface upper header, the bottom of the flag-type heating surface tube is connected to a flag-type heating surface lower header, and the flag-type heating surface lower header is located below the rear side downcomer; a flue gas circulation port is arranged above the rear arch water wall and below the channel rear wall water wall, and a flue gas outlet is arranged above the flag-type heating surface tube.

[0007] Optionally, a settling denitration chamber is arranged between the channel rear wall water wall and the rear arch water wall, a denitration spray gun is arranged in the upper middle part of the settling denitration chamber, the flue gas circulation port is located above the rear arch water wall and below the channel rear wall water wall, and the flue gas outlet is located above the flag-type heating surface.

[0008] Optionally, a flag-type heating surface is arranged between the flag-type heating surface tube and the channel rear wall water wall, and the flue gas outlet is located above the flag-type heating surface.

[0009] Optionally, the bottom of the drum is communicated with the upper part of the front downcomer, the bottom of the front downcomer is communicated with the lower header of the side water-cooled wall, the lower header of the side water-cooled wall is communicated with the upper header of the side water-cooled wall, and the upper header of the side water-cooled wall is communicated with the drum.

[0010] Optionally, a water supply pipe is communicated with the drum, the bottom of the water supply pipe is communicated with the lower header of the flag-type heating surface, the lower header of the flag-type heating surface is communicated with the upper header of the flag-type heating surface through the flag-type heating surface pipes, and the upper header of the flag-type heating surface is communicated with the outlet header.

[0011] Optionally, a first throttle ring is arranged on the intermediate downcomer, and a second throttle ring is arranged on the rear downcomer.

[0012] Optionally, both ends of the rear downcomer are respectively communicated with the upper header and the lower header of the side water-cooled wall.

[0013] Optionally, symmetrically arranged supports are installed at the bottom of the lower header of the side water-cooled wall.

[0014] The present invention has achieved the following technical effects compared with the prior art:

[0015] The single-drum sedimentation denitration chamber jet downward intake gas-fired and oil-fired corner tube boiler provided by the present invention, a structure with an inclined jet downward intake combustion chamber and a sedimentation denitration spray chamber designed in the boiler body part, has a large heating area, a long fuel residence time, the flame can freely extend, the fuel can be fully burned, the dust can naturally settle, the support structure and water circulation are safe, the emission of nitrogen oxides is reduced, the boiler thermal efficiency is improved, and the structure is simple. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is the main view of the structure of Embodiment 1 of the single-drum sedimentation denitration chamber jet downward intake gas-fired and oil-fired corner tube boiler of the present invention.

[0018] Figure 2 It is the main view of the structure of Embodiment 2 of the single-drum sedimentation denitration chamber jet downward intake gas-fired and oil-fired corner tube boiler of the present invention.

[0019] Figure 3 It is the main view of the structure of Embodiment 3 of the single-drum sedimentation denitration chamber jet downward intake gas-fired and oil-fired corner tube boiler of the present invention.

[0020] Figure 4 This is the front view of the structure of the fourth embodiment of the single-drum settling denitration chamber injection downward air intake gas and oil fired corner tube boiler of the present invention.

[0021] In the figure: 1 boiler body, 2 water inlet pipe, 3 upper drum, 4 first downcomer, 5 second downcomer, 6 front side downcomer, 7 upper part of the furnace, 8 side water wall, 9 front arch water wall, 10 inclined downward air intake lower part of the furnace, 11 gas and oil inlet, 12 support, 13 burner, 14 side water wall lower header, 15 water supply pipe, 16 upper return water pipe, 17 intermediate downcomer, 18 front and rear arch upper headers, 19 channel rear wall upper header, 20 outlet header, 21 flag type heating surface upper header, 22 side water wall upper header, 23 flue gas outlet, 24 second throttle ring, 25 flag type heating surface, 26 rear side downcomer, 27 rear arch water wall, 28 lower settling denitration chamber, 29 front and rear arch lower headers, 30 flag type heating surface tubes, 31 channel rear wall water wall, 32 flag type heating surface lower header, 33 channel rear wall lower header, 34 first throttle ring, 35 upper settling denitration chamber, 36 denitration spray gun. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The purpose of the present invention is to provide a single-drum settling denitration chamber injection downward air intake gas and oil fired corner tube boiler with a settling denitration chamber and an inclined downward injection air intake combustion chamber, so as to solve the problems existing in the above-mentioned prior art, make the fuel residence time long, the flame can freely extend, the fuel can be fully burned, reduce the emission of nitrogen oxides, and the support structure is stable and the water circulation is safe.

[0024] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0025] Embodiment 1

[0026] The present invention provides a single-drum settling denitration chamber injection downward air intake gas and oil fired corner tube boiler, as Figure 1As shown in the figure, it includes the boiler furnace body part and the combustion system part. The boiler furnace body part includes the boiler body 1, six front side downcomers 6, intermediate downcomers 17, the first throttle ring 34, and rear side downcomers 26 with support and downward functions vertically arranged around the boiler body 1, the second throttle ring 24, the steam drum 3 arranged in the upper left part of the boiler body 1, the water inlet pipe 2, the feed water pipe 15, the first downcomer 4, the second downcomer 5, and the upper return water pipe 16, the side water wall 8, the upper part of the furnace 7, the inclined lower intake furnace lower part 10, the front arch water wall 9, the front and rear arch lower headers 29, the side water wall lower headers 14, the side water wall upper headers 22, the front and rear arch upper headers 18, the water outlet header 20, the channel rear wall lower header 33, the channel rear wall upper header 19, the flag type heating surface upper header 21, the flag type heating surface pipes 30, the flue gas outlet 23, the flag type heating surface 25, the rear arch water wall 27, the channel rear wall water wall 31, the flag type heating surface lower header 32, the lower sedimentation denitration chamber 28, the upper sedimentation denitration chamber 35, the denitration spray gun 36, and the support 12. The combustion system part is arranged at the lower part of the front arch of the boiler body and is composed of a gas (oil) inlet 11 and a burner 13, which is fixedly connected to the front arch of the boiler body.

[0027] Specifically, the front arch water wall 9, the rear arch water wall 27, the front and rear arch lower headers 29, the front and rear arch upper headers 18, the side water wall 8, the side water wall lower headers 14, and the side water wall upper headers 22 of the boiler body 1 in the boiler furnace body part form an inclined lower intake furnace.

[0028] It is composed of an inclined injection lower intake method, and is composed of the gas (oil) inlet 11 (located on the front side of the lower part of the inclined lower intake furnace 10) formed by bending the front arch water wall 9 and the burner 13.

[0029] A sedimentation denitration spraying device is arranged in the space formed by the rear arch water wall 27, the channel rear wall water wall 31, and the side water wall 8 of the boiler body 1 in the boiler furnace body part, which is composed of the denitration spray gun 36, the lower sedimentation denitration chamber 28, and the upper sedimentation denitration chamber 35.

[0030] The boiler water circulation process is that the boiler return water flows into the drum 3 through the inlet pipe 2, and the boiler outlet water flows out through the outlet header 20. Specifically, one is that the drum 3, the first downcomer 4, the intermediate downcomer 17 (the first throttle ring 34), and the front and rear arch lower headers 29 are connected to supply water. After heat exchange in the furnace 10 and 7, it flows into the front and rear arch upper headers 18 and the upper return pipe 16 and returns to the drum 3 to complete the water circulation of the front arch water wall 9 and the rear arch water wall 27. The second is that the drum 3, the front side downcomer 6, the rear side downcomer 26 (the second throttle ring 24), and the side water wall lower header 14 are connected to supply water. After heat exchange in the furnace 10 and 7, it flows into the side water wall upper header 22, and the upper return pipe 16 returns to the drum 3 to complete the water circulation of the side water wall 8. The third is that the drum 3, the second downcomer 5, the rear side downcomer 26 (the second throttle ring 24), and the channel rear wall lower header 33 are connected to supply water. After heat exchange with flue gas, it flows into the channel rear wall upper header 19, and the upper return pipe 16 returns to the drum 3 to complete the water circulation of the channel rear wall water wall 31. The fourth is that the drum 3 and the feed pipe 15 are connected to supply water, enter the flag-type heating surface lower header 32, the flag-type heating surface pipe 30, the flag-type heating surface 25, and the flag-type heating surface upper header 21 to complete the water circulation of the flag-type heating surface 25, and the water flows out through the outlet header 20.

[0031] The support structure consists of six front side downcomers 6, intermediate downcomers 17, the first throttle ring 34, and rear side downcomers 26 with both support and downcomer functions vertically arranged around the boiler body 1, and the drum 3, the side water wall lower header 14, and the side water wall upper header 22 arranged in the upper left part of the boiler body 1.

[0032] Embodiment 2

[0033] This embodiment is a further improvement based on Embodiment 1 and includes all the technical features of Embodiment 1, such as Figure 2 As shown, a steam outlet is added to the drum 3, replacing the outlet header 20, and the feed pipe 15 in the body becomes a gas collecting pipe 15.

[0034] Embodiment 3

[0035] This embodiment is a further improvement based on Embodiment 1 and includes all the technical features of Embodiment 1, such as Figure 3 As shown, the drum 3 is in the upper right part of the boiler body 1.

[0036] Embodiment 4

[0037] This embodiment is a further improvement based on Embodiment 1 and includes all the technical features of Embodiment 1, such as Figure 4 As shown, the drum 3 is in the upper right part of the boiler body 1. A steam outlet is added to the drum, replacing the outlet header 20, and the feed and return pipe 15 in the body becomes a gas collecting pipe 15.

[0038] The working process and principle of the present invention are as follows: First, gas fuel is injected into the furnace 10, 7 through the inclined burner 13 via the gas (fuel) inlet 11 for combustion. The heat generated is absorbed by the front arch water-cooled wall 9, the rear arch water-cooled wall 27, and the side water-cooled wall 8 of the furnace. The flue gas after temperature reduction passes through the upper sedimentation denitration chamber 35 and the lower sedimentation denitration chamber 28, rises, and enters the flag-type heating surface 25 for scouring heat exchange to complete the entire heat exchange process. Then, it is discharged from the flue gas outlet 23 to complete the working process of the boiler flue gas.

[0039] Second, the boiler water circulation process is that the boiler return water flows into the drum 3 through the water inlet pipe 2, and the boiler outlet water flows out through the outlet header 20. Specifically, one is that the drum 3, the first downcomer 4, the intermediate downcomer 17 (the first throttle ring 34), and the front and rear arch lower headers 29 are connected to supply water. After heat exchange in the furnace 10, 7, it flows into the front and rear arch upper headers 18 and the upper return water pipe 16 and returns to the drum 3 to complete the water circulation of the front arch water-cooled wall 9 and the rear arch water-cooled wall 27. Second, the drum 3, the front side downcomer 6, the rear side downcomer 26 (the second throttle ring 24), and the side water-cooled wall lower header 14 are connected to supply water. After heat exchange in the furnace 10, 7, it flows into the side water-cooled wall upper header 22, and the upper return water pipe 16 returns to the drum 3 to complete the water circulation of the side water-cooled wall 8. Third, the drum 3, the second downcomer 5, the rear side downcomer 26 (the second throttle ring 24), and the channel rear wall lower header 33 are connected to supply water. After heat exchange with the flue gas, it flows into the channel rear wall upper header 19 and the upper return water pipe 16 and returns to the drum 3 to complete the water circulation of the channel rear wall water-cooled wall 31. Fourth, the drum 3 and the water supply pipe 15 are connected to supply water, enter the flag-type heating surface lower header 32, the flag-type heating surface pipe 30, the flag-type heating surface 25, and the flag-type heating surface upper header 21 to complete the water circulation of the flag-type heating surface 25. The water flows out through the outlet header 20 to complete the entire working process.

[0040] Specifically, the boiler is supported by six pipes vertically arranged around the boiler body 1 and the lower support 12, which is stable in support and also serves as a downcomer.

[0041] It should be emphasized that ① the sedimentation denitration spray device and the boiler water circulation mechanism of the present technology. The former mainly conducts spray denitration and sedimentation. The flue gas at the outlet of the upper furnace 7 contacts the denitration agent sprayed by the denitration spray gun 36 first in a countercurrent manner and then in a co-current manner, and then a chemical reaction occurs to complete the process of flue gas denitration and dust sedimentation, reducing nitrogen oxide emissions, saving energy and protecting the environment. The latter mainly adds a set of boiler water circulation processes, that is, the water-cooled wall 31 on the rear wall of the channel, increasing the heat absorption area. The flue gas at the furnace outlet does not directly scour the flag-type heating surface serpentine tube, reducing wear, extending the service life of the boiler, reducing the number of repairs, and reducing the use cost. It should be emphasized that ② the inclined injection lower air intake burner of the present technology. The inclined burner injects gas and fuel into the furnaces 10 and 7. The flame can stretch freely, the combustion chamber has a high height, the fuel residence time is long, the flame filling degree is relatively good, and the fuel can be fully burned. The present technology can be an inclined injection gas-fired, oil-fired corner tube boiler, hot water boiler, steam boiler, pulverized coal boiler, fluidized bed, biomass boiler, or other types of boilers. In addition, the present technology can be widely applied to other various corner tube boilers.

[0042] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A single-drum settling denitration chamber injection downward air intake gas-fired and oil-fired corner tube boiler, Characterized in that: It includes a boiler furnace body part, and the boiler furnace body part includes a boiler body and a combustion system part; a support structure is arranged inside the boiler body, and the support structure includes a front side downcomer, a middle downcomer, and a rear side downcomer that are vertically arranged; both ends of the front side downcomer, the middle downcomer, and the rear side downcomer are respectively connected with a side water wall upper header and a side water wall lower header that are horizontally arranged. Above one side of the boiler body, there is a drum, and a water inlet pipe is connected to the drum. The bottom of the drum is connected with a downcomer that communicates with the middle downcomer and the rear side downcomer. The bottom of the middle downcomer is connected with a front and rear arch lower header. Above the inside of the boiler body, there is a front and rear arch upper header that communicates with the front and rear arch lower header. The front and rear arch upper header and the drum are communicated through an upper return water pipe; The combustion system part includes an inclined downward air intake furnace. The inclined downward air intake furnace is composed of a front arch water wall, a rear arch water wall, a front and rear arch lower header, a front and rear arch upper header, side water walls, side water wall lower headers, and side water wall upper headers. The upper ends of the front arch water wall and the rear arch water wall are respectively connected with the front and rear arch upper headers. The lower ends of the front arch water wall and the rear arch water wall are respectively connected with the front and rear arch lower headers. The upper end of the side water wall is connected with the side water wall upper header. The lower end of the side water wall is connected with the side water wall lower header. An air inlet is bent and arranged below the front arch water wall, and a burner is arranged at the air inlet; A channel rear wall water wall is arranged outside the rear arch water wall. The upper end of the channel rear wall water wall is connected with a channel rear wall upper header. The lower end of the channel rear wall water wall is connected with a channel rear wall lower header. The channel rear wall upper header is communicated with the upper return water pipe and returns to the drum. A flag-type heating surface tube is arranged outside the channel rear wall water wall. The top of the flag-type heating surface tube is connected with a water outlet header through a flag-type heating surface upper header. The bottom of the flag-type heating surface tube is connected with a flag-type heating surface lower header. The flag-type heating surface lower header is located below the rear side downcomer; A flue gas circulation port is arranged above the rear arch water wall and below the channel rear wall water wall. A flue gas outlet is opened above the flag-type heating surface tube; A settling denitration spraying device is arranged in the space formed by the rear arch water wall, the channel rear wall water wall, and the side water wall. The settling denitration spraying device is composed of a denitration spray gun, a lower settling denitration chamber, and an upper settling denitration chamber; A first throttle ring is arranged on the middle downcomer, and a second throttle ring is arranged on the rear side downcomer.

2. The single-drum settling denitration chamber injection downward air intake gas-fired and oil-fired corner tube boiler according to claim 1, Characterized in that: The bottom of the drum is communicated with the upper part of the front side downcomer. The bottom of the front side downcomer is communicated with the side water wall lower header. The side water wall lower header is communicated with the side water wall upper header. The side water wall upper header is communicated with the drum.

3. The single-drum settling denitration chamber injection downward air intake gas-fired and oil-fired corner tube boiler according to claim 2, Characterized in that: The steam drum is connected with a water supply pipe, the bottom of the water supply pipe is connected with the lower header of the flag-type heating surface, the lower header of the flag-type heating surface is connected with the upper header of the flag-type heating surface through the flag-type heating surface tubes, and the upper header of the flag-type heating surface is connected with the water outlet header.

4. The single-steam-drum sedimentation denitration chamber injection lower-inlet gas-fired and oil-fired corner tube boiler according to claim 3, characterized in that: Symmetrically arranged supports are installed at the bottom of the lower header of the side water-cooled wall.

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