Flue type natural circulation waste heat boiler

Abstract

A flue type natural circulation waste heat boiler relates to the technical field of boilers and comprises a flue gas inlet, a first heat exchange area, a second heat exchange area, a third heat exchange area, a fourth heat exchange area and a flue gas outlet which are communicated in sequence, the fourth heat exchange area is a vertically arranged smoke exhaust channel, and an energy saver used for inputting an external water source is arranged in the smoke exhaust channel. The third heat exchange area is provided with a water cooling system, the water cooling system comprises an upper steam pocket and a lower steam pocket connected with the upper steam pocket through a plurality of heat exchange pipes, the energy saver is connected with the upper steam pocket, the first heat exchange area is a vertically-arranged smoke inlet channel, water cooling wall pipes are evenly distributed on the inner wall of the smoke inlet channel, and the lower steam pocket is communicated with the bottom ends of the water cooling wall pipes. The top end of the water wall tube is communicated with an upper steam pocket, and the top end of the upper steam pocket is provided with a steam output port. According to the utility model, the effects of high-efficiency preheating utilization, good dust removal effect, reasonable flue gas flow path and more uniform heating of the pipe wall of the water cooling system can be realized; and the boiler can generate sufficient steam and obtain considerable benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a flue type natural circulation waste heat boiler. Background Art

[0002] Waste heat boiler is a boiler that uses the waste heat in waste gas, waste materials or waste liquid in various industrial processes and the heat generated by the combustion of combustible materials to heat water to a certain temperature. Waste heat boiler can produce hot water or steam through waste heat recovery to supply other sections.

[0003] Existing waste heat boilers are prone to uneven heating of various locations on the water cooling system pipe wall during operation. When some metal pipe wall locations are overheated, pipe bursts and other accidents may even occur. In addition, this type of waste heat boiler is a self-contained structure, which requires a lot of labor to dismantle and assemble the boiler pipes when they need maintenance. Utility Model Content

[0004] The utility model aims to provide a flue type natural circulation waste heat boiler to improve the uniformity of heating of the pipe wall of the water cooling system.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a flue-type natural circulation waste heat boiler, comprising a flue gas inlet, a first heat exchange zone, a second heat exchange zone, a third heat exchange zone, a fourth heat exchange zone and a flue gas outlet connected in sequence, the fourth heat exchange zone is a vertically arranged smoke exhaust channel and an economizer for inputting an external water source is arranged in the smoke exhaust channel, the third heat exchange zone is provided with a water cooling system, the water cooling system comprises an upper steam drum and a lower steam drum connected to the upper steam drum through a plurality of heat exchange tubes, the economizer is connected to the upper steam drum for supplying water to the upper steam drum, the first heat exchange zone is a vertically arranged smoke inlet channel and water-cooled wall tubes are evenly distributed on the inner wall of the smoke inlet channel, the lower steam drum is connected to the bottom end of the water-cooled wall tube, the top end of the water-cooled wall tube is connected to the upper steam drum, the top end of the upper steam drum is provided with a steam outlet, the second heat exchange zone is provided with a cyclone dust collector, and the smoke in the first heat exchange zone is separated from the impurities in the airflow by the cyclone dust removal action after entering the cyclone dust collector.

[0006] Preferably, an opening connected to a cyclone dust collector is provided on one side of the upper portion of the first heat exchange zone, and an upper outlet for exhausting flue gas is provided at the upper end of the cyclone dust collector, and a waste outlet for exhausting impurities is provided at the lower end.

[0007] More preferably, the number of the cyclone dust collectors is two.

[0008] More preferably, in the third heat exchange zone, a plurality of guide plates are used to guide the flue gas flow route from top to bottom and then from bottom to top before entering the fourth heat exchange zone.

[0009] More preferably, a plurality of conical ash hoppers are provided at the lower portion of the third heat exchange zone, and a waste opening is provided at the bottom end of the ash hopper.

[0010] More preferably, there are multiple energy savers, and the multiple energy savers are connected and arranged in sequence from bottom to top along the smoke exhaust channel.

[0011] More preferably, the first heat exchange zone, the second heat exchange zone, the third heat exchange zone and the fourth heat exchange zone are all box-type structures and independently provided with support frames, and each box-type structure is provided with a plurality of inspection doors.

[0012] Compared with the prior art, the utility model sets up a first heat exchange zone to exchange heat for the waste heat flue gas, and then separates impurities through a second heat exchange zone, thereby effectively controlling the flue gas temperature, so that the temperature of the flue gas entering the third heat exchange zone and contacting the water cooling system is more uniform, which greatly reduces the risk of bursting of heat exchange tubes in the water cooling system due to uneven heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional view of the overall structure in an embodiment of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0015] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure combination in the BB direction and CC direction;

[0016] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the DD direction.

[0017] In the figure:

[0018] 1——First heat exchange zone 2——Second heat exchange zone 3——Third heat exchange zone

[0019] 4——Fourth heat exchange zone 5——Flue gas inlet 6——Flue gas outlet

[0020] 7——Energy saver 8——Shangqi drum 9——Cyclone dust collector

[0021] 10——lower steam drum 11——water-cooled wall tube 12——steam outlet

[0022] 13——Waste outlet 14——Deflector plate 15——Inspection door

[0023] 16——Heat exchange tube. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0025] It should be noted in advance that, in the present utility model, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In addition, in the present utility model, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can include the first and second features directly contacting, and can also include the first and second features not being in direct contact but contacting through another feature between them.

[0026] like Figures 1 to 4 As shown, the flue-type natural circulation waste heat boiler comprises a flue gas inlet 5, a first heat exchange area 1, a second heat exchange area 2, a third heat exchange area 3, a fourth heat exchange area 4 and a flue gas outlet 6 which are connected in sequence. The fourth heat exchange area 4 is a vertically arranged exhaust channel and an economizer 7 for inputting an external water source is arranged in the exhaust channel. The third heat exchange area 3 is provided with a water cooling system, which comprises an upper steam drum 8 and a lower steam drum 10 connected to the upper steam drum 8 through a plurality of heat exchange tubes 16. The economizer 7 is provided in the exhaust channel. 7 is connected to the upper steam drum 8 for supplying water to the upper steam drum 8. The first heat exchange zone 1 is a vertically arranged smoke inlet channel and the inner wall of the smoke inlet channel is evenly distributed with water-cooled wall tubes 11. The lower steam drum 10 is connected to the bottom end of the water-cooled wall tube 11, and the top end of the water-cooled wall tube 11 is connected to the upper steam drum 8. The top end of the upper steam drum 8 is provided with a steam outlet 12. The second heat exchange zone 2 is provided with a cyclone dust collector 9. After the smoke from the first heat exchange zone 1 enters the cyclone dust collector 9, the impurities in the airflow are separated by the cyclone dust removal effect.

[0027] In the above structure, an opening connected to the cyclone dust collector 9 is opened on one side of the upper part of the first heat exchange zone 1, and the cyclone dust collector 9 is provided with an upper outlet for flue gas discharge at the upper end and a waste port 13 for impurities discharge at the lower end.

[0028] In order to improve the separation effect of impurities in the flue gas, the number of cyclone dust collectors 9 in this embodiment is two.

[0029] Preferably, the third heat exchange zone 3 is provided with a plurality of guide plates 14 to guide the flue gas flow route from top to bottom and then from bottom to top before entering the fourth heat exchange zone 4. A plurality of conical ash hoppers are provided at the lower part of the third heat exchange zone 3, and a waste port 13 is provided at the bottom end of the ash hopper to collect and further discharge dust impurities in the flue gas.

[0030] In addition, in this embodiment, there are multiple energy savers 7, and multiple energy savers 7 are connected and arranged in sequence from bottom to top along the smoke exhaust channel. The first heat exchange area 1, the second heat exchange area 2, the third heat exchange area 3 and the fourth heat exchange area 4 are all box-type structures and independently provided with support frames. Each box-type structure is provided with a plurality of inspection doors 15, and an escalator is also provided on the outside of the box-type structure. The smoke inlet 5 is also provided with a temperature and pressure measuring hole to facilitate real-time monitoring of the inlet smoke temperature and facilitate related control.

[0031] When the flue-type natural circulation waste heat boiler provided in the above-mentioned embodiment is working, the high-temperature waste heat flue gas enters from the flue gas inlet 5, flows vertically upward along the first heat exchange zone 1, and then enters the two cyclone dust collectors 9. The cyclone dust collectors 9 can adopt a conventional existing structure, so that the flue gas enters the cyclone dust collectors 9 in an inclined direction and flows in a spiral manner along the inside of the cyclone dust collectors 9, so that a larger part of the dust impurities (partial solid particles or heavy particles) in the flue gas are separated and fall downward for temporary collection, and the flue gas can be discharged from the upper outlet at the upper end of the cyclone dust collector 9 and enter the third heat exchange zone 3. Then, the flue gas is guided by the guide plate 14, first enters downward into the lower part of the third heat exchange zone 3, and then enters upward into the upper part of the third heat exchange zone 3 and then passes through. It enters the top of the fourth heat exchange zone 4, and then flows downward along the fourth heat exchange zone 4 until it is discharged from the flue gas outlet 6; on the other side, the external water source first enters the economizer 7, exchanges heat with the flue gas in the fourth heat exchange zone 4 to achieve preheating, and then enters the upper steam drum 8, and then flows downward along each heat exchange tube 16 to the lower steam drum 10. In the process of flowing downward, it fully exchanges heat with the flue gas in the third heat exchange zone 3 to further increase the water temperature, and then the hot water in the lower steam drum 10 further flows to the bottom end of the water-cooled wall tube 11. At this time, affected by the higher temperature of the flue gas in the first heat exchange zone 1, the water in the water-cooled tube wall 11 forms a steam form and gradually flows upward until it enters the upper steam drum 8, and finally is sent to the outside through the steam outlet 12 for use.

[0032] The effects of the flue-type natural circulation waste heat boiler provided in this embodiment are as follows:

[0033] 1. High-efficiency utilization of waste heat: The waste heat boiler utilizes high-temperature waste heat flue gas for energy recovery, effectively improving energy utilization efficiency.

[0034] 2. Good dust removal effect: Through two cyclone dust collectors, the larger dust impurities in the flue gas are separated and collected downwards, thus achieving a good dust removal effect, effectively reducing the emission of atmospheric pollutants and improving the ecological environment.

[0035] 3. Reasonable flue gas flow path: The flow path design through the third heat exchange zone and the fourth heat exchange zone allows the flue gas to be fully mixed and contacted while exchanging heat, thereby improving the waste heat transfer effect.

[0036] 4. Preheat water source: Through the economizer and steam drum, the external water source is heat exchanged and preheated to improve the thermal efficiency of the system.

[0037] 5. Each heat exchange area adopts a box-type structure design, which absorbs heat evenly and effectively protects each pressurized component, and is convenient for maintenance and cleaning.

[0038] 6. Adaptable to various working conditions: Due to the adoption of natural circulation, the waste heat boiler has strong adaptability and stability, and can achieve high-efficiency operation under different working conditions.

[0039] This flue-type natural circulation waste heat boiler has many advantages over other types of waste heat boilers. First, the structure is relatively simple, without complex circulation pumps and control systems, and maintenance and use are relatively convenient. Second, no external energy supply is required, and water circulation can be achieved only by natural convection, which is energy-saving and environmentally friendly. Finally, the operation is stable and reliable, and has a long service life.

[0040] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and the above-mentioned embodiments are better implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. Flue-type natural circulation waste heat boiler, characterized by: The invention comprises a smoke inlet (5), a first heat exchange zone (1), a second heat exchange zone (2), a third heat exchange zone (3), a fourth heat exchange zone (4) and a smoke exhaust port (6) which are connected in sequence, wherein the fourth heat exchange zone (4) is a vertically arranged smoke exhaust channel and an economizer (7) for inputting an external water source is arranged in the smoke exhaust channel, the third heat exchange zone (3) is provided with a water cooling system, the water cooling system comprises an upper steam drum (8) and a lower steam drum (10) connected to the upper steam drum (8) via a plurality of heat exchange tubes (16), the economizer (7) is connected to the upper steam drum (8) to The first heat exchange zone (1) is a vertically arranged smoke inlet channel and the inner wall of the smoke inlet channel is evenly distributed with water-cooled wall tubes (11). The lower steam drum (10) is connected to the bottom end of the water-cooled wall tube (11), and the top end of the water-cooled wall tube (11) is connected to the upper steam drum (8). The top end of the upper steam drum (8) is provided with a steam outlet (12). The second heat exchange zone (2) is provided with a cyclone dust collector (9). After the smoke from the first heat exchange zone (1) enters the cyclone dust collector (9), impurities in the airflow are separated by cyclone dust removal.

2. The flue-type natural circulation waste heat boiler according to claim 1 is characterized in that: An opening connected to a cyclone dust collector (9) is provided on one side of the upper portion of the first heat exchange zone (1); an upper outlet for exhausting flue gas is provided at the upper end of the cyclone dust collector (9); and a waste outlet (13) for exhausting impurities is provided at the lower end of the cyclone dust collector (9).

3. The flue-type natural circulation waste heat boiler according to claim 2 is characterized in that: The number of the cyclone dust collectors (9) is two.

4. The flue-type natural circulation waste heat boiler according to claim 1 is characterized in that: In the third heat exchange zone (3), a plurality of guide plates (14) are used to guide the flue gas flow route from top to bottom and then from bottom to top before entering the fourth heat exchange zone (4).

5. The flue-type natural circulation waste heat boiler according to claim 4 is characterized in that: A plurality of conical ash hoppers are provided at the lower part of the third heat exchange zone (3), and a waste material opening (13) is provided at the bottom end of each ash hopper.

6. The flue-type natural circulation waste heat boiler according to claim 1, characterized in that: The number of the energy savers (7) is plural, and the multiple energy savers (7) are arranged in sequence and connected from bottom to top along the smoke exhaust channel.

7. The flue-type natural circulation waste heat boiler according to any one of claims 1 to 6, characterized in that: The first heat exchange zone (1), the second heat exchange zone (2), the third heat exchange zone (3) and the fourth heat exchange zone (4) are all box-type structures and are independently provided with support frames, and each box-type structure is provided with a plurality of inspection doors (15).

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