Smoke path and water path double-return-stroke counterflow stepped heat exchange energy-saving multipurpose boiler

Abstract

The invention discloses a smoke path and water path double-return-stroke countercurrent stepped heat exchange energy-saving multipurpose boiler which comprises a water outlet tank arranged in a box body and connected with a water outlet; the water return tank is arranged in the box body and connected with a water return port, and the water return tank is arranged below the water outlet tank; one end of the vertical plate is connected with the water return tank, and a smoke inlet is formed between the vertical plate and the water outlet tank; the tank body is divided into a combustion chamber and a smoke chamber by the water outlet tank, the vertical plate and the water return tank; the plurality of vertical pipes are communicated between the water outlet tank and the water return tank, and the vertical pipes are arranged on one side of the combustion chamber; the bent pipes are communicated between the water outlet tank and the water return tank, and the bent pipes are arranged on one side of the flue gas chamber; by means of the countercurrent mode of smoke and liquid in the bent pipe, liquid flowing can be accelerated, and the smoke flowing speed can be effectively reduced; the accelerated flowing of the liquid improves the heat exchange efficiency, and the slow-down flowing speed of the flue gas prolongs the heat exchange time, so that the heat exchange efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, in particular to a multi-purpose boiler with double-return flue gas and water circuits, countercurrent stepped heat exchange and energy saving. Background Art

[0002] A boiler is a device that converts chemical energy into heat energy. It uses various fuels such as coal, oil or gas to generate steam or hot water by burning to produce heat. However, the thermal efficiency of many current boiler systems is not high. Especially during high-load and low-load operations, their heat exchange efficiency is limited. There are usually energy losses in the heat exchange process inside the boiler. For example, high-temperature flue gas is directly discharged from the high-temperature hot water at the highest point to the environment, making the exhaust gas temperature higher than the hot water temperature. This leads to waste of energy and fails to maximize the utilization of heat.

[0003] Although modern boiler technology has made some progress in improving flue gas emissions, there are still many boilers with too high flue gas emission temperatures. This not only causes waste of thermal energy but also may pollute the environment. The direct discharge of high-temperature flue gas also increases the energy consumption during the operation of the boiler, resulting in low overall energy efficiency of the boiler. In some boiler systems, the flow directions of both flue gas and water vapor are moving upward in the same direction, which is a co-current or parallel flow. This means that the heat exchange between the liquid and the flue gas is not maximally optimized. Since the heat transfer decreases gradually with the increase of the flow distance as the flow directions of the flue gas and water are the same, the heat exchange efficiency is low, and some thermal energy fails to be effectively utilized. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a design with double-return flue gas and water circuits, and combines countercurrent stepped heat exchange. By using the heat exchange between high-temperature flue gas and high-temperature hot water and the heat exchange between low-temperature flue gas and low-temperature water, the heat exchange process is carried out in a hierarchical and stepped manner, maximizing the heat exchange efficiency, while reducing the flue gas emission temperature and effectively reducing the heat waste in the flue gas.

[0005] The purpose of the present invention is achieved in the following way: A multi-purpose boiler tower with double-return flue gas and water circuits, countercurrent stepped heat exchange and energy saving, includes: A box body, inside which various components are provided; An outlet water tank, arranged at the top inside the box body, and it is connected with a water outlet; A return water tank, arranged at the bottom inside the box body, and it is connected with a water return port. The return water tank is arranged below the outlet water tank; A vertical plate, one end of which is connected to the return water tank, and the other end extends to one side below the outlet water tank. An inlet flue gas port is formed between the vertical plate and the outlet water tank; One side of the outlet water tank away from the vertical plate is hermetically connected to the inner wall of the box body; The lower side of the return water tank is hermetically connected to the inner wall of the lower side of the box body; The water outlet tank, the vertical plate, and the return water tank divide the box body into a combustion chamber and a flue gas chamber, and the combustion chamber is connected to the burner; A number of risers are connected between the water outlet tank and the return water tank, and the risers are arranged on one side of the combustion chamber; A number of elbow pipes are connected between the water outlet tank and the return water tank, and the a number of elbow pipes are arranged on one side of the flue gas chamber; A smoke outlet is arranged on the lower side of the combustion chamber.

[0006] In the present invention, the water outlet tank, the vertical plate, and the return water tank divide the box body into a combustion chamber and a flue gas chamber. The combustion chamber is connected to the burner. A number of risers are connected between the water outlet tank and the return water tank, and the risers are arranged on one side of the combustion chamber. The burner heats the water in the water outlet tank, the return water tank, and the risers to form water vapor. The water vapor rises and accumulates in the water outlet tank and is transported to the place where heat is needed through the water outlet. The water in the elbow pipes exchanges heat with the flue gas, and the water vapor in the elbow pipes is also transported through the water outlet.

[0007] As an alternative embodiment of the technical solution of the present invention, a number of the risers are connected to the water outlet tank through a bent portion, and the bent portion is not horizontal and is in the shape of an upward angle with an inner fold angle greater than 90°.

[0008] As an alternative embodiment of the technical solution of the present invention, the flue gas chamber is provided with a flue gas guiding plate, and the flue gas guiding plate includes: A flue gas upper guiding plate is arranged above a number of the elbow pipes and connects the water outlet tank and the side wall of the box body; A flue gas lower guiding plate is arranged below a number of the elbow pipes, and one end of the flue gas lower guiding plate is connected to one side of the return water tank.

[0009] As an alternative embodiment of the technical solution of the present invention, the flue gas guiding plate further includes: A number of flue gas middle guiding plates are arranged between the flue gas upper guiding plate and the flue gas lower guiding plate; The flue gas upper guiding plate, a number of flue gas middle guiding plates, and the flue gas lower guiding plate are arranged above each straight section of the elbow pipes; One end of adjacent flue gas middle guiding plates is alternately connected to the vertical plate and the side wall of the flue gas chamber; A passage for the elbow pipe bend section to pass through is provided between adjacent flue gas middle guiding plates.

[0010] In the present invention, by arranging the flue gas guiding plate to guide the flow direction of the flue gas, a countercurrent is formed between the flue gas and the flow of the liquid in the elbow pipes, so that the liquid in the elbow pipes achieves the effect of self-lifting force accelerating climbing, and the purpose of reducing the emission speed of the flue gas and increasing the heat exchange time is achieved.

[0011] As an alternative embodiment of the technical solution of the present invention, the upper flue gas guiding plate, the plurality of middle flue gas guiding plates, and the lower flue gas guiding plate are arranged parallel to the straight line segment corresponding to the elbow pipe.

[0012] As an alternative embodiment of the technical solution of the present invention, the straight line segment of the elbow pipe is inclined.

[0013] As an alternative embodiment of the technical solution of the present invention, a certain gap is provided between adjacent riser pipes and between adjacent elbow pipes.

[0014] The beneficial effects of the present invention are as follows: (1) In the dual-return, countercurrent stepped heat exchange and energy-saving multi-purpose boiler tower of the flue gas and water circuit of the present invention, through the countercurrent mode of the flue gas and the liquid in the elbow pipe, it can not only accelerate the liquid flow but also effectively slow down the downward flow velocity of the flue gas; the accelerated liquid flow improves the heat exchange efficiency, while the slowdown of the flue gas flow velocity extends the heat exchange time, which helps to further improve the heat exchange efficiency; (2) The present invention utilizes the heat exchange between high-temperature flue gas and high-temperature hot water and the heat exchange between low-temperature flue gas and low-temperature water, so that the heat exchange process is carried out in layers, further optimizing the heat exchange efficiency and at the same time reducing the emission temperature of the flue gas. This stepped design effectively reduces the heat waste in the flue gas; (3) The boiler tower of the present invention can discharge flue gas at a lower temperature and improve the heat exchange efficiency through the countercurrent mode, thereby achieving the effect of energy conservation and emission reduction. The lower flue gas emission temperature reduces the impact on the environment and meets the requirements of modern energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for 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, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the dual-return, countercurrent stepped heat exchange and energy-saving multi-purpose boiler of the flue gas and water circuit of the present invention; Figure 2 It is a schematic structural diagram of the dual-return, countercurrent stepped heat exchange and energy-saving multi-purpose boiler of the flue gas and water circuit of the present invention after removing part of the box body; Figure 3 It is a front view of the dual-return, countercurrent stepped heat exchange and energy-saving multi-purpose boiler of the flue gas and water circuit of the present invention after removing part of the box body; Figure 4 It is a schematic principle diagram of the dual-return, countercurrent stepped heat exchange and energy-saving multi-purpose boiler of the flue gas and water circuit of the present invention.

[0017] Reference Numerals: 100 - Box body; 200 - Water outlet tank; 210 - Water outlet 300 - Return water tank; 310 - Return water inlet 400 - Vertical plate; 500 - Flue gas chamber; 510 - Flue gas inlet; 520 - Flue gas outlet 600 - Combustion chamber; 700 - Burner; 810 - Vertical pipe; 820 - Elbow pipe; 900 - Flue gas guide plate; 910 - Upper flue gas guide plate; 920 - Middle flue gas guide plate; 930 - Lower flue gas guide plate Detailed Embodiments

[0018] 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.

[0019] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0020] In the description of the embodiments, unless otherwise clearly specified and limited, terms such as "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or connected through an intermediate medium, and it can also be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] Such as Figures 1-3As shown in the figure, a smoke and water dual-return, counter-current stepped heat exchange energy-saving multi-purpose boiler tower includes: a box body 100, a water outlet tank 200, a water return tank 300, and a vertical plate 400. Among them, various components are arranged inside the box body 100; the water outlet tank 200 is arranged at the top inside the box body 100, and the water outlet tank 200 is connected with a water outlet 210; the water return tank 300 is arranged at the bottom inside the box body 100, the water return tank 300 is connected with a water return port 310, and the water return tank 300 is arranged below the water outlet tank 200; one end of the vertical plate 400 is connected to the upper end of the water return tank 300, and the other end extends to one side below the water outlet tank 200. The vertical plate 400 is not connected to the water outlet tank 200, and an inlet smoke port 510 is formed between the top of the vertical plate 400 and the water outlet tank 200; the side of the water outlet tank 200 away from the vertical plate 400 is hermetically connected to the inner wall of the box body 100; the lower side of the water return tank 300 is hermetically connected to the inner wall of the lower side of the box body 100.

[0022] As Figure 3 As shown in the figure, the water outlet tank 200, the vertical plate 400, and the water return tank 300 divide the box body 100 into a combustion chamber 600 and a flue gas chamber 500. The combustion chamber 600 is connected to a burner 700. A number of risers 810 communicate between the water outlet tank 200 and the water return tank 300. The risers 810 are arranged on one side of the combustion chamber 600 and are close to the vertical plate 400. A number of risers (810) communicate with the water outlet tank (200) through an upward bending part. The bending part is not horizontal and is in the shape of an elevation angle with an inner fold angle greater than 90°, which is convenient for water vapor to enter the water outlet tank 200; the flame released by the burner 700 heats the water in the water outlet tank 200, the water return tank 300, and a number of risers 810, and the flue gas generated by the burner 700 burning fuel enters the flue gas chamber 500 from the inlet smoke port 510.

[0023] A number of elbow pipes 820 communicate between the water outlet tank 200 and the water return tank 300. A number of elbow pipes 820 are arranged on one side of the flue gas chamber 500; there is a certain gap between adjacent risers 810 and between adjacent elbow pipes 820 to facilitate the passage of flue gas. An outlet smoke port 520 is arranged on the lower side of the combustion chamber 600.

[0024] In this embodiment, the water outlet tank 200, the vertical plate 400, and the water return tank 300 divide the box body 100 into a combustion chamber 600 and a flue gas chamber 500. The combustion chamber 600 is connected to a burner 700. A number of risers 810 communicate between the water outlet tank 200 and the water return tank 300. The risers 810 are arranged on one side of the combustion chamber 600. The burner 700 heats the water in the water outlet tank 200, the water return tank 300, and the risers 810 to form water vapor. The water vapor rises and gathers in the water outlet tank 200 and is transported through the water outlet 210 to the place where heat is needed. The water in the elbow pipes 820 exchanges heat with the flue gas, and the water vapor in the elbow pipes is also transported through the water outlet 210.

[0025] As a further solution of the embodiment, the flue gas chamber 500 is provided with a flue gas guiding plate 900, and the flue gas guiding plate 900 includes an upper flue gas guiding plate 910 and a lower flue gas guiding plate 930. Among them: The upper flue gas guiding plate 910 is arranged above a plurality of elbows 820, connecting the water outlet tank 200 and the side wall of the box body 100; enabling the flue gas to enter the flue gas chamber 500 from below the upper flue gas guiding plate 910; The lower flue gas guiding plate 930 is arranged below a plurality of elbows 820, and one end is connected to one side of the return water tank 300, enabling the flue gas to contact the elbows located between the upper flue gas guiding plate 910 and the lower flue gas guiding plate 930.

[0026] In addition, as Figures 3-4 shown, in order to guide the flow direction of the flue gas, the flue gas guiding plate 900 further includes a plurality of middle flue gas guiding plates 920, and the plurality of middle flue gas guiding plates 920 are arranged between the upper flue gas guiding plate 910 and the lower flue gas guiding plate 930; The upper flue gas guiding plate 910, the plurality of middle flue gas guiding plates 920 and the lower flue gas guiding plate 930 are arranged above the straight segments of the elbows 820, and the upper flue gas guiding plate 910, the plurality of middle flue gas guiding plates 920 and the lower flue gas guiding plate 930 are arranged in parallel with the corresponding straight segments of the elbows 820, enabling the flue gas to fully contact the elbows; As Figures 3-4 shown, the straight segments of the elbows 820 are inclined instead of horizontal, facilitating the climbing of water vapor. One end of adjacent middle flue gas guiding plates 920 is alternately connected to the vertical plate 400 and the side wall of the flue gas chamber 500; A passage for the curved section of the elbow 820 to pass through is provided between adjacent middle flue gas guiding plates 920.

[0027] By setting the flue gas guiding plate 900 to guide the flow direction of the flue gas, at the same time, the flow of the flue gas forms a countercurrent with the liquid flow in the elbows, enabling the liquid in the elbows to achieve the effect of self-lifting force accelerating climbing, and achieving the purpose of reducing the flue gas emission speed and increasing the heat exchange time.

[0028] The smoke path, water path double return, countercurrent stepped heat exchange energy-saving multi-purpose boiler tower of the present invention realizes the upward flow of the liquid in the pipe and the countercurrent of the flue gas, achieving the effect of self-lifting force accelerating climbing. The downward flow of the flue gas is countercurrent to the liquid in the pipe, achieving the purpose of reducing the emission speed and increasing the heat exchange time. This structure not only realizes the accelerated flow of the liquid in the pipe and the decelerated discharge of the flue gas outside the pipe, but also realizes the stepped heat exchange of the high-temperature flue gas exchanging heat with the high-temperature hot water at the highest point and the low-temperature flue gas exchanging heat with the low-temperature hot water at the lowest point, achieving a lower flue gas emission temperature and the purpose of energy conservation and emission reduction.

[0029] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement; when the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A smoke path, water path double return, countercurrent stepped heat exchange energy-saving multi-purpose boiler tower, characterized in that, Comprising: A box body (100) with various components provided therein; A water outlet tank (200) provided at the inner top of the box body (100), which is connected with a water outlet (210); A water return tank (300) provided at the inner bottom of the box body (100), which is connected with a water return port (310), and the water return tank (300) is provided below the water outlet tank (200); A vertical plate (400) with one end connected to the water return tank (300) and the other end extending to one side below the water outlet tank (200), and an air inlet (510) is formed between the vertical plate (400) and the water outlet tank (200); One side of the water outlet tank (200) away from the vertical plate (400) is sealingly connected to the inner wall of the box body (100); The lower side of the water return tank (300) is sealingly connected to the inner wall of the lower side of the box body (100); The water outlet tank (200), the vertical plate (400), and the water return tank (300) divide the box body (100) into a combustion chamber (600) and a flue gas chamber (500), and the combustion chamber (600) is connected to a burner (700); A plurality of risers (810) communicating between the water outlet tank (200) and the water return tank (300), and the risers (810) are provided on one side of the combustion chamber (600); A plurality of elbows (820) communicating between the water outlet tank (200) and the water return tank (300), and the plurality of elbows (820) are provided on one side of the flue gas chamber (500); A smoke outlet (520) provided on the lower side of the combustion chamber (600).

2. The multi-purpose boiler tower with double return of flue gas and water circuits, countercurrent stepped heat exchange and energy saving according to claim 1, characterized in that, A plurality of the risers (810) communicate with the water outlet tank (200) through a bent portion, and the bent portion is not horizontal and is in the shape of an upward angle with an inner fold angle greater than 90°; 3. The multi-purpose boiler tower with double return of smoke path and water path, countercurrent stepped heat exchange and energy saving according to claim 1, characterized in that, The flue gas chamber (500) is provided with a flue gas guiding plate (900), and the flue gas guiding plate (900) includes: A flue gas upper guiding plate (910) provided above the plurality of elbows (820) and connecting the water outlet tank (200) and the side wall of the box body (100); A flue gas lower guiding plate (930) provided below the plurality of elbows (820) and having one end connected to one side of the water return tank (300).

4. The smoke path, water path double-return, countercurrent stepped heat exchange energy-saving multi-purpose boiler tower according to claim 3, characterized in that, The flue gas guiding plate (900) further includes: A plurality of flue gas middle guiding plates (920) provided between the flue gas upper guiding plate (910) and the flue gas lower guiding plate (930); The flue gas upper guiding plate (910), the plurality of flue gas middle guiding plates (920), and the flue gas lower guiding plate (930) are provided above each straight section of the elbow (820); One end of adjacent flue gas middle guiding plates (920) is alternately connected to the vertical plate (400) and the side wall of the flue gas chamber (500); A passage for the bent section of the elbow (820) to pass through is provided between adjacent flue gas middle guiding plates (920).

5. The multi-purpose boiler tower with double return of flue gas and water circuits, countercurrent stepped heat exchange and energy saving as claimed in claim 4, characterized in that, The flue gas upper guiding plate (910), the plurality of flue gas middle guiding plates (920), and the flue gas lower guiding plate (930) are arranged in parallel with the corresponding straight sections of the elbow (820).

6. The multi-purpose boiler tower with double-return smoke and water paths, counter-current stepped heat exchange and energy conservation according to claim 5, characterized in that The straight section of the elbow (820) is inclined.

7. The multi-purpose boiler tower with double return of smoke and water paths, countercurrent stepped heat exchange and energy saving according to claim 1, characterized in that A certain gap is provided between adjacent risers (810) and between adjacent elbows (820).

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