CN110454773B - Energy-saving flue gas waste heat recovery pipeline - Google Patents

Abstract

The invention discloses an energy-saving flue gas waste heat recovery pipe, which relates to the technical field of waste heat recovery devices. The telescopic pipe of the invention is arranged in a folded shape, and the hot gas is retained in the telescopic pipe through the barrier of a non-return plate, so that the heat energy can be more fully recovered. At the same time, while the gas in the telescopic tube is continuously expanding, the air pressure is converted into the mechanical energy of the telescopic tube standing up, and the telescopic tube is continuously pumping in fresh water while it is standing upright, this process until the telescopic tube drives the check plate to contact the top block , so that the air pressure inside and outside the telescopic tube is connected, and at the same time, the telescopic tube is continuously contracted under the action of its own gravity, thereby driving the liquid in it to continuously discharge from the water outlet until the telescopic tube moves to the lowest point, realizing a cycle through which the expansion and contraction are realized. The self-lifting of the pipe and the self-suction of the liquid in the cavity do not require additional energy to drive, and at the same time maximize the utilization of the thermal energy of the flue gas, saving energy and environmental protection.

Description

An energy-saving flue gas waste heat recovery pipeline

technical field

The invention relates to the technical field of waste heat recovery devices, in particular to an energy-saving flue gas waste heat recovery pipeline.

Background technique

A boiler is an energy converter, which is a device that uses the heat energy or other heat energy released by the combustion of fuel to heat working water or other fluids to a certain temperature. There are many reasons that affect the fuel consumption of the heating furnace in the operation of the boiler, and the heat loss of the exhaust gas is one of the most important factors. The heat exchanger uses the heat energy of the flue gas for secondary use, but because the flue gas is quickly discharged after heating, the heat is discharged into the atmosphere before it is fully utilized.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose an energy-saving flue gas waste heat recovery pipeline in order to solve the above problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

Including a fixing frame, the fixing frame is provided with at least one rod body, the rod body is provided with a non-return plate sliding along its radial direction within its length, the bottom end of the non-return plate is connected with a telescopic tube, and the stop is The return plate closes one side of the telescopic tube;

A top block is installed on the top of the fixing frame, and when the non-return plate is in contact with the top block, the non-return plate is opened;

The tube wall of the telescopic tube adopts a double-layer structure, and the telescopic tube is formed by nesting two parts of an outer wall and an inner wall, and both ends of the outer wall and the inner wall are closed and a closed cavity is formed between them;

A water outlet pipe and a water inlet pipe are arranged on the telescopic pipe, and both the water outlet pipe and the water inlet pipe are connected with the cavity, the water inlet pipe is installed with a first check valve, and the water outlet pipe is installed with a second check valve .

Optionally, the outer surface of the rod body is provided with an external thread, a nut is rotatably connected to the connection between the fixing frame and the rod body, and the rod body is threadedly connected with the nut through the external thread.

Optionally, the port of the rod body is fixedly connected with a limit slider, a chute is provided on the fixing frame at a position corresponding to the limit slider, and the limit slider is slidably connected in the chute.

Optionally, through holes corresponding to the number and position of the rod body are defined on the non-return plate, the rod body passes through the through hole, and the inner diameter of the through hole is 2-5 m larger than the outer diameter of the rod body.

Optionally, at least one annular indentation is provided on the outer wall and the inner wall equidistantly along the axial direction of the telescopic tube.

Optionally, the annular indentation is at an angle of 10°-170°.

Optionally, a ring of annular protrusions is provided on the body of the annular indentation.

Optionally, the inner wall is made of a thermally conductive metal material, and the outer wall is made of a metal heat-insulating composite material.

Optionally, the non-return plate includes a plate body, a tension spring and a baffle plate, at least one opening is formed on the non-return plate, and a baffle plate having the same shape as the opening and a size larger than the opening is hinged on one side of the opening. , the other side of the opening is provided with a tension spring connecting the plate body and the baffle, and the top block corresponds to the number of openings.

Compared with the prior art, the present invention has the following advantages:

The telescopic tube of the invention is arranged in a folded shape, and the hot gas is retained in the telescopic tube through the barrier of the check plate, so that the thermal energy can be more fully utilized, and at the same time, the gas in the telescopic tube is continuously expanded, and the air pressure is converted into the mechanical energy of the telescopic tube standing upright. , while the telescopic tube is standing upright, it continuously draws in fresh water. In this process, the telescopic tube drives the check plate to contact the top block, so that the air pressure inside and outside the telescopic tube is connected. At the same time, the telescopic tube shrinks under the action of its own gravity. In this way, the liquid in it is continuously discharged from the water outlet pipe until the telescopic pipe moves to the lowest position, and a cycle is realized. Through this cycle, the self-lifting of the telescopic pipe and the self-suction of the liquid in the cavity are realized without additional energy driving. The thermal energy of the gas is maximized, energy saving and environmental protection.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the sectional view of the telescopic tube of the present invention;

FIG. 3 is an enlarged structural schematic diagram of part A in FIG. 2 of the present invention.

In the figure: 1 fixed frame, 2 telescopic tube, 2a outer wall, 2b inner wall, 2c annular indentation, 2d annular protrusion, 3 water inlet pipe, 4 first check valve, 5 water outlet pipe, 6 second check valve, 7 Limit slider, 8 check plate, 81 plate body, 82 tension spring, 83 baffle plate, 9 chute, 10 rod body, 11 nut, 12 top block.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, but not all of the embodiments.

Example 1

1 to 5 , a fixing frame 1 is included, and two rod bodies 10 are arranged on the fixing frame 1 , and in this embodiment, the two rod bodies 10 are symmetrically arranged on the fixing frame 1 , and the rod bodies 10 are arranged on the fixing frame 1 . There is a non-return plate 8 that slides radially along its length.

3, the specific structure of the non-return plate 8 is as follows:

The non-return plate 8 includes a plate body 81, a tension spring 82 and a baffle plate 83. An opening is provided on the non-return plate 8, and a baffle plate having the same shape as the opening and a size larger than the opening is hinged on one side of the opening. 83. The other side of the opening is provided with a tension spring 82 connecting the plate body 81 and the baffle 83. The top block 12 corresponds to the number of openings, each of which is one. Under normal conditions, the tension spring 82 pulls the baffle 83 to move The opening is closed, and when the baffle 83 is in contact with the top block 12, a gap appears between the baffle 83 and the opening.

In this embodiment, through holes corresponding to the number and position of the rod bodies 10 are formed on the non-return plate 8, the number of through holes is two, the rod body 10 passes through the through holes, and the inner diameter of the through holes is larger than that of the rod body The outer diameter of 10 is 2-5 cm, so that the non-return plate 8 can be slidably connected to the rod body 10 through the through hole.

The bottom end of the non-return plate 8 is connected with the telescopic tube 2 , and the non-return plate 8 closes one side of the telescopic tube 2 .

A top block 12 is installed on the top of the fixing frame 1 . When the non-return plate 8 is in contact with the top block 12 , the non-return plate 8 is opened.

The tube wall of the telescopic tube 2 adopts a double-layer structure, and a cavity is provided between the tube walls on both sides of the telescopic tube 2. Referring to FIG. 2, the details are as follows:

The telescopic tube 2 is formed by nesting two parts of the outer wall 2a and the inner wall 2b. Both ends of the outer wall 2a and the inner wall 2b are closed and a closed cavity is formed between them. The cavity can be filled with the liquid to be heated or gaseous medium.

Further, at least one annular indentation 2c is provided on the outer wall 2a and the inner wall 2b at an equal distance along the axial direction of the telescopic tube 2. The function of the annular indentation 2c is to enable the outer wall 2a and the inner wall 2b to follow the annular indentation 2c. By folding, the axial linear distance of the telescopic tube can be reduced during the folding process, and correspondingly, the surface area of the telescopic tube 2 in the original height can be increased, so that the contact with the heat source is more sufficient.

Preferably, the annular indentation 2c is at an angle of 10°-170°, and two sides of the angle can be folded along the annular indentation 2c within a range of 10°-170°.

In a preferred embodiment of the present invention, the inner wall 2b is made of a thermally conductive metal material, which can be made of copper or aluminum, and has a certain bending resistance. Since the inner wall 2b is in direct contact with the heat source, the thermally conductive metal material can be Better transfer heat to the medium in the cavity; the outer wall 2a is made of metal heat-insulating composite materials, for example, the inner layer can be made of solid metal materials such as copper and aluminum, and the outer layer can be made of asbestos, foamed plastics and other heat-insulating materials, The inner and outer layers constitute a metal thermal insulation composite material, which has the mechanical strength of the distance and the thermal insulation performance.

The telescopic pipe 2 is provided with a water outlet pipe 5 and a water inlet pipe 3, and both the water outlet pipe 5 and the water inlet pipe 3 are connected with the cavity. The water inlet pipe 3 is provided with a first check valve 4, and the water outlet pipe 5 A second check valve 6 is installed thereon, and the flow directions of the first check valve 4 and the second check valve 6 are shown in FIG. 2 or the reference numerals in FIG. 4 , which will not be repeated here.

The end of the telescopic tube 2 away from the non-return plate 8 is connected with the outlet pipe of the boiler through a pipe connection such as a flange, the water inlet pipe 3 is connected with the external water source, and the water outlet pipe 5 is connected with the external water supply pipe.

Under normal conditions, the telescopic tube 2 is folded along the annular indentation 3 to shrink under the action of its own gravity, and the space of the cavity is greatly compressed. For space filling, due to the barrier of the non-return plate 8 on the other side of the telescopic tube 2, the gas cannot be discharged, so it can only flow back into the boiler or continuously accumulate in the telescopic tube 2, thereby effectively prolonging the residence time of the gas, and at the same time With the increase of gas, the telescopic tube 2 is continuously erected from a shrinking shape. During the erection process, the space in the cavity is continuously increased, and negative pressure is generated in it, and the liquid is continuously fed from the water inlet pipe 3 under the action of the external atmospheric pressure. Therefore, the filling of the water source in the cavity is realized, and at the same time, due to the arrangement of the first check valve 4 , the liquid cannot flow back into the water inlet pipe 3 .

The inner wall 2b is made of thermally conductive metal material, which can quickly transfer heat to the water source and heat it. The heating time can be changed by adjusting the diameter and length of the telescopic tube 2. The heating continues until the telescopic tube 2 drives the check plate 8 to move to the top. At block 12, under the pressure of the top block 12, the baffle 83 overcomes the pressure of the gas in the telescopic tube 2 and the tension of the tension spring 82, so that the baffle 83 opens the gap, and the air pressure inside and outside the telescopic tube 2 is constantly balanced through the gap, At the same time, the telescopic tube 2 continuously shrinks under the action of its own gravity. During the shrinking process, the pressure in the cavity is greater than the external atmospheric pressure, thereby driving the liquid in it to be continuously discharged from the water outlet pipe 5 until the telescopic tube 2 moves to the lowest position. a cycle.

In the early stage of the movement of the telescopic tube 2, due to its low linear height, the folded structure can increase the contact area between the telescopic tube 2 and the flue gas at the lower height, so that whether the telescopic tube 2 is folded or upright, the contact area between the telescopic tube 2 and the flue gas can be increased. The contact area is not much different, resulting in better heating.

Embodiment 2

Embodiment 2 On the basis of Embodiment 1, further:

The annular indentation 2c is provided with a ring of annular protrusions 2d on the entity. The arrangement of the annular protrusions 2d increases the length of the annular indentation 2c on the one hand, making it more smooth and the force-bearing area is larger, It avoids the problem that the traditional corner structure is easily damaged when the force is concentrated at one point. Thermal expansion and cold contraction are used for length compensation to avoid breakage.

Embodiment 3

Embodiment 3 On the basis of Embodiment 1 or Embodiment 2, further:

The outer surface of the rod body 10 is provided with an external thread, a nut 11 is rotatably connected to the connection part of the fixing frame 1 with the rod body 10, and the rod body 10 is threadedly connected with the nut 11 through the external thread, and the fixed connection of the port of the rod body 10 is limited. Position slider 7, a chute 9 is provided on the fixing frame 1 at the position corresponding to the limit slider 7, and the limit slider 7 is slidably connected in the chute 9, and rotating the nut 11 can drive the rod body 10 up and down in the axial direction displacement, thereby further driving the slider 7 to slide on the chute 9 . When the slider 7 moves, the minimum movement range of the non-return plate 8 on the rod body 10 can be reduced or increased, thereby increasing or reducing the minimum telescopic range of the telescopic tube 2, and finally realizing the minimum retention of smoke in the telescopic tube 2 each time. Adjustment of the time, and adjustment of the interval between each cavity suction liquid.

Embodiment 4

In this embodiment, the water inlet pipe 3 is communicated with the outside air, and the water outlet pipe 5 is communicated with the combustion chamber of the boiler. The heated flue gas can be sent into the combustion chamber of the boiler to form a mixture with dyes for combustion, which can greatly save the consumption of fuel and energy. .

Although the above disclosure shows illustrative embodiments of the present invention, it should be noted that various changes and modifications may be made therein without departing from the scope of the invention as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the embodiments of the invention described herein do not have to be performed in any particular order. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.

Claims (9)

1. The utility model provides an energy-saving flue gas waste heat recovery pipeline, includes mount (1), its characterized in that: the fixing frame (1) is provided with at least one rod body (10), the rod body (10) is provided with a check plate (8) which slides along the radial direction of the rod body in the length direction of the rod body, the bottom end of the check plate (8) is connected with a telescopic pipe (2), and one side of the telescopic pipe (2) is sealed by the check plate (8);

the top end of the fixed frame (1) is provided with a top block (12), and when the check plate (8) is contacted with the top block (12), the check plate (8) is opened;

the pipe wall of the telescopic pipe (2) adopts a double-layer structure, the telescopic pipe (2) is formed by nesting an outer wall (2a) and an inner wall (2b), two ends of the outer wall (2a) and the inner wall (2b) are closed, and a closed cavity is formed between the two ends;

be provided with outlet pipe (5) and inlet tube (3) on flexible pipe (2), and outlet pipe (5) and inlet tube (3) all communicate with the cavity, install first check valve (4) on inlet tube (3), install second check valve (6) on outlet pipe (5).

2. The energy-saving flue gas waste heat recovery pipeline according to claim 1, wherein an external thread is arranged on the outer surface of the rod body (10), a nut (11) is rotatably connected to the joint of the fixing frame (1) and the rod body (10), and the rod body (10) is in threaded connection with the nut (11) through the external thread.

3. The energy-saving flue gas waste heat recovery pipeline according to claim 2, wherein a limiting slide block (7) is fixedly connected to a port of the rod body (10), a sliding groove (9) is formed in a position, corresponding to the limiting slide block (7), on the fixing frame (1), and the limiting slide block (7) is slidably connected in the sliding groove (9).

4. The energy-saving flue gas waste heat recovery pipeline according to claim 1, wherein through holes corresponding to the number and positions of the rod bodies (10) are formed in the check plate (8), the rod bodies (10) penetrate through the through holes, and the inner diameter of each through hole is 2-5cm larger than the outer diameter of each rod body (10).

5. The energy-saving flue gas waste heat recovery pipeline according to claim 1, wherein the inner wall (2b) is made of heat-conducting metal, and the outer wall (2a) is made of metal heat-insulating composite material.

6. The energy-saving flue gas waste heat recovery pipeline according to claim 1, wherein the outer wall (2a) and the inner wall (2b) are provided with at least one annular indentation (2c) at equal distance along the axial direction of the telescopic pipe (2).

7. The energy-saving flue gas waste heat recovery pipeline according to claim 6, wherein the annular indentation (2c) has an angle of 10-170 °.

8. The energy-saving flue gas waste heat recovery pipeline according to claim 6, wherein a ring of annular protrusions (2d) are arranged on the entity of the annular indentation (2 c).

9. The energy-saving flue gas waste heat recovery pipeline according to claim 1, wherein the check plate (8) comprises a plate body (81), tension springs (82) and baffles (83), at least one opening is formed in the check plate (8), the baffles (83) which are the same in shape as the opening and larger than the opening in size are hinged to one side of the opening, the tension springs (82) connecting the plate body (81) and the baffles (83) are arranged on the other side of the opening, and the number of the top blocks (12) corresponds to the number of the openings.

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