Heat energy recycling device of steam boiler

Abstract

The utility model is suitable for the technical field of heat energy recycling, and provides a heat energy recycling device of a steam boiler, which comprises a flue gas heat energy recycling protective cover, the lower flow guide box is fixed at the bottom of the flue gas heat energy recovery protection cover through a bolt; the upper flow guide box is fixed at the top of the flue gas heat energy recovery protection cover through a bolt; the water inlet electromagnetic valve is embedded and fixed in a position, close to the upper part, of the outer wall of one side of the flue gas heat energy recovery protection cover; the water outlet electromagnetic valve is embedded and fixed in a position close to the lower part of the outer wall of one side of the flue gas heat energy recovery protection cover; according to the principle that the larger the temperature difference is, the higher the cold and heat exchange rate is, water and smoke in the smoke heat energy recovery protection cover are in a large temperature difference at different heights, then the cold and heat exchange rate is increased, and the situation that the temperature is gradually reduced after heat energy in smoke is absorbed by water due to traditional straight-through type smoke flowing is avoided; the subsequent cold and heat exchange rate is low, and the water is heated unevenly.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat energy recovery and utilization, and particularly relates to a heat energy recovery and utilization device for a steam boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes forms such as chemical energy in fuel, electric energy, and heat energy of high-temperature flue gas. After being converted by the boiler, steam, high-temperature water, or organic heat carrier with a certain amount of heat energy is output.

[0003] The flue gas generated by the steam boiler has a large amount of residual heat. Most of the flue gas is directly discharged, and the waste heat of the flue gas is directly discarded in various forms, resulting in low industrial waste utilization rate and insufficient comprehensive utilization of energy.

[0004] Therefore, a heat energy recovery and utilization device for a steam boiler is proposed. Summary of the Utility Model

[0005] The utility model provides a heat energy recovery and utilization device for a steam boiler, aiming to solve the above problems.

[0006] The utility model is realized as follows: A heat energy recovery and utilization device for a steam boiler includes: a flue gas heat energy recovery protection cover; a lower diversion box fixed to the bottom of the flue gas heat energy recovery protection cover by bolts; an upper diversion box fixed to the top of the flue gas heat energy recovery protection cover by bolts; a water inlet solenoid valve embedded and fixed at a position above the outer wall on one side of the flue gas heat energy recovery protection cover; a water outlet solenoid valve embedded and fixed at a position below the outer wall on one side of the flue gas heat energy recovery protection cover; a steam boiler flue gas inlet pipe fixed to the central position at the bottom of the lower diversion box by bolts; a flue gas discharge pipe fixed to the central position at the top of the upper diversion box by bolts; two first metal gas pipes and fourteen second metal gas pipes welded to the top of the lower diversion box. Among them, one first metal gas pipe and seven second metal gas pipes are arranged side by side at equal intervals; heat insulation coatings with gradually increasing heights are sequentially coated on the outer side walls of the seven second metal gas pipes.

[0007] Preferably, one first metal gas pipe and seven second metal gas pipes form a set of water-gas heat and cold exchange components. Two sets of water-gas heat and cold exchange components are horizontally arranged on the top of the lower diversion box, and the heights of the heat insulation coatings on the seven second metal gas pipes in the two sets of water-gas heat and cold exchange components are arranged in a staggered manner.

[0008] Preferably, both the lower diversion box and the upper diversion box are hollow cuboid structures, and the lower diversion box is connected to the steam boiler flue gas inlet pipe, and the upper diversion box is connected to the flue gas discharge pipe.

[0009] Preferably, through holes for precisely inserting the first metal gas guide pipe and the second metal gas guide pipe are formed at the bottom of the upper diversion box, and both the first metal gas guide pipe and the second metal gas guide pipe are communicated with the lower diversion box.

[0010] Preferably, the cross-section of the flue gas heat energy recovery protection cover is a rectangular frame structure, and both the water inlet solenoid valve and the water outlet solenoid valve are communicated with the flue gas heat energy recovery protection cover.

[0011] Preferably, one end of the water outlet solenoid valve is communicated with an external water heat preservation barrel.

[0012] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0013] By using the principle that the greater the temperature difference, the higher the heat and cold exchange rate, the water and flue gas in the flue gas heat energy recovery protection cover are at a large temperature difference at different heights, thereby improving the heat and cold exchange rate, avoiding the problem that the heat in the flue gas is absorbed by the water and then the temperature gradually decreases due to the traditional direct-through flue gas flow, resulting in a low subsequent heat and cold exchange rate and uneven heating of the water. The heat discharged from the steam boiler is fully recovered and comprehensively utilized subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a schematic structural diagram of the first metal gas guide pipe and the second metal gas guide pipe of the present utility model;

[0016] Figure 3 is a schematic structural diagram of the upper diversion box of the present utility model;

[0017] Figure 4 is a top view of the flue gas heat energy recovery protection cover of the present utility model.

[0018] In the figure: 1, flue gas heat energy recovery protection cover; 2, lower diversion box; 3, upper diversion box; 4, water inlet solenoid valve; 5, water outlet solenoid valve; 6, steam boiler flue gas inlet pipe; 7, flue gas discharge pipe; 8, first metal gas guide pipe; 9, second metal gas guide pipe; 10, heat insulation coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] An embodiment of the present utility model provides a heat energy recovery and utilization device for a steam boiler, as Figures 1-4 shown, including a flue gas heat energy recovery protection cover 1. The cross-section of the flue gas heat energy recovery protection cover 1 is a rectangular frame structure. The bottom of the flue gas heat energy recovery protection cover 1 is fixedly connected by bolts to a lower diversion box 2, and the top of the flue gas heat energy recovery protection cover 1 is fixedly connected by bolts to an upper diversion box 3. Both the lower diversion box 2 and the upper diversion box 3 are hollow cuboid structures. At a position above the side outer wall of the flue gas heat energy recovery protection cover 1, a water inlet solenoid valve 4 is fixedly connected by bolts, and at a position below the side outer wall of the other side of the flue gas heat energy recovery protection cover 1, a water outlet solenoid valve 5 is fixedly connected by bolts. Both the water inlet solenoid valve 4 and the water outlet solenoid valve 5 are in communication with the flue gas heat energy recovery protection cover 1. One end of the water outlet solenoid valve 5 is in communication with an external water heat preservation bucket. At the central position of the bottom of the lower diversion box 2, a steam boiler flue gas inlet pipe 6 is fixedly connected by bolts, and the lower diversion box 2 is in communication with the steam boiler flue gas inlet pipe 6. At the central position of the top of the upper diversion box 3, a flue gas discharge pipe 7 is fixedly connected by bolts, and the upper diversion box 3 is in communication with the flue gas discharge pipe 7. Two first metal guide pipes 8 and fourteen second metal guide pipes 9 are welded to the top of the lower diversion box 2. Through holes for the precise insertion of the first metal guide pipes 8 and the second metal guide pipes 9 are provided at the bottom of the upper diversion box 3. Both the first metal guide pipes 8 and the second metal guide pipes 9 are in communication with the lower diversion box 2. One of the first metal guide pipes 8 and seven of the second metal guide pipes 9 are arranged side by side at equal intervals, and heat insulation coatings 10 with gradually increasing heights are sequentially coated on the outer side walls of the seven second metal guide pipes 9.

[0022] It should be noted that since the existing steam boilers generate a large amount of waste heat in the flue gas, most of the flue gas is directly discharged, and the waste heat of the flue gas is directly discarded in various forms, resulting in a low utilization rate of industrial waste heat and insufficient comprehensive utilization of energy. In this embodiment, the principle that the greater the temperature difference, the higher the heat and cold exchange rate is utilized, so that the water and the flue gas in the flue gas heat energy recovery protection cover 1 are under a large temperature difference at different heights, thereby increasing the heat and cold exchange rate, avoiding the problem that the heat energy in the flue gas is absorbed by water and then the temperature gradually decreases due to the traditional direct-through flue gas flow, and further avoiding the problems of low subsequent heat and cold exchange rate and uneven heating of water. The heat discharged from the steam boiler is fully recovered and comprehensively utilized subsequently.

[0023] Specifically, in this embodiment, the solution mainly includes a first metal air duct 8, a second metal air duct 9, and a heat insulation coating 10. When in use, the flue gas discharge port of the steam boiler (not shown in the figure) is connected and fixed to the steam boiler flue gas inlet pipe 6. The flue gas generated by the operation of the steam boiler enters the lower diversion box 2 through the steam boiler flue gas inlet pipe 6. Under the diversion of the lower diversion box 2, the flue gas enters the first metal air duct 8 and the second metal air duct 9 and moves upward. Open the water inlet solenoid valve 4, introduce water into the interior of the flue gas heat energy recovery protection cover 1 through the water inlet solenoid valve 4, and make the interior of the flue gas heat energy recovery protection cover 1 filled with water. Close the water inlet solenoid valve 4. When the flue gas flows inside the first metal air duct 8 and the second metal air duct 9, through the heat conduction of the first metal air duct 8 and the second metal air duct 9, the flue gas exchanges heat and cold with the water, and the heat in the flue gas is absorbed by the water, and the water is heated. After a period of time, open the water outlet solenoid valve 5, and the heated water in the flue gas heat energy recovery protection cover 1 is discharged into the external water heat preservation bucket through the water outlet solenoid valve 5 to complete the heat energy recovery of the flue gas. The flue gas after the heat energy is recovered converges inside the upper diversion box 3 and is finally discharged through the flue gas discharge pipe 7.

[0024] In a further preferred embodiment of the present utility model, as Figure 2 shown, one first metal air duct 8 and seven second metal air ducts 9 form a set of water-gas heat and cold exchange components. Two sets of water-gas heat and cold exchange components are horizontally arranged at the top of the lower diversion box 2, and the heights of the heat insulation coatings 10 on the seven second metal air ducts 9 in the two sets of water-gas heat and cold exchange components are arranged in a staggered manner.

[0025] In this embodiment, by arranging the heights of the heat insulation coatings 10 in a staggered manner, the second metal gas conduit 9 can have a corresponding length of heat transfer length. Through the cooperation of two sets of water-gas heat and cold exchange components, efficient heat and cold exchange between the water in the flue gas heat energy recovery cover 1 and the flue gas in the first metal gas conduit 8 and the second metal gas conduit 9 is realized. The stepped heat transfer can ensure that the water and the flue gas are at a large temperature difference at different heights, thereby increasing the heat and cold exchange rate and avoiding the problems that occur in the traditional direct-through flue gas flow, such as the gradual decrease in temperature after the heat energy in the flue gas is absorbed by the water, resulting in a low subsequent heat and cold exchange rate and uneven heating of the water.

[0026] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0027] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units can be implemented in other ways in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0028] The units described as separate components above may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0029] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without making creative efforts, combine, add or delete the features in the embodiments of the present utility model according to the circumstances or make other adjustments, so as to obtain different technical solutions that essentially do not deviate from the concept of the present utility model, and these technical solutions also fall within the scope of protection of the present utility model.

Claims

1. A heat recovery device for a steam boiler, characterized in that: include: Flue gas heat recovery protection cover (1); A lower guide box (2) fixed to the bottom of the flue gas heat energy recovery protection cover (1) by means of bolts; and An upper guide box (3) fixed to the top of the flue gas heat energy recovery protection cover (1) by means of bolts; a water inlet solenoid valve (4) embedded and fixed at an upper position of an outer wall of one side of the flue gas heat recovery protection cover (1); and A water outlet solenoid valve (5) embedded and fixed at a lower position of an outer wall of one side of the flue gas heat energy recovery protection cover (1); A steam boiler smoke inlet pipe (6) fixed to the central position of the bottom of the lower guide box (2) by bolts; A smoke exhaust pipe (7) fixed to the center of the top of the upper guide box (3) by bolts; Two first metal air guide tubes (8) and fourteen second metal air guide tubes (9) welded to the top of the lower air guide box (2), wherein one first metal air guide tube (8) and seven second metal air guide tubes (9) are arranged side by side and at equal intervals; The outer side walls of the seven second metal air guide tubes (9) are coated in sequence with heat insulation coatings (10) of gradually increasing heights.

2. A heat recovery device for a steam boiler as claimed in claim 1, characterized in that: One of the first metal air guide tubes (8) and seven second metal air guide tubes (9) form a group of water-air heat exchange components; the two groups of water-air heat exchange components are arranged horizontally on the top of the lower guide box (2); and the heights of the heat insulation coatings (10) on the seven second metal air guide tubes (9) in the two groups of water-air heat exchange components are arranged in a staggered manner.

3. The heat energy recovery and utilization device of a steam boiler according to claim 1, characterized in that: The lower guide box (2) and the upper guide box (3) are both hollow rectangular parallelepiped structures, and the lower guide box (2) is connected to the steam boiler smoke inlet pipe (6), and the upper guide box (3) is connected to the smoke outlet pipe (7).

4. The heat energy recovery and utilization device of a steam boiler according to claim 1, characterized in that: The bottom of the upper air guide box (3) is provided with a through hole into which a first metal air guide pipe (8) and a second metal air guide pipe (9) can be precisely inserted, and the first metal air guide pipe (8) and the second metal air guide pipe (9) are both connected to the lower air guide box (2).

5. The heat energy recovery and utilization device of a steam boiler according to claim 1, characterized in that: The cross section of the flue gas heat energy recovery protection cover (1) is a rectangular frame structure, and the water inlet solenoid valve (4) and the water outlet solenoid valve (5) are both connected to the flue gas heat energy recovery protection cover (1).

6. The heat recovery device for a steam boiler according to claim 1, characterized in that: One end of the water outlet solenoid valve (5) is connected to an external water insulation tank.

Images