Flue gas heat exchanger and energy-saving heat supply device

Abstract

The utility model discloses a flue gas heat exchanger and energy-saving heat supply device, the flue gas heat exchanger comprises a device body, a heat exchange tube group and a smoke barrier, the two ends of the device body are respectively provided with a water distribution chamber and a water collection chamber which are communicated with the heat exchange tube group, the heat exchange tube group comprises a first heat exchange tube and a second heat exchange tube, the first heat exchange pipes and the second heat exchange pipes are arranged in a staggered mode to form at least two heat exchange rings, the smoke barrier divides the flue into an air inlet cavity and an air outlet cavity, and the air inlet cavity, the heat exchange gaps and the air outlet cavity communicate with one another to form a smoke circulation channel. According to the flue gas heat exchanger, through the structural combination of the device body, the heat exchange pipe set and the smoke baffle, the heat exchange pipe set is of a straight pipe type structure, after water inflow and heat exchange are conducted through the water distribution chamber, flue gas flows into the water collection chamber and then is output, and under the action of the smoke baffle, flue gas can flow in the heat exchange gaps, so that the heat exchange efficiency is improved, and the overall heat absorption effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a flue gas heat exchanger and an energy-saving heating device. Background Technology

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food, and many other industrial productions. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators, and reboilers, and are widely used.

[0003] A flue gas heat exchanger is a heat exchange device used to exchange heat with flue gas. High-temperature flue gas, especially that produced by gas-fired hot water boilers, exchanges heat with the system water inside the boiler before being discharged into the atmosphere. Since this part of the flue gas still contains heat energy, the industry currently uses energy-saving devices and other equipment for heat recovery. However, most energy-saving devices have U-shaped heat exchange tubes that are spiraled from bottom to top, with the U-shaped bends of the heat exchange tubes exposed to the outside or insulated with insulation materials. This causes some heat to dissipate to the outside, or the U-shaped bends can affect the heat absorption efficiency of the water circuit, thus affecting the overall heat absorption effect. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a flue gas heat exchanger that solves the aforementioned traditional problems.

[0005] The second objective of this utility model is to provide an energy-saving heating device that uses the flue gas heat exchanger.

[0006] One of the objectives of this utility model is achieved through the following technical solution:

[0007] A flue gas heat exchanger includes a main body with a flue, a heat exchange tube assembly installed within the main body, and a baffle plate. The main body has a water distribution chamber and a water collection chamber at both ends, respectively connected to the heat exchange tube assembly. The heat exchange tube assembly includes a first heat exchange tube and a second heat exchange tube, with a heat exchange gap between them. The first and second heat exchange tubes are staggered to form at least two heat exchange rings. The baffle plate is installed within the smallest diameter heat exchange ring and divides the flue into an inlet chamber and an outlet chamber. The inlet chamber, the heat exchange gap, and the outlet chamber are interconnected to form a flue gas flow channel.

[0008] Preferably, the device body is provided with a plurality of arc-shaped grooves, and the heat exchange ring with the largest diameter is accommodated in the arc-shaped grooves.

[0009] Preferably, the device body is provided with a water inlet connecting flange interface and a water outlet connecting flange interface, the water inlet connecting flange interface is communicated with the water distribution chamber, and the water outlet connecting flange interface is communicated with the water collecting chamber.

[0010] Preferably, the device body is further provided with a condensed water discharge interface, and the condensed water discharge interface is communicated with the flue.

[0011] Preferably, the condensed water discharge interface is provided with a U-shaped water seal.

[0012] Preferably, the device body is further provided with a pressure relief interface, and a safety valve is mounted on the pressure relief interface.

[0013] Preferably, the first heat exchange pipe and the second heat exchange pipe are both finned heat exchange pipes.

[0014] Preferably, the diameter of the smoke baffle is equal to the diameter of the air inlet of the device body.

[0015] Preferably, the smoke baffle is located at 1 / 2-2 / 3 of the device body.

[0016] The second purpose of the utility model is achieved by the following technical scheme.

[0017] An energy-saving heat supply device comprises the flue gas heat exchanger.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The flue gas heat exchanger comprises a device body, a heat exchange pipe group and a smoke baffle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a structural schematic view of the flue gas heat exchanger of the utility model;

[0021] Figure 2 Fig. 2 is a sectional view of the flue gas heat exchanger shown in Fig. 1. Figure 1

[0022] In the drawing: 10, device body; 11, water distribution chamber; 12, water collecting chamber; 13, arc-shaped groove; 14, water inlet connecting flange interface; 15, water outlet connecting flange interface; 16, pressure relief interface; 20, heat exchange pipe group. DETAILED DESCRIPTION

[0023] ​In order to make the above objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0025] In the description of the present application, it should be understood that when one element is considered to be "connected" to another element, it can be directly connected to another element or there can be intermediate elements. In contrast, when the element is referred to as "directly" connected to another element, there is no intermediate element.

[0026] Please refer to Figure 1 and Figure 2 , the flue gas heat exchanger of a preferred embodiment of the present application is used for being installed in an energy-saving heating device, especially in the flue gas discharge port of a gas water heater, to recover the waste heat of flue gas. Specifically, the flue gas heat exchanger comprises a device body 10 having a flue, a heat exchange pipe group 20 and a smoke baffle (not shown in the figure) installed in the device body 10, the two ends of the device body 10 are provided with a water distribution chamber 11 and a water collecting chamber 12 which are respectively connected with the heat exchange pipe group 20, the heat exchange pipe group 20 comprises first heat exchange pipes and second heat exchange pipes, the first heat exchange pipes and the second heat exchange pipes have heat exchange gaps therebetween, and the first heat exchange pipes and the second heat exchange pipes are arranged in a staggered manner to form at least two heat exchange rings, the smoke baffle is installed in the heat exchange ring with the smallest diameter, and the smoke baffle divides the flue into an air inlet cavity and an air outlet cavity, the air inlet cavity, the heat exchange gap and the air outlet cavity are connected with each other to form a flue gas flow channel.

[0027] The flue gas heat exchanger described above is combined by the structure of the device body 10, the heat exchange pipe group 20 and the smoke baffle. The heat exchange pipe group 20 is a straight pipe structure, water is supplied through the water distribution chamber 11, after heat exchange, the water flows into the water collecting chamber 12 and is then output. Under the action of the smoke baffle, the flue gas can flow between the heat exchange gaps, so as to increase the heat exchange efficiency and improve the overall heat absorption effect.

[0028] In the embodiment, the body 10 is provided with a plurality of arc-shaped grooves 13, and the heat exchange rings with the largest diameter are accommodated in the arc-shaped grooves 13. The body 10 is provided with a water inlet connecting flange interface 14 and a water outlet connecting flange interface 15. The water inlet connecting flange interface 14 is in communication with the water distribution chamber 11, and the water outlet connecting flange interface 15 is in communication with the water collecting chamber 12.

[0029] In other embodiments, the body 10 is further provided with a condensed water discharge interface (not shown in the figure), which is in communication with the flue for discharging the condensed water from the flue gas. The condensed water discharge interface is provided with a U-shaped water seal to avoid leakage of the flue gas. In the embodiment, the body 10 is further provided with a pressure relief interface 16, and a safety valve (not shown in the figure) is installed on the pressure relief interface 16. When blockage occurs, the safety valve can timely discharge the gas.

[0030] In one of the embodiments, the first heat exchange pipe and the second heat exchange pipe are both finned heat exchange pipes to increase the heat exchange area with the flue gas.

[0031] In the embodiment, the diameter of the smoke baffle is equal to the diameter of the gas inlet of the body 10, so that the flue gas can flow into the heat exchange rings for heat exchange. The smoke baffle is located at 1 / 2-2 / 3 of the body 10, i.e. close to the gas outlet of the body 10, so that the flue gas can exchange heat with the front end heat exchange pipe part of the body 10, and the remaining heat can exchange heat with the rear end heat exchange pipe part, thereby improving the heat exchange efficiency.

[0032] In other embodiments, the utility model further provides an energy-saving heat supply device, which comprises a gas water heater, the flue gas heat exchanger and the waste heat utilization device. The flue gas heat exchanger is installed at the flue gas outlet of the gas water heater, and is connected with the waste heat utilization device. System water is input into the waste heat utilization device for waste heat recovery, and then the system water is input into the gas water heater for further heating to obtain high-temperature hot water or steam.

[0033] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the utility model.

[0034] The above-described embodiments only express several implementation manners of the utility model, and the description is relatively specific and detailed, however, it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the concept of the utility model, a plurality of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A flue gas heat exchanger, characterized in that The application relates to a flue gas heat exchanger, which comprises a device body with a flue, a heat exchange pipe group installed in the device body and a smoke baffle, two ends of the device body are respectively provided with a water distribution chamber and a water collecting chamber which are communicated with the heat exchange pipe group, the heat exchange pipe group comprises first heat exchange pipes and second heat exchange pipes, the first heat exchange pipes and the second heat exchange pipes are arranged in a staggered mode to form at least two heat exchange circles, the smoke baffle is installed in the heat exchange circle with the minimum diameter, the smoke baffle divides the flue into an air inlet cavity and an air outlet cavity, and the air inlet cavity, the heat exchange gap and the air outlet cavity are communicated to form a flue gas flow channel.

2. The flue gas heat exchanger according to claim 1, characterized in that The device body is provided with a plurality of arc-shaped grooves, and the heat exchange circle with the maximum diameter is arranged in the arc-shaped grooves.

3. The flue gas heat exchanger according to claim 1, characterized in that The device body is provided with a water inlet connecting flange interface and a water outlet connecting flange interface, the water inlet connecting flange interface is communicated with the water distribution chamber, and the water outlet connecting flange interface is communicated with the water collecting chamber.

4. The flue gas heat exchanger according to claim 1, characterized in that The device body is further provided with a condensed water discharge interface which is communicated with the flue.

5. The flue gas heat exchanger according to claim 4, characterized in that The condensed water discharge interface is provided with a U-shaped water seal.

6. The flue gas heat exchanger according to claim 4, characterized in that The device body is further provided with a pressure relief interface which is provided with a safety valve.

7. The flue gas heat exchanger of claim 1, wherein, The first heat exchange pipes and the second heat exchange pipes are finned heat exchange pipes.

8. The flue gas heat exchanger of claim 1, wherein, The diameter of the smoke baffle is equal to the diameter of the air inlet of the device body.

9. The flue gas heat exchanger of claim 1, wherein, The smoke baffle is located at 1 / 2-2 / 3 of the device body.

10. An energy saving heating device, characterized by The application further relates to a flue gas heat exchanger comprising the flue gas heat exchanger according to any one of claims 1-9.

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