CN211926544U - Boiler flue gas recovery device - Google Patents

Abstract

The utility model discloses a boiler flue gas recovery device, which comprises a tube box, a first communication box and a second communication box. The tube box is provided with a flue gas inlet, a flue gas outlet, a heat exchange medium inlet and a heat exchange medium outlet. A heat exchange tube is arranged in the box, a heat exchange medium flow channel is formed inside the heat exchange tube, and a flue gas flow channel is formed outside the heat exchange tube. The channel includes a first heat exchange medium flow channel, a second heat exchange medium flow channel and a third heat exchange medium flow channel, the heat exchange medium inlet is connected with the first heat exchange medium flow channel, and the first heat exchange medium flow channel passes through the first heat exchange medium flow channel. The communication box is connected with the second heat exchange medium flow channel, the third heat exchange medium flow channel is connected with the second heat exchange medium flow channel through the second communication box, and the heat exchange medium outlet is connected with the third heat exchange medium flow channel connect. The device can effectively improve the recovery efficiency of flue gas and the heat exchange efficiency of the boiler.

Description

Boiler flue gas recovery device

technical field

The utility model relates to the technical field of boilers, in particular to a boiler flue gas recovery device.

Background technique

The current gas-fired industrial boilers generally use a single-flow water supply preheating type flue gas recovery device for the tail flue gas recovery. After some steam-using equipment is used, the steam condensed water can be recycled. Since the temperature of the condensed water is generally around 100 °C, a single-channel water supply preheating type flue gas recovery device is used, and the contact time between the flue gas and the heat exchange medium is short. The temperature difference between the flue gas and the medium is small, the flue gas recovery efficiency is poor, the exhaust gas temperature is about 130 ℃, the flue gas does not meet the requirements of condensation, and the heat exchange efficiency of the gas boiler is low.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a boiler flue gas recovery device that can improve the flue gas recovery efficiency and the boiler heat exchange efficiency.

The purpose of this utility model adopts following technical scheme to realize:

The boiler flue gas recovery device includes a tube box, a first communication box and a second communication box, the tube box is provided with a flue gas inlet, a smoke outlet, a heat exchange medium inlet and a heat exchange medium outlet, and the tube box is provided with There is a heat exchange tube, the heat exchange medium flow channel is formed inside the heat exchange tube, and the flue gas flow channel is formed outside the heat exchange tube, and the flue gas flow channel is respectively connected with the flue gas inlet and the flue gas outlet. The heat exchange medium flow channel includes a first heat exchange medium flow channel, a second heat exchange medium flow channel and a third heat exchange medium flow channel, and the heat exchange medium inlet is connected to the first heat exchange medium flow channel, so The first heat exchange medium flow channel is connected with the second heat exchange medium flow channel through the first communication box, and the third heat exchange medium flow channel is connected with the second heat exchange medium flow channel through the second communication box , the heat exchange medium outlet is connected with the third heat exchange medium flow channel.

Further, the heat exchange tube is a spiral fin structure.

Further, the heat exchange medium is cold air.

Further, the flue gas inlet and the flue gas outlet are respectively arranged on both sides of the pipe box in the vertical direction.

Further, the flue gas inlet is arranged at the top of the tube box, and the smoke outlet is arranged at the bottom of the tube box.

Further, the heat exchange medium inlet and the heat exchange medium outlet are respectively arranged on both sides in the lateral direction of the tube box.

Further, the heat exchange medium inlet is arranged on one side of the bottom of the tube box, and the heat exchange medium outlet is arranged on the other side of the top of the tube box.

Compared with the prior art, the beneficial effects of the present utility model are:

During heat exchange, the heat exchange medium enters the first heat exchange medium flow passage from the heat exchange medium inlet, and the flue gas enters the tube box from the flue gas inlet and passes through the flue gas flow passage. Once heat exchange, after heat exchange, it enters the second heat exchange medium flow channel through the first communication box. At this time, the heat exchange medium and high-temperature flue gas conduct a second heat exchange, and after heat exchange, it enters the second heat exchange medium through the second communication box. In the three heat exchange medium flow channels, the heat exchange medium and the high-temperature flue gas conduct the third heat exchange at this time, and the heat exchange medium after the third heat exchange comes out from the heat exchange medium outlet, wherein the heat exchange medium outlet can be connected with the heat exchange equipment. connected, the flue gas after heat exchange is discharged through the flue gas outlet. The boiler flue gas recovery device can increase the contact time between the flue gas and the heat exchange medium by setting up three heat exchange medium flow passages, which is beneficial to reduce the boiler exhaust gas temperature, so that the high temperature flue gas can meet the requirements of condensation, and improve the boiler exchange rate. Thermal efficiency and flue gas recovery efficiency.

Description of drawings

1 is a schematic diagram of a boiler flue gas recovery device provided by the utility model;

FIG. 2 is a cross-sectional view of the boiler flue gas recovery device provided by the utility model.

In the figure: 1, the tube box; 2, the heat exchange tube; 3, the flue gas inlet; 4, the flue gas outlet; 5, the heat exchange medium inlet; 6, the heat exchange medium outlet; 7, the first communication box; Two Unicom boxes.

Detailed ways

Hereinafter, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new implementations. example.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top" The orientation or positional relationship indicated by , "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or element. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "one," "another," etc. are used to distinguish similar elements and these and other similar terms are not intended to limit the scope of the present invention.

In the description of the present utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, a fixed connection or a detachable connection may be used. , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the internal communication between the 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. In the various figures, identical or corresponding elements are provided with corresponding reference numerals (eg, elements identified with "1XX" and "2XX" have the same structure and similar function).

As shown in Figures 1 and 2, the boiler flue gas recovery device provided by the utility model includes a tube box 1, a first communication box 7 and a second communication box 8, and the tube box 1 is provided with a flue gas inlet 3, The flue gas outlet 4, the heat exchange medium inlet 5 and the heat exchange medium outlet 6 are provided with a heat exchange tube 2 in the tube box 1, and a heat exchange medium flow channel is formed inside the heat exchange tube 2, and the heat exchange tube 2 A flue gas flow channel is formed outside, and the flue gas flow channel is respectively connected with the flue gas inlet 3 and the flue gas outlet 4. The heat exchange medium flow channel includes a first heat exchange medium flow channel and a second heat exchange medium flow channel. and the third heat exchange medium flow channel, the heat exchange medium inlet 5 is connected with the first heat exchange medium flow channel, and the first heat exchange medium flow channel is connected with the second heat exchange medium flow channel through the first communication box 7 The heat exchange medium flow channel is connected, the third heat exchange medium flow channel is connected with the second heat exchange medium flow channel through the second communication box 8, and the heat exchange medium outlet 6 is connected with the third heat exchange medium flow channel connect.

The working principle of the boiler flue gas recovery device in this embodiment is as follows: the heat exchange medium enters the first heat exchange medium flow channel from the heat exchange medium inlet 5, and the flue gas enters the tube box 1 from the flue gas inlet 3 and passes through the flue gas flow. At this time, the heat exchange medium and the high temperature flue gas conduct the first heat exchange, and after the heat exchange, it enters the second heat exchange medium flow channel through the first communication box 7. At this time, the heat exchange medium and the high temperature flue gas conduct the second heat exchange. Heat exchange, after heat exchange, it enters the third heat exchange medium flow channel through the second communication box 8. At this time, the heat exchange medium and the high temperature flue gas conduct the third heat exchange, and the heat exchange medium after the third heat exchange is transferred from the heat exchange medium. The medium outlet 6 comes out, wherein the heat exchange medium outlet 6 can be connected with the heat exchange equipment, and the flue gas after heat exchange is discharged through the flue gas outlet 4 . The boiler flue gas recovery device can increase the contact time between the flue gas and the heat exchange medium by setting up three heat exchange medium flow passages, which is beneficial to reduce the boiler exhaust gas temperature, so that the high temperature flue gas can meet the condensation requirements and improve the boiler heat exchange. efficiency and flue gas recovery efficiency. After testing, the exhaust gas temperature in this embodiment can reach about 60°C.

Preferably, the heat exchange medium in this embodiment is cold air. The heat exchange medium of the device is air. Compared with the traditional water medium, the temperature difference between the flue gas and the heat exchange medium can be increased, and the flue gas recovery efficiency is high.

Preferably, the heat exchange tube 2 is a spiral fin structure. The heat exchange tube 2 is arranged in a spiral fin structure, which not only increases the rigidity and pressure bearing capacity of the fins, but also facilitates heat transfer, and the heat exchange area is 6-7 times that of a light tube of the same length. In addition, since the root of the fin is a small R and a smooth transition, it is not only convenient for heat transfer, but also the root of the fin is not easy to accumulate dust, and even a small amount of dust can be easily blown off, thereby ensuring effective heat transfer.

Preferably, the flue gas inlet 3 and the flue gas outlet 4 are respectively arranged on both sides of the pipe box 1 in the vertical direction. Specifically, the flue gas inlet 3 is arranged at the top of the tube box 1 , and the smoke outlet 4 is arranged at the bottom of the tube box 1 . In this way, the flue gas can preheat the third heat exchange medium flow channel and the second heat exchange medium flow channel first, which is beneficial to increase the heat exchange effect between the heat exchange medium and the flue gas.

Preferably, the heat exchange medium inlet 5 and the heat exchange medium outlet 6 are respectively disposed on both sides of the tube box 1 in the lateral direction. Specifically, the heat exchange medium inlet 5 is arranged on one side of the bottom of the tube box 1 , and the heat exchange medium outlet 6 is arranged on the other side of the top of the tube box 1 .

The above-mentioned embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited by this. Any insubstantial changes and replacements made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. The scope of protection of the present utility model.

Claims (7)

1. The boiler flue gas recovery device is characterized by comprising a pipe box, a first communicating box and a second communicating box, the tube box is provided with a flue gas inlet, a flue gas outlet, a heat exchange medium inlet and a heat exchange medium outlet, a heat exchange tube is arranged in the tube box, a heat exchange medium flow channel is formed inside the heat exchange tube, a flue gas flow channel is formed outside the heat exchange tube and is respectively connected with the flue gas inlet and the flue gas outlet, the heat exchange medium flow passage comprises a first heat exchange medium flow passage, a second heat exchange medium flow passage and a third heat exchange medium flow passage, the heat exchange medium inlet is connected with the first heat exchange medium flow passage, the first heat exchange medium flow passage is connected with the second heat exchange medium flow passage through a first communicating box, the third heat exchange medium flow passage is connected with the second heat exchange medium flow passage through a second communication box, and the heat exchange medium outlet is connected with the third heat exchange medium flow passage.

2. The boiler flue gas recovery device of claim 1, wherein the heat exchange tubes are of a spiral fin structure.

3. The boiler flue gas recovery device of claim 1, wherein the heat exchange medium is cold air.

4. The boiler flue gas recovery device according to claim 1, wherein the flue gas inlet and the flue gas outlet are respectively disposed at both sides of the tube box in a vertical direction.

5. The boiler flue gas recovery device according to claim 4, wherein the flue gas inlet is disposed at the top of the tube box, and the flue gas outlet is disposed at the bottom of the tube box.

6. The boiler flue gas recovery device according to claim 1, wherein the heat exchange medium inlet and the heat exchange medium outlet are respectively disposed at both sides of the tube box in the transverse direction.

7. The boiler flue gas recovery device according to claim 6, wherein the heat exchange medium inlet is disposed at one side of the bottom of the tube box, and the heat exchange medium outlet is disposed at the other side of the top of the tube box.

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