Heat exchanger of combustion furnace

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger of a combustion furnace, which comprises a first heat exchange chamber, a second heat exchange chamber, a heat exchange structure, an air inlet box and a fan, the first heat exchange chamber is positioned on the outer side of the combustion furnace and comprises a first air inlet and a first air outlet, and the second heat exchange chamber is positioned on the outer side of the heat exchange structure and comprises a second air inlet and a second air outlet. The second heat exchange chamber comprises a second air inlet and a second air outlet, the first air outlet communicates with the second air inlet, the fan is installed at the second air outlet, and the heat exchange structure communicates with the output end of the combustion furnace through the air inlet box and is used for receiving hot air output by the combustion furnace and conducting heat exchange with air entering the second heat exchange chamber; the first heat exchange chamber is arranged on the outer side of the combustion furnace, the second heat exchange chamber is arranged on the outer side of the heat exchange structure, and the first heat exchange chamber communicates with the second heat exchange chamber, so that cold air entering from the first air inlet can be subjected to two-stage heat exchange, heat loss generated by heat dissipation from the furnace body is reduced, and the utilization rate of heat generated by the combustion furnace is increased.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a heat exchanger for a combustion furnace. Background Technology

[0002] A heat exchanger is a device used to transfer some of the heat from a hot fluid to a cold fluid. Its main function is to achieve heat transfer and ensure that the medium maintains the specific temperature required by the process. Heat exchangers are widely used in various industrial fields such as chemical, petroleum, power, and food. In combustion furnace systems, heat exchangers are typically used to recover and utilize the heat generated during combustion to improve the overall thermal efficiency of the system.

[0003] Existing heat exchangers for combustion furnace systems typically fall into two categories. One type is installed inside the combustion furnace, utilizing the heat released from combustion within the furnace to heat the medium within the heat exchanger. For example, application publication number CN110114620A discloses a heat exchanger equipped with steel heat exchange piping that circulates the liquid medium within the combustion furnace. The combustion exhaust gases generated from burning bamboo strips in the furnace come into contact with the heat exchange piping, thus heating the liquid medium. This heat exchanger, located inside the combustion furnace, exhibits high heat exchange efficiency during operation.

[0004] Another type is located at the output end of the combustion furnace, where heat exchange occurs between the hot flue gas output from the combustion furnace and the medium in the heat exchanger. For example, Chinese patent application CN109268817A discloses a biomass combustion furnace heating system. This heating system includes a combustion furnace, a water storage tank, and a heat exchanger. The water inlet of the combustion furnace is connected to the water outlet of the water storage tank, the water inlet of the water storage tank is connected to the water outlet of the heat exchanger, and the water inlet of the heat exchanger is connected to the water outlet of the combustion furnace. The hot flue gas output from the combustion furnace heats the water flow to achieve the purpose of heating.

[0005] The aforementioned heat exchanger is installed inside or at the output end of the combustion furnace. It exchanges heat with the combustion heat inside the furnace or the hot flue gas output from the output end. Only a portion of the heat generated by the combustion reaction inside the combustion furnace is transported out through the output end, while the other portion of the heat dissipates to the outside through the transport pipes and the furnace body. During use, the aforementioned heat exchanger only exchanges heat with the heat source air output from the output end of the furnace body, which will cause some heat loss from the combustion reaction, thereby reducing the utilization rate of the output heat of the combustion furnace and resulting in certain economic losses. Utility Model Content

[0006] This invention provides a heat exchanger for a combustion furnace, which can improve the utilization rate of the output heat of the combustion furnace.

[0007] To solve the above problems, the heat exchanger for a combustion furnace provided by this utility model adopts the following technical solution:

[0008] A heat exchanger for a combustion furnace includes a first heat exchange chamber, a second heat exchange chamber, a heat exchange structure, an air inlet box, and a fan. The first heat exchange chamber surrounds the outside of the combustion furnace and includes a first air inlet and a first air outlet. The second heat exchange chamber surrounds the outside of the heat exchange structure and includes a second air inlet and a second air outlet. The first air outlet and the second air inlet are connected. The fan is installed at the second air outlet. The heat exchange structure is connected to the output end of the combustion furnace through the air inlet box and is used to receive hot air output from the combustion furnace and exchange heat with air entering the second heat exchange chamber.

[0009] The heat exchanger of the combustion furnace of this utility model sets a first heat exchange chamber on the outside of the combustion furnace and a second heat exchange chamber on the outside of the heat exchange structure, and connects the first heat exchange chamber and the second heat exchange chamber. This allows the cold air entering from the first air inlet to undergo two stages of heat exchange, reducing the heat loss caused by the heat generated by the combustion furnace due to the furnace body, thereby improving the utilization rate of the output heat of the combustion furnace.

[0010] Furthermore, the air inlet box is a rectangular box located at the upper end of the combustion furnace. The air inlet box includes an inlet for connecting to the output end of the combustion furnace, an output port for connecting to the heat exchange tube assembly, an automatic pressure relief valve, and an air regulating damper. The automatic pressure relief valve is used to regulate the pressure inside the heat exchanger, and the air regulating damper is used to input cold air into the air inlet box to regulate the temperature of the heat source air output by the combustion furnace.

[0011] Furthermore, the second heat exchange chamber also includes a heat exchange cavity and an ash collection cavity located below the heat exchange cavity. The heat exchange cavity is provided with multiple guide plates extending to the left and right, which are used to divide the heat exchange cavity into S-shaped channels.

[0012] Furthermore, the heat exchange structure is located inside the heat exchange cavity and includes a left heat exchange component and a right heat exchange component. Both the left and right heat exchange components include multiple heat exchange tubes that run parallel to each other and extend vertically. The heat exchange tubes pass through each guide plate. The upper end of the left heat exchange component is connected to the output port of the air inlet box, and its lower end is connected to the ash collection cavity. The lower end of the right heat exchange component is connected to the ash collection cavity, and its upper end is connected to an external pipe.

[0013] Furthermore, the lower end of the second heat exchange chamber has a cleaning port corresponding to the ash collection chamber.

[0014] Furthermore, both the first and second heat exchange chambers are composed of detachable sheet wall panels, which are made of insulation material.

[0015] Furthermore, the upper end of the second heat exchange chamber has a temperature sensor for monitoring the temperature of the heat source air entering the left heat exchange assembly.

[0016] The beneficial effects of the heat exchanger for a combustion furnace provided by this utility model are:

[0017] 1. The heat exchanger of the combustion furnace of this utility model sets a first heat exchange chamber on the outside of the combustion furnace and a second heat exchange chamber on the outside of the heat exchange structure, and connects the first heat exchange chamber and the second heat exchange chamber, so that the cold air entering from the first air inlet can undergo two stages of heat exchange, reducing the heat loss caused by the heat generated by the combustion furnace due to the furnace body, thereby improving the utilization rate of the output heat of the combustion furnace.

[0018] 2. By setting multiple guide vanes that divide the heat exchange chamber into S-shaped channels, the movement distance of air in the heat exchange chamber can be increased, the residence time of air in the heat exchange chamber can be extended, and thus the heat exchange effect of the heat exchanger can be enhanced.

[0019] 3. The ash collection chamber can discharge ash from the heat source air output by the combustion furnace, preventing blockage of the heat exchange structure. This not only improves the operational stability of the heat exchanger but also reduces its maintenance costs.

[0020] 4. By using sheet-like wall panels to splice together the first and second heat exchange chambers, the installation difficulty of the heat exchanger is reduced, while the furnace body is isolated, providing a safety protection function. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a heat exchanger for a combustion furnace provided by this utility model;

[0022] Figure 2 A front view of a heat exchanger for a combustion furnace provided by this utility model;

[0023] Figure 3 for Figure 1 The diagram shows the structure of the first heat exchange chamber.

[0024] Figure 4 for Figure 1 The schematic diagram of the second heat exchange chamber shown is as follows.

[0025] Figure 5 for Figure 1 The diagram shows the internal structure of the second heat exchange chamber.

[0026] Figure 6 This is a schematic diagram of the flow paths of cold air and hot air.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First heat exchange chamber; 11. First housing; 12. First air inlet; 13. First air outlet; 14. Connecting channel;

[0029] 2. Second heat exchange chamber; 21. Second housing; 211. Heat exchange cavity; 212. Ash collection cavity; 214. Ash removal port; 22. Second air inlet; 23. Second air outlet; 24. Top box; 241. Left air chamber; 242. Right air chamber; 243. Exhaust outlet; 244. Temperature sensor; 25. Guide plate; 26. Structural plate;

[0030] 3. Heat exchange structure; 31. Left heat exchange assembly; 32. Right heat exchange assembly; 33. Heat exchange tube;

[0031] 4. Air inlet box; 41. Input port; 42. Output port; 43. Air damper; 44. Automatic pressure relief valve; 5. Combustion furnace. Detailed Implementation

[0032] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0033] Embodiment 1 of a heat exchanger for a combustion furnace provided by this utility model:

[0034] like Figures 1 to 6 As shown, the heat exchanger of the combustion furnace 5 includes a first heat exchange chamber 1, a second heat exchange chamber 2, an air inlet box 4, a heat exchange structure 3, and a fan. The first heat exchange chamber 1 surrounds the outside of the combustion furnace 5 and is used to recover heat dissipated from the furnace body. The heat exchange structure 3 is connected to the output end of the combustion furnace 5, and is positioned on the right side of the combustion furnace 5. The second heat exchange chamber 2 surrounds the outside of the heat exchange structure 3 and is used to exchange heat between the hot air output from the first heat exchange chamber 1 and the heat source air output from the combustion furnace 5. The air inlet box 4 is located between the combustion furnace 5 and the heat exchange structure 3, connecting the two. The fan drives the airflow within the heat exchanger.

[0035] The first heat exchange chamber 1 will be introduced below, such as... Figures 1 to 3 As shown, the first heat exchange chamber 1 includes a first housing 11, a first air inlet 12, a first air outlet 13, and a connecting channel 14. The first housing 11 is a rectangular box that surrounds the outside of the combustion furnace 5 and is assembled from multiple rectangular sheet wall panels. The sheet wall panels are made of polyurethane board to ensure the structural strength and thermal insulation performance of the first heat exchange chamber 1. The first air inlet 12 is located at the upper end of the first housing 11, and a horizontally extending steel grating is installed on the first air inlet 12. The steel grating serves as a maintenance platform for the combustion furnace 5 and prevents debris from entering the heat exchanger. The first air outlet 13 is located at the lower right end of the first housing 11. The connecting channel 14 is located between the first heat exchange chamber 1 and the second heat exchange chamber 2. The left end of the connecting channel 14 is fixedly connected to the first air outlet 13, and its right end is connected to the second heat exchange chamber 2 to output air that has undergone the first heat exchange to the second heat exchange chamber 2.

[0036] The following describes air inlet box 4, such as... Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the air inlet box 4 is a rectangular box located above the output end of the combustion furnace 5. The lower left end of the air inlet box 4 has an inlet port 41, which connects to the output end of the combustion furnace 5. The lower right end of the air inlet box 4 has an output port 42, which connects to the heat exchange structure 3 and supplies heat source air to the heat exchange structure 3. The upper left end of the air inlet box 4, corresponding to the inlet port 41, is equipped with an air regulating damper 43. The damper 43 is used to input cold air into the air inlet box 4 to regulate the temperature of the heat source air entering the heat exchanger. The left end of the air inlet box 4 has an automatic pressure relief valve 44, which automatically regulates the pressure inside the air inlet box 4 to prevent the heat exchanger from exploding due to excessive internal pressure.

[0037] The following describes heat exchange structure 3, such as... Figure 5 As shown, the heat exchange structure 3 includes a left heat exchange component 31 and a right heat exchange component 32. Both the left and right heat exchange components 31 and 32 include multiple parallel and vertically extending heat exchange tubes 33. The heat exchange tubes 33 are made of steel. The upper end of the left heat exchange component 31 is connected to the output port 42 of the air inlet box 4, and is used to receive the heat source air output from the air inlet box 4 and convey it downward. The lower end of the left heat exchange component 31 is connected to the lower end of the right heat exchange component 32, and the right heat exchange component 32 is used to receive the heat source air output from the left heat exchange component 31 and convey it upward. In other embodiments, the heat exchange tubes 33 are made of aluminum or copper.

[0038] The second heat exchange chamber 2 is described below, such as... Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the second heat exchange chamber 2 includes a second housing 21, a second air inlet 22, a second air outlet 23, and a top housing 24. The second housing 21 is a rectangular box that surrounds the heat exchange structure 3 and is assembled from multiple rectangular sheet wall panels. Its lower end has a concrete base for supporting the second housing 21. The second housing 21 includes a heat exchange cavity 211 and an ash collection cavity 212 located below the heat exchange cavity 211. A structural plate 26 separates the heat exchange cavity 211 and the ash collection cavity 212. The heat exchange structure 3 is fixedly installed inside the heat exchange cavity 211. The lower ends of the heat exchange tubes 33 of the left heat exchange component 31 and the right heat exchange component 32 are connected to the ash collection cavity 212 to discharge solid impurities from the heat source air. The front and rear sides of the second housing 21 are provided with cleaning ports 214 corresponding to the ash collection cavity 212 for easy cleaning by operators.

[0039] The second air inlet 22 is located at the lower left end of the second housing 21 and is fixedly connected to the connecting channel 14, used to supply air that has undergone one heat exchange into the heat exchange chamber 211. Two horizontally extending guide plates 25 are provided vertically within the heat exchange chamber 211. The lower guide plate 25 is positioned near the left side wall of the second housing 21, and the upper guide plate 25 is positioned near the right side wall of the second housing 21, so that the air flows in an S-shape from bottom to top within the heat exchange chamber 211. The second air outlet 23 is located at the front of the second housing 21 and at the upper end of the heat exchange chamber 211. A fan is installed on the second air outlet 23 to drive the air within the heat exchange chamber 211.

[0040] The top chamber 24 is located between the second chamber 21 and the air inlet chamber 4. The top chamber 24 includes a left air chamber 241 and a right air chamber 242. The left air chamber 241 is used to connect the outlet 42 and the upper end of the left heat exchange component 31. The lower end of the right air chamber 242 is connected to the upper end of the right heat exchange component 32. The upper end of the air chamber has an exhaust port 243 facing to the right, which is used to output the heat source air after secondary heat exchange. Temperature sensors 244 are installed in the left air chamber 241, the first air inlet 12, and the right air chamber 242 to monitor the temperature of the heat source air entering the first heat exchange chamber 1, entering the left air chamber 241, and outputting from the right air chamber 242, respectively, so as to detect the heat exchange efficiency of the heat exchanger through the feedback of each temperature sensor 244.

[0041] The working principle of heat exchangers is summarized as follows:

[0042] like Figure 6 As shown, under the action of the fan, the cold air from the outside enters the first heat exchange chamber 1 from the first air inlet 12, absorbs the heat dissipated from the furnace body of the combustion furnace 5 in the first heat exchange chamber 1, and then enters the heat exchange cavity 211 through the connecting channel 14, thus completing one heat exchange.

[0043] The hot air generated in the combustion furnace 5 enters the heat exchange structure 3 through the air inlet box 4 and the top box 24, then passes sequentially through the heat exchange tubes 33 of the left heat exchange component 31 and the right heat exchange component 32, and finally exits from the exhaust port 243 of the top box 24. The cold air entering the heat exchange chamber 211 flows in an S-shape from bottom to top under the guidance of the baffle plate 25. Simultaneously, the cold air undergoes secondary heat exchange with the hot air through the heat exchange tubes 33. The S-shaped airflow path prolongs the heat exchange time of the cold air, improving the heat exchanger's efficiency. Finally, the air after secondary heat exchange is exited from the second exhaust port 23.

[0044] Embodiment 2 of a heat exchanger for a combustion furnace provided by this utility model:

[0045] Its main difference from Example 1 is:

[0046] In Example 1, the fan is installed at the second air outlet.

[0047] In this embodiment, the fan is installed on the connecting channel between the first heat exchange chamber and the second heat exchange chamber.

[0048] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0049] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A heat exchanger for a combustion furnace, characterized by The heat exchanger comprises a first heat exchange chamber, a second heat exchange chamber, a heat exchange structure, an air inlet box and a fan, the first heat exchange chamber is surrounded outside the combustion furnace and comprises a first air inlet and a first air outlet, the second heat exchange chamber is surrounded outside the heat exchange structure and comprises a second air inlet and a second air outlet, the first air outlet is communicated with the second air inlet, the fan is installed at the second air outlet, the heat exchange structure is communicated with the output end of the combustion furnace through the air inlet box for receiving the hot air output by the combustion furnace and exchanging heat with the air entering the second heat exchange chamber.

2. A heat exchanger for a combustion furnace according to claim 1, wherein The air inlet box is a rectangular box located at the upper end of the combustion furnace, the air inlet box comprises an input port for connecting the output end of the combustion furnace, an output port for connecting the heat exchange pipe assembly, an automatic pressure relief valve for adjusting the pressure in the heat exchanger and an air damper for inputting cold air into the air inlet box to adjust the temperature of the hot air output by the combustion furnace.

3. A heat exchanger for a combustion furnace according to claim 1, wherein The second heat exchange chamber further comprises a heat exchange cavity and an ash collection cavity located at the lower side of the heat exchange cavity, a plurality of left and right extending guide plates are arranged in the heat exchange cavity, the guide plates are used for separating the heat exchange cavity into S-shaped channels.

4. A heat exchanger for a combustion furnace according to claim 3, wherein The heat exchange structure is located in the heat exchange cavity and comprises a left heat exchange assembly and a right heat exchange assembly, the left heat exchange assembly and the right heat exchange assembly each comprise a plurality of heat exchange pipes arranged in parallel and extending up and down, the heat exchange pipes are arranged on the guide plates; the upper end of the left heat exchange assembly is connected with the output port of the air inlet box, and the lower end thereof is communicated with the ash collection cavity, the lower end of the right heat exchange assembly is communicated with the ash collection cavity, and the upper end thereof is communicated with the pipeline outside.

5. A heat exchanger for a combustion furnace according to claim 4, wherein The lower end of the second heat exchange chamber is provided with an ash cleaning port corresponding to the ash collection cavity.

6. A heat exchanger for a combustion furnace according to claim 1, wherein The first heat exchange chamber and the second heat exchange chamber are each composed of detachable sheet-shaped wallboards made of thermal insulation materials.

7. A heat exchanger for a combustion furnace according to claim 4, wherein The upper end of the second heat exchange chamber is provided with a temperature sensor for monitoring the temperature of the hot air entering the left heat exchange assembly.

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