Heat exchanger

Abstract

The utility model provides a heat exchanger which comprises a steam furnace which comprises a steam outlet, a hearth and a flame tail gas collecting cavity, the hearth and the flame tail gas collecting cavity are communicated with each other, and the hearth is provided with a fresh air inlet; the heat exchange assembly is arranged on the steaming furnace and comprises a heat exchange channel arranged from bottom to top and two heat conduction pipe sets arranged in the heat exchange channel, and the heat exchange channel is provided with a first air outlet communicating with the fresh air inlet and a first air inlet communicating with the atmosphere; one end of the heat conduction pipe group is communicated with the flame tail gas collecting cavity, and the other end is communicated with the atmosphere; one end of the other heat conduction pipe group is communicated with the steam outlet, and the other end is communicated with the atmosphere; by means of the arrangement mode, waste heat of waste gas and waste steam can be used for conducting heat exchange on gas in the heat exchange channel and heating airflow in the heat exchange channel, so that fresh air can be preheated, the effect of effectively utilizing the waste heat is achieved, the waste heat can be fully utilized, heat waste is reduced, and the energy-saving and environment-friendly effects are achieved. The heat utilization rate is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of energy-saving steam furnaces, and in particular to a heat exchanger. Background Art

[0002] A steamer generates steam by heating water through a heating device. Currently, steamers are heated by electricity or flame. Steamers that use flame heating will produce exhaust gas. Most of the exhaust gas produced by current steamers is directly discharged, and steam will be directly discharged into the atmosphere during operation. Steam and exhaust gas contain a large amount of heat. Direct discharge will cause energy waste and result in low heat utilization of the steamer. Utility Model Content

[0003] In view of the above problems, the present application provides a heat exchanger that can be used on a steamer. The heat exchanger can utilize the waste heat generated by the steamer to preheat the fresh air entering the furnace, thereby making full use of the waste heat, reducing heat waste and improving heat utilization.

[0004] The utility model provides a heat exchanger, comprising:

[0005] A steamer, the steamer comprising a steam outlet, a furnace and a flame tail gas collecting chamber which are interconnected, and the furnace is provided with a fresh air inlet;

[0006] A heat exchange assembly is arranged on the steam boiler, comprising a heat exchange channel arranged from bottom to top and two groups of heat conduction pipe groups arranged inside the heat exchange channel, wherein the heat exchange channel is provided with a first air outlet connected to the fresh air inlet and a first air inlet connected to the atmosphere; one end of one group of heat conduction pipe groups is connected to the flame exhaust gas collecting chamber, and the other end is connected to the atmosphere; one end of the other group of heat conduction pipe groups is connected to the steam outlet, and the other end is connected to the atmosphere.

[0007] Specifically, through this arrangement, when the steamer is in use, the exhaust gas of the steamer can be discharged into the atmosphere through a group of heat conduction pipe groups, and the exhaust steam generated by the steamer can be discharged through another group of heat conduction pipe groups, so that the waste heat of the exhaust gas and exhaust steam can be used to exchange heat with the gas inside the heat exchange channel and heat the airflow inside the heat exchange channel. One end of the heat exchange channel is connected to the atmosphere, and the other end is connected to the fresh air inlet of the furnace of the steamer. The air entering the furnace flows through the flow channel, so that the fresh air can be preheated, thereby achieving the effect of effectively utilizing the waste heat, thereby making full use of the waste heat, reducing heat waste, and improving heat utilization.

[0008] Furthermore, the heat exchange channel includes a first section and a second section arranged adjacent to each other in parallel, two groups of the heat conduction pipe groups are arranged inside the first section and the second section, the first air outlet is arranged at the lower end of the first section, the upper end of the first section is connected to the upper end of the second section, and the first air inlet is arranged at the lower end of the second section.

[0009] Specifically, through this arrangement, the gas entering the heat exchange channel can be heat exchanged in sections through waste steam and combustion waste gas, thereby achieving a better heating effect on the fresh air.

[0010] Furthermore, a lower end of a group of heat-conducting tubes arranged in the first section is communicated with the flame exhaust gas collecting chamber, and an upper end of another group of heat-conducting tubes arranged in the second section is communicated with the steam outlet.

[0011] Specifically, through this arrangement, the fresh air that initially enters the heat exchange channel can be preliminarily preheated by steam exhaust gas with a relatively low temperature, and then the preliminarily preheated fresh air can be further heated by the combustion exhaust gas with a relatively high temperature, so that the fresh air can be heated to a higher temperature, thereby achieving better heat exchange efficiency and better preheating recovery. By connecting the upper end of another group of heat transfer pipes to the steam outlet, the steam can flow from top to bottom under its own air pressure, thereby increasing the heat exchange time and ensuring sufficient heat exchange. On the other hand, the vertical arrangement of the heat exchange channel is also conducive to the downstream flow of water condensed from steam and its timely discharge, thereby avoiding clogging of the pipeline by condensed water.

[0012] Furthermore, the first section and the second section are both arranged vertically, and the second section is arranged on a side of the first section away from the steam furnace.

[0013] Specifically, since condensed water is produced when steam exchanges heat with fresh air, the above-mentioned setting method can facilitate the discharge of condensed water, and the temperature of the fresh air will not be too high after exchanging heat with steam in the second section. By setting the second section on the outside away from the steamer, the second section with a relatively low temperature can be set on the periphery, thereby preventing users from contacting the high-temperature first section, thereby reducing the risk of scalding and improving safety.

[0014] Furthermore, a first air receiving elbow connected to the heat conduction pipe group is provided at the lower end of the first section, a second air receiving elbow connected to the first air outlet is provided on the side wall of the lower end of the first section away from the steam furnace, the flame exhaust gas collecting chamber is arranged above the furnace, the first air receiving elbow is bent and connected toward the flame exhaust gas collecting chamber, and the second air receiving elbow is bent and connected toward the furnace.

[0015] Specifically, through the above-mentioned setting method, the heat exchange channel can be connected to the steamer through two bent pipes, which can make the entire connection structure more compact and the structural layout more reasonable, thereby effectively reducing the floor space of the steamer and improving the utilization rate of the operating space.

[0016] Furthermore, an air collecting cavity communicating with an upper end of a heat conducting pipe group arranged in the first section is arranged at an upper end of the first section, and an exhaust fan is arranged on the air collecting cavity.

[0017] Specifically, by setting up an exhaust fan, combustion exhaust gas can be quickly discharged, thereby generating a certain negative pressure in the furnace. Under the action of the negative pressure, negative pressure can be generated in the heat exchange channel, so that air in the atmosphere can be sucked into the heat exchange channel, and then flows through the heat exchange channel into the furnace, prompting fresh air to flow through the heat exchange channel for heat exchange, which can increase the residence time of steam in the heat exchange tubes of another group of heat exchange units and fully exchange heat.

[0018] Furthermore, the steam furnace also includes a furnace chamber and an array of U-shaped heat pipes, one end of the array of U-shaped heat pipes is connected to the furnace, and the other end is connected to the flame exhaust gas collection chamber, and the array of U-shaped heat pipes is located inside the furnace chamber.

[0019] Furthermore, a water baffle is provided on the top of the furnace chamber, a baffle-type steam-water separator is provided above the water baffle, and the steam outlet is provided on the baffle-type steam-water separator.

[0020] Specifically, by setting a water baffle, boiling water below can be prevented from entering the steam-water separator. The steam-water separator can separate water from the exhaust steam. On the one hand, the water can be returned to the steam boiler for reuse, and on the other hand, the probability of water blocking the steam output pipeline can be reduced.

[0021] Furthermore, a condensed water collection chamber is provided at the lower end of another group of heat conduction pipe groups arranged in the second section.

[0022] Furthermore, the plurality of heat-conducting pipes of the heat exchange unit are arranged in an array in the flow channel.

[0023] Specifically, the plurality of heat pipes arranged in an array can increase the heat exchange area within the flow channel, thereby fully exchanging heat and improving the heat exchange efficiency.

[0024] Beneficial Effects

[0025] The utility model provides a heat exchanger, comprising: a steamer, the steamer comprising a steam outlet, a furnace and a flame tail gas collecting chamber that are interconnected, the furnace being provided with a fresh air inlet; a heat exchange component, arranged on the steamer, comprising a heat exchange channel arranged from bottom to top and two groups of heat conduction pipe groups arranged inside the heat exchange channel, the heat exchange channel being provided with a first air outlet that is connected to the fresh air inlet and a first air inlet that is connected to the atmosphere; one end of one group of the heat conduction pipe groups is connected to the flame tail gas collecting chamber, and the other end is connected to the atmosphere; one end of the other group of the heat conduction pipe groups is connected to the steam outlet, and the other end is connected to the atmosphere Through this arrangement, when the steamer is in use, the exhaust gas of the steamer can be discharged into the atmosphere through a group of heat-conducting pipe groups, and the exhaust steam generated by the steamer can be discharged through another group of heat-conducting pipe groups, so that the waste heat of the exhaust gas and the exhaust steam can be used to exchange heat with the gas inside the heat exchange channel and heat the airflow inside the heat exchange channel, and one end of the heat exchange channel is connected to the atmosphere, and the other end is connected to the fresh air inlet of the furnace of the steamer. The air entering the furnace flows through the flow channel, so that the fresh air can be preheated, thereby achieving the effect of effectively utilizing the waste heat, thereby making full use of the waste heat, reducing the waste of heat, and improving the utilization rate of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0027] Figure 1 A side structural schematic diagram of a heat exchange unit of a heat exchanger provided by the utility model.

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of a heat exchange unit at AA in a heat exchanger provided by the utility model.

[0029] Figure 3 The utility model provides a schematic diagram of the overall structure of a heat exchanger.

[0030] Figure 4 for Figure 3 The figure shows a schematic diagram of the cross-sectional structure at BB in a heat exchanger provided by the utility model.

[0031] Figure 5 This is a schematic diagram of the exploded structure of various components of a heat exchanger provided by the utility model.

[0032] Figure 6 for Figure 3 The figure shows a schematic diagram of the local enlarged structure of position C in a heat exchanger provided by the utility model. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The utility model provides a heat exchanger, as a specific implementation method, referring to Figure 1-Figure 3 , which includes:

[0036] The steamer 3 comprises a steam outlet 3232, a furnace 31 and a flame tail gas collecting chamber 34 which are interconnected, and the furnace 31 is provided with a fresh air inlet 312;

[0037] The heat exchange assembly 2 is arranged on the steam furnace 3, including a heat exchange channel 21 arranged from bottom to top and two groups of heat conduction pipe groups 22 arranged inside the heat exchange channel 21, the heat exchange channel 21 is provided with a first air outlet 211 connected to the fresh air inlet 312 and a first air inlet 210 connected to the atmosphere; one end of one group of the heat conduction pipe groups 22 is connected to the flame exhaust gas collecting chamber 34, and the other end is connected to the atmosphere; one end of the other group of the heat conduction pipe groups 22 is connected to the steam outlet 3232, and the other end is connected to the atmosphere.

[0038] Specifically, refer to Figure 3 A burner head 310 and a gas pipe 311 are arranged in the furnace. Gas is supplied to the burner head 310 through the gas pipe 311. The burner head burns the gas to heat the interior of the furnace, thereby realizing the heat exchange unit. When a steam furnace is used, the exhaust gas of the steam furnace can be discharged into the atmosphere through a group of heat-conducting pipe groups 22, and the exhaust steam generated by the steam furnace can be discharged through another group of heat-conducting pipe groups 22, so that the waste heat of the exhaust gas and the exhaust steam can be used to exchange heat with the gas inside the heat exchange channel 21, and the airflow inside the heat exchange channel 21 is heated, and the heat One end of the exchange channel 21 is connected to the atmosphere, and the other end is connected to the water heating effect inside the furnace chamber. Steam is generated after the water is heated, and high-temperature exhaust gas can be generated when the gas is burned. The exhaust gas can be discharged through a heat pipe group 22. The heat pipe group exchanges heat with the air inside the heat exchange channel. The fresh air inlet 312 of the furnace 31 of the steamer is connected to the heat exchange channel 21. The air entering the furnace 31 flows through the flow channel, so that the fresh air can be preheated, achieving the effect of effectively utilizing the waste heat, thereby making full use of the waste heat, reducing heat waste, and improving heat utilization.

[0039] Further, as a preferred embodiment, refer to Figure 1-Figure 6 The heat exchange channel 21 includes a first section 21a and a second section 21b which are adjacently arranged in parallel. The two groups of heat conduction pipe groups 22 are respectively arranged inside the first section and the second section. The first air outlet 211 is arranged at the lower end of the first section 21a. The upper end of the first section 21a is connected to the upper end of the second section 21b. The first air inlet 210 is arranged at the lower end of the second section 21b.

[0040] Specifically, refer to Figure 4 As a specific implementation, the heat exchange channel 21 is a pipe with a rectangular cross section, and the heat pipe group 22 is a plurality of heat pipes arranged in a matrix inside the pipe. The heat pipes are made of metal pipes. Figure 6 The lower end of the heat pipe is fixedly arranged at the end of the pipeline, and the interior of the heat pipe is not connected to the interior of the pipeline. Figure 5 The high-temperature exhaust gas in the furnace enters the interior of a group of heat-conducting pipes from the lower end of the heat-conducting pipes, and then flows out from the upper end through the heat-conducting pipes. The waste steam enters the upper end of another group of heat-conducting pipes, and flows through the other group of heat-conducting pipes from top to bottom under the action of its own gas pressure. The fresh air circulates inside the pipeline, thereby realizing heat exchange. Through this arrangement, the gas entering the heat exchange channel 21 can be heat exchanged in sections through the waste steam and the combustion exhaust gas, thereby achieving a better heating effect on the fresh gas; the entry of the waste steam can increase the residence time of the steam in the heat exchange pipes of the other group of heat exchange units, thereby fully exchanging heat.

[0041] Further, as a specific implementation method, refer to Figure 3 The lower end of a group of heat conduction pipe groups 22 arranged in the first section 21a is connected to the flame exhaust gas collecting chamber 34, and the upper end of another group of heat conduction pipe groups 22 arranged in the second section 21b is connected to the steam outlet 3232.

[0042] Specifically, in actual application, one group of heat-conducting pipe groups extends from one end to the other end along the extension direction of the first section, and the other group of heat-conducting pipe groups also extends from one end to the other end along the extension direction of the second section. Both groups of heat-conducting pipe groups are arranged in this way. The steam exhaust gas with a relatively low temperature can be used to preliminarily preheat the fresh air that initially enters the heat exchange channel 21, and then the combustion exhaust gas with a relatively high temperature can be used to further heat the preliminarily preheated fresh air, so that the fresh air can be heated to a higher temperature, thereby achieving better heat exchange efficiency and better preheating recovery. By connecting the upper end of the other group of heat-conducting pipe groups 22 with the steam outlet 3232, the steam can flow from top to bottom under its own gas pressure, thereby increasing the heat exchange time and ensuring sufficient heat exchange. Heat, on the other hand, the vertical setting of the heat exchange channel is also conducive to the downward flow of water condensed from steam and its timely discharge to avoid condensed water clogging the pipeline; for example, when the flow direction of fresh air in the flow channel 21 is from top to bottom, the flow direction of high-temperature exhaust gas with residual heat in the heat pipe 22 is from bottom to top. Through the above-mentioned setting, fresh air enters the second section from the first air inlet 210, flows through another group, and then flows out from the upper end outlet 21b-1 of the first section, flows into the inlet 21a-1 at the upper end of the first section, flows through the first section from top to bottom, and exchanges heat with a group of heat pipe groups in the first section, so that the air flowing through the first section and the second section can be opposite to the flow direction of the fluid inside the heat pipe group arranged inside the first section and the second section, thereby achieving a better heat exchange effect.

[0043] Further, it should be noted that the steam outlet 3232 provides steam to the outside, is connected to a steamer (not shown in the figure) for steaming food, and heats the food in the steamer. In a specific embodiment, the steamer is provided with an outlet for discharging waste steam, and the outlet on the steamer is connected to the upper end of another group of heat conduction pipe groups 22, and the waste steam in the steamer is discharged into another group of heat conduction pipe groups 22 for heat exchange.

[0044] Furthermore, the first section and the second section are both arranged vertically, and the second section is arranged on a side of the first section away from the steam oven 3 .

[0045] Specifically, as a preferred embodiment, since condensed water is produced when steam exchanges heat with fresh air, the above-mentioned setting method can facilitate the discharge of condensed water, and the temperature of the fresh air will not be too high after the heat exchange with steam in the second section. By setting the second section on the outside away from the steamer, the second section with a relatively low temperature can be set on the periphery, thereby preventing the user from contacting the high-temperature first section, thereby reducing the risk of scalding and improving safety.

[0046] Further, as a specific implementation method, refer to Figure 3 , Figure 5 , Figure 6A first air receiving elbow 221 connected to the heat conduction pipe group 22 is provided at the lower end of the first section 21a, and a second air receiving elbow 2110 connected to the first air outlet 211 is provided on the side wall of the lower end of the first section away from the steam furnace. The flame exhaust gas collecting chamber 34 is arranged above the furnace 31, and the first air receiving elbow 221 is bent and connected toward the flame exhaust gas collecting chamber 34, and the second air receiving elbow 2110 is bent and connected toward the furnace 31.

[0047] Specifically, the first air receiving elbow 221 and the second air receiving elbow 2110 can be welded to the heat exchange channel 21. Through the above-mentioned setting method, the heat exchange channel can be connected to the steamer through the two elbows, which can make the entire connection structure more compact and the structural layout more reasonable, thereby effectively reducing the floor space of the steamer and improving the utilization rate of the operating space.

[0048] Further, as a specific implementation, the upper end of the first section 21 a is provided with an air collecting cavity 222 which is connected with the upper end of the heat conducting pipe group 22 arranged in the first section 21 a , and the air collecting cavity 222 is provided with an exhaust fan 23 .

[0049] Specifically, by providing an exhaust fan 23, the combustion exhaust gas can be quickly discharged, thereby generating a certain negative pressure in the furnace. Under the action of the negative pressure, negative pressure can be generated in the heat exchange channel 21, so that air in the atmosphere can be sucked into the heat exchange channel 21, and then flows through the heat exchange channel 21 into the furnace, prompting fresh air to flow through the heat exchange channel for heat exchange.

[0050] Further, as a specific implementation method, refer to Figure 3 , Figure 5 The steam furnace 3 also includes a furnace chamber and an array U-shaped heat pipe 33. One end of the array U-shaped heat pipe 33 is connected to the furnace 31, and the other end is connected to the flame exhaust gas collecting chamber 34. The array U-shaped heat pipe 33 is located inside the furnace chamber.

[0051] Specifically, through this arrangement, when the exhaust fan 23 draws air, a negative pressure can be generated in the flame exhaust collection chamber 34, so that a suction effect can be generated in the furnace through the row of U-shaped heat pipes 33, so that the flame can enter the interior of the row of U-shaped heat pipes 33. The row of U-shaped heat pipes 33 are located in the furnace chamber, and water is provided in the furnace chamber. The liquid level 91 submerges the row of U-shaped heat pipes 33, which can be more conducive to heat exchange between the row of U-shaped heat pipes 33 and water, thereby improving the heating efficiency.

[0052] Further, refer to Figure 3 , Figure 4As a specific implementation, a water baffle 321 is provided on the top of the furnace chamber, a baffle-type steam-water separator 323 is provided above the water baffle, and the steam outlet 3232 is provided on the baffle-type steam-water separator 323.

[0053] Specifically, by providing a baffle-type steam-water separator 323, the waste steam can flow out through the baffle-type steam-water separator 323, and by providing a water baffle, the boiling water below can be prevented from entering the steam-water separator. The water in the waste steam can be separated by the steam-water separator. On the one hand, the water can be returned to the steam boiler for reuse, and on the other hand, the probability of water blocking the steam output pipeline can be reduced.

[0054] Further, as a specific implementation method, refer to Figure 2 A condensed water collecting chamber 325 is provided at the lower end of another group of heat conducting pipes 22 arranged in the second section 21b.

[0055] Specifically, the condensed water collection chamber 325 is provided to collect the condensed water for reuse.

[0056] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A heat exchanger, characterized in that: include: A steam furnace (3), the steam furnace comprising a steam outlet (3232), a furnace (31) and a flame tail gas collection chamber (34) which are interconnected, the furnace (31) being provided with a fresh air inlet (312); A heat exchange assembly (2) is arranged on the steam furnace (3), comprising a heat exchange channel (21) arranged from bottom to top and two groups of heat conduction pipe groups (22) arranged inside the heat exchange channel (21); the heat exchange channel (21) is provided with a first air outlet (211) connected to the fresh air inlet (312) and a first air inlet (210) connected to the atmosphere; one end of one group of the heat conduction pipe groups (22) is connected to the flame exhaust gas collection chamber (34), and the other end is connected to the atmosphere; one end of the other group of the heat conduction pipe groups (22) is connected to the steam outlet (3232), and the other end is connected to the atmosphere.

2. A heat exchanger according to claim 1, characterized in that: The heat exchange channel (21) comprises a first section (21a) and a second section (21b) which are arranged adjacent to each other in parallel, the two groups of heat conduction pipe groups (22) are arranged inside the first section and the second section respectively, the first air outlet (211) is arranged at the lower end of the first section (21a), the upper end of the first section (21a) is connected to the upper end of the second section (21b), and the first air inlet (210) is arranged at the lower end of the second section (21b).

3. A heat exchanger according to claim 2, characterized in that: The lower end of a group of heat conduction pipes (22) arranged in the first section (21a) is communicated with the flame exhaust gas collection chamber (34), and the upper end of another group of heat conduction pipes (22) arranged in the second section (21b) is communicated with the steam outlet (3232).

4. A heat exchanger according to claim 3, characterized in that: The first section and the second section are both arranged vertically, and the second section is arranged on a side of the first section away from the steam oven (3).

5. A heat exchanger according to claim 3, characterized in that: A first air receiving elbow (221) connected to the heat conducting pipe group (22) is provided at the lower end of the first section (21a); ​​a second air receiving elbow (2110) connected to the first air outlet (211) is provided on a side wall of the lower end of the first section away from the steam furnace; the flame exhaust gas collecting chamber (34) is arranged above the furnace (31); the first air receiving elbow (221) is bent and connected in the direction of the flame exhaust gas collecting chamber (34); and the second air receiving elbow (2110) is bent and connected in the direction of the furnace (31).

6. A heat exchanger according to claim 5, characterized in that: The upper end of the first section (21a) is provided with an air collecting cavity (222) which is in communication with the upper end of a heat conducting pipe group (22) arranged in the first section (21a), and an exhaust fan (23) is arranged on the air collecting cavity (222).

7. A heat exchanger according to claim 6, characterized in that: The steam furnace (3) further comprises a furnace chamber and an array of U-shaped heat pipes (33); one end of the array of U-shaped heat pipes (33) is in communication with the furnace chamber (31), and the other end is in communication with the flame exhaust gas collecting chamber (34); the array of U-shaped heat pipes (33) is located inside the furnace chamber.

8. A heat exchanger according to claim 7, characterized in that: A water baffle (1) is provided on the top of the furnace chamber, a baffle-type steam-water separator (323) is provided above the water baffle, and the steam outlet (3232) is provided on the baffle-type steam-water separator (323).

9. A heat exchanger according to claim 8, characterized in that: A condensed water collection chamber (325) is provided at the lower end of another group of heat conduction pipes (22) arranged in the second section (21b).

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