Efficient methanol combustion and heat exchange device

Abstract

The utility model discloses an efficient methanol combustion and heat exchange device which comprises a double-layer heat exchange box, a combustion cavity shell, a conical flow guide cover and an exhaust fume collecting hood, the combustion cavity shell, the conical flow guide cover and the exhaust fume collecting hood are arranged in the double-layer heat exchange box, the combustion cavity shell is located at the first end of the double-layer heat exchange box, and the exhaust fume collecting hood is located at the second end of the double-layer heat exchange box. The flow guide cover is located between the first end and the second end, the double-layer heat exchange box is connected with the exhaust fume collecting hood through a connecting pipe, and under the condition that fluid flows to the exhaust fume collecting hood from the double-layer heat exchange box, heat exchange can be conducted between the fluid and the combustion cavity shell and between the fluid and the exhaust fume collecting hood in sequence. The combustion chamber is designed to be in a corresponding long barrel shape according to the combustion power, the tail end of the combustion cavity is made to be in a funnel shape, high-temperature flue gas can be gathered and then smoothly passes through the spiral flow deflectors, the oxidation-reduction reaction time is prolonged, and the high-temperature flue gas is fully combusted, then flows through the fin type heat exchanger to be subjected to heat exchange and then is discharged into the atmosphere.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion and heat exchange devices, in particular to a high-efficiency methanol combustion and heat exchange device. Background Art

[0002] Methanol fuel is in liquid state at normal temperature and pressure. To make it burn fully, it must be changed from liquid to gas. At present, methanol combustion generally adopts two methods. The first method is atomization combustion. The methanol in the fuel pipeline is pressurized by a methanol pump so that it is sprayed out from the nozzle to form a mist, and then ignited by an electric arc. When the mist methanol is ignited, the methanol particles must first change into a gaseous state before burning. However, methanol absorbs heat during the gasification process, resulting in a decrease in temperature from the nozzle end to the combustion zone, making the methanol flame temperature low, the flame length longer, and the flame shape loose and non-condensed. If there is not enough combustion space and combustion time, it will lead to incomplete combustion. The second method is preheating gasification combustion. This combustion method is an improvement on the first method. Before the methanol fuel enters the combustion chamber, it is heated to the gasification temperature by means of a heating rod and the like before burning. After the combustion is stable, the heat generated by the methanol combustion is fully utilized to gasify it, so the methanol sprayed from the combustion port is already in a gaseous state. However, the main heat of its gasification still comes from the combustion of methanol itself. Therefore, no matter which method is adopted, the flame length and flame shape of methanol will not change substantially. In addition, because the loose flame directly burns the inner wall of the combustion chamber, high requirements are placed on the material and insulation. Based on this, it is necessary to design a furnace chamber suitable for its combustion and heat exchange according to the combustion characteristics of methanol, so as to solve the problems of long flame length and loose and non-condensed flame shape, and to improve the heat exchange efficiency and durability of the furnace chamber. Therefore, the present application aims to provide an efficient methanol combustion and heat exchange device that can achieve the above functions. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-efficiency methanol combustion and heat exchange device.

[0004] The purpose of the utility model is achieved through the following technical solutions: a high-efficiency methanol combustion and heat exchange device, comprising a double-layer heat exchange box and a combustion chamber shell, a conical air guide cover and a smoke collector hood arranged in the double-layer heat exchange box, the combustion chamber shell is located at the first end of the double-layer heat exchange box, the smoke collector hood is located at the second end of the double-layer heat exchange box, the air guide cover is located between the first end and the second end, the double-layer heat exchange box is connected to the smoke collector hood via a connecting pipe, wherein, when the fluid flows from the double-layer heat exchange box to the smoke collector hood, the fluid can exchange heat with the combustion chamber shell and the smoke collector hood in turn.

[0005] Preferably, the connecting pipe is connected to a fin-type heat exchanger, and the fin-type heat exchanger is in contact with the smoke collecting hood.

[0006] Preferably, the conical air guide cover is connected to the smoke collecting hood via a plurality of air guide pipes, and swirl plates are provided in the air guide pipes.

[0007] Preferably, a smoke exhaust pipe is provided on the smoke collecting hood, and the smoke exhaust pipe can be communicated with the smoke collecting hood.

[0008] Preferably, a methanol pump and a burner which are connected to each other are provided on the first end, and a nozzle is provided in the combustion chamber shell, and the nozzle is connected to the burner.

[0009] Preferably, the conical air guide cover is provided with a plurality of air guide holes, and the air guide holes are connected to the air guide pipes one-to-one.

[0010] Preferably, the double-layer heat exchange box is provided with a first water outlet and a first water inlet, and the fin-type heat exchanger is provided with a second water inlet and a second water outlet.

[0011] The utility model has the following advantages:

[0012] (1) The combustion chamber is designed into a corresponding long barrel shape according to the combustion power, and a funnel shape is made at the end of the combustion chamber so that the high-temperature flue gas can be gathered and then smoothly pass through the spiral guide vane, increasing the redox reaction time, allowing it to be fully burned and then flow through the fin-type heat exchanger for heat exchange before being discharged into the atmosphere.

[0013] (2) The loose shape of the flame will also cause the flame to directly burn the outer wall of the combustion chamber, making the temperature of the outer wall of the combustion chamber higher and the heat loss greater. Both the material and insulation of the combustion chamber are required to be high. The commonly used method is to use insulation cotton for insulation, but in order to meet the length and width of the fire, the surface of the combustion chamber is large. If the high-temperature outer wall is insulated, a large amount of insulation material is required. Therefore, the combustion chamber is designed as an inner double-layer structure, and water is filled in the middle layer of the combustion chamber. The water in the middle layer is connected to the pipe of the fin-type heat exchanger and added to the heat exchange cycle. The use of water-wrapped fire not only solves the insulation problem, but also improves the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the methanol combustion and heat exchange device of the utility model;

[0015] In the figure, 1-methanol pump, 2-burner, 3-nozzle, 4-first water outlet, 5-combustion chamber shell, 6-conical guide cover, 7-guide hole, 8-double-layer heat exchange box, 9-guide pipe, 10-swirl plate, 11-first water inlet, 12-smoke hood, 13-second water inlet, 14-smoke exhaust pipe, 15-second water outlet, 16-connecting pipe, 17-fin heat exchanger. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings, and the protection scope of the utility model is not limited to the following:

[0017] like Figure 1 As shown, the present application provides an efficient methanol combustion and heat exchange device, including a double-layer heat exchange box 8 and a combustion chamber shell 5, a conical flow guide hood 6 and a smoke hood 12 arranged in the double-layer heat exchange box 8, the combustion chamber shell 5 is located at the first end of the double-layer heat exchange box 8, the smoke hood 12 is located at the second end of the double-layer heat exchange box 8, the flow guide hood 6 is located between the first end and the second end, and the double-layer heat exchange box 8 is connected to the smoke hood 12 via a connecting pipe 16, wherein, when the fluid flows from the double-layer heat exchange box 8 to the smoke hood 12, the fluid can sequentially exchange heat with the combustion chamber shell 5 and the finned heat exchanger 17 in the smoke hood 12. The connecting pipe 16 is connected to the finned heat exchanger 17, and the finned heat exchanger 17 abuts against the smoke hood 12. The conical flow guide hood 6 is connected to the smoke hood 12 via a plurality of flow guide pipes 9, and a swirl plate 10 is provided in the flow guide pipe 9. The smoke hood 12 is provided with a smoke exhaust pipe 14, which can be connected to the smoke hood 12. The first end is provided with a methanol pump 1 and a burner 2 that are connected to each other, and a nozzle 3 is provided in the combustion chamber shell 5, and the nozzle 3 is connected to the burner 2. The conical guide cover 6 is provided with a plurality of guide holes 7, and the guide holes 7 are connected one-to-one with the guide pipe 9. The double-layer heat exchange box 8 is provided with a first water outlet 4 and a first water inlet 11, and the fin heat exchanger 17 is provided with a second water inlet 13 and a second water outlet 15.

[0018] The working principle of this application is:

[0019] Principle of combustion flue gas flow: methanol is pumped into the burner 2 through the methanol pump 1, and is ejected from the nozzle 3 after being pressurized. The atomized methanol ejected will be burned in the combustion chamber shell 5 after being ignited. The flue gas generated during combustion flows into the conduit 9 from the guide holes 7 distributed on the conical guide cover 6 under the action of the conical guide cover 6. Under the action of the swirl plate 10 installed in the guide pipe 9, the flow path of the flue gas is increased, and the heat exchange effect is enhanced. After the flue gas flows out of the swirl plate 10, it is collected in the smoke collecting hood 12, and then flows through the fin heat exchanger 17, and finally discharged into the atmosphere through the exhaust pipe 14.

[0020] The principle of heat exchange is: since the flame of methanol is relatively loose when it burns, the combustion chamber shell 5 will have a direct contact surface with the flame, generating a higher temperature. Without insulation, the outer wall of the combustion chamber will lose a lot of heat, resulting in low thermal efficiency. However, if thermal insulation cotton is used for insulation, the heat in the combustion chamber will accumulate. If the combustion chamber uses general materials, the inner wall will continue to oxidize and eventually be damaged under the action of high temperature. Therefore, the best solution is to take the heat away and use it. Therefore, this application designs a two-layer combustion chamber. The middle layer can be connected to the flowing water. The water flow participates in the heat exchange, which can solve the above problems. Specifically, the water first enters from the first water inlet 11 of the double-layer heat exchange box 8, flows in the double-layer heat exchange box 8, takes away the heat from the outer wall of the combustion chamber shell 5, and finally flows out from the first water outlet 4 of the double-layer heat exchange box 8, flows into the second water inlet 13 of the fin-type heat exchanger 17 and the flue gas coming out of the smoke hood 12 after passing through the connecting pipe 16, and then undergoes heat exchange once, and finally flows out from the second water outlet 15 of the fin-type heat exchanger 17, completing the entire heat exchange process of absorbing heat.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An efficient methanol combustion and heat exchange device, characterized in that: The invention comprises a double-layer heat exchange box (8) and a combustion chamber shell (5), a conical air guide cover (6) and a smoke collecting hood (12) arranged in the double-layer heat exchange box (8), wherein the combustion chamber shell (5) is located at the first end of the double-layer heat exchange box (8), the smoke collecting hood (12) is located at the second end of the double-layer heat exchange box (8), the air guide cover (6) is located between the first end and the second end, and the double-layer heat exchange box (8) is connected to the smoke collecting hood (12) via a connecting pipe (16), wherein when a fluid flows from the double-layer heat exchange box (8) to the smoke collecting hood (12), the fluid can sequentially exchange heat with the combustion chamber shell (5) and the smoke collecting hood (12).

2. The methanol combustion and heat exchange device according to claim 1, characterized in that: The connecting pipe (16) is connected to a fin-type heat exchanger (17), and the fin-type heat exchanger (17) is in contact with the smoke collecting hood (12).

3. The methanol combustion and heat exchange device according to claim 1, characterized in that: The conical air guide hood (6) is connected to the smoke collecting hood (12) via a plurality of air guide pipes (9), and a swirl sheet (10) is provided in the air guide pipe (9).

4. The methanol combustion and heat exchange device according to claim 3, characterized in that: The smoke collecting hood (12) is provided with a smoke exhaust pipe (14), and the smoke exhaust pipe (14) can be in communication with the smoke collecting hood (12).

5. The methanol combustion and heat exchange device according to claim 1, characterized in that: A methanol pump (1) and a burner (2) which are in communication with each other are arranged on the first end, a nozzle (3) is arranged in the combustion chamber housing (5), and the nozzle (3) is in communication with the burner (2).

6. The methanol combustion and heat exchange device according to claim 3, characterized in that: The conical flow guide cover (6) is provided with a plurality of flow guide holes (7), and the flow guide holes (7) are in one-to-one communication with the flow guide pipe (9).

7. The methanol combustion and heat exchange device according to claim 2, characterized in that: The double-layer heat exchange box (8) is provided with a first water outlet (4) and a first water inlet (11), and the fin-type heat exchanger (17) is provided with a second water inlet (13) and a second water outlet (15).

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