Furnace top heat accumulating type natural gas heating furnace

Abstract

A furnace top heat accumulating type natural gas heating furnace comprises a furnace body, a fuel gas set and a fan set, a hearth is arranged in the furnace body, the furnace body further comprises two heat accumulating sets, each heat accumulating set comprises a flame path arranged in the furnace body and a heat accumulating cavity arranged above the hearth, one end of each flame path is provided with a flame spraying opening communicated with the top of the hearth, and the other end of each flame path is provided with a heat accumulating cavity communicated with the top of the hearth. The fire spraying opening is formed in the top of the hearth and is not prone to being blocked, cleanliness and smoothness of the fire spraying opening can be guaranteed, the other end of the flame path is communicated with the bottom of the heat storage cavity, the top of the heat storage cavity is connected with the fan set, the gas set comprises two gas pipes, opening and closing of the gas pipes can be independently controlled, and the gas pipes are communicated with the flame path. Through alternate reversing work of the fan set and the gas set, alternate heat storage and heat release of the heat storage set are achieved, the hearth temperature rising speed is high, the energy utilization rate is greatly improved, energy consumption is reduced, meanwhile, the furnace top temperature is guaranteed, and the furnace bottom and the furnace wall are provided with fire-resistant heat preservation layers so that heat loss can be reduced, and the temperature uniformity in the hearth can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat storage type combustion heating furnaces, in particular to a furnace top heat storage type natural gas heating furnace. Background Art

[0002] The regenerative heating furnace is a common heating equipment used for hot processing of workpieces. The patent document with application number CN202221365670.X previously applied by the applicant discloses a wall regenerative double-layer side spray burner, which improves energy utilization and reduces energy consumption by setting a regenerative chamber on both sides of the wall. However, its flame nozzle is set on the side wall of the furnace, which makes it difficult to ensure the cleanliness and smoothness of the flame nozzle. Moreover, its regenerative chamber is set on the walls on both sides of the furnace. Although a refractory layer and a thermal insulation layer are set on the top, the temperature of the bottom of the furnace is difficult to guarantee, which leads to heat loss in the upper and lower parts of the furnace and uneven temperature in the furnace. Utility Model Content

[0003] In order to solve the technical problems in the above background technology that the flame nozzle is easy to be blocked, the heat is lost in the upper and lower positions of the furnace, and the temperature in the furnace is uneven, the utility model provides a furnace top heat storage type natural gas heating furnace.

[0004] The technical solution of this utility model is as follows:

[0005] A furnace top regenerative natural gas heating furnace comprises a furnace body, a gas group and a fan group. The furnace body provides a space for heating materials or workpieces, the gas group transports fuel to the furnace body, and the fan group can transport combustion-supporting air to the furnace body and exhaust smoke generated by combustion.

[0006] As the core technical concept of the utility model, a furnace is provided inside the furnace body, and the furnace is a space surrounded by furnace walls for fuel combustion; the furnace body also includes two heat storage groups, and the heat storage group includes a fire channel arranged inside the furnace body, and a heat storage chamber arranged above the furnace, and the two heat storage chambers can alternately store heat or release heat. One end of the fire channel is provided with a flamethrower connected to the top of the furnace, and the other end is connected to the bottom of the heat storage chamber. The top of the heat storage chamber is connected to the fan group, and the fan group can alternately supply air to the heat storage group. The flamethrower is arranged at the top of the furnace, which is not easy to be blocked, and can ensure that the flamethrower is clean and smooth; the gas group includes two groups of gas pipes that can independently control switches, and the gas pipes are connected to the fire channel and can alternately supply air to the fire channel.

[0007] As for one of the usage modes of the heating furnace, the heat storage group includes a first heat storage group and a second heat storage group. Based on the above structure, the fan group supplies air to the heat storage chamber of the first heat storage group until it reaches the fire channel of the first heat storage group. At the same time, the gas group supplies gas to the fire channel of the first heat storage group. The gas burns in the fire channel and sprays the flame downward into the furnace through the flame outlet of the first heat storage group to start heating the material. At this time, the fan group provides draft work for the second heat storage group. The high-temperature flue gas generated in the furnace is drawn out from the flame outlet of the second heat storage group, and enters the heat storage chamber of the second heat storage group through the fire channel of the second heat storage group. The heat storage chamber absorbs the heat of the flue gas and stores it in the heat storage chamber. The flue gas temperature drops accordingly and is discharged from the furnace body under the action of the fan group.

[0008] After the temperature in the heat storage chamber of the second heat storage group reaches the limit value, the fan group and the gas group are adjusted. The fan group supplies air to the second heat storage group, and the gas group provides gas to the second heat storage group. The temperature of the air increases when passing through the heat storage chamber of the second heat storage group, meets the gas in the fire channel of the second heat storage group and starts to burn. The generated flame is sprayed into the furnace through the flame outlet of the second heat storage group. The flue gas generated at this time is led into the heat storage chamber of the first heat storage group through the flame outlet and fire channel of the first heat storage group. The heat storage chamber absorbs and stores the heat of the flue gas, and the flue gas is discharged immediately after cooling down.

[0009] Through the alternating rotation of the fan group and the gas group, the heat storage and release of the heat storage chamber is realized, the furnace temperature rises quickly, the energy utilization rate is greatly improved, and the energy consumption is significantly reduced.

[0010] Furthermore, the two heat storage groups are symmetrically arranged to improve the uniformity of combustion and the efficiency of manufacturing and installing the heating furnace.

[0011] As a preferred embodiment, a refractory insulation layer is provided at the bottom of the furnace to reduce the temperature loss at the bottom of the furnace.

[0012] Preferably, the two heat storage chambers are arranged opposite to each other, and a partition wall is provided between the two heat storage chambers, so as to avoid interference between the two heat storage chambers.

[0013] Further preferably, the middle portion of the heat storage chamber is filled with heat storage balls, which can alternately store and release heat.

[0014] As a preferred embodiment, a brick grate is provided between the heat storage ball and the bottom of the heat storage chamber to prevent the heat storage ball from falling while allowing air or smoke to pass smoothly.

[0015] Furthermore, the fan unit includes a four-way valve capable of controlling the air supply direction and an air duct connected to the four-way valve, and the switching between air supply and air induction can be achieved by controlling the four-way valve.

[0016] Preferably, a plurality of the fire channels are arranged along the length direction of the furnace, and each fire channel has a corresponding flame outlet, thereby increasing the number of the flame outlets at the top of the furnace and the radiation area of ​​the flame.

[0017] Through the above design, the beneficial effects of the utility model are:

[0018] (1) The utility model sets a heat storage chamber on the furnace top, and sets a fan group to provide air supply and smoke exhaust, and sets a gas group to provide gas. Air enters the fire channel through the air duct and the heat storage chamber, and the gas and combustion-supporting air burn in the fire channel and are sprayed into the furnace through the flame nozzle on the top of the furnace. The high-temperature flue gas generated by the combustion in the furnace is exhausted by the fan group. When passing through the heat storage chamber, the heat of the flue gas is absorbed by the heat storage chamber, and the heat storage chamber completes the heat storage work. After a certain period of time, the air supply is reversed, and the cold air is transported through the heat storage chamber that has completed the heat storage. The air is heated and the heat storage chamber completes the heat release work. In this way, the heat storage and heat release work is alternately performed for multiple times, the furnace temperature rises quickly, and the energy utilization rate is greatly improved.

[0019] (2) The heat storage capacity of the heat storage chamber can effectively guarantee the furnace top temperature and avoid heat loss at the top of the furnace. The temperature of the heat storage chamber is low at the top and high at the bottom. It only needs to set a cover plate at the top of the heat storage chamber without adding a refractory insulation layer. A refractory insulation layer is set at the bottom of the furnace to reduce heat loss and improve the uniformity of the furnace temperature.

[0020] (3) The blast nozzle is set at the top of the furnace. This top spraying method can not only effectively prevent the blast nozzle from being blocked, but also has a good effect of heat radiation convection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the attached picture:

[0022] Figure 1 It is a front cross-sectional view of the structure of the heating furnace in the embodiment;

[0023] Figure 2 It is a structural side sectional view of the heating furnace in the embodiment;

[0024] Figure 3 It is a top sectional view of the structure of the heating furnace in the embodiment;

[0025] The components represented by the reference numerals in the figure are:

[0026] 1. Furnace body; 11. Furnace chamber; 12. Fire channel; 13. Heat storage chamber; 131. Heat storage ball; 132. Air inlet; 133. Inlet and outlet chamber; 14. Flame outlet; 15. Partition wall; 2. Gas group; 21. Gas pipe; 3. Fan group; 31. Four-way valve; 32. Air duct. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0028] Example

[0029] This embodiment provides a furnace top regenerative natural gas heating furnace, comprising a furnace body 1, a gas group 2 and a fan group 3. The furnace body 1 provides a space for heating materials or workpieces, the gas group 2 delivers fuel to the furnace body 1, and the fan group 3 can deliver combustion air to the furnace body 1 and exhaust smoke generated by combustion. The structure of the heating furnace (the above-mentioned furnace bottom regenerative natural gas heating furnace) is described in detail below.

[0030] In this embodiment, a furnace 11 is provided inside the furnace body 1. The furnace 11 is a space surrounded by furnace walls for fuel combustion, providing mixing conditions and sufficient residence time required for the ignition and combustion of the fuel.

[0031] As a preferred embodiment, a refractory insulation layer is provided at the bottom of the furnace 11 to reduce the temperature loss at the bottom of the furnace 11 .

[0032] Furthermore, the walls on both sides of the furnace 11 are also provided with a refractory insulation layer to reduce the heat loss of the walls and ensure the outer surface temperature of the furnace body.

[0033] The furnace body 1 also includes two heat storage groups, which are symmetrically arranged to improve the uniformity of combustion and facilitate the manufacture and installation of the heating furnace. The heat storage groups include a first heat storage group and a second heat storage group.

[0034] Specifically, the heat storage group also includes a fire channel 12 arranged inside the furnace body 1, and a heat storage chamber 13 arranged above the furnace 11. The heat storage chamber 13 can alternately store heat or release heat. One end of the fire channel 12 is provided with a flamethrower 14 connected to the top of the furnace 11, and the other end is connected to the bottom of the heat storage chamber 13. The flamethrower 14 is arranged at the top of the furnace 11, is not easy to be blocked, and can ensure that the flamethrower 14 is clean and smooth.

[0035] Furthermore, a plurality of fire channels 12 are provided along the length direction of the furnace 11 , and each fire channel 12 has a corresponding flame emitting port 14 , thereby increasing the number of the flame emitting ports 14 at the top of the furnace 11 and the radiation area of ​​the flame.

[0036] Preferably, the two heat storage chambers 13 are arranged opposite to each other, and a partition wall 15 is provided between the two heat storage chambers 13 to avoid interference between the two heat storage chambers 13 .

[0037] Furthermore, a cover plate is provided at the top of the heat storage chamber 13 to ensure that the top of the furnace body is a complete plane, and the temperature of the heat storage chamber is lower at the top and higher at the bottom, so the temperature of the top of the furnace body is relatively low, and there is no need to add a refractory insulation layer.

[0038] Further preferably, the middle of the heat storage chamber 13 is filled with heat storage balls 131, which can alternately store and release heat.

[0039] As a preferred embodiment, a brick grate is provided between the heat storage ball 131 and the bottom of the heat storage chamber 13, so as to ensure that the heat storage ball 131 does not fall and allow air or smoke to pass smoothly.

[0040] In this embodiment, the gas group 2 includes two groups of gas pipes 21 that can be independently controlled to be switched on and off. The gas pipes 21 are connected to the fire channel 12 and can alternately supply gas to the fire channel 12 .

[0041] In this embodiment, the fan unit 3 is arranged above the furnace body, the top of the heat storage chamber 13 is connected to the fan unit 3, and the fan unit 3 can alternately supply air to the heat storage group.

[0042] Specifically, the fan unit 3 includes a four-way valve 31 capable of controlling the air supply direction and an air duct 32 connected to the four-way valve 31 . The switching between air supply and air induction can be achieved by controlling the four-way valve 31 .

[0043] As a preferred embodiment, an air inlet 132 is provided above the heat storage chamber 13 and connected to the air duct 32 for the intake and exhaust of air or smoke, and the air inlet 132 is conveniently connected to the fan unit 3, fewer air ducts 32 are required, the structure is compact, and the cost is reduced.

[0044] In this embodiment, one of the working principles of the heating furnace is:

[0045] The fan unit 3 is set to supply air to the heat storage chamber 13 of the first heat storage group, and the fan unit 3 is used to draw air for the second heat storage group. The air is sent to the fire channel 12 of the first heat storage group through the air duct 32, and the gas unit 2 delivers gas to the fire channel 12 of the first heat storage group. The gas burns in the fire channel, and the flame is sprayed downward into the furnace 11 through the flame-spraying port 14 of the first heat storage group to start heating the material; at this time, the high-temperature flue gas generated in the furnace 11 is drawn out from the flame-spraying port 14 of the second heat storage group, and enters the heat storage chamber 13 of the second heat storage group through the fire channel 12 of the second heat storage group. The heat storage chamber 13 absorbs the heat of the flue gas and stores it in the heat storage chamber 13. The flue gas temperature drops accordingly and is discharged from the furnace body 1 through the air inlet of the second heat storage group under the action of the fan unit 3.

[0046] After the temperature in the heat storage chamber 13 of the second heat storage group reaches the limit value, the four-way valve 31 and the gas group 2 are adjusted, the fan group 3 supplies air to the second heat storage group, and the gas group 2 provides gas to the second heat storage group. The air is sent to the second heat storage group through the air duct 32. The temperature increases when passing through the heat storage chamber 13 of the second heat storage group, thereby realizing the recovery and utilization of the heat of the second heat storage group. Subsequently, the air meets the gas in the fire channel 12 of the second heat storage group and starts to burn. The generated flame is sprayed into the furnace 11 through the flame outlet 14 of the second heat storage group. At this time, the smoke generated is led into the heat storage chamber 13 of the first heat storage group through the flame outlet 14 and the fire channel 12 of the first heat storage group. Its heat storage chamber 13 absorbs and stores the heat of the smoke, and the smoke is discharged immediately after cooling down.

[0047] The heat of flue gas is absorbed by the heat storage chamber, and the heat storage chamber completes the heat storage work. After the air supply is reversed, the transported cold air passes through the heat storage chamber that has completed the heat storage, and the air is heated and the heat storage chamber completes the heat release work. The heat storage and heat release work is performed alternately for many times, and the furnace heats up quickly, the energy utilization rate is greatly improved, the furnace top temperature is guaranteed and not easy to dissipate, and the furnace wall and furnace bottom are kept at temperature by a refractory insulation layer, which improves the uniformity of heating in the furnace.

Claims

1. A furnace top regenerative natural gas heating furnace, characterized in that: It comprises a furnace body (1), a gas unit (2) and a fan unit (3); A furnace (11) is provided inside the furnace body (1); The furnace body (1) further comprises two heat storage groups, the heat storage groups comprising a fire channel (12) arranged inside the furnace body (1) and a heat storage chamber (13) arranged above the furnace (11); one end of the fire channel (12) is provided with a flame ejection port (14) communicating with the top of the furnace (11), and the other end is communicated with the bottom of the heat storage chamber (13); the top of the heat storage chamber (13) is connected to a fan unit (3); The gas group (2) comprises two groups of gas pipes (21) capable of independently controlling switches, and the gas pipes (21) are in communication with the fire channel (12).

2. A furnace top regenerative natural gas heating furnace according to claim 1, characterized in that: The two heat storage groups are symmetrically arranged.

3. The furnace top regenerative natural gas heating furnace according to claim 1, characterized in that: The bottom of the furnace (11) is provided with a fire-resistant insulation layer.

4. The furnace top regenerative natural gas heating furnace according to claim 1, characterized in that: The two heat storage chambers (13) are arranged opposite to each other, and a partition wall (15) is provided between the two heat storage chambers (13).

5. The furnace top regenerative natural gas heating furnace according to claim 1, characterized in that: The middle part of the heat storage chamber (13) is filled with heat storage balls (131).

6. The furnace top regenerative natural gas heating furnace according to claim 5, characterized in that: A brick grate is provided between the heat storage ball (131) and the bottom of the heat storage chamber (13).

7. The furnace top regenerative natural gas heating furnace according to claim 1, characterized in that: The fan unit (3) comprises a four-way valve (31) capable of controlling the air supply direction and an air duct (32) connected to the four-way valve (31).

8. The furnace top regenerative natural gas heating furnace according to claim 1, characterized in that: A plurality of fire channels (12) are arranged along the length direction of the furnace (11).

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