Furnace bottom heat accumulating type natural gas heating furnace

Abstract

A furnace bottom heat storage type natural gas heating furnace comprises a furnace body, an air supply unit and a gas supply unit, the furnace body comprises a hearth in the furnace body, the furnace body further comprises two heat storage units, and each heat storage unit comprises a mixing gas channel arranged in the furnace body and a heat storage chamber arranged on the lower side of the hearth. One end of the mixed gas channel is provided with a fire spraying opening communicated with the hearth, the other end of the mixed gas channel is communicated with the heat storage chambers, the bottoms of the heat storage chambers are connected with the air supply unit through air openings, the air supply unit is arranged to be capable of alternately supplying air to the two heat storage chambers, the air supply unit comprises a gas pipeline, and the gas pipeline is communicated with the mixed gas channel. And air can be alternately supplied to the mixed air passages of the two groups of heat storage units. Through repeated and alternate heat storage and exchange work of the heat storage chambers, the heat efficiency of the heating furnace is greatly improved, the temperature of the bottom of the hearth is increased due to the heat storage function of the heat storage chambers, and the heating uniformity in the hearth is 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 bottom heat storage type natural gas heating furnace. Background Art

[0002] In the metallurgical industry, a heating furnace is a device that heats materials or workpieces to the rolling and forging temperature. Heating furnaces are used in many industries such as petroleum, chemical industry, metallurgy, machinery, heat treatment, surface treatment, building materials, electronics, materials, light industry, daily chemicals, and pharmaceuticals. Heating furnaces, various industrial furnaces, and boilers are all high-energy-consuming kilns with large resource consumption. The temperature of the heating furnace when heating the material or workpiece is high, and the flue gas takes away a large amount of high-temperature heat, resulting in waste and low heat utilization. The regenerative combustion technology fundamentally improves the energy utilization of the heating furnace.

[0003] The patent document with application number CN202223287974.1 discloses a natural gas furnace with a wall heat storage chamber. By arranging heat storage chambers on both sides of the walls, the heat utilization rate is improved, energy is saved, and resource waste is reduced. However, in actual applications, it is found that although the arrangement of the heat storage chambers on both sides can effectively increase the temperature of the side walls of the furnace body, the temperature at the bottom of the furnace is still relatively low, which makes the furnace temperature uniformity not high. Even if heat insulation materials are arranged at the bottom of the furnace, the heating uniformity is still not guaranteed, which ultimately leads to certain limitations in the heating efficiency. Utility Model Content

[0004] In order to solve the technical problems of low energy utilization, low furnace bottom temperature and uneven furnace temperature in the above background technology, the utility model provides a furnace bottom heat storage type natural gas heating furnace.

[0005] The technical solution of this utility model is as follows:

[0006] A furnace bottom heat storage type natural gas heating furnace comprises a furnace body, an air supply unit and an air supply unit. The workpiece completes heating and combustion in the furnace body. The air supply unit provides fuel gas for combustion. The air supply unit provides combustion-supporting gas for combustion and removes excess smoke.

[0007] Specifically, the furnace body includes a furnace inside it, and the workpiece completes heating and combustion in the furnace. The furnace body also includes two groups of heat storage units, and the heat storage unit includes a mixing gas duct arranged inside the furnace body, and a heat storage chamber arranged at the lower side of the furnace. One end of the mixing gas duct is provided with a flame nozzle connected to the furnace, and the other end is connected to the heat storage chamber; the bottom of the heat storage chamber is connected to the air supply unit through an air port, and the air supply unit is configured to alternately supply air to the two heat storage chambers; the air supply unit includes a gas pipeline, which is connected to the mixing gas duct and is configured to alternately supply air to the mixing gas ducts of the two groups of heat storage units.

[0008] The heat storage unit includes a first heat storage unit and a second heat storage unit.

[0009] On the basis of the above structure, the air supply unit delivers the combustion-supporting gas to the heat storage chamber of the first heat storage unit through the air port, and enters the mixed gas duct of the first heat storage unit. At the same time, the air supply unit delivers the combustion-supporting gas to the mixed gas duct of the first heat storage unit, and mixes with the combustion-supporting gas to burn, and is ejected from the flame outlet of the first heat storage unit into the furnace to start calcining and heating the workpiece. At this time, the air supply mechanism provides the second heat storage unit with air induced and smoke exhaust work, and the high-temperature flue gas generated in the furnace is led out to the heat storage chamber of the second heat storage unit through the flame outlet of the second heat storage unit. The heat of the flue gas is absorbed by the heat storage chamber of the second heat storage unit, and the flue gas temperature is reduced and discharged from the air port.

[0010] After a certain period of time, the air supply unit is adjusted to deliver gas to the second heat storage unit, and the air supply unit is adjusted so that the air supply unit provides air supply for the second heat storage unit and provides ventilation and smoke exhaust for the first heat storage unit. The air supply unit delivers the combustion-supporting gas to the heat storage chamber of the second heat storage unit. The combustion-supporting gas is heated and heated immediately after passing through the heat storage chamber, so as to realize the heat recovery and utilization of the heat storage chamber. Subsequently, the heated combustion-supporting gas enters the mixed gas duct of the second heat storage unit and meets the gas and burns. It is ejected from the flame-spraying port of the second heat storage unit into the furnace, and the workpiece is started to be calcined and heated. The high-temperature flue gas generated by the combustion enters the mixed gas duct and the heat storage chamber of the second heat storage unit in turn. The heat storage chamber of the second heat storage unit begins to absorb the heat of the flue gas to complete the heat storage. The flue gas temperature decreases accordingly and is discharged from the air outlet.

[0011] The air supply unit and the wind supply unit work alternately, thereby realizing the heat storage and heat release work of the heat storage chamber, improving heat utilization rate, reducing energy consumption, and the bottom of the furnace is heated up due to the heat storage function of the heat storage chamber, and the heating uniformity in the furnace is improved.

[0012] Furthermore, the two groups of heat storage units are symmetrically arranged to enhance the uniformity of the temperature in the furnace and facilitate the manufacture and installation of the furnace body.

[0013] Preferably, a heat insulation wall is provided between the two heat storage chambers to reduce heat exchange between the two heat storage chambers and avoid affecting the working conditions of both parties.

[0014] Specifically, the heat storage chamber includes a chamber and a heat storage body which are arranged in sequence up and down and communicate with the mixed gas channel, and the heat of the exhaust flue gas is stored in the heat storage body to ensure the temperature of the bottom of the furnace.

[0015] As a preferred embodiment, the gas pipeline includes two groups, and is respectively connected to the mixed gas passages of the two groups of heat storage units, and a control valve is provided at one end of the two groups of gas pipelines, and the alternating gas supply to the mixed gas passage is achieved by switching the control valve.

[0016] Furthermore, the air supply unit includes an air supply assembly and a fan disposed on the top of the furnace body;

[0017] The air supply component includes two air ducts respectively connected to the air outlets of the two heat storage chambers. The fan is connected to the two air ducts through a four-way valve, and the air supply or air induction work in the air duct is achieved through the reversing operation of the four-way valve.

[0018] As a preferred embodiment, a steel grate is provided at the air outlet, the steel grate can support the heat storage body to prevent it from falling and blocking the air outlet, and the combustion-supporting gas can pass through the steel grate into the heat storage unit.

[0019] Through the above design, the utility model sets a heat storage chamber at the bottom of the furnace, and provides combustion-supporting air for the heat storage chamber through an air supply unit. The combustion-supporting air and natural gas fuel are burned in the mixed air duct and sprayed into the furnace. The high-temperature flue gas generated by the combustion of the workpiece is discharged to the heat storage chamber by the air supply unit. The temperature of the heat storage body is increased by the discharged high-temperature flue gas, and the temperature of the high-temperature flue gas is reduced and discharged after passing through the heat storage body. Subsequently, the cold air introduced is passed through the heat storage body for heating through the reversing air supply work, thereby realizing the recovery and utilization of the heat of the heat storage body and reducing energy consumption. In addition, the bottom of the furnace is heated due to the heat storage function of the heat storage chamber, the heating uniformity in the furnace is improved, and the thermal efficiency of the heating furnace is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the attached picture:

[0021] Figure 1 It is a front cross-sectional view of the structure of the heating furnace in the embodiment;

[0022] Figure 2 It is a structural side sectional view of the heating furnace in the embodiment;

[0023] Figure 3 It is a top sectional view of the structure of the heating furnace in the embodiment;

[0024] The components represented by the reference numerals in the figure are:

[0025] 1. Furnace body; 11. Furnace; 12. Mixing gas duct; 13. Regenerator; 131. Chamber; 132. Regenerator; 14. Flame-spraying port; 15. Air outlet; 16. Steel grate; 2. Air supply unit; 21. Air duct; 22. Four-way valve; 3. Air supply unit; 31. Gas pipeline. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0027] Example

[0028] The present embodiment provides a furnace bottom heat storage type natural gas heating furnace, including a furnace body 1, an air supply unit 2 and an air supply unit 3. The workpiece is heated and burned in the furnace body. The air supply unit provides fuel gas for combustion. The air supply unit provides combustion-supporting gas for combustion and removes excess smoke. The structure of the heating furnace (the above-mentioned furnace bottom heat storage type natural gas heating furnace) is described in detail below.

[0029] In this embodiment, the furnace body 1 includes a furnace 11 inside thereof, and the workpiece is heated and burned in the furnace 11. The furnace body 1 also includes two groups of heat storage units, and the heat storage unit includes a mixed gas duct 12 arranged inside the furnace body 1, and a heat storage chamber 13 arranged at the lower side of the furnace 11. One end of the mixed gas duct 12 is provided with a flame vent 14 connected to the furnace 11, and the other end is connected to the heat storage chamber 13; the bottom of the heat storage chamber 13 is connected to the air supply unit 2 through the air port 15, and the air supply unit 2 is configured to alternately supply air to the two heat storage chambers 13;

[0030] The gas supply unit 3 includes a gas pipeline 31 , which is in communication with the mixed gas passage 12 and is configured to alternately supply gas to the mixed gas passages 12 of the two groups of heat storage units.

[0031] The heat storage unit includes a first heat storage unit and a second heat storage unit.

[0032] On the basis of the above structure, the air supply unit 2 delivers the combustion-supporting gas to the heat storage chamber 13 of the first heat storage unit through the air port 15, and enters the mixed gas duct 12 of the first heat storage unit. At the same time, the air supply unit 3 delivers the combustion-supporting gas to the mixed gas duct 12 of the first heat storage unit, and mixes with the combustion-supporting gas to burn, and is ejected from the flame outlet 14 of the first heat storage unit into the furnace 11, and the workpiece begins to be calcined and heated. At this time, the air supply mechanism provides the second heat storage unit with air induced exhaust and smoke exhaust work. The high-temperature flue gas generated in the furnace 11 is drawn out to the heat storage chamber 13 of the second heat storage unit through the flame outlet 14 of the second heat storage unit. The heat of the flue gas is absorbed by the heat storage chamber 13 of the second heat storage unit, and the flue gas temperature is reduced accordingly and discharged from the air port 15.

[0033] After a certain period of time, the air supply unit 3 is adjusted to deliver gas to the second heat storage unit, and the air supply unit 2 is adjusted so that the air supply unit 2 provides air supply for the second heat storage unit and provides ventilation and smoke exhaust for the first heat storage unit. The air supply unit 2 delivers the combustion-supporting gas to the heat storage chamber 13 of the second heat storage unit. The combustion-supporting gas is heated and heated immediately after passing through the heat storage chamber 13, so that the heat of the heat storage chamber 13 is recovered and utilized. Then, the heated combustion-supporting gas enters the mixed gas passage 12 of the second heat storage unit and meets the gas and burns. It is ejected from the flame outlet 14 of the second heat storage unit into the furnace 11, and the workpiece is started to be calcined and heated. The high-temperature flue gas generated by the combustion enters the mixed gas passage 12 and the heat storage chamber 13 of the second heat storage unit in turn. The heat storage chamber 13 of the second heat storage unit begins to absorb the heat of the flue gas to complete the heat storage. The flue gas temperature decreases accordingly and is discharged from the air outlet 15.

[0034] The air supply unit 2 and the air supply unit 3 work alternately, thereby realizing the heat storage and heat release work of the heat storage chamber 13, improving heat utilization, reducing energy consumption, and the bottom of the furnace 11 is heated due to the heat storage function of the heat storage chamber 13, and the heating uniformity in the furnace 11 is improved.

[0035] Specifically, the furnace body 1 further includes a furnace top and a furnace bottom arranged above and below the furnace 11 , and a furnace wall arranged on the side of the furnace 11 . The furnace top, furnace bottom and furnace wall wrap the furnace 11 to reduce temperature loss in the furnace 11 .

[0036] Furthermore, the two groups of heat storage units are symmetrically arranged to enhance the uniformity of the temperature in the furnace and facilitate the manufacture and installation of the furnace body 1.

[0037] As a preferred embodiment, the mixing gas ducts 12 of the two groups of heat storage units are arranged in the furnace wall, and a plurality of them are arranged along the long side direction of the furnace 11, and one end of each of them is connected to the heat storage chamber, and the other end of each of them is provided with a flame nozzle 14.

[0038] Furthermore, the flame-spraying port 14 is located on the furnace wall and sprays fire laterally into the furnace 11 .

[0039] Preferably, a heat insulation wall is provided between the two heat storage chambers 13 to reduce the heat exchange between the two heat storage chambers 13 and avoid affecting the working conditions of both parties.

[0040] Specifically speaking of the structure of the heat storage chamber 13, the heat storage chamber 13 includes a chamber 131 and a heat storage body 132 which are arranged in sequence from top to bottom and communicate with the mixing gas channel 12. The heat of the exhaust flue gas is stored in the heat storage body 132 to ensure the bottom temperature of the furnace 11.

[0041] As a preferred embodiment, the gas pipeline 31 includes two groups, and is respectively connected to the mixed gas passages 12 of the two groups of heat storage units, and a control valve is provided at one end of the two groups of gas pipelines 31, and alternating gas supply to the mixed gas passage 12 is achieved by switching the control valve.

[0042] Preferably, the two groups of gas pipelines 31 pass through the furnace top and the furnace wall in sequence to communicate with the mixed gas channel 12, and each group of gas pipelines is provided with a plurality of gas pipelines along the furnace wall.

[0043] Furthermore, the air supply unit 2 includes an air supply assembly and a fan disposed on the top of the furnace body 1;

[0044] The air supply component includes two air ducts 21 respectively connected to the air outlets 15 of the two heat storage chambers 13. The fan is connected to the two air ducts 21 through a four-way valve 22. The four-way valve 22 is switched to realize air supply or air induction in the air ducts 21. The fan includes a blower and an induced draft fan, which respectively perform air supply and air induction.

[0045] As a preferred embodiment, a steel grate is provided at the air outlet 15, and the steel grate can support the heat storage body 132 to prevent it from falling and blocking the air outlet 15, and the combustion-supporting gas can pass through the steel grate into the heat storage unit.

[0046] The specific working principle of this embodiment is as follows:

[0047] like Figure 1 , adjust the direction of the four-way valve, connect the air duct connected to the first heat storage unit with the blower for air supply, connect the air duct connected to the second heat storage unit with the induced draft fan for induced draft and smoke exhaust, and the combustion-supporting gas is sent to the lower air outlet of the heat storage chamber of the first heat storage unit through the air duct, passes through the steel grate and enters the mixed gas duct of the first heat storage unit after passing through the heat storage chamber. At the same time, the air supply unit transports the fuel gas to the mixed gas duct of the first heat storage unit, and the fuel gas and the supporting gas begin to burn and are ejected from the flame outlet of the first heat storage unit into the furnace, and the workpiece begins to be calcined and heated. The high-temperature flue gas generated is led to the mixed gas duct of the second heat storage unit through the flame outlet of the second heat storage unit. At this time, the high-temperature flue gas can heat the furnace wall, and the high-temperature flue gas continues to be led to the heat storage chamber of the second heat storage unit, and the heat of the flue gas is absorbed by the heat storage body in the heat storage chamber, and the flue gas temperature decreases accordingly and is discharged from the right air outlet.

[0048] When the temperature of the heat storage chamber of the second heat storage unit reaches the limit value, the direction of the four-way valve is changed, the air supply unit is adjusted to supply gas to the second heat storage unit, and the air supply unit is adjusted so that the air supply unit provides air supply for the second heat storage unit and provides ventilation and smoke exhaust for the first heat storage unit. The combustion-supporting gas is sent to the heat storage chamber of the second heat storage unit, and the cold air passes through the high-temperature heat storage body to heat it, thereby realizing the recovery and utilization of the heat of the heat storage body. The heated combustion-supporting gas enters the mixed gas duct of the second heat storage unit and meets the gas and burns, and is ejected from the flame-spraying port of the second heat storage unit into the furnace. At this time, the high-temperature flue gas generated is led out to the mixed gas duct of the first heat storage unit through the flame-spraying port of the first heat storage unit, thereby increasing the temperature of the furnace wall, and then enters the heat storage chamber of the first heat storage unit. The heat of the flue gas is absorbed by the heat storage body in the heat storage chamber, and the flue gas temperature decreases accordingly and is discharged from the left air outlet.

[0049] After repeated alternating heat storage and heat exchange, the thermal efficiency of the heating furnace has been greatly improved, and the bottom of the furnace is heated up due to the heat storage function of the heat storage chamber, and the heating uniformity in the furnace is improved.

Claims

1. A furnace bottom heat storage type natural gas heating furnace, characterized in that: It comprises a furnace body (1), an air supply unit (2) and an air supply unit (3); The furnace body (1) comprises a furnace chamber (11) therein; The furnace body (1) further comprises two groups of heat storage units, the heat storage units comprising a mixed gas passage (12) arranged inside the furnace body, and a heat storage chamber (13) arranged below the furnace (11); one end of the mixed gas passage (12) is provided with a flame ejection port (14) communicating with the furnace (11), and the other end is communicated with the heat storage chamber (13); The bottom of the heat storage chamber is connected to an air supply unit (2) via an air outlet (15), and the air supply unit is configured to supply air alternately to the two heat storage chambers (13); The gas supply unit (3) comprises a gas pipeline (31), the gas pipeline (31) being in communication with the mixed gas passage (12) and being configured to alternately supply gas to the mixed gas passages (12) of the two groups of heat storage units.

2. The bottom heat storage natural gas heating furnace according to claim 1, characterized in that: The two groups of heat storage units are symmetrically arranged.

3. The bottom heat storage natural gas heating furnace according to claim 1, characterized in that: A heat insulation wall is also provided between the two heat storage chambers (13).

4. The bottom heat storage natural gas heating furnace according to claim 1, characterized in that: The heat storage chamber (13) comprises a chamber (131) and a heat storage body (132) arranged vertically and communicating with the mixed gas passage (12).

5. The bottom heat storage natural gas heating furnace according to claim 1, characterized in that: The gas pipeline (31) comprises two groups, and is respectively connected to the mixed gas passages (12) of the two groups of heat storage units, and the two groups of gas pipelines (31) are both provided with control valves.

6. The furnace bottom heat storage type natural gas heating furnace according to claim 1, characterized in that: The air supply unit (2) comprises an air supply component and a fan arranged on the top of the furnace body (1); The air supply component comprises two air ducts (21) respectively connected to the air outlets (15) of the two heat storage chambers, and the fan is connected to the two air ducts (21) via a four-way valve (22).

7. The bottom heat storage natural gas heating furnace according to claim 1, characterized in that: A steel grate (16) is provided at the air outlet (15).

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