Low-heating-value fuel gas double-preheating heat accumulating type combustor

Abstract

The utility model provides a low-heating-value fuel gas double-preheating heat accumulating type combustor, which belongs to the technical field of combustors and comprises a communicating box body and a main box body. The communicating box body comprises two groups of ventilation units, and the two groups of ventilation units are respectively connected with two air inlet / outlet ends of the main box body; each group of ventilation units and the air inlet / outlet end of the main box body form a cavity, a partition plate is arranged in the cavity, and the cavity is divided into an air heat storage channel and a fuel gas heat storage channel by the partition plate; and heat storage bodies are arranged in the air heat storage channel and the fuel gas heat storage channel. The air heat storage channel and the fuel gas heat storage channel are arranged, and heat storage bodies are arranged in the air heat storage channel and the fuel gas heat storage channel, so that independent heat storage and heat release of low-heating-value fuel gas and air are achieved; smoke return ports in the two sides of the main box body are connected with smoke outlets in the two sides of the m-shaped radiant tube, and a flame outlet is connected with a smoke inlet of the m-shaped radiant tube, so that smoke self-circulation backflow is achieved, and the flame position is fixed.

Description

Technical Field

[0001] The utility model belongs to the technical field of burners, and in particular relates to a low calorific value gas double preheating heat storage burner. Background Art

[0002] In the field of low calorific value gas regenerative combustion, most of the double preheating regenerative burners with split-box structure are currently used, which are equipped with four independent gas and air interface devices, two by two, and are arranged on both sides of the furnace body, so the volume is relatively large and more raw materials are used. Moreover, there is no premixing and combustion space inside, and directly passing air and gas into the furnace will cause poor low-temperature combustion.

[0003] Therefore, before carrying out heat storage combustion, another burner is needed to raise the temperature in the furnace to a higher temperature before starting heat storage combustion. The external installation space is more complicated, and it is not easy to fix the flame combustion position in areas with higher requirements for flame arrangement. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a low calorific value gas double preheating heat storage burner. The technical problem to be solved by the utility model is how to achieve the heat storage of low calorific value gas and the fixation of flame combustion position while reducing space volume occupancy and material usage.

[0005] In order to solve the above technical problems, the utility model provides a low calorific value gas double preheating regenerative burner, comprising a connecting box body and a main box body;

[0006] The connecting box includes two sets of ventilation units, and the two sets of ventilation units are respectively connected to the two inlet / exhaust ends of the main box;

[0007] Each set of ventilation units and the inlet / exhaust end of the main box form a cavity, and a partition is arranged inside the cavity, which divides the cavity into an air heat storage channel and a gas heat storage channel; heat storage bodies are arranged inside the air heat storage channel and the gas heat storage channel, realizing independent heat storage and heat release of low calorific value gas and air.

[0008] Furthermore, the partition includes a ventilation box partition and a main box partition, the ventilation box partition is connected to the inner wall of the ventilation box, the main box partition is connected to the inner wall of the main box, and the lower surface of the ventilation box partition is against the upper surface of the main box partition.

[0009] Furthermore, the lower end of the ventilation box partition is connected to the heat storage baffle arranged inside the main box. The air and gas after heat storage in the air heat storage channel and the gas heat storage channel are evenly distributed through the heat storage baffle and enter the premixing chamber, so that the gas and air are fully mixed.

[0010] Furthermore, a premixing chamber is symmetrically arranged inside the main box, and the premixing chamber is arranged below the air heat storage channel and the gas heat storage channel.

[0011] Furthermore, the interior of the main box is symmetrically provided with a nozzle and a mixed combustion zone, the nozzle is provided in front of the premixing chamber, the mixed combustion zone is provided in front of the nozzle, and a flame outlet is provided at the intersection of the mixed combustion zones; the interior of the main box is symmetrically provided with a smoke return port, the smoke return port is provided between the nozzle and the mixed combustion zone, and is connected to the nozzle and the mixed combustion zone.

[0012] Furthermore, a smoke return pipe is connected to the smoke return port.

[0013] Furthermore, one end of the main box is connected to a radiation tube, and the radiation tube is an "M"-shaped structure.

[0014] Furthermore, the main box body is symmetrically provided with smoke return ports, one end of the main box body is provided with a flame outlet, the smoke outlets on both sides of the radiation tube are connected to the smoke return ports on both sides of the main box body, and the smoke inlet in the middle of the radiation tube is connected to the flame outlet. The smoke enters from the middle of the radiation tube, and then enters the main box body from the smoke outlets on both sides of the radiation tube; after the smoke on one side of the radiation tube enters the main box body, it is sucked into the jet ejected from the nozzle, and the smoke is mixed with the fuel gas and air to perform low-oxygen combustion, reducing NO x The flue gas discharged from the other side of the radiation tube enters the main box and is drawn out from the ventilation unit on that side by the induced draft fan, realizing the heat storage of the heat storage body in the ventilation unit;

[0015] Furthermore, both ventilation units are provided with air interfaces and gas interfaces, which are connected to the air heat storage channel and the gas heat storage channel respectively.

[0016] Furthermore, when in use, one set of ventilation units is connected to an induced draft fan, and the two sets of ventilation units discharge smoke and inhale air alternately.

[0017] The utility model discloses a low calorific value gas double preheating heat storage burner, by arranging two groups of ventilation units, each group of ventilation units and the inlet / exhaust end of the main box form a cavity, the interior of the cavity is provided with a partition, the partition separates the cavity into an air heat storage channel and a gas heat storage channel, the air heat storage channel and the gas heat storage channel are both provided with heat storage bodies, so that the low calorific value gas and air are independently stored and released; the two gas heat storage channels and the two air heat storage channels are integrated on the two ventilation units (the prior art is four ventilation units), and the two ventilation units are arranged on the furnace body. On one side, the volume of the burner is reduced and materials are saved; by setting the low calorific value gas double preheating regenerative burner into an axisymmetric structure, and connecting the smoke return ports on both sides with the smoke outlets on both sides of the "M"-shaped radiation tube, and connecting the flame outlet with the smoke inlet of the "M"-shaped radiation tube, the self-circulation reflux of the smoke is realized, and the flame position is also fixed. Compared with the existing technology, the volume of the burner is reduced and materials are saved; the smoke inhaled from the smoke return port is mixed with air and gas to reduce the oxygen content in the air, realize low-oxygen combustion, and reduce NO x The flame gas volume is expanded, and a flame speed with a certain rigidity is formed at the flame outlet to increase the air flow disturbance in the furnace and improve the uniformity of furnace temperature. At the same time, the flame speed with a certain rigidity can be unaffected by the negative pressure of smoke exhaust on the other side. By setting up a premixing chamber and a mixed combustion zone, the heat-storing gas and air are evenly mixed and ignited, which improves the low-temperature combustibility. After the air and gas are heat-stored and mixed, they are directly ignited in the mixed combustion zone. There is no need to use an additional burner to raise the temperature in the furnace to a higher temperature before starting the heat storage combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a cross-sectional schematic diagram of a low calorific value gas double preheating heat storage burner.

[0019] Figure 2 It is a top view of a low calorific value gas double preheating regenerative burner (including radiation tubes) of the utility model.

[0020] Figure 3 It is a top view of a low calorific value gas double preheating regenerative burner of the utility model (excluding the radiation tube).

[0021] Figure 4 This is a schematic diagram of the main box section of a low calorific value gas double preheating regenerative burner of the utility model. Figure 1 .

[0022] Figure 5 This is a schematic cross-sectional view of the main box of a low calorific value gas double preheating regenerative burner of the utility model. Figure 2 .

[0023] Figure 6This is a schematic diagram of the main box of a low calorific value gas double preheating regenerative burner of the utility model. Figure 3 .

[0024] Figure 7 This is a schematic diagram of a ventilation box of a low calorific value gas double preheating regenerative burner of the utility model. Figure 1 .

[0025] Figure 8 This is a schematic diagram of a ventilation box of a low calorific value gas double preheating regenerative burner of the utility model. Figure 2 .

[0026] Fig. 9 The utility model is a cavity schematic diagram of a low calorific value gas double preheating regenerative burner.

[0027] Figure numerals: 1, ventilation box; 2, main box; 3, radiation tube; 4, ventilation box partition; 5, air interface; 6, gas interface; 7, heat storage body; 8, premixing chamber; 9, smoke return pipe; 10, air heat storage channel; 11, gas heat storage channel; 12, first nozzle; 13, second nozzle; 14, first smoke return port; 15, second smoke return port; 16, first mixed combustion zone; 17, second mixed combustion zone; 18, flame outlet; 19, flame detection hole; 20, heat storage baffle; 21, observation hole; 22, ignition hole; 23, nozzle; 24, mixed combustion zone; 25, ventilation unit; 26, Middle partition layer; 27, main box partition; 28, air inlet and outlet; 29, cavity; 30, installation interface; 31, installation plate; 32, furnace wall; 41, first ventilation box partition; 42, second ventilation box partition; 51, first air interface; 52, second air interface; 61, first gas interface; 62, second gas interface; 81, first premixing chamber; 82, second premixing chamber; 101, first air heat storage channel; 102, second air heat storage channel; 111, first gas heat storage channel; 112, second gas heat storage channel; 251, first ventilation unit; 252, second ventilation unit. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1:

[0034] Combination Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the embodiment of the utility model discloses a low calorific value gas double preheating regenerative burner, comprising a connecting box body 1 and a main box body 2;

[0035] The connecting box 1 includes two sets of ventilation units 25, and the two sets of ventilation units 25 are respectively connected to the two inlet / exhaust ends 28 of the main box 2;

[0036] like Fig. 9 As shown, each group of ventilation units 25 and the inlet / exhaust end 28 of the main box 2 form a cavity 29, and a partition is arranged inside the cavity 29, which divides the cavity 29 into an air heat storage channel 10 and a gas heat storage channel 11, so that the gas and air can store and release heat independently; the air heat storage channel 10 and the gas heat storage channel 11 are both provided with a heat storage body 7, which can store heat for the air and gas introduced.

[0037] When one group of ventilation units 25 takes in gas and air, the other group of ventilation units 25 discharges smoke. After a period of time, the two groups of ventilation units 25 switch between intake and exhaust of smoke, completing the heat storage and heat release of the heat storage body 7.

[0038] Embodiment 2:

[0039] Combination Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the embodiment of the utility model discloses a low calorific value gas double preheating regenerative burner, comprising a connecting box body 1 and a main box body 2;

[0040] The connecting box 1 includes two sets of ventilation units 25, and the two sets of ventilation units 25 are respectively connected to the two inlet / exhaust ends 28 of the main box 2;

[0041] Each group of ventilation units 25 and the inlet / exhaust end 28 of the main box 2 form a cavity 29, and a partition is arranged inside the cavity 29, which divides the cavity 29 into an air heat storage channel 10 and a gas heat storage channel 11, so that the gas and air can store and release heat independently; the air heat storage channel 10 and the gas heat storage channel 11 are both provided with a heat storage body 7, which can store heat for the air and gas introduced.

[0042] When one group of ventilation units 25 takes in gas and air, the other group of ventilation units 25 discharges smoke. After a period of time, the two groups of ventilation units 25 switch between intake and exhaust of smoke, completing the heat storage and heat release of the heat storage body 7.

[0043] The difference between this embodiment and the first embodiment is that:

[0044] The connecting box 1 and the main box 2 are both axisymmetric structures;

[0045] like Figure 5 As shown, a premixing chamber 8 is provided inside the main box body 2 , and the premixing chamber 8 is arranged below the air heat storage channel 10 and the gas heat storage channel 11 .

[0046] A nozzle 23 is provided inside the main housing 2 , and the nozzle 23 is arranged in front of the premixing chamber 8 .

[0047] A mixing and combustion zone 24 is provided inside the main housing 2, and the mixing and combustion zone 24 is provided in front of the nozzle 23;

[0048] The main housing 2 is provided with a flame outlet 18 in the interior thereof, and the flame outlet 18 is arranged in front of the nozzle 23;

[0049] A smoke return port is provided between the nozzle 23 and the mixed combustion zone 24 .

[0050] Specifically, the premixing chamber includes a first premixing chamber 81 and a second premixing chamber nozzle 82, which are symmetrically arranged; the nozzle 23 includes a first nozzle 12 and a second nozzle 13, which have a crossing angle and are symmetrically arranged; the mixed combustion zone 24 includes a first mixed combustion zone 16 and a second mixed combustion zone 17, which are symmetrically arranged and both are connected to the flame outlet 18; the return smoke port includes a first return smoke port 14 and a second return smoke port 15, which are symmetrically arranged, the first return smoke port 14 is arranged between the first nozzle 12 and the first mixed combustion zone 16, and the second return smoke port 15 is arranged between the second nozzle 13 and the second mixed combustion zone 17;

[0051] A first nozzle 12, a first mixing and combustion zone 16 and a flame outlet 18 are sequentially arranged in front of the first premixing chamber 81;

[0052] A second nozzle 13 , a second mixing and combustion zone 17 and a flame outlet 18 are sequentially arranged in front of the second premixing chamber nozzle 82 .

[0053] The first smoke return port 14 and the second smoke return port 15 are both connected to the smoke return pipe 9 .

[0054] like Figure 2 As shown, the utility model is also provided with a radiation tube 3, which is an "M"-shaped structure. The smoke outlets on both sides of the radiation tube 3 are respectively connected to the first smoke return outlet 14 and the second smoke return outlet 15 through the smoke return pipe 9, and the smoke inlet in the middle of the radiation tube 3 is connected to the flame outlet 18.

[0055] Figure 2 The arrows in the figure indicate the direction of flue gas flow, so that the flue gas enters from the middle of the radiation tube 3, and then enters the main box body 2 from the smoke outlets on both sides of the radiation tube 3; after the flue gas on one side of the radiation tube 3 enters the main box body 2, it is sucked into the jet formed by the mixture of air and gas sprayed from the nozzle 23, and the flue gas is mixed with the gas and air to perform low-oxygen combustion, reducing NO x After the flue gas discharged from the other side of the radiation tube enters the main box, it is drawn out from the ventilation unit 25 on the other side by the induced draft fan to achieve heat storage in the ventilation unit 25 of the heat storage body 7.

[0056] The flame outlet 18 is provided with a mounting interface 30 and a mounting plate 31 connected to the furnace wall 32, and the flame outlet 18 is connected to the smoke inlet in the middle of the radiation tube 3 through the mounting interface 30; the first smoke return port 14 and the second smoke return port 15 are connected to the smoke outlets on both sides of the radiation tube 3 through the smoke exhaust port on the furnace wall 32, so that combustion and smoke exhaust do not interfere with each other. The distance and height of the furnace exhaust port can be distributed at different positions according to the uniform temperature requirement of the furnace.

[0057] Embodiment 3:

[0058] Combination Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the embodiment of the utility model discloses a low calorific value gas double preheating regenerative burner, comprising a connecting box body 1 and a main box body 2;

[0059] The connecting box 1 includes two sets of ventilation units 25, and the two sets of ventilation units 25 are respectively connected to the two inlet / exhaust ends 28 of the main box 2;

[0060] Each group of ventilation units 25 and the inlet / exhaust end 28 of the main box 2 form a cavity 29, and a partition is arranged inside the cavity 29, which divides the cavity 29 into an air heat storage channel 10 and a gas heat storage channel 11, so that the gas and air can store and release heat independently; the air heat storage channel 10 and the gas heat storage channel 11 are both provided with a heat storage body 7, which can store heat for the air and gas introduced.

[0061] When one group of ventilation units 25 takes in gas and air, the other group of ventilation units 25 discharges smoke. After a period of time, the two groups of ventilation units 25 are switched to complete heat storage and heat release.

[0062] The difference between this embodiment and the above embodiments is that:

[0063] like Figure 4 and Figure 1 As shown, the partition includes a ventilation box partition 4 and a main box partition 27. The ventilation box partition 4 is connected to the inner wall of the ventilation box 1, and the main box partition 27 is connected to the inner wall of the main box 2. The lower surface of the ventilation box partition 4 is against the upper surface of the main box partition 27.

[0064] The lower end of the ventilation box partition 4 is connected to the heat storage baffle 20 arranged inside the main box. The air and gas after heat storage in the air heat storage channel 10 and the gas heat storage channel 11 are evenly distributed through the heat storage baffle 20 and enter the premixing chamber 8, so that the gas and air are fully and evenly mixed.

[0065] The heat storage baffle 20 is a prior art and will not be described in detail here.

[0066] The ventilation unit 25 is provided with an air interface 5 and a gas interface 6, which are respectively connected to the air heat storage channel 10 and the gas heat storage channel 11; preferably, the air interface 5 is arranged above the ventilation unit 25, and the gas interface 6 is arranged on the side of the ventilation unit 25.

[0067] Specifically, the ventilation unit 25 includes a first ventilation unit 251 and a second ventilation unit 252; the air interface 5 includes a first air interface 51 and a second air interface 52; the gas interface 6 includes a first gas interface 61 and a second gas interface 62; the ventilation box baffle 4 includes a first ventilation box baffle 41 and a second ventilation box baffle 42; the air heat storage channel 10 includes a first air heat storage channel 101 and a second air heat storage channel 102; the gas heat storage channel 11 includes a first gas heat storage channel 111 and a second gas heat storage channel 112;

[0068] The first ventilation unit 251 is connected to the first air interface 51 at the top, and the first gas interface 61 is connected to the side of the first ventilation unit 251. The first ventilation box partition 41 is provided inside the first ventilation unit 251 to divide the inside of the first ventilation unit 251 into a first air heat storage channel 101 and a first gas heat storage channel 111.

[0069] The second ventilation unit 252 is connected to the second air interface 52 at the top, and is connected to the second gas interface 62 at the side. The second ventilation unit 252 is provided with a second ventilation box partition 42 inside, dividing the inside of the second ventilation unit 252 into a second air heat storage channel 102 and a second gas heat storage channel 112.

[0070] An intermediate partition layer 26 is provided between the two air inlet ends of the main box body 2. The main box body 2 is also provided with a flame detection hole 19, an observation hole 21 and an ignition hole 22. The three are opened on the side or bottom of the main box body 2, penetrate the intermediate partition layer 26, and are connected to the flame outlet 18. The three can be used interchangeably and are determined according to the specific conditions of the on-site installation space location;

[0071] Preferably, a flame detection hole 19 is opened on the side of the main box body 2. After the flame detection hole 19 passes through the middle partition layer 26, it is connected with the flame outlet 18, and the flame detection hole 19 is used for flame detection; the observation hole 21 is arranged below the flame detection hole 19. After the observation hole 21 passes through the middle partition layer, it is connected with the flame outlet 18, and the observation hole 21 is used for flame observation; the ignition hole 22 is located below the observation hole 21. After the ignition hole 22 passes through the middle partition layer, it is connected with the flame outlet 18, and the ignition hole 22 is used for igniting gas.

[0072] An automatic ignition device can be optionally provided on the ignition hole 22, and a flame detection device can be provided on the flame detection hole 19 to realize automatic remote control.

[0073] The main box body 1 comprises an inner layer, a middle layer and an outer layer, the inner layer is made of a refractory material, the middle layer is made of a heat insulating material, and the outer layer is made of a steel plate.

[0074] like Figure 3As shown, the working process of the low calorific value gas double preheating regenerative burner of the utility model is as follows:

[0075] The following description will be made by taking an example where the first ventilation unit 251 releases heat first and the second ventilation unit 252 stores heat.

[0076] The air enters the first air heat storage channel 101 through the first air interface 51 for heat storage, and the low calorific value gas enters the first gas heat storage channel 111 through the first gas interface 61 for heat storage, completing the heat release of the heat storage body 7 inside the first ventilation unit 251. The air and gas after heat storage enter the first premixing chamber 81 for mixing. After the mixed gas is ejected from the first nozzle 12, a jet at a certain speed is formed to inhale the flue gas from the first smoke return port 14. The mixed gas is ignited in the first mixed combustion zone 16 by the automatic ignition device provided on the ignition hole 22 to realize low-oxygen combustion. The first mixed combustion zone 16 can ensure the low-temperature stable combustion of the low calorific value fuel, and the flue gas generated by the combustion is vented. The smoke passes through the flame outlet 18 and enters the middle part of the radiation tube 3, and then is discharged from the smoke outlets on both sides of the radiation tube 3. The smoke on one side of the radiation tube 3 enters the main box 2 through the first smoke return port 14, is sucked into the jet formed by the fuel gas and air, and is burned again with low oxygen; the smoke on the other side of the radiation tube 3 enters the main box 2 through the second smoke return port 15, and is discharged from the second air interface 52 and the second fuel gas interface 62 under the action of the negative pressure formed by the induced draft fan, completing the heat storage of the heat storage body 7 of the second ventilation unit 252; thereby realizing the self-circulation reflux of the smoke and also realizing the fixing of the flame position; the smoke inhaled is mixed with the air and fuel gas to reduce the oxygen content in the air, realize low-oxygen combustion, and reduce NO x The flame gas volume is expanded, and a certain rigidity of the flame speed is formed at the flame outlet to increase the air flow disturbance in the furnace and improve the furnace temperature uniformity. At the same time, the flame speed with a certain rigidity can not be affected by the exhaust negative pressure on the other side;

[0077] After the above process has been running for a period of time, the second ventilation unit 252 is switched to release heat, and the first ventilation unit 251 is switched to store heat, and the cycle is repeated.

[0078] Parts not mentioned in detail in the present utility model belong to the prior art and are not the objects of protection of the present utility model.

[0079] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A low calorific value gas double preheating regenerative burner, characterized in that: It includes a connecting box and a main box; The connecting box includes two sets of ventilation units, and the two sets of ventilation units are respectively connected to the two inlet / exhaust ends of the main box; Each group of ventilation units and the inlet / exhaust ends of the main box form a cavity, and a partition is arranged inside the cavity, which divides the cavity into an air heat storage channel and a gas heat storage channel; heat storage bodies are arranged inside the air heat storage channel and the gas heat storage channel.

2. The low calorific value gas double preheating regenerative burner according to claim 1 is characterized in that: The partition includes a ventilation box partition and a main box partition. The ventilation box partition is connected to the inner wall of the ventilation box, the main box partition is connected to the inner wall of the main box, and the lower surface of the ventilation box partition is against the upper surface of the main box partition.

3. The low calorific value gas double preheating regenerative burner according to claim 2 is characterized in that: The lower end of the ventilation box partition is connected to a heat storage baffle arranged inside the main box.

4. The low calorific value gas double preheating regenerative burner according to any one of claims 1-2, characterized in that: The interior of the main box is symmetrically provided with a premixing chamber, which is arranged below the air heat storage channel and the gas heat storage channel.

5. The low calorific value gas double preheating regenerative burner according to claim 4 is characterized in that: The interior of the main box is symmetrically provided with nozzles and a mixed combustion zone, the nozzle is provided in front of the premixing chamber, the mixed combustion zone is provided in front of the nozzle, and a flame outlet is provided at the intersection of the mixed combustion zones; the interior of the main box is symmetrically provided with smoke return ports, the smoke return ports are provided between the nozzles and the mixed combustion zone, and are connected with the nozzles and the mixed combustion zone.

6. The low calorific value gas double preheating regenerative burner according to claim 5 is characterized in that: The smoke return port is connected with a smoke return pipe.

7. The low calorific value gas double preheating regenerative burner according to claim 6 is characterized in that: One end of the main box is connected to a radiation tube, which has an "M"-shaped structure.

8. The low calorific value gas double preheating regenerative burner according to claim 7 is characterized in that: The smoke outlets on both sides of the radiation tube are connected to the smoke return ports on both sides of the main box body, and the smoke inlet in the middle of the radiation tube is connected to the flame outlet.

9. The low calorific value gas double preheating regenerative burner according to any one of claims 1-2, characterized in that: Both ventilation units are provided with air interfaces and gas interfaces, which are connected to the air heat storage channel and the gas heat storage channel respectively.

10. The low calorific value gas double preheating regenerative burner according to any one of claims 1-2, characterized in that: When in use, one set of ventilation units is connected to the induced draft fan, and the two sets of ventilation units discharge smoke and inhale air alternately.

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