Heat accumulating type flameless combustion device

Abstract

The utility model discloses a heat accumulating type flameless combustion device which comprises a radiant tube and burner mechanisms symmetrically arranged at the two ends of the radiant tube, the two burner mechanisms are communicated with the two ends of the radiant tube respectively, each burner mechanism comprises a burner, a heat accumulator, a connecting assembly and an expansion joint, and the connecting assembly is used for connecting the burner with one end of the radiant tube; the burner comprises a shell, a nozzle and a gas pipe. The outer wall of the nozzle is sleeved with the heat accumulator, and the heat accumulator is located in the connecting assembly. The expansion joint sleeves one end, away from the shell, of the connecting assembly, and one end of the expansion joint is connected with one end of the radiant tube. According to the heat accumulating type flameless combustion device, the improved burner mechanisms are arranged, and the burner mechanisms are symmetrically arranged at the two ends of the radiant tube, so that the exhaust gas temperature can be reduced, heat in waste gas can be effectively recycled, and the heat efficiency is greatly improved. In addition, a flameless combustion mode is adopted, the situation that the temperature of local flames is too high during combustion can be avoided, and generation of temperature type nitric oxide is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of combustion device, specifically relates to a heat forming heating furnace heat accumulating type flameless combustion device. BACKGROUND

[0002] The most effective method to improve the efficiency of the combustion system is to preheat the combustion air to concentrate the air preheating temperature that the heat exchanger can reach, but if the flue gas temperature is high, the heat exchanger material cost will be too high, the present heat forming heating furnace uses self-preheating burner, the self-preheating burner mainly applies counterflow heat exchanger and high-temperature air combustion technology, wherein the heat exchanger is more widely used, although the self-preheating burner can also improve the air preheating temperature, but the heat exchange capacity of the burner is limited.

[0003] In addition, the waste gas generated by the heat forming heating furnace combustion is directly discharged through the self-preheating burner, and the negative influence of nitrogen oxides in the waste gas on human health and environment brings more and more pressure to the operators and manufacturers of the combustion equipment. CONTENT OF THE UTILITY MODEL

[0004] Therefore, in order to overcome the defects of the prior art, the utility model aims at providing a heat accumulating type flameless combustion device, which can effectively recover the heat in the waste gas, greatly improve the thermal efficiency, and reduce the generation of temperature type nitrogen oxides.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A heat accumulating type flameless combustion device, comprising a radiation pipe and burner mechanisms symmetrically arranged at both ends of the radiation pipe, two burner mechanisms are respectively communicated with both ends of the radiation pipe, each burner mechanism comprises a burner, a heat accumulator, a connecting assembly and an expansion joint, the connecting assembly is used for connecting the burner and one end of the radiation pipe, the burner comprises a shell, a nozzle and a gas pipe, the heat accumulator is sleeved on the outer wall of the nozzle, and the heat accumulator is located in the interior of the connecting assembly, the expansion joint is sleeved on the end of the connecting assembly away from the shell, and one end of the expansion joint is connected with one end of the radiation pipe.

[0007] According to the preferred embodiment aspect of the utility model, the connecting assembly comprises a first connecting pipe, a second connecting pipe, a first sleeve pipe and a second sleeve pipe, one end of the first connecting pipe is fixedly connected with one end of the second connecting pipe, and one end of the second connecting pipe is located in the interior of one end of the radiation pipe. The cavity of the radiation pipe is used for the combustion chamber for combustion, and the combustion products can also be prevented from entering the furnace.

[0008] According to the preferred embodiment of the utility model, the axis of the first connecting pipe coincides with the axis of the second connecting pipe, the axis of the first sleeve coincides with the axis of the second sleeve, and the axis of the first connecting pipe coincides with the axis of the first sleeve.

[0009] According to the preferred embodiment of the utility model, the inner diameter of the first connecting pipe is larger than the outer diameter of the second connecting pipe, the outer diameter of the nozzle is smaller than the inner diameter of the second connecting pipe, the heat accumulator is located in the cavity of the first connecting pipe, and the length of the heat accumulator is smaller than the length of the first connecting pipe. The heat accumulator is used for recycling exhaust gas and preheating combustion air.

[0010] According to the preferred embodiment of the utility model, the first sleeve is sleeved on the outer wall of the first connecting pipe, the inner diameter of the first sleeve is larger than the outer diameter of the first connecting pipe, the second sleeve is sleeved on the outside of the expansion joint, and one end of the first sleeve is fixedly connected with one end of the second sleeve. In addition, heat insulation material is arranged between the outer wall of the first connecting pipe and the inner wall of the first sleeve for heat preservation and preventing heat loss.

[0011] According to the preferred embodiment of the utility model, the expansion joint is sleeved on the outer wall of the second connecting pipe, and the length of the expansion joint is smaller than the length of the second sleeve.

[0012] According to the preferred embodiment of the utility model, the expansion joint comprises an expansion body and connecting blocks located at both ends of the expansion body, the outer diameter of the expansion body is smaller than the outer diameter of the connecting blocks, one of the connecting blocks is flush with one end of the second sleeve close to the first sleeve and has a gap between the one end of the first connecting pipe close to the second connecting pipe, and the other connecting block is fixedly connected with one end of the radiation pipe. The expansion joint is used for absorbing the increased length of the radiation pipe after being heated and expanded, so the length of the expansion joint is set to be smaller than the length of the second sleeve, and the outer diameter of the expansion body is set to be smaller than the outer diameter of the connecting blocks, so that after the radiation pipe is heated and lengthened, the expansion joint has enough space to shrink, and after the radiation pipe is cooled and shrunk, the expansion joint also has space to rebound.

[0013] According to the preferred embodiment of the utility model, the shell comprises a first shell, a second shell and a fixed plate, the first shell is located in the cavity of the second shell, the axis of the first shell coincides with the axis of the second shell, the fixed plate is used for connecting one end of the second shell and the first shell close to the heat accumulator, one side of the fixed plate is attached to the other end of the first sleeve, the nozzle penetrates the length direction of the first shell and the second shell, and one end of the nozzle away from the shell is located inside one end of the radiation pipe. The burner shell is used for fixing the heat accumulator in the burner, the gas nozzle and the air flow guide

[0014] According to the preferred embodiment of the utility model, the first shell is fixedly provided with a first blocking ring at one end away from the heat accumulator, the second shell is fixedly provided with a second blocking ring at one end away from the heat accumulator, the inner diameter of the first blocking ring and the second blocking ring is greater than the outer diameter of the nozzle, the inner diameter of the second shell is greater than the outer diameter of the first shell, the length of the second shell is greater than the length of the first shell, and a cavity is formed between the outer wall of the first shell, the inner wall of the second shell and the first blocking ring and the second blocking ring. The nozzle is used for spraying gas into the radiation pipe.

[0015] According to the preferred embodiment of the utility model, the burner further comprises a flow pipe and a gas inlet fixedly arranged on the second shell, the flow pipe is in communication with the cavity, and each flow pipe on the burner is used as a combustion air inlet and / or a flue gas outlet; the gas inlet is in communication with one end of the gas pipe, and the other end of the gas pipe is in communication with one end of the nozzle. In some embodiments of the utility model, when the burner at the left end of the radiation pipe works, the flow pipe on the burner is a combustion air inlet, and the flow pipe on the burner at the right end of the radiation pipe is a flue gas outlet; when the burner at the right end of the radiation pipe works, the flow pipe on the burner is a combustion air inlet, and the flow pipe on the burner at the left end of the radiation pipe is a flue gas outlet. Such a design enables the burners on both sides of the radiation pipe to realize one-side burning and the other-side flue gas exhaust during combustion, and the side for flue gas exhaust can also recover waste heat, which can effectively recover heat in the waste gas and greatly improve thermal efficiency. When the heating furnace is just started to heat, it is in a low-temperature combustion mode; when the furnace temperature reaches above 850 DEG C, it enters a flameless combustion mode.

[0016] Compared with the prior art, the utility model has the advantages that: the heat accumulating type flameless combustion device of the utility model, by setting the improved burner mechanism, and symmetrically setting the burner mechanism at both ends of the radiation pipe, compared with the self-preheating type burner used by the existing thermoforming heating furnace, the exhaust gas temperature is reduced, the heat in the waste gas can be effectively recovered, and the thermal efficiency is greatly improved. In addition, the flameless combustion mode can avoid local flame temperature being too high during combustion and reduce the generation of temperature type nitrogen oxides. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a three-dimensional structure schematic view of the heat accumulating type flameless combustion device in the embodiments of the utility model.

[0019] Figure 2 It is the three-dimensional structure schematic view of the burner mechanism in the embodiment of the utility model;

[0020] Figure 3 It is the side view structure schematic view of the burner mechanism in the embodiment of the utility model;

[0021] Figure 4 It is Figure 3 It is the cross section structure schematic view along A-A direction;

[0022] Among them, the reference sign is:

[0023] Radiation pipe-1, burner mechanism-2, first shell-211, second shell-212, fixed plate-213, first blocking ring-214, second blocking ring-215, nozzle-216, gas pipe-217, flow pipe-218, gas inlet-219, cavity-Q, heat accumulator-22, first connecting pipe-231, second connecting pipe-232, first sleeve pipe-233, second sleeve pipe-234, expansion body-241, connecting block-242, ignition electrode-3, ignition end-31. Specific implementation

[0024] In order to make the personnel in the technical field better understand the technical scheme of the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the scope of protection of the utility model.

[0025] Referring to Figures 1 to 4 The heat accumulating type flameless combustion device of the embodiment includes radiation pipe 1 and burner mechanism 2 symmetrically arranged at both ends of the radiation pipe 1, two burner mechanisms 2 are respectively communicated with both ends of the radiation pipe 1, each burner mechanism 2 includes a burner, a heat accumulator 22, a connecting assembly and an expansion knot, and the connecting assembly is used for connecting the burner and one end of the radiation pipe 1.

[0026] Further, each burner comprises a shell, a nozzle 216, a gas pipe 217, a flow pipe 218, a gas inlet 219 and an ignition electrode 3, and a heat storage body 22 is sleeved on the outer wall of the nozzle 216. The shell comprises a first shell 211, a second shell 212, a first blocking ring 214, a second blocking ring 215 and a fixed plate 213, the first shell 211 is located in the cavity of the second shell 212, and the axis of the first shell 211 coincides with the axis of the second shell 212; the fixed plate 213 is used for connecting the second shell 212 and the first shell 211 close to one end of the heat storage body 22. The first shell 211 is fixedly provided with the first blocking ring 214 at the end away from the heat storage body 22, the second shell 212 is fixedly provided with the second blocking ring 215 at the end away from the heat storage body 22, the inner diameters of the first blocking ring 214 and the second blocking ring 215 are greater than the outer diameter of the nozzle 216, the inner diameter of the second shell 212 is greater than the outer diameter of the first shell 211, and the length of the second shell 212 is greater than the length of the first shell 211, and the outer wall of the first shell 211, the inner wall of the second shell 212 and the first blocking ring 214 and the second blocking ring 215 form a cavity Q for the flow of combustion-supporting air and / or flue gas.

[0027] The nozzle 216 penetrates the length direction of the first shell 211 and the second shell 212, the length direction of the nozzle 216 is parallel to the length direction of the radiant tube 1, one end of the nozzle 216 away from the shell is located inside one end of the radiant tube 1, the other end of the nozzle 216 is flush with the second blocking ring 215, and the gas pipe 217 is located inside the nozzle 216. The flow pipe 218 and the gas inlet 219 are fixedly provided on the second shell 212, the gas inlet 219 communicates with one end of the gas pipe 217, the other end of the gas pipe 217 communicates with one end of the nozzle 216, so that the gas enters the nozzle 216 and is sprayed into the radiant tube 1 by the nozzle 216. The flow pipe 218 communicates with the cavity Q, when the burner at the left end of the radiant tube 1 works, the flow pipe 218 located on the burner is the combustion-supporting air inlet, and the flow pipe 218 located on the burner at the right end of the radiant tube 1 is the flue gas outlet; when the burner at the right end of the radiant tube 1 works, the flow pipe 218 located on the burner is the combustion-supporting air inlet, and the flow pipe 218 located on the burner at the left end of the radiant tube 1 is the flue gas outlet. When the furnace temperature reaches 850℃ or above, the flameless combustion mode is entered. In addition, the ignition end 31 of the ignition electrode 3 is arranged inside the end of the nozzle 216 away from the shell, when the gas enters the inside of the end of the nozzle 216, the gas is ignited to burn under the action of the spark generated at the ignition end 31.

[0028] Further, the connecting assembly comprises a first connecting pipe 231, a second connecting pipe 232, a first sleeve pipe 233 and a second sleeve pipe 234. One end of the first connecting pipe 231 is fixedly connected with one end of the second connecting pipe 232. One end of the second connecting pipe 232 is located inside one end of the radiation pipe 1. The heat accumulator 22 is located in the cavity of the first connecting pipe 231 and the length of the heat accumulator 22 is less than the length of the first connecting pipe 231. The heat accumulator 22 is used for recovering exhaust gas and preheating combustion air. One end of the first sleeve pipe 233 is fixedly connected with one end of the second sleeve pipe 234. The other end of the first sleeve pipe 233 is attached to one side of the fixed plate 213. The first sleeve pipe 233 is sleeved on the outer wall of the first connecting pipe 231. The second sleeve pipe 234 is sleeved on the outside of the expansion joint. Insulation material (not shown) is arranged between the outer wall of the first connecting pipe 231 and the inner wall of the first sleeve pipe 233 for heat preservation to prevent heat loss.

[0029] Specifically, the inner diameter of the first connecting pipe 231 is greater than the outer diameter of the second connecting pipe 232. The inner diameter of the first sleeve pipe 233 is greater than the outer diameter of the first connecting pipe 231. The axis of the first connecting pipe 231 coincides with the axis of the second connecting pipe 232. The axis of the first sleeve pipe 233 coincides with the axis of the second sleeve pipe 234. The axis of the first connecting pipe 231 coincides with the axis of the first sleeve pipe 233. The outer diameter of the nozzle 216 is less than the inner diameter of the second connecting pipe 232. The end of the nozzle 216 away from the shell penetrates the second connecting pipe 232 away from the first connecting pipe 231, ensuring that the nozzle 216 communicates with the radiation pipe 1.

[0030] The expansion joint is sleeved on the outer wall of the second connecting pipe 232. The length of the expansion joint is less than the length of the second sleeve pipe 234. Specifically, the expansion joint comprises an expansion body 241 and connecting blocks 242 located at both ends of the expansion body 241. One of the connecting blocks 242 is flush with the end of the second sleeve pipe 234 close to the first sleeve pipe 233 and has a gap between the first connecting pipe 231 close to the second connecting pipe 232. The outer diameter of the expansion body 241 is less than the outer diameter of the connecting block 242. This arrangement ensures that the expansion joint is used to absorb the increased length of the radiation pipe 1 after being heated and expanded, and after the radiation pipe 1 is heated and lengthened, the expansion joint has enough space to contract. At the same time, after the radiation pipe 1 shrinks when it is cold, the expansion joint also has space to rebound. The other connecting block 242 of the expansion joint is fixedly connected with one end of the radiation pipe 1.

[0031] The working principle of the heat accumulating flameless combustion device in the embodiment is briefly described as follows:

[0032] The combustion process of the flameless combustion device of the embodiment is divided into low-temperature combustion mode and flameless combustion mode. When the heating furnace needs to start heating, the burner is in low-temperature combustion mode, natural gas enters the burner from the gas inlet 219 on the left side of the radiation pipe 1, combustion air enters the nozzle 216 from the flow pipe 218 on the left side, passes through the heat storage body 22, is ignited by the ignition electrode 3, and natural gas and combustion air are mixed and combusted again in the radiation pipe 1, and flue gas is discharged from the flow pipe 218 on the right side of the radiation pipe 1. After a certain period of combustion, the burner on the other side (the right side) is switched to combustion, and flue gas is discharged from the flow pipe 218 on the left side of the radiation pipe 1.

[0033] When the hearth temperature is greater than 850℃, the flameless combustion mode is switched, the combustion system automatically adjusts the gas pressure to high pressure, natural gas enters the burner from the gas inlet 219 on the left side of the radiation pipe 1 and is sprayed into the radiation pipe 1 by the nozzle 216, combustion air enters the nozzle 216 from the flow pipe 218 on the left side, passes through the heat storage body 22, is ignited by the ignition electrode 3, and natural gas and combustion air are mixed and combusted in the radiation pipe 1, and flue gas is discharged from the flow pipe 218 on the right side of the radiation pipe 1. After a certain period of combustion, the burner on the other side (the right side) is switched to combustion, and flue gas is discharged from the flow pipe 218 on the left side of the radiation pipe 1. The burners are repeatedly switched in this way, one side of the burner can be combusted, the other side of the burner can discharge flue gas, and the side discharging flue gas can also perform waste heat recovery, thereby effectively recovering heat in the exhaust gas and greatly improving thermal efficiency.

[0034] The above embodiment is only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A regenerative non-combustion apparatus, characterized by: The application relates to a radiation tube and burner mechanism symmetrically arranged at both ends of the radiation tube, wherein the two burner mechanisms are respectively communicated with the two ends of the radiation tube, each burner mechanism comprises a burner, a heat accumulator, a connecting assembly and an expansion joint, the connecting assembly is used for connecting the burner with one end of the radiation tube, the burner comprises a shell, a nozzle and a gas pipe, the heat accumulator is sleeved on the outer wall of the nozzle and located in the interior of the connecting assembly, and the expansion joint is sleeved on the end of the connecting assembly far away from the shell and connected with one end of the radiation tube.

2. The regenerative flameless combustion apparatus according to claim 1, characterized in that: The connecting assembly comprises a first connecting pipe, a second connecting pipe, a first sleeve pipe and a second sleeve pipe, one end of the first connecting pipe is fixedly connected with one end of the second connecting pipe, and one end of the second connecting pipe is located in the interior of one end of the radiation tube.

3. The regenerative, flameless combustion apparatus of claim 2, wherein: The axial center line of the first connecting pipe coincides with the axial center line of the second connecting pipe, the axial center line of the first sleeve pipe coincides with the axial center line of the second sleeve pipe, and the axial center line of the first connecting pipe coincides with the axial center line of the first sleeve pipe.

4. The regenerative flameless combustion apparatus according to claim 3, characterized in that: The inner diameter of the first connecting pipe is larger than the outer diameter of the second connecting pipe, the outer diameter of the nozzle is smaller than the inner diameter of the second connecting pipe, the heat accumulator is located in the cavity of the first connecting pipe, and the length of the heat accumulator is smaller than the length of the first connecting pipe.

5. The regenerative, flameless combustion apparatus of claim 4, wherein: The first sleeve pipe is sleeved on the outer wall of the first connecting pipe, the inner diameter of the first sleeve pipe is larger than the outer diameter of the first connecting pipe, the second sleeve pipe is sleeved on the exterior of the expansion joint, and one end of the first sleeve pipe is fixedly connected with one end of the second sleeve pipe.

6. The regenerative, flameless combustion apparatus of claim 5, wherein: The expansion joint is sleeved on the outer wall of the second connecting pipe, and the length of the expansion joint is smaller than the length of the second sleeve pipe.

7. The regenerative flameless combustion apparatus according to claim 6, characterized in that: The expansion joint comprises an expansion body and connecting blocks located at both ends of the expansion body, the outer diameter of the expansion body is smaller than the outer diameter of the connecting blocks, one connecting block is flush with one end of the second sleeve pipe close to the first sleeve pipe and has a gap with the first connecting pipe close to the second connecting pipe, and the other connecting block is fixedly connected with one end of the radiation tube.

8. The regenerative flameless combustion apparatus according to claim 2, wherein: The shell comprises a first shell, a second shell and a fixed plate, the first shell is located in the cavity of the second shell, the axial center line of the first shell coincides with the axial center line of the second shell, the fixed plate is used for connecting the second shell with the first shell close to one end of the heat accumulator, one side of the fixed plate is attached to the other end of the first sleeve pipe, the nozzle penetrates the length direction of the first shell and the second shell, and one end of the nozzle far away from the shell is located in the interior of one end of the radiation tube.

9. The regenerative flameless combustion apparatus according to claim 8, characterized in that: One end of the first shell far away from the heat accumulator is fixedly provided with a first stop ring, one end of the second shell far away from the heat accumulator is fixedly provided with a second stop ring, the inner diameters of the first stop ring and the second stop ring are all larger than the outer diameter of the nozzle, the inner diameter of the second shell is larger than the outer diameter of the first shell, the length of the second shell is larger than the length of the first shell, and the cavity is formed between the outer wall of the first shell, the inner wall of the second shell and the first stop ring and the second stop ring.

10. The regenerative flameless combustion apparatus according to claim 9, characterized in that: The burner further comprises a flow pipe and a gas inlet fixedly arranged on the second shell, the flow pipe is communicated with the cavity, and the flow pipe on each of the burners is used as a combustion air inlet and / or a flue gas outlet; the gas inlet is communicated with one end of a gas pipe, and the other end of the gas pipe is communicated with one end of the nozzle.

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