Energy-saving kiln

Abstract

The utility model discloses an energy-saving kiln which comprises a kiln tail, a gas pipe and a heating pipe, and the kiln tail comprises a cavity. The gas pipe is located outside the kiln tail and used for conveying gas. The heating pipe is located in the cavity, and the two ends of the heating pipe extend out of the kiln tail and are connected with the gas pipe in parallel, so that gas conveyed by the gas pipe can be distributed into the heating pipe. Gas flowing through the heating pipe can be heated through high-temperature tail gas in the kiln tail, the temperature of the gas is increased, sensible heat of the gas is increased, and therefore energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the waste heat utilization technical field, and particularly relates to an energy-saving furnace. BACKGROUND

[0002] Generally, the kiln gas is ignited at the burner, and the flue gas temperature in the kiln is increased by the heat generated by the gas combustion, so that the ceramic products are fired. Compared with the gas with high temperature and self-heat, the energy consumption required for the kiln operation will increase if the conventional gas is close to the ambient temperature. If the heat generated by the gas combustion is used to heat the gas, the energy consumption will also increase. Therefore, it is necessary to find another way to increase the gas temperature. SUMMARY

[0003] The utility model discloses an energy-saving furnace, which aims to solve the technical problem of increased energy consumption of normal-temperature gas in the kiln combustion process in the prior art.

[0004] To solve the above technical problems, the technical scheme adopted by the utility model is as follows:

[0005] The utility model discloses an energy-saving furnace, which comprises:

[0006] A kiln tail comprises a cavity;

[0007] A gas pipe is located outside the kiln tail and is used to convey gas;

[0008] A heating pipe is located in the cavity, and both ends of the heating pipe extend out of the kiln tail and are connected in parallel with the gas pipe, so that the gas conveyed by the gas pipe can be shunted into the heating pipe.

[0009] The energy-saving furnace has at least the following beneficial effects: during the production and operation of the energy-saving furnace, the cavity inside the kiln tail has high-temperature tail gas. When the gas is conveyed in the gas pipe, it can be shunted into the heating pipe through the connected heating pipe. The heating pipe is located in the cavity. Therefore, the gas flowing through the heating pipe can exchange heat with the high-temperature tail gas in the cavity through the pipe wall of the heating pipe, thereby increasing the gas temperature in the heating pipe. Since the heating pipe and the gas pipe are connected in parallel, the high-temperature gas after being heated returns to the gas pipe and mixes with the normal-temperature gas conveyed along the gas pipe. When the gas is conveyed along the gas pipe to the burner at the kiln head, the gas temperature is increased, and the sensible heat carried by the gas is increased. Therefore, the energy consumption required for the production of the energy-saving furnace is reduced, and the operating cost is reduced.

[0010] As a further improvement of the above technical scheme, the gas pipe is provided with a control valve, and the control valve is located between the two connection ends of the gas pipe and the heating pipe.

[0011] As a further improvement of the above technical solution, the gas pipe comprises a gas inlet pipe, a straight-through pipe and a gas outlet pipe connected in sequence, the straight-through pipe and the heating pipe are connected in parallel, and the control valve is located in the straight-through pipe.

[0012] As a further improvement of the above technical solution, the gas outlet pipe is provided with a temperature sensor, and the control valve is configured to adjust the gas flow of the straight-through pipe according to the gas temperature detected by the temperature sensor, so that the gas temperature reaches a preset temperature.

[0013] As a further improvement of the above technical solution, the heating pipe comprises a plurality of heating branch pipes connected in parallel and located in the cavity.

[0014] As a further improvement of the above technical solution, the gas outlet pipe is provided with a first heat preservation layer, the heating pipe has a pipe section connected with the gas outlet pipe and extending out of the cavity, and the pipe section is provided with a second heat preservation layer.

[0015] As a further improvement of the above technical solution, the gas inlet pipe is provided with a first pressure sensor, a flow meter, a pressure reducing valve and a second pressure sensor in sequence along the flow direction of the gas, and the pressure reducing valve is configured to adjust the gas pressure in the gas inlet pipe according to the gas pressure detected by the first pressure sensor and the gas flow detected by the flow meter, so that the gas pressure reaches a preset pressure.

[0016] As a further improvement of the above technical solution, the gas inlet pipe is further provided with a diffusion valve, and the diffusion valve is arranged between the pressure reducing valve and the second pressure sensor.

[0017] As a further improvement of the above technical solution, the gas inlet pipe is provided with a first switch valve and a second switch valve at both ends along the flow direction of the gas respectively, and the heating pipe is provided with a third switch valve and a fourth switch valve at both ends along the flow direction of the gas respectively.

[0018] As a further improvement of the above technical solution, the gas inlet end of the gas inlet pipe and one end of the gas outlet pipe connected with the heating pipe are respectively provided with expansion joints. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in connection with the drawings and examples;

[0020] Figure 1 is the overhead structure schematic diagram of energy-saving furnace kiln provided by the utility model embodiment;

[0021] Figure 2 is the front view structure schematic diagram of kiln tail corresponding gas inlet pipe provided by the utility model embodiment;

[0022] Figure 3is a front view structural schematic diagram of a straight-through pipe corresponding to a kiln tail provided by an embodiment of the present utility model;

[0023] Figure 4 is a front view structural schematic diagram of an air outlet pipe corresponding to a kiln tail provided by an embodiment of the present utility model;

[0024] Figure 5 is a side view structural schematic diagram of a straight-through pipe corresponding to a kiln tail provided by an embodiment of the present utility model;

[0025] Figure 6 is a side view structural schematic diagram of an air outlet pipe corresponding to a kiln tail provided by an embodiment of the present utility model.

[0026] The marks in the drawings are as follows:

[0027] 100, energy-saving furnace; 110, kiln tail; 111, cavity;

[0028] 200, gas pipe; 210, control valve; 220, air inlet pipe; 230, straight-through pipe; 240, air outlet pipe; 241, temperature sensor;

[0029] 300, heating pipe; 310, heating branch pipe; 320, first connecting pipe; 330, second connecting pipe;

[0030] 400, diffusion valve;

[0031] 510, first pressure sensor; 520, pressure reducing valve; 530, second pressure sensor; 540, gas filter; 550, flow meter; 560, pressure measuring nozzle;

[0032] 610, first on-off valve; 620, second on-off valve; 630, third on-off valve; 640, fourth on-off valve;

[0033] 700, expansion joint. DETAILED DESCRIPTION

[0034] This part will describe the specific embodiments of the present utility model in detail, the preferred embodiments of the present utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present utility model, but it cannot be understood as the limitation of the protection scope of the present utility model.

[0035] In the description of the present utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as the limitation of the present utility model.

[0036] In the description of the utility model, if there is a word such as "several" description, its meaning is one or more, the meaning of multiple is two and above, greater than, less than, exceed etc. Understand as not including this number, above, below, within etc. Understand as including this number. If the first, second, third is described, it is only used for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] It should be noted that the X direction in the drawing is from the rear side of the energy-saving furnace to the front side; The Y direction is from the right side of the energy-saving furnace to the left side; The Z direction is from the lower side of the energy-saving furnace to the upper side.

[0038] In the description of the utility model, unless otherwise specified, the words such as setting, installation, connection should be understood in a broad sense, and the skilled in the art can determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0039] Referring to Figures 1 to 6 , the following will give several embodiments of the energy-saving furnace of the utility model.

[0040] As Figures 1 to 6 shown, the energy-saving furnace 100 of the utility model embodiment includes kiln tail 110, gas pipe 200 and heating pipe 300. Specifically, the kiln tail 110 includes cavity 111 for production, and the cavity 111 has high-temperature tail gas after production. The gas pipe 200 is located outside the kiln tail 110, the gas pipe 200 extends along the long end of the kiln tail 110 in parallel and is connected with a burner at the kiln head position, the gas pipe 200 is used to deliver gas to the burner, and the gas is ignited after mixing with air at the burner. The heating pipe 300 is located in the cavity 111, and the two ends of the heating pipe 300 extend out of the kiln tail 110 and are connected in parallel with the gas pipe 200. When the gas pipe 200 delivers gas, part of the gas is shunted into the connected heating pipe 300, and after the gas flows through the heating pipe 300, it is returned to the gas pipe 200 through the connection between the heating pipe 300 and the gas pipe 200, and then delivered to the burner.

[0041] In this way, when the cavity 111 has high-temperature tail gas, the high-temperature tail gas can increase the temperature of the tube wall of the heating pipe 300. The fuel gas is transported along the fuel gas pipe 200, and the fuel gas flowing into the heating pipe 300 is heated by heat exchange with the tube wall of the heating pipe 300, that is, the high-temperature tail gas in the cavity 111 indirectly heats the fuel gas in the heating pipe 300. The high-temperature fuel gas output from the heating pipe 300 mixes with the normal-temperature fuel gas transported in the fuel gas pipe 200, so that the temperature of the fuel gas transported to the burner is increased, the sensible heat of the fuel gas is increased, and thus the heat value released by the fuel gas when combusted is more, the energy consumption of the energy-saving furnace 100 is reduced, and the operation cost is reduced.

[0042] It can be understood that the heating pipe 300 includes a first connecting pipe 320 and a second connecting pipe 330, as shown in Figure 1 and Figure 3 . The heating pipe 300 and the fuel gas pipe 200 are connected in parallel, and actually, the first connecting pipe 320 and the second connecting pipe 330 are respectively connected to both ends of the fuel gas pipe 200 along the transportation direction of the fuel gas. Therefore, when the fuel gas pipe 200 transports the fuel gas, part of the fuel gas flows along the fuel gas pipe 200, and the other part of the fuel gas is input from the first connecting pipe 320, flows through the cavity 111, and is heated and then returned to the fuel gas pipe 200 from the second connecting pipe 330.

[0043] It can be understood that the fuel gas pipe 200 is provided with a control valve 210, as shown in Figure 1 and Figure 3 . The control valve 210 is used to control the flow of the fuel gas in the fuel gas pipe 200, indirectly control the flow of the fuel gas flowing through the heating pipe 300, and thus control the heating temperature of the fuel gas, so as to avoid the decrease of the combustion efficiency caused by the too high temperature of the fuel gas.

[0044] It can be understood that the control valve 210 is located between the two connecting ends of the fuel gas pipe 200 and the heating pipe 300, that is, between the connecting end of the fuel gas pipe 200 and the first connecting pipe 320 and the connecting end of the fuel gas pipe 200 and the second connecting pipe 330. Therefore, under the condition of a certain pressure, if the temperature of the fuel gas is too high, the control valve 210 is adjusted, so that the opening of the control valve 210 is increased, more fuel gas directly flows along the fuel gas pipe 200, the flow of the fuel gas into the heating pipe 300 is reduced, and the amount of the fuel gas for heat exchange is reduced, so as to reduce the temperature of the fuel gas.

[0045] If the temperature of the fuel gas is too low, the control valve 210 is adjusted, so that the opening of the control valve 210 is reduced, the fuel gas is difficult to directly flow along the fuel gas pipe 200, the flow of the fuel gas into the heating pipe 300 is increased, and the amount of the fuel gas for heat exchange is increased, so as to increase the temperature of the fuel gas.

[0046] In this embodiment, the fuel gas pipe 200 includes an inlet pipe 220, a straight-through pipe 230, and an outlet pipe 240 connected in sequence along the transportation direction of the fuel gas, as shown in Figure 1As shown. The heating element 300 and the straight pipe 230 are connected in parallel. Specifically, the first connecting pipe 320 connects to the junction of the inlet pipe 220 and the straight pipe 230, and the second connecting pipe 330 connects to the junction of the straight pipe 230 and the outlet pipe 240. The gas input from the inlet pipe 220 is diverted to the straight pipe 230 and the heating element 300. The control valve 210 is located in the straight pipe 230. By adjusting the opening of the control valve 210, the flow rate of the gas flowing into the straight pipe 230 is adjusted, thereby changing the flow rate of the gas flowing into the heating element 300 and achieving gas temperature regulation. The outlet pipe 240 receives the ambient temperature gas output from the straight pipe 230 and the high-temperature gas output from the heating element 300. The ambient temperature gas and the high-temperature gas mix in the outlet pipe 240, ensuring a uniform gas temperature delivered to the burner.

[0047] It is understandable that the exhaust pipe 240 is equipped with a temperature sensor 241, such as Figure 1 , Figure 4 and Figure 6 As shown. Temperature sensor 241 is used to detect the temperature of the mixed gas in the gas pipe 240, so as to adjust control valve 210 according to the gas temperature detected by temperature sensor 241. Control valve 210 has a preset temperature. Control valve 210 automatically adjusts according to the gas temperature detected by temperature sensor 241 to ensure that the gas temperature accurately reaches the preset temperature, ensuring that the gas temperature is high enough to increase the sensible heat of the gas, avoiding the increase in energy consumption due to excessively low gas temperature, and avoiding the waste of kiln tail waste heat due to excessively high gas temperature.

[0048] It is understandable that the control valve 210 and the temperature sensor 241 are connected by a signal. The control valve 210 receives the gas temperature detected by the temperature sensor 241, compares it with the preset temperature and the gas temperature in the gas outlet pipe 240, and adjusts the opening size of the control valve 210 according to the gas temperature detected by the temperature sensor 241.

[0049] Understandably, when the gas temperature detected by temperature sensor 241 is lower than the preset temperature, control valve 210 automatically adjusts its opening to decrease, increasing the gas flow rate into heating tube 300 and thus raising the gas temperature. When the gas temperature detected by temperature sensor 241 is higher than the preset temperature, control valve 210 automatically adjusts its opening to increase, decreasing the gas flow rate into heating tube 300.

[0050] In this embodiment, the temperature sensor 241 is a thermistor.

[0051] In some embodiments, the control valve 210 is a temperature control valve, which is connected to the temperature sensor 241. The temperature control valve receives the gas temperature detected by the temperature sensor 241 and automatically adjusts its opening.

[0052] In the embodiment, the control valve 210 is equipped with a controller which is signal connected with the control valve 210 and the temperature sensor 241 respectively, and the preset temperature is set by the controller, and when the gas temperature is higher or lower than the preset temperature, the controller automatically adjusts the opening size of the control valve 210.

[0053] In the embodiment, the control valve 210 is a linear valve, and an actuator for receiving the controller signal and performing the opening adjustment is arranged in the linear valve. The controller can be a single-chip microcomputer or a PCL controller, and the opening control of the control valve 210 can be simply realized. It should be noted that the control mode of the controller does not belong to the protection scope of the utility model, and belongs to the prior art. The utility model mainly protects the connection mode of the controller.

[0054] In some embodiments, the gas input into the heating pipe 300 exchanges heat with the high-temperature tail gas through the pipe wall of the heating pipe 300. However, since the diameter of the heating pipe 300 is fixed, the pipe wall area of the heating pipe 300 is fixed, and the heat exchange efficiency is fixed, when the gas flow rate input into the heating pipe 300 is large, the heat exchange efficiency is low, and the gas temperature is easily low.

[0055] In other embodiments, the gas input into the heating pipe 300 is branched in the cavity 111. Specifically, the heating pipe 300 includes a plurality of heating branch pipes 310 which are connected in parallel and located in the cavity 111, as shown in Figs. 5 and 6. Figure 1 and Figure 5 In this way, the gas input into the heating pipe 300 is branched into the plurality of heating branch pipes 310 in the cavity 111, and the gas in the corresponding heating branch pipe 310 exchanges heat through the pipe wall of the heating branch pipe 310, thereby increasing the heat exchange area of the gas and improving the heat exchange efficiency of the gas, ensuring that the gas temperature is increased, and ensuring that the gas can reach the preset temperature in a short time even when the gas flow rate is large, and ensuring that the gas temperature is increased and the sensible heat is increased.

[0056] In the embodiment, the heating branch pipe 310 is provided with two heating branch pipes which are arranged at intervals along the front-rear direction, so as to avoid interference of the heating branch pipe 310 with the normal production of the kiln tail 110.

[0057] It can be understood that the energy-saving furnace kiln extends along the left-right direction, and the kiln head is located on the left side of the kiln tail 110. The straight-through pipe 230 and the gas outlet pipe 240 both extend along the left-right direction, thereby reducing the damage of the gas pipe 200. The conveying direction of the gas is from right to left, that is, the straight-through pipe 230 is connected to the left end of the gas inlet pipe 220.

[0058] It can be understood that, since the heating pipe 300 includes the first connecting pipe 320 and the second connecting pipe 330, two ends of the two heating branch pipes 310 connected in parallel are connected with the first connecting pipe 320 and the second connecting pipe 330 respectively, the other end of the first connecting pipe 320 is connected between the gas inlet pipe 220 and the straight-through pipe 230, and the other end of the second connecting pipe 330 is connected between the straight-through pipe 230 and the gas outlet pipe 240.

[0059] In this way, the gas flowing into the heating pipe 300 flows through the first connecting pipe 320, one of the heating branch pipes 310 and the second connecting pipe 330 in sequence, and then flows to the gas outlet pipe 240.

[0060] It can be understood that the plurality of heating branch pipes 310 located in the cavity 111 extend along the left-right direction, and in the projection in the left-right direction, the first connecting pipe 320 and the second connecting pipe 330 have the same C-shaped structure. Taking the first connecting pipe 320 as an example, the upper part of the first connecting pipe 320 extends backward and is connected with the gas pipe 200, the middle part of the first connecting pipe 320 extends along the up-down direction, and the lower part of the first connecting pipe 320 extends backward and is connected with the right ends of the plurality of heating branch pipes 310.

[0061] It can be understood that the gas outlet pipe 240 is sleeved with a first heat preservation layer, which is used for heat preservation of high-temperature gas in the gas outlet pipe 240, so as to reduce heat loss of the high-temperature gas during transportation.

[0062] Similarly, the heating pipe 300 has a pipe segment connected with the gas outlet pipe 240 and extending out of the cavity 111, the pipe segment is sleeved with a second heat preservation layer, and the pipe segment is the second connecting pipe 330 extending out of the cavity 111, that is, the second connecting pipe 330 extending out of the cavity 111 is sleeved with the second heat preservation layer, so as to reduce heat loss of the high-temperature gas.

[0063] In the embodiment, the first heat preservation layer and the second heat preservation layer each include a cotton tube and a polished aluminum skin. Taking the gas outlet pipe 240 as an example, the cotton tube is sleeved on the outer wall of the gas outlet pipe 240 and is fixed by winding with aluminum foil tape, and the polished aluminum skin with a thickness of 0.3 mm is sleeved on the cotton tube, so as to further heat preservation and heat insulation and make the energy-saving furnace 100 more beautiful.

[0064] It can be understood that the gas inlet pipe 220 is provided with a pressure adjusting mechanism, which includes first and second pressure sensors 510 and 530, a flow meter 550 and a pressure reducing valve 520 arranged in sequence along the gas flow direction, as shown in Figs. Figure 1 and Figure 2 The first and second pressure sensors 510 and 530 are respectively used for detecting the gas pressure before and after the pressure reducing valve 520 reduces the pressure. The flow meter 550 is used for detecting the flow of the gas. The pressure reducing valve 520 is used for reducing the pressure of the gas input into the gas inlet pipe 220, so as to ensure stable transportation of the gas after pressure reduction.

[0065] It can be understood that the pressure reducing valve 520 is adjusted according to the gas pressure detected by the first pressure sensor 510 and the gas flow detected by the flow meter 550, so that the gas pressure detected by the second pressure sensor 530 reaches the preset pressure, ensuring that the gas is safely and stably supplied to the burner, avoiding the situation that the high-pressure gas is heated, the in-pipe gas pressure in the gas pipe 200 and the heating pipe 300 increases sharply and exceeds the pressure limit of the pipeline, and the gas pipe 200 and the heating pipe 300 burst and leak.

[0066] In the embodiment, the first pressure sensor 510 is a high-pressure diaphragm box pressure gauge, and the second pressure sensor 530 is a low-pressure diaphragm box pressure gauge.

[0067] It can be understood that the gas filter 540 is arranged between the first pressure sensor 510 and the flow meter 550, as shown in Figure 1 and Figure 2 The gas filter 540 is used to filter impurities and pollutants in the gas, to ensure the purity and safety of the gas.

[0068] It can be understood that the gas inlet pipe 220 is also provided with a diffuser valve 400, which is arranged between the pressure reducing valve 520 and the second pressure sensor 530, as shown in Figure 1 and Figure 2 When the gas pressure exceeds the set value of the diffuser valve 400 after the pressure reducing valve 520 reduces the pressure, the diffuser valve 400 automatically diffuses part of the gas to keep the gas pressure in the gas inlet pipe 220 within a safe value, avoiding the situation that the gas output from the gas inlet pipe 220 is overpressure, causing the in-pipe gas pressure of the straight-through pipe 230 and the heating pipe 300 to be too high, and accidents such as pipe burst and gas leakage.

[0069] Further, the gas inlet pipe 220 is also provided with a plurality of pressure measuring nozzles 560, as shown in Figure 1 and Figure 2 In the embodiment, the pressure measuring nozzles 560 are three and are arranged between the flow meter 550 and the gas filter 540, between the flow meter 550 and the pressure reducing valve 520, and between the pressure reducing valve 520 and the diffuser valve 400.

[0070] It can be understood that the first and second switch valves 610 and 620 are arranged at the two ends of the gas inlet pipe 220 along the gas flow direction, that is, the first switch valve 610 is arranged at the gas inlet end of the gas inlet pipe 220 and is used to control the gas entering the gas pipe 200. The second switch valve 620 is arranged at the gas outlet end of the gas inlet pipe 220 and is located between the diffuser valve 400 and the second pressure sensor 530, and is used to control whether the gas is input into the straight-through pipe 230 and the heating pipe 300, as shown in Figure 1 and Figure 2The first switch valve 610 and the second switch valve 620 are used for improving the safety of the gas pipe 200, so that the gas supply can be stopped in time when an accident occurs.

[0071] It can be understood that the heating pipe 300 is provided with a third switch valve 630 and a fourth switch valve 640 at two ends along the gas flow direction. Specifically, the third switch valve 630 is located on the first connecting pipe 320 of the outlet cavity 111, and the fourth switch valve 640 is located on the second connecting pipe 330 of the outlet cavity 111, as shown in Figure 1 and Figure 3 The third switch valve 630 is used for controlling whether the gas enters the heating pipe 300, and the fourth switch valve 640 is used for controlling whether the heated high-temperature gas enters the outlet pipe 240. The third switch valve 630 and the fourth switch valve 640 are used for improving the safety of the heating pipe 300, so that the gas delivery of the heating pipe 300 and the output of the high-temperature gas can be stopped in time.

[0072] In the embodiment, the first switch valve 610, the third switch valve 630 and the fourth switch valve 640 are all manual valves. The second switch valve 620 is an electromagnetic valve, which is controlled by energization.

[0073] It can be understood that the gas inlet end of the gas inlet pipe 220 is provided with an expansion joint 700, as shown in Figure 1 and Figure 2 The end of the heating pipe 300 connected to the outlet pipe 240 is provided with an expansion joint 700, that is, the second connecting pipe 330 is provided with an expansion joint 700, and the expansion joint 700 is located at the lower end of the fourth switch valve 640, as shown in Figure 3 and Figure 6 The expansion joint 700 is a flexible element that effectively compensates for axial deformation. The expansion joint 700 at the gas inlet pipe 220 can reduce the temperature difference stress of the gas inlet pipe 220 and the gas inlet pipeline. The expansion joint 700 of the second connecting pipe 330 can reduce the temperature difference stress caused by the high-temperature gas when the second connecting pipe 330 extends out of the cavity 111, thereby avoiding the strength damage, instability damage and pull-out damage of the gas pipe 200 and the heating pipe 300.

[0074] It can be understood that the expansion joint 700 is made of stainless steel, so that the expansion joint 700 is firm and durable.

[0075] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An energy efficient furnace, characterized by, The kiln tail comprises a cavity. The gas pipe is located outside the kiln tail and is used for conveying gas. The heating pipe is located in the cavity, and two ends of the heating pipe extend out of the kiln tail and are connected in parallel with the gas pipe, so that the gas conveyed by the gas pipe can be shunted into the heating pipe. The gas pipe is provided with a control valve located between the two connection ends of the gas pipe and the heating pipe.

2. The energy efficient furnace of claim 1, wherein, The gas pipe comprises a gas inlet pipe, a straight-through pipe and a gas outlet pipe connected in sequence, the straight-through pipe and the heating pipe are connected in parallel, and the control valve is located in the straight-through pipe.

3. The energy efficient furnace of claim 2, wherein, The gas outlet pipe is provided with a temperature sensor, and the control valve is configured to adjust the gas flow of the straight-through pipe according to the gas temperature detected by the temperature sensor, so that the gas temperature reaches a preset temperature.

4. The energy efficient furnace of claim 3, wherein, The heating pipe comprises a plurality of heating branch pipes connected in parallel and located in the cavity.

5. The energy efficient furnace of claim 1, wherein, The gas outlet pipe is provided with a first heat preservation layer, and the heating pipe has a pipe segment connected with the gas outlet pipe and extending out of the cavity, and the pipe segment is provided with a second heat preservation layer.

6. The energy efficient furnace of claim 3, wherein, The gas inlet pipe is provided with a first pressure sensor, a flow meter, a pressure reducing valve and a second pressure sensor in sequence along the flow direction of the gas, and the pressure reducing valve is configured to adjust the gas pressure in the gas inlet pipe according to the gas pressure detected by the first pressure sensor and the gas flow detected by the flow meter, so that the gas pressure reaches a preset pressure.

7. The energy efficient furnace of claim 3, wherein The gas inlet pipe is also provided with a diffusion valve located between the pressure reducing valve and the second pressure sensor.

8. The energy efficient furnace of claim 7, wherein, The gas inlet pipe is provided with a first switch valve and a second switch valve at two ends along the flow direction of the gas respectively, and the heating pipe is provided with a third switch valve and a fourth switch valve at two ends along the flow direction of the gas respectively.

9. The energy efficient furnace of claim 3, wherein, The gas inlet end of the gas inlet pipe and one end of the gas outlet pipe connected with the heating pipe are respectively provided with expansion joints.

10. The energy efficient furnace of claim 3, wherein, ​

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