Environment-friendly heating furnace with high-efficiency burner

Abstract

The application relates to an environment-friendly heating furnace with a high-efficiency burner, which comprises a hollow furnace body, a high-efficiency burner arranged below the furnace body and communicated with the furnace body and used for burning and heating the inside of the furnace body, and a connecting flue, one end of which is assembled on the furnace body and communicated with the furnace body, and the connecting flue is sequentially provided with an SCR reaction chamber and an air preheating chamber along the flue gas discharging direction. The high-efficiency burner is adopted to ensure the combustion efficiency of the furnace body, the SCR reaction chamber capable of catalyzing and reducing nitrogen oxides in flue gas is arranged, nitrogen oxides in flue gas are reduced, heat in flue gas is conducted into the air preheating chamber in a heat conduction mode, the temperature of air entering the high-efficiency burner is increased, and the combustion efficiency of the high-efficiency burner is further ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of heating furnaces, in particular to an environment-friendly heating furnace adopting a high-efficiency burner. BACKGROUND

[0002] The pipe heating furnace is mainly used for process heating furnaces in petroleum refining, petrochemical and chemical and chemical fiber industries.

[0003] The pipe heating furnace is characterized in that:

[0004] 1. The heated substances flow in the pipe, so it is limited to heating gas or liquid, and these liquids are usually flammable and explosive hydrocarbon substances, which are dangerous and have harsh operating conditions;

[0005] 2. The heating mode of burning liquid or gas fuel directly heats the materials in the heating pipe;

[0006] 4. Long-period continuous operation without interruption.

[0007] The existing heating furnace adopts a low-nitrogen burner to reduce the emission of nitrogen oxides generated during heating, but the main mechanism of the low-nitrogen burner is to reduce the oxygen concentration of the ignition zone while reducing the combustion temperature to inhibit the generation of nitrogen oxides.

[0008] In addition, there is a selective catalytic reduction technology (Selective Catalytic Reduction, SCR for short) which is a widely used technology for industrial flue gas denitrification. Its core is to convert nitrogen oxides (NOx) into harmless nitrogen (N2) and water (H2O) through catalytic reduction reaction, thereby effectively controlling the emission of nitrogen oxides.

[0009] Due to the weak combustion capacity of the low-nitrogen burner, if the temperature of the air entering the burner is low, the combustion efficiency of the entire burner will be reduced, thereby reducing the heating efficiency. CONTENT OF THE INVENTION

[0010] The application provides an environment-friendly heating furnace adopting a high-efficiency burner, which can reduce the emission of nitrogen oxides and ensure that the device is not affected by low-temperature air to reduce the heating efficiency.

[0011] The technical scheme of the application is as follows: an environment-friendly heating furnace adopting a high-efficiency burner, comprising:

[0012] The furnace body is hollow inside;

[0013] A connecting flue is assembled on the furnace body and communicates with the furnace body, and an SCR reaction chamber and an air preheating chamber are arranged in the connecting flue in sequence along the direction of flue gas discharge, and the SCR reaction chamber is used for absorbing nitrogen oxides in flue gas.

[0014] A high-efficiency burner is arranged below the furnace body and communicates with the furnace body, and is used for burning and heating the inside of the furnace body, and the high-efficiency burner communicates with the air preheating chamber, and the air preheating chamber is used for guiding preheated air into the high-efficiency burner to improve the combustion efficiency.

[0015] By using the above scheme, the combustion efficiency of the furnace body is ensured by using the high-efficiency burner, and the SCR reaction chamber capable of catalyzing and reducing nitrogen oxides in flue gas is arranged to reduce nitrogen oxides in flue gas, and the heat in flue gas is conducted to the air preheating chamber by using the heat conduction mode to improve the temperature of air entering the high-efficiency burner, and the combustion efficiency of the high-efficiency burner is further ensured.

[0016] In an embodiment of the present application, the furnace body comprises:

[0017] A radiation chamber is internally provided with a radiation support arranged circumferentially along the radiation chamber, and the radiation support is provided with a radiation pipeline, and one end of the radiation pipeline communicates with a material outlet pipeline arranged on one side of the upper end of the radiation chamber.

[0018] A convection chamber is internally provided with a convection pipeline assembly, and one side of the convection chamber is provided with a material inlet pipeline, and one end of the convection pipeline assembly communicates with the other end of the radiation pipeline, and the other end communicates with the material inlet pipeline.

[0019] In an embodiment of the present application, the radiation pipeline is a vertically and reversely arranged serpentine pipeline.

[0020] In an embodiment of the present application, the convection pipeline assembly comprises:

[0021] A convection support is arranged on the inner wall of the convection chamber.

[0022] A plurality of groups of convection heating pipelines are arranged in sequence and at intervals along the direction of flue gas discharge, and are fixedly assembled on the convection support, and the plurality of groups of convection heating pipelines communicate with each other.

[0023] In an embodiment of the present application, the convection heating pipeline is a horizontally arranged serpentine pipeline.

[0024] By adopting the above scheme, the heat generated during combustion can directly heat the material in the pipeline in a radiative manner in the radiation chamber, and the high-temperature flue gas passes through the convection heating pipe in the convection chamber after the first heating, so that the material can be preheated before entering the radiation chamber, thereby improving the heating effect of the material in the pipeline.

[0025] In one embodiment of the present application, the SCR reaction chamber is in communication with the connecting flue, one side of the SCR reaction chamber is provided with an ammonia gas input pipe, the inside of the SCR reaction chamber is provided with a fixing frame, and a catalyst in a perforated plate structure is arranged on the fixing frame and perpendicular to the flue gas discharge direction.

[0026] By adopting the above scheme, when the flue gas in the connecting flue enters the SCR reaction chamber, the nitrogen oxides in the flue gas mixed with the input ammonia gas are subjected to a catalytic reduction reaction by the catalyst in the SCR reaction chamber, thereby converting the nitrogen oxides in the flue gas into harmless nitrogen gas and discharging it, thereby improving the environmental protection performance of the device.

[0027] In one embodiment of the present application, the connecting flue penetrates the air preheating chamber, the air preheating chamber is provided with an air input pipe and an air output pipe on both sides and in communication with the air preheating chamber, and the air preheating chamber is provided with a heat exchange pipe inside, which is assembled and attached to the outside of the connecting flue and arranged in a spiral shape along the circumference of the connecting flue, and the two ends of the heat exchange pipe are in communication with the air input pipe and the air output pipe, respectively.

[0028] In one embodiment of the present application, the environmentally friendly heating furnace with a high-efficiency burner further comprises a chimney, which is assembled on the other end of the connecting flue and in communication with the connecting flue.

[0029] In one embodiment of the present application, the high-efficiency burner is respectively provided with an air inlet pipe and a fuel inlet pipe, the air inlet pipe is in communication with the air output pipe, the fuel inlet pipe is provided with an electric control valve, and the fuel inlet pipe is used to supply fuel to the high-efficiency burner.

[0030] By adopting the above scheme, by setting the air preheating chamber, air is blown into the air input pipe, and the remaining heat in the flue gas can enter the heat exchange pipe through conduction by using the spiral heat exchange pipe attached to the connecting flue, so that the air forms a vortex during transportation, thereby increasing the heat exchange efficiency and preheating the air mixed into the high-efficiency burner.

[0031] In one embodiment of the present application, the environmentally friendly heating furnace with high-efficiency burner further comprises three groups of temperature sensors, which are respectively arranged on the material outlet pipeline, the SCR reaction chamber and the air outlet pipeline, and are electrically connected with the electric control valve.

[0032] By arranging the temperature sensors on the material outlet pipeline, the SCR reaction chamber and the air outlet pipeline respectively, the device can sense the material temperature, the temperature of the reacted flue gas and the temperature of the preheated air respectively, and determine whether the temperature reaches the preset value, so as to adjust the fuel consumption of the high-efficiency burner.

[0033] In summary, the present application has at least one of the following beneficial technical effects:

[0034] 1. By arranging the SCR reaction chamber to reduce the nitrogen oxides in the flue gas, and using the heat conduction method to conduct the heat in the flue gas to the air preheating chamber to increase the air temperature entering the high-efficiency burner, the heat energy utilization rate is improved, and the combustion efficiency of the high-efficiency burner is further ensured.

[0035] 2. By arranging the spiral heat exchange pipe, the air forms vortex when passing through the heat exchange pipe, which increases the heat exchange efficiency of the air flow, and the heat energy in the flue gas can enter the device air faster and more efficiently, and the air preheating efficiency is improved.

[0036] 3. By detecting the material temperature, the temperature of the reacted flue gas and the preheated air respectively, and taking the material temperature as the main control signal and the temperature of the reacted flue gas and the preheated air as the secondary control signal as the basis for judging the fuel input, the fuel input is adjusted, the cascade control of the high-efficiency burner is realized, and the fluctuation of the high-efficiency burner is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a front view of an environmentally friendly heating furnace with high-efficiency burner provided in an embodiment of the present application;

[0038] Figure 2 is a furnace body plane schematic view of an environmentally friendly heating furnace with high-efficiency burner provided in an embodiment of the present application;

[0039] Figure 3 is a furnace body top view of an environmentally friendly heating furnace with high-efficiency burner provided in an embodiment of the present application;

[0040] Figure 4 is a sectional view of an air preheating chamber of an environmentally friendly heating furnace with high-efficiency burner provided in an embodiment of the present application;

[0041] Figure 5 is a plan view of an SCR reaction chamber of an environmentally-friendly heating furnace with a high-efficiency burner provided in an embodiment of the present application.

[0042] BRIEF DESCRIPTION OF DRAWINGS 1, furnace body; 11, radiation chamber; 111, material outlet pipeline; 112, radiation pipeline; 113, radiation support; 12, convection chamber; 121, material inlet pipeline; 122, convection pipeline assembly; 1221, convection heating pipe; 1222, convection support; 2, connecting flue; 21, SCR reaction chamber; 211, ammonia gas input pipeline; 212, fixing frame; 213, catalyst; 22, air preheating chamber; 221, air input pipeline; 222, air output pipeline; 223, heat exchange pipe; 3, high-efficiency burner; 31, fuel inlet pipe; 311, electric control valve; 32, air inlet pipe; 4, chimney; 5, temperature sensor. DETAILED DESCRIPTION

[0043] The above description is made in conjunction with the accompanying drawings Figures 1-5 An environmentally-friendly heating furnace with a high-efficiency burner provided in the present application is described in further detail.

[0044] Please refer to Figure 1 The environmentally-friendly heating furnace with a high-efficiency burner provided in an embodiment of the present application comprises a hollow furnace body 1, a connecting flue 2 and a high-efficiency burner 3. The connecting flue 2 is assembled on the furnace body 1 at one end and communicates with the furnace body 1. The SCR reaction chamber 21 and the air preheating chamber 22 are sequentially arranged on the connecting flue 2 along the direction of flue gas discharge. The SCR reaction chamber 21 is used for absorbing nitrogen oxides of flue gas. The high-efficiency burner 3 is arranged below the furnace body 1 and communicates with the furnace body 1, used for burning and heating the inside of the furnace body 1. The high-efficiency burner 3 communicates with the air preheating chamber 22. The air preheating chamber 22 is used for guiding preheated air into the high-efficiency burner 3 to improve the combustion efficiency. By arranging the high-efficiency burner 3, the nitrogen oxides conversion of flue gas generated by the high-efficiency burner 3 is realized by the SCR reaction chamber 21, which further guarantees the environmental friendliness and can further preheat air by using the heat of flue gas.

[0045] In the present embodiment, compared with ordinary or low-nitrogen burners, the high-efficiency burner 3 directly sprays gas into the firepot brick by a high-precision gas injection system, ignites at the same time, adjusts the time of air intake and exhaust, optimizes the air flow distribution in the firepot brick, and can make more than 80% of the fuel concentrated in the combustion channel. The high-temperature flue gas formed by combustion is sprayed out at a high speed, so that the heat energy can be maximally transferred to the heated medium.

[0046] Please refer to Figure 2 The furnace body 1 comprises: a radiation chamber 11 and a convection chamber 12, the radiation chamber 11 is internally provided with a radiation support 113 arranged along the circumference of the radiation chamber 11, the radiation support 113 is provided with a radiation pipeline 112, one side of the upper end of the radiation chamber 11 is provided with a material outlet pipeline 111, one end of the radiation pipeline 112 is in communication with the material outlet pipeline 111, the convection chamber 12 is internally provided with a convection pipeline assembly 122, one side of the convection chamber 12 is provided with a material inlet pipeline 121, one end of the convection pipeline assembly 122 is in communication with the other end of the radiation pipeline 112, and the other end is in communication with the material inlet pipeline 121. The radiation pipeline 112 is a vertically and reversely arranged serpentine pipe. By arranging the serpentine pipe, the travel of the material in the furnace body 1 is lengthened, thereby prolonging the heating time of the material in the furnace body 1, and the device can efficiently heat the pipeline for transporting the material in the furnace body 1.

[0047] The convection pipeline assembly 122 comprises: a convection support 1222 and multiple groups of convection heating pipes 1221, the convection support 1222 is arranged on the inner wall of the convection chamber 12, multiple groups of the convection heating pipes 1221 are sequentially and spacedly arranged along the direction of smoke exhaust and are fixedly assembled on the convection support 1222, and multiple groups of the convection heating pipes 1221 are in communication with each other. The convection heating pipe 1221 is a horizontally arranged serpentine pipe. When the high-efficiency burner 3 is combusted and the pipeline for transporting the material is heated in the radiation chamber 11, the smoke generated by combustion moves upward, so that the smoke dust can pass through multiple groups of the convection heating pipes 1221, thereby delaying the speed of the smoke dust moving upward and allowing the smoke dust to have a longer heat exchange time.

[0048] Please refer to Figure 5 The SCR reaction chamber 21 is in communication with the connecting flue 2, one side of the SCR reaction chamber 21 is provided with an ammonia gas input pipeline 211, the interior of the SCR reaction chamber 21 is provided with a fixing frame 212, the fixing frame 212 is assembled with a catalyst 213 arranged perpendicularly to the direction of smoke exhaust, and the catalyst 213 is a porous plate structure. After the smoke containing nitrogen oxides enters the device SCR reaction chamber 21, the smoke is mixed with ammonia gas and passes through the catalyst 213. Under the action of the catalyst 213, the nitrogen oxides in the smoke can have a catalytic reduction reaction with the ammonia gas, so that the nitrogen oxides in the smoke are converted into harmless nitrogen and water, thereby ensuring the combustion efficiency of the device and improving the environmental friendliness of the device.

[0049] In this embodiment, the catalyst 213 can be a titanium dioxide component.

[0050] Please refer to Figure 4The connecting flue 2 penetrates the air preheating chamber 22, the air preheating chamber 22 is respectively provided with an air input pipeline 221 and an air output pipeline 222 in communication with the air preheating chamber 22 on both sides, the air preheating chamber 22 is internally provided with a heat exchange pipe 223, the heat exchange pipe 223 is fitted and attached to the outside of the connecting flue 2 and is arranged in a spiral shape along the circumference of the connecting flue 2, both ends of the heat exchange pipe 223 are respectively in communication with the air input pipeline 221 and the air output pipeline 222, and the environment-friendly heating furnace using the high-efficiency burner 3 further comprises a chimney 4, the chimney 4 is fitted on the other end of the connecting flue 2 and is in communication with the connecting flue 2. The flue gas after denitrification has a certain temperature, when entering the air preheating chamber 22, the heat exchange pipe 223 is tightly attached to the outside of the connecting flue 2 and is spirally fitted with the outside of the connecting flue 2, so that the air forms a vortex when moving in the heat exchange pipe 223, thereby improving the heat exchange efficiency of the air, and the heat in the connecting flue 2 can be transferred to the air, thereby preheating the air to be introduced into the high-efficiency burner 3, and improving the combustion efficiency of the high-efficiency burner 3.

[0051] Please refer to Figure 1 The high-efficiency burner 3 is respectively provided with an air inlet pipe 32 and a fuel inlet pipe 31, the air inlet pipe 32 is in communication with the air output pipeline 222, the fuel inlet pipe 31 is provided with an electric control valve 311, the fuel inlet pipe 31 is used to supply fuel to the high-efficiency burner 3, and the environment-friendly heating furnace using the high-efficiency burner 3 further comprises three groups of temperature sensors, the three groups of temperature sensors are respectively arranged on the material outlet pipeline 111, the SCR reaction chamber 21 and the air output pipeline 222, and the three groups of temperature sensors are electrically connected with the electric control valve 311. By arranging three groups of temperature sensors and arranging them on the material outlet pipeline 111, the SCR reaction chamber 21 and the air output pipeline 222 respectively, the temperature of the three can be monitored respectively, so that the fuel supplied to the high-efficiency burner 3 can be adjusted according to the temperature change.

[0052] In the embodiment, a controller (not shown) is arranged, the controller is connected with the temperature sensors and the electric control valve 311, and is used to control the opening degree of the electric control valve 311 according to the temperature signal, wherein the electrical connection mode between the three is an existing conventional technical means, so it is not described here.

[0053] In summary, when the device is burning, the high-efficiency burner 3 burns fuel and directly heats the material inside the radiation chamber 11, the flue gas produced by the burning moves upward and enters the SCR reaction chamber 21 for denitration reaction, the flue gas after denitration continues to rise to the air preheating chamber 22, and the heat exchange pipe 223 is used to exchange heat with the air, and the heated air enters the high-efficiency burner 3 to ensure the burning efficiency of the high-efficiency burner 3.

[0054] Wherein, temperature sensors are arranged in the material outlet pipeline 111, the SCR reaction chamber 21 and the air outlet pipeline 222 respectively, the temperature of the material outlet pipeline 111 is used as the main control signal, and the temperatures of the SCR reaction chamber 21 and the air outlet pipeline 222 are used as the secondary control signals;

[0055] When the material outlet temperature does not reach the specified value, the fuel consumption will be increased by adjusting the electric control valve 311;

[0056] When the air outlet temperature after the air preheater is detected to be high, it can be known that the enthalpy value of the air is brought into the fuel, and at this time the use of fuel can be reduced;

[0057] When the temperature of the SCR reaction chamber 21 is detected, if it is higher than the preset value, the fuel input will be reduced, and if it is lower than the preset value, the fuel consumption of the burner will be appropriately increased to realize the cascade control of the burner and reduce the fluctuation of the burner.

[0058] The above are the preferred embodiments of the present application, and are not used to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. An environmentally friendly heating furnace employing a high-efficiency burner, characterized in that, include: Hollow furnace body (1); A connecting flue (2) is provided. One end of the connecting flue (2) is mounted on the furnace body (1) and communicates with the furnace body (1). An SCR reaction chamber (21) and an air preheating chamber (22) are arranged sequentially on the connecting flue (2) along the flue gas discharge direction. The SCR reaction chamber (21) is used to absorb nitrogen oxides in the flue gas. A high-efficiency burner (3) is located below the furnace body (1) and communicates with the furnace body (1). It is used for combustion and to heat up the interior of the furnace body (1). The high-efficiency burner (3) is communicated with the air preheating chamber (22). The air preheating chamber (22) is used to introduce preheated air into the high-efficiency burner (3) to improve combustion efficiency.

2. The environmentally friendly heating furnace using a high-efficiency burner according to claim 1, characterized in that: The furnace body (1) includes: A radiation chamber (11) is provided inside the radiation chamber (11) with a radiation support (113) arranged around the periphery of the radiation chamber (11). A radiation pipe (112) is provided on the radiation support (113). A material outlet pipe (111) is provided on one side of the upper end of the radiation chamber (11). One end of the radiation pipe (112) is connected to the material outlet pipe (111). A convection chamber (12) is provided inside the convection chamber (12), and a material inlet pipe (121) is provided on one side of the convection chamber (12). One end of the convection pipe assembly (122) is connected to the other end of the radiation pipe (112), and the other end is connected to the material inlet pipe (121).

3. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 2, characterized in that: The radiating pipe (112) is a serpentine pipe arranged in a vertical direction.

4. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 2, characterized in that: The convection pipe assembly (122) includes: A convection support (1222) is disposed on the inner wall of the convection chamber (12); Multiple sets of convection heating tubes (1221) are arranged sequentially at intervals along the direction of flue gas discharge and fixedly mounted on the convection bracket (1222). The multiple sets of convection heating tubes (1221) are interconnected.

5. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 4, characterized in that: The convection heating tube (1221) is a horizontally arranged serpentine tube.

6. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 2, characterized in that: The SCR reaction chamber (21) is connected to the connecting flue (2). Ammonia input pipe (211) is provided on one side of the SCR reaction chamber (21). A fixing frame (212) is provided inside the SCR reaction chamber (21). A catalyst (213) is mounted on the fixing frame (212) and is arranged perpendicular to the flue gas discharge direction. The catalyst (213) has a porous plate structure.

7. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 2, characterized in that: The connecting flue (2) passes through the air preheating chamber (22). The air preheating chamber (22) has an air inlet pipe (221) and an air outlet pipe (222) connected to the air preheating chamber (22) on both sides. The air preheating chamber (22) has a heat exchange tube (223) inside. The heat exchange tube (223) is assembled and attached to the outside of the connecting flue (2) and is arranged in a spiral shape along the circumference of the connecting flue (2). The two ends of the heat exchange tube (223) are connected to the air inlet pipe (221) and the air outlet pipe (222) respectively.

8. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 1, characterized in that: The environmentally friendly heating furnace using a high-efficiency burner also includes a chimney (4), which is mounted on the other end of the connecting flue (2) and is connected to the connecting flue (2).

9. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 7, characterized in that: The high-efficiency burner (3) is provided with an air inlet pipe (32) and a fuel inlet pipe (31). The air inlet pipe (32) is connected to the air output pipe (222). The fuel inlet pipe (31) is provided with an electric control valve (311). The fuel inlet pipe (31) is used to supply fuel to the high-efficiency burner (3).

10. An environmentally friendly heating furnace employing a high-efficiency burner according to claim 9, characterized in that: The environmentally friendly heating furnace using a high-efficiency burner also includes three sets of temperature sensors. The three sets of temperature sensors are respectively installed on the material outlet pipe (111), the SCR reaction chamber (21), and the air output pipe (222). The three sets of temperature sensors are electrically connected to the electric control valve (311).

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