Combustion boiler

Abstract

The utility model discloses a combustion boiler which comprises a boiler body, a water tank, an air inlet device and an air exhaust device, a combustion chamber is arranged in the boiler body, and a combustor is arranged on the side wall of the combustion chamber. A heat exchange pipeline is arranged in the water tank, the air inlet end of the heat exchange pipeline communicates with the combustion chamber, and the air outlet end of the heat exchange pipeline extends out of the water tank. The gas inlet device comprises a gas mixing chamber, a gas pipeline, an air pipeline and a gas conveying pipeline, the gas outlet end of the gas pipeline communicates with the front side of the gas mixing chamber, the gas outlet end of the air pipeline communicates with the front side of the gas mixing chamber, the gas inlet end of the gas conveying pipeline communicates with the rear side of the gas mixing chamber, and the gas outlet end of the gas conveying pipeline is connected with the combustor; the exhaust device comprises a preheating pipeline, the gas inlet end of the preheating pipeline is connected with the gas outlet end of the heat exchange pipeline, the gas conveying pipeline penetrates through the preheating pipeline, and the gas outlet end of the preheating pipeline is connected with a tail gas treatment device. According to the combustion boiler, waste heat of waste gas can be used for preheating mixed gas, and the utilization rate of the waste gas is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler combustion equipment, in particular to a combustion boiler. Background Art

[0002] The boiler is an indispensable equipment in many production processes that require steam. It burns fuel to evaporate steam for production. In the process of steam production, the combustion conditions of the boiler have a very significant impact on the generation of steam and the utilization rate of fuel. It can be concluded from the Arrhenius law that the higher the absolute temperature, the faster the chemical reaction in the boiler. Therefore, when air is introduced into the boiler, the air must be heated to improve the combustion efficiency. In the prior art, it is usually through external heating, using an air preheater to preheat the air entering the boiler, thereby improving the combustion efficiency, but this method requires the consumption of fuel again, resulting in high energy consumption and high cost. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a combustion boiler that can use the waste heat of the exhaust gas generated by the combustion of the boiler to preheat the mixed gas entering the burner without consuming fuel again, thereby improving the utilization rate of the exhaust gas and reducing costs.

[0004] A combustion boiler according to the utility model comprises a boiler body, a water tank, an air intake device and an exhaust device, wherein a combustion chamber is arranged in the boiler body, and a burner is installed on the side wall of the combustion chamber; the water tank is connected to the boiler body, a heat exchange pipe is arranged inside the water tank, the air intake end of the heat exchange pipe is connected to the combustion chamber, and the air outlet end of the heat exchange pipe extends out of the water tank; the air intake device comprises an air mixing chamber, a gas pipeline, an air pipeline and a gas transmission pipeline, the air intake end of the gas pipeline is connected to a gas source, the air outlet end of the gas pipeline is connected to the front side of the air mixing chamber, the air intake end of the air pipeline is connected to a fan, the air outlet end of the air pipeline is connected to the front side of the air mixing chamber, the air intake end of the air transmission pipeline is connected to the rear side of the air mixing chamber, and the air outlet end of the gas transmission pipeline is connected to the burner; the exhaust device comprises a preheating pipeline, the air intake end of the preheating pipeline is connected to the air outlet end of the heat exchange pipeline, the gas transmission pipeline is arranged in the preheating pipeline, and the air outlet end of the preheating pipeline is connected to an exhaust gas treatment device.

[0005] According to the above embodiments of the utility model, at least the following beneficial effects are achieved:

[0006] The combustion boiler provided by the embodiment of the utility model is provided with a mixing chamber, so that the gas entering the mixing chamber through the gas pipeline and the air entering the mixing chamber through the air pipeline can be pre-mixed to obtain a mixed gas, and the mixed gas enters the burner through the gas pipeline to burn the fuel, and the gas generated by the combustion heats the water in the water tank through the heat exchange pipeline; by providing a preheating pipeline, the exhaust gas after completing the heat exchange with the water enters the preheating pipeline, and because the gas pipeline is penetrated through the preheating pipeline, the waste heat of the exhaust gas can preheat the mixed gas in the gas pipeline, thereby improving the combustion efficiency of the mixed gas, and there is no need to consume fuel for preheating again, thereby improving the utilization rate of the exhaust gas and reducing the cost.

[0007] According to some embodiments of the present invention, the gas pipeline passes through the preheating pipeline and extends along the length direction of the preheating pipeline. The outer wall of the gas pipeline is provided with a plurality of heat exchange fins, and the plurality of heat exchange fins are evenly spaced along the axial direction of the gas pipeline.

[0008] According to some embodiments of the utility model, the exhaust gas treatment device includes a condenser, a desulfurization tower and a chimney, the preheating pipe is connected to the condenser and the desulfurization tower in sequence through a first pipe, and the desulfurization tower is connected to the chimney through a second pipe.

[0009] According to some embodiments of the utility model, the exhaust gas treatment device also includes a circulation pipe, the air inlet end of the circulation pipe is connected to the second pipe, the air outlet end of the circulation pipe is connected to the front side of the mixing chamber, and the circulation pipe is provided with a one-way valve.

[0010] According to some embodiments of the present invention, the heat exchange pipe is a serpentine coil.

[0011] According to some embodiments of the present utility model, the gas pipeline is provided with a stop valve.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 It is a schematic diagram of the structure of a combustion boiler in some embodiments of the utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3yes Figure 1 Enlarged view of point B in the middle.

[0017] Wherein, the reference numerals are:

[0018] Boiler body 100; combustion chamber 110; burner 120;

[0019] Water tank 200; heat exchange pipe 210;

[0020] Gas mixing chamber 310; gas pipeline 320; stop valve 321; air pipeline 330; fan 331; gas pipeline 340; heat exchange fin 341;

[0021] Preheating pipeline 400;

[0022] Condenser 510; desulfurization tower 520; chimney 530; first pipeline 540; second pipeline 550; circulation pipeline 560; one-way valve 561. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1According to the utility model, a combustion boiler includes a boiler body 100, a water tank 200, an air intake device and an exhaust device. A combustion chamber 110 is arranged in the boiler body 100, and a burner 120 is installed on the side wall of the combustion chamber 110; the water tank 200 is connected to the boiler body 100, and a heat exchange pipe 210 is arranged inside the water tank 200. The air intake end of the heat exchange pipe 210 is connected to the combustion chamber 110, and the air outlet end of the heat exchange pipe 210 extends out of the water tank 200; the air intake device includes a gas mixing chamber 310, a gas pipeline 320, an air pipeline 330 and a gas transmission pipeline 340, and the gas pipeline 320 The air inlet end is connected to the gas source, the air outlet end of the gas pipeline 320 is connected to the front side of the mixing chamber 310, the air inlet end of the air pipeline 330 is connected to the fan 331, the air outlet end of the air pipeline 330 is connected to the front side of the mixing chamber 310, the air inlet end of the gas pipeline 340 is connected to the rear side of the mixing chamber 310, and the air outlet end of the gas pipeline 340 is connected to the burner 120; the exhaust device includes a preheating pipeline 400, the air inlet end of the preheating pipeline 400 is connected to the air outlet end of the heat exchange pipeline 210, the gas pipeline 340 is penetrated in the preheating pipeline 400, and the air outlet end of the preheating pipeline 400 is connected to the exhaust gas treatment device.

[0028] Specifically, the combustion boiler provided in the embodiment of the utility model is provided with a mixing chamber 310, so that the gas entering the mixing chamber 310 through the gas pipeline 320 and the air entering the mixing chamber 310 through the air pipeline 330 can be pre-mixed to obtain a mixed gas, and the mixed gas enters the burner 120 through the gas pipeline 340 to burn the fuel, and the gas generated by the combustion heats the water in the water tank 200 through the heat exchange pipeline 210; by providing a preheating pipeline 400, the exhaust gas after completing the heat exchange with the water enters the preheating pipeline 400, and since the gas pipeline 340 is penetrated in the preheating pipeline 400, the waste heat of the exhaust gas can preheat the mixed gas in the gas pipeline 340, thereby improving the combustion efficiency of the mixed gas, and there is no need to consume fuel for preheating again, thereby improving the utilization rate of the exhaust gas and reducing the cost.

[0029] Further, see Figure 1 and Figure 2 According to some embodiments of the present invention, the gas pipeline 340 passes through the preheating pipeline 400 and extends along the length direction of the preheating pipeline 400. The outer wall of the gas pipeline 340 is provided with a plurality of heat exchange fins 341, and the plurality of heat exchange fins 341 are evenly spaced along the axial direction of the gas pipeline 340.

[0030] It is understandable that in order to increase the contact area between the exhaust gas and the gas pipeline 340 to improve the heat exchange efficiency of the exhaust gas, the embodiment of the utility model preferably allows the gas pipeline 340 to extend along the length direction of the preheating pipeline 400, and at the same time allows the gas pipeline 340 to be located inside the preheating pipeline 400, that is, the preheating pipeline 400 can wrap the gas pipeline 340, thereby increasing the contact area between the exhaust gas and the gas pipeline 340 and improving the heat exchange efficiency of the exhaust gas. On the other hand, by providing a plurality of heat exchange fins 341 on the outer wall of the gas pipeline 340, the heat exchange efficiency of the exhaust gas can be further improved, the utilization rate of the waste heat of the exhaust gas is improved, and the combustion efficiency of the mixed gas is effectively improved.

[0031] Specifically, refer to Figure 1 According to some embodiments of the utility model, the exhaust gas treatment device includes a condenser 510 for cooling exhaust gas, a desulfurization tower 520 for desulfurization and dust removal of exhaust gas, and a chimney 530 for exhaust gas discharge. The preheating pipeline 400 connects the condenser 510 and the desulfurization tower 520 in sequence through a first pipeline 540, and the desulfurization tower 520 is connected to the chimney 530 through a second pipeline 550.

[0032] Further, see Figure 1 and Figure 3 According to some embodiments of the present invention, the exhaust gas treatment device also includes a circulation pipe 560, the air inlet end of the circulation pipe 560 is connected to the second pipe 550, the air outlet end of the circulation pipe 560 is connected to the front side of the mixing chamber 310, and the circulation pipe 560 is provided with a one-way valve 561.

[0033] Specifically, by passing part of the exhaust gas into the mixing chamber 310 to mix with the fuel gas and air, the oxygen concentration of the mixed gas can be reduced, thereby reducing the nitrogen oxides generated by the combustion of the mixed gas. The circulation pipe 560 is provided with a one-way valve 561 to prevent the exhaust gas from flowing back or the mixed gas in the mixing chamber 310 from entering the third pipe through the circulation pipe 560.

[0034] Preferably, refer to Figure 1 According to some embodiments of the present invention, the heat exchange pipe 210 is a serpentine coil, which can improve the heat exchange efficiency.

[0035] Preferably, refer to Figure 1 According to some embodiments of the present invention, the gas pipeline 320 is provided with a stop valve 321 for cutting off the delivery of the gas.

[0036] In the embodiment of the utility model, the connecting member may be a clip or a plate of other shapes, and the connection method may be a snap connection, a screw connection or a welding method, which will not be described in detail here.

[0037] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A combustion boiler, characterized in that: include: A boiler body, wherein a combustion chamber is arranged in the boiler body, and a burner is installed on a side wall of the combustion chamber; A water tank connected to the boiler body, wherein a heat exchange pipe is arranged inside the water tank, an air inlet end of the heat exchange pipe is connected to the combustion chamber, and an air outlet end of the heat exchange pipe extends out of the water tank; An air intake device, comprising an air mixing chamber, a gas pipeline, an air pipeline and a gas delivery pipeline, wherein the air intake end of the gas pipeline is connected to a gas source, the air outlet end of the gas pipeline is connected to the front side of the air mixing chamber, the air intake end of the air pipeline is connected to a fan, the air outlet end of the air pipeline is connected to the front side of the air mixing chamber, the air intake end of the gas delivery pipeline is connected to the rear side of the air mixing chamber, and the air outlet end of the gas delivery pipeline is connected to the burner; The exhaust device comprises a preheating pipeline, the air inlet end of the preheating pipeline is connected to the air outlet end of the heat exchange pipeline, the gas transmission pipeline is passed through the preheating pipeline, and the air outlet end of the preheating pipeline is connected to the exhaust gas treatment device.

2. The combustion boiler according to claim 1, characterized in that: The gas pipeline passes through the preheating pipeline and extends along the length direction of the preheating pipeline. The outer wall of the gas pipeline is provided with a plurality of heat exchange fins, and the plurality of heat exchange fins are evenly spaced along the axial direction of the gas pipeline.

3. The combustion boiler according to claim 1, characterized in that: The tail gas treatment device comprises a condenser, a desulfurization tower and a chimney. The preheating pipeline is connected to the condenser and the desulfurization tower in sequence through a first pipeline, and the desulfurization tower is connected to the chimney through a second pipeline.

4. The combustion boiler according to claim 3, characterized in that: The exhaust gas treatment device further comprises a circulation pipeline, the air inlet end of the circulation pipeline is connected to the second pipeline, the air outlet end of the circulation pipeline is connected to the front side of the mixing chamber, and the circulation pipeline is provided with a one-way valve.

5. The combustion boiler according to claim 1, characterized in that: The heat exchange pipe is a serpentine coil.

6. The combustion boiler according to claim 1, characterized in that: The gas pipeline is provided with a stop valve.

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