RDF combustion tail gas treatment device with waste heat recovery function

Abstract

The utility model discloses an RDF combustion tail gas treatment device with a waste heat recovery function, which comprises an RDF combustor, a connecting pipe, a waste heat recovery device and a return pipe, the top of the RDF combustor is fixedly connected with the connecting pipe, the other end of the connecting pipe is fixedly communicated with the waste heat recovery device, and the output end of the waste heat recovery device is fixedly connected with an exhaust pipe. Air is guided into the heat exchange mechanism in the low-temperature recovery chamber by starting the fan, heat exchange of cold air and hot air is achieved, secondary heat recovery is carried out, meanwhile, the air with the increased heat recovery temperature directly enters the RDF combustor through the backflow pipe to assist combustion, inlet air of equipment is preheated, the combustion efficiency is improved, and the energy consumption is reduced. Therefore, the device has the advantages that steam secondary efficient heat recovery is conducted on combustion tail gas, meanwhile, air needed by combustion is preheated through tail gas waste heat, and the combustion efficiency and the waste heat recovery rate are improved.

Description

Technical Field

[0001] This utility model relates to the field of RDF combustion exhaust gas, and more specifically, to an RDF combustion exhaust gas treatment device with waste heat recovery function. Background Technology

[0002] RDF burners are industrial combustion devices specifically designed for incinerating Refuse-Derived Fuel (RDF). By optimizing structure and technical parameters, they solve combustion problems of RDF fuel, such as high moisture content, numerous impurities, and large fluctuations in calorific value, achieving efficient and clean energy conversion. RDF burners are core equipment for solid waste energy conversion. Through customized design, they solve the problems of combustion stability and pollution control of waste fuel, and are promoting the green transformation of "replacing coal with waste" in the cement, power, and metallurgical industries.

[0003] While RDF combustion equipment generates energy through combustion, the exhaust gas produced by the combustion remains at a high temperature. Direct emission of this gas would result in the waste of internal energy as it is released into the air. Current exhaust gas waste heat recovery equipment can generally only recover heat in a single cycle, leaving a significant amount of heat remaining in the exhaust gas. Therefore, the recovery efficiency needs to be improved. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide an RDF combustion exhaust gas treatment device with waste heat recovery function.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] An RDF combustion exhaust gas treatment device with waste heat recovery function includes an RDF burner, a connecting pipe, a waste heat recovery device, and a return pipe. The top of the RDF burner is fixedly connected to the connecting pipe, and the other end of the connecting pipe is connected and fixedly connected to the waste heat recovery device. An exhaust pipe is fixedly connected to the output end of the waste heat recovery device. The waste heat recovery device is connected and fixedly connected to the air inlet end of the RDF burner via the return pipe. A PLC controller for operating the equipment is installed on the RDF burner.

[0007] The waste heat recovery device includes a high-temperature recovery chamber, a connecting pipe, a low-temperature recovery chamber, and a fan. The air inlet of the high-temperature recovery chamber is connected and fixed to the connecting pipe, and the exhaust end of the high-temperature recovery chamber is fixedly connected to the connecting pipe. The other end of the connecting pipe is connected and fixed to the air inlet of the low-temperature recovery chamber. The exhaust end of the low-temperature recovery chamber is connected and fixed to the exhaust pipe, and the air exhaust end of the low-temperature recovery chamber is connected and fixed to the return pipe. The fan is fixedly installed on the top of the low-temperature recovery chamber and guides air inward. The low-temperature air introduced by the fan is guided downward into the return pipe after heat exchange.

[0008] As a further description of the above technical solution: The high-temperature recovery chamber is fixedly connected with horizontally arranged and sequentially connected heat exchange spiral coils. The water inlet and drain ends of the heat exchange spiral coils pass through and are fixed to the high-temperature recovery chamber, and the water inlet and drain ends of the heat exchange spiral coils are connected to external water pipes.

[0009] As a further description of the above technical solution: a heat exchange block is fixedly connected inside the low-temperature recovery chamber, and the heat exchange block is provided with multiple vent holes. The exhaust gas paths of the low-temperature recovery chamber are isolated from each other, and the vent holes are used to guide the low-temperature air introduced by the fan to the return pipe at the bottom.

[0010] As a further description of the above technical solution: the heat exchange block includes multiple heat-conducting modules and multiple sets of heat-conducting fins. The heat-conducting modules and heat-conducting fins are arranged longitudinally at intervals and fixed inside the low-temperature recovery chamber, and the vent is set inside the heat-conducting modules.

[0011] As a further description of the above technical solution: the surface of the heat-conducting fins is provided with grooves arranged at equal intervals.

[0012] As a further description of the above technical solution: the interior of the high-temperature recovery chamber is equipped with a positioning support frame for supporting the heat exchange spiral coil.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] This scheme achieves the advantages of efficient secondary heat recovery of combustion exhaust gas by setting up a high-temperature recovery chamber and a low-temperature recovery chamber, combined with a reflux pipe combination, thereby enabling the device to perform high-efficiency secondary heat recovery of combustion exhaust gas and preheat the air required for combustion using the waste heat of the exhaust gas, thus improving combustion efficiency and waste heat recovery rate. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a frontal cross-sectional view of the present invention.

[0017] Figure 3 This is a schematic diagram of the right-side cross-sectional structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the left-side cross-sectional structure of this utility model.

[0019] Explanation of the labels in the diagram:

[0020] 1. RDF burner; 2. Connecting pipe; 3. Waste heat recovery device; 31. High temperature recovery chamber; 311. Heat exchange spiral coil; 32. Connecting pipe; 33. Low temperature recovery chamber; 331. Heat exchange block; 3311. Heat conduction module; 3312. Heat conduction fins; 3313. Groove; 332. Vent hole; 34. Fan; 4. Return pipe; 5. Exhaust pipe; 6. PLC controller; 7. Support frame. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model;

[0022] Please see Figures 1-4 In this utility model, the RDF combustion exhaust gas treatment device with waste heat recovery function includes an RDF burner 1, a connecting pipe 2, a waste heat recovery device 3 and a return pipe 4. The top of the RDF burner 1 is fixedly connected to the connecting pipe 2, and the other end of the connecting pipe 2 is connected and fixedly connected to the waste heat recovery device 3. The output end of the waste heat recovery device 3 is fixedly connected to an exhaust pipe 5. The waste heat recovery device 3 is connected and fixedly connected to the air inlet end of the RDF burner 1 via the return pipe 4. A PLC controller 6 for operating the equipment is installed on the RDF burner 1.

[0023] The waste heat recovery device 3 includes a high-temperature recovery chamber 31, a connecting pipe 32, a low-temperature recovery chamber 33, and a fan 34. The air inlet of the high-temperature recovery chamber 31 is connected and fixed to the connecting pipe 2. The exhaust end of the high-temperature recovery chamber 31 is fixedly connected to the connecting pipe 32. The other end of the connecting pipe 32 is connected and fixed to the air inlet of the low-temperature recovery chamber 33. The exhaust end of the low-temperature recovery chamber 33 is connected and fixed to the exhaust pipe 5. The air exhaust end of the low-temperature recovery chamber 33 is connected and fixed to the return pipe 4. The fan 34 is fixedly installed on the top of the low-temperature recovery chamber 33 and guides air inward. The low-temperature air introduced by the fan 34 is guided downward into the return pipe 4 after heat exchange.

[0024] In this invention, RDF fuel is added to the RDF burner 1, and then the PLC controller 6 operates the RDF burner 1 for combustion. The high-temperature exhaust gas generated by combustion is discharged into the waste heat recovery device 3 through the connecting pipe 2. The exhaust gas passes through the high-temperature recovery chamber 31, the connecting pipe 32, and the low-temperature recovery chamber 33 in sequence, and is finally discharged through the exhaust pipe 5. The high-temperature recovery chamber 31 is filled with water to absorb the heat of the exhaust gas, realizing the recovery of most of the heat capacity of the high-temperature exhaust gas and realizing the heating of the water flow for heat supply. When the cooled exhaust gas enters the low-temperature recovery chamber 33, the fan 34 is started to introduce air into the heat exchange mechanism inside the low-temperature recovery chamber 33 to realize the heat exchange between the hot and cold air, and perform secondary heat exchange. Heat recovery is achieved by simultaneously preheating the air through the return pipe 4 into the interior of the RDF burner 1 for auxiliary combustion. This preheats the intake air and improves combustion efficiency. The device thus achieves the advantages of efficient secondary heat recovery of combustion exhaust gas, and preheating the air required for combustion using the waste heat of the exhaust gas, thereby improving combustion efficiency and waste heat recovery rate. This solves the problem that in existing RDF combustion equipment, while generating energy through combustion, the exhaust gas temperature remains high, and direct emission of this gas results in a direct waste of internal energy. Current exhaust gas waste heat recovery equipment typically only recovers heat once, leaving a significant amount of residual heat in the final exhaust gas, thus requiring further improvement in recovery efficiency.

[0025] Please see Figure 2 and Figure 4 The high-temperature recovery chamber 31 is internally fixedly connected with horizontally arranged and sequentially connected heat exchange spiral coils 311. The water inlet and drain of the heat exchange spiral coils 311 are respectively connected to the high-temperature recovery chamber 31 and connected to external water pipes.

[0026] In this invention, the inlet and outlet ends of the heat exchange spiral coil 311 are connected to an external water pipe to achieve continuous internal injection and recovery of most of the heat from the initial high-temperature exhaust gas. At the same time, the heat exchange spiral coil 311 is arranged vertically along the exhaust gas flow direction to increase the contact time between the exhaust gas and the heat exchange spiral coil 311 and improve the heat exchange efficiency.

[0027] Please see Figure 2 and Figure 3 The low-temperature recovery chamber 33 is fixedly connected to a heat exchange block 331. The heat exchange block 331 is provided with multiple vent holes 332. The vent holes 332 are isolated from the exhaust gas path of the low-temperature recovery chamber 33. The vent holes 332 are used to guide the low-temperature air introduced by the fan 34 to the return pipe 4 at the bottom.

[0028] In this invention, the heat exchange block 331 transfers heat between the exhaust gas entering the low-temperature recovery chamber 33 and the ambient air inside the ventilation hole 332 of the independent channel, preheating the air and recovering the residual energy of the exhaust gas. At the same time, the preheated air enters the RDF burner 1 through the return pipe 4, thereby increasing the intake temperature and combustion efficiency.

[0029] Please see Figure 2 and Figure 3 The heat exchange block 331 includes multiple heat-conducting modules 3311 and multiple sets of heat-conducting fins 3312. The heat-conducting modules 3311 and heat-conducting fins 3312 are arranged longitudinally at intervals and fixed inside the low-temperature recovery chamber 33. The vent 332 is located inside the heat-conducting modules 3311.

[0030] In this invention, the heat-conducting module 3311 and the heat-conducting fins 3312 are arranged longitudinally at intervals, serving as the heat exchange medium between the air inside the vent 332 and the exhaust gas passing through the low-temperature recovery chamber 33. This allows the two to flow independently while simultaneously achieving heat exchange and recovery, thereby realizing the secondary recovery of exhaust gas energy.

[0031] Please see Figure 3 Among them, the surface of the heat-conducting fin 3312 is provided with grooves 3313 arranged at equal intervals.

[0032] In this invention, the contact area between the heat-conducting fins 3312 and the exhaust gas is increased by the groove 3313, thereby improving the heat exchange efficiency.

[0033] Please see Figure 2 and Figure 4 Among them, the high-temperature recovery chamber 31 is equipped with a positioning support frame 7 for supporting the heat exchange spiral coil 311.

[0034] In this invention, the installation stability of the heat exchange spiral coil 311 is improved and the structural strength is enhanced by the positioning support frame 7.

[0035] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. An RDF combustion exhaust gas treatment device with waste heat recovery function, characterized in that: The device includes an RDF burner (1), a connecting pipe (2), a waste heat recovery device (3), and a return pipe (4). The top of the RDF burner (1) is fixedly connected to the connecting pipe (2), and the other end of the connecting pipe (2) is connected to the waste heat recovery device (3). The output end of the waste heat recovery device (3) is fixedly connected to an exhaust pipe (5). The waste heat recovery device (3) is connected to the air inlet end of the RDF burner (1) via the return pipe (4). A PLC controller (6) for operating the equipment is installed on the RDF burner (1). The waste heat recovery device (3) includes a high temperature recovery chamber (31), a connecting pipe (32), a low temperature recovery chamber (33), and a fan (34). The air inlet of the high temperature recovery chamber (31) is connected and fixed to the connecting pipe (2). The exhaust end of the high temperature recovery chamber (31) is fixedly connected to the connecting pipe (32). The other end of the connecting pipe (32) is connected and fixed to the air inlet of the low temperature recovery chamber (33). The exhaust end of the low temperature recovery chamber (33) is connected and fixed to the exhaust pipe (5). The air exhaust end of the low temperature recovery chamber (33) is connected and fixed to the return pipe (4). The fan (34) is fixedly installed on the top of the low temperature recovery chamber (33) and guides the air inward. The low temperature air introduced by the fan (34) is introduced downward into the return pipe (4) after heat exchange.

2. The RDF combustion exhaust gas treatment device with waste heat recovery function according to claim 1, characterized in that: The high-temperature recovery chamber (31) is fixedly connected with horizontally arranged and sequentially connected heat exchange spiral coils (311). The water inlet and drain of the heat exchange spiral coils (311) are respectively connected to the high-temperature recovery chamber (311) and connected to external water pipes.

3. The RDF combustion exhaust gas treatment device with waste heat recovery function according to claim 1, characterized in that: The low-temperature recovery chamber (33) is fixedly connected to a heat exchange block (331). The heat exchange block (331) is provided with multiple vent holes (332). The vent holes (332) are isolated from the exhaust gas path of the low-temperature recovery chamber (33). The vent holes (332) are used to guide the low-temperature air introduced by the fan (34) to the return pipe (4) at the bottom.

4. The RDF combustion exhaust gas treatment device with waste heat recovery function according to claim 3, characterized in that: The heat exchange block (331) includes multiple heat-conducting modules (3311) and multiple sets of heat-conducting fins (3312). The heat-conducting modules (3311) and heat-conducting fins (3312) are arranged longitudinally at intervals and fixed inside the low-temperature recovery chamber (33). The vent (332) is located inside the heat-conducting module (3311).

5. The RDF combustion exhaust gas treatment device with waste heat recovery function according to claim 4, characterized in that: The surface of the heat-conducting fins (3312) is provided with grooves (3313) arranged at equal intervals.

6. The RDF combustion exhaust gas treatment device with waste heat recovery function according to claim 2, characterized in that: The high-temperature recovery chamber (31) is equipped with a positioning support frame (7) for supporting the heat exchange spiral coil (311).

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