Intelligent area heating system and heating method based on waste heat recovery

Abstract

The invention relates to the technical field of waste heat recovery, and discloses an intelligent regional heating system based on waste heat recovery, which comprises a main box, one side of the main box is provided with an opening, the opening is fixedly connected with a cover plate, and a cooling water heat recovery mechanism is formed by overlapping a plurality of heat exchange assemblies of C-shaped structures. The interiors of the multiple heat exchange assemblies are communicated to form an airflow channel to exchange heat with cooling water, the inner box is fixed in the main box, the cooling water recycling mechanism is connected in a gap between the inner box and the main box in a sleeved mode to form a cooling water channel, and the two opposite sides of the main box are fixedly connected with a high-temperature water pipe and a low-temperature water pipe correspondingly. One end of the rectangular pipe is fixed in the inner box and forms a heat storage chamber with the inner wall of the inner box. According to the intelligent regional heating system and method based on waste heat recovery, centralized recovery of gas-phase and liquid-phase waste heat sources can be achieved, waste of heat energy is reduced, and heating can be conducted on living quarters and production quarters respectively.

Description

Technical Field

[0001] The present invention relates to the field of waste heat recovery technology, and specifically to an intelligent district heating system and heating method based on waste heat recovery. Background Art

[0002] Waste heat is the unrecyclable heat generated by furnaces used in various industrial fields, such as distillation towers, incinerators, blast furnaces, and melting furnaces. This waste heat is discharged into the atmosphere as combustion exhaust from various kilns, boilers, drying equipment, and air conditioning equipment. During heating, distillation, evaporation, refining, and separation processes, it is cooled or condensed and discharged as cooling water. Relatively high-temperature waste heat is used for low-pressure steam production or boiler feed water preheating. In contrast, relatively low-temperature waste heat, due to technical limitations, cannot be recovered and is directly discarded. Furthermore, cooling of industrial equipment in production plants is crucial during operation. Circulating cooling water is typically used to control the temperature of the equipment. As the high-temperature cooling water flows through the radiator, fans blow on the radiator's surface, removing heat for forced cooling. The dissipated heat is then discharged directly into the air and discarded. High-temperature steam is also widely used in industrial production, such as for sterilization, drying, and chemical synthesis. This steam often contains a high level of heat after processing, and direct centralized discharge would result in significant waste.

[0003] At present, in industrial production, the efficiency of heat recovery and utilization is relatively low, and a large amount of heat is discharged separately, resulting in a large amount of heat loss. In addition, traditional waste heat recovery is too scattered and cannot be centralized for regional heating. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides an intelligent regional heating system and heating method based on waste heat recovery, which solves the problems of low efficiency in heat energy recovery and utilization, a large amount of heat is discharged separately, resulting in a large amount of heat loss, and traditional waste heat recovery is too dispersed to achieve centralized recovery for regional heating.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an intelligent district heating system based on waste heat recovery, comprising:

[0008] A main box, wherein one side of the main box is provided with an opening, and a cover plate is fixedly connected to the opening;

[0009] A cooling water heat recovery mechanism, wherein the cooling water heat recovery mechanism is formed by stacking a plurality of C-shaped heat exchange components, wherein the plurality of heat exchange components are internally connected to form an air flow channel for heat exchange with the cooling water;

[0010] An inner box, the inner box is fixed in the main box, the cooling water recovery mechanism is sleeved in the gap between the inner box and the main box to form a cooling water channel, and a high-temperature water pipe and a low-temperature water pipe are fixedly connected to opposite sides of the main box respectively;

[0011] A rectangular tube, one end of which is fixed in the inner box and forms a heat storage chamber with the inner wall of the inner box. The heat storage chamber is provided with an exhaust gas heat recovery mechanism for recovering heat in industrial exhaust gas and industrial steam. An exhaust pipe and an exhaust pipe are fixedly connected to one side of the main box;

[0012] A sealing end cover of a frame structure is fixedly connected between the inner box and the rectangular tube. A sealing ring is fixedly connected to the edge of one end of the inner box. The sealing ring and one end of the rectangular tube are in close contact with one side of the cover plate.

[0013] Preferably, the cooling water heat recovery mechanism includes a reversing pipe, an air inlet pipe and an air outlet pipe, the reversing pipe is a rectangular structure, and a plurality of the heat exchange components are stacked in sequence between the reversing pipe and the air inlet pipe and the air outlet pipe to form a cylindrical structure, and the four corners on the inner side of the reversing pipe are fixedly connected with long rod bolts, and the pipe walls of the air inlet pipe and the air outlet pipe are fixedly connected with two fixing cylinders, the air inlet pipe is connected with the two long rod bolts on the upper side through the two fixing cylinders, and the air outlet pipe is connected with the two long rod bolts on the lower side through the two fixing cylinders, one end of the long rod bolt passes through the fixing cylinder and is threadedly connected with a fixing nut, and two spacer blocks are fixedly connected to one side of the cover plate, and the two spacer blocks are respectively in contact with the pipe walls of the air inlet pipe and the air outlet pipe.

[0014] Preferably, the heat exchange assembly includes a first cover body and a second cover body, a tenon is provided at one end edge of the first cover body, a groove matching the tenon is provided at one end edge of the second cover body, a sealing gasket is fixedly connected in the groove, a first conduit is fixedly connected to one side of the first cover body, a constriction portion is provided at one end of the pipe opening of the first conduit, a communicating hole is provided on one side of the second cover body, the communicating hole matches the structure of the constriction portion, and a plurality of limiting pads are fixedly connected to one side of the first cover body;

[0015] Two guide holes are provided on the wall of the reversing pipe, and a second conduit with the same structure as the first conduit is fixedly connected to the wall of the air inlet pipe and the air outlet pipe, and a support pad with the same thickness as the limiting pad is fixedly connected to the wall of the air inlet pipe and the air outlet pipe.

[0016] Preferably, both ends of the air inlet pipe and the air outlet pipe are sealed structures, and a bent pipe is fixedly connected to one end of them, and a flange is fixedly connected to one end of the bent pipe. The flange is fixed to the inner wall of the main box by bolts, and the side wall of the main box is fixedly connected with a cold air pipe and a warm air pipe, and the cold air pipe corresponds to the flange position on the air inlet pipe, and the warm air pipe corresponds to the flange position on the air outlet pipe.

[0017] Preferably, two opposite sides of the inner box are provided with inner recesses, and a plurality of T-shaped water baffles are fixedly connected to the two inner recesses, and one end of the water baffle is flush with the side wall of the inner box.

[0018] Preferably, the exhaust gas heat recovery mechanism includes a heat exchange box, a partition is fixedly connected to the heat exchange box, a plurality of heat exchange tubes are fixedly connected to the heat exchange box, the plurality of heat exchange tubes are located in a heat storage chamber, and the heat storage chamber is used to fill a heat storage medium. One end of the exhaust pipe and the exhaust pipe extends into the main box and is fixedly connected to one side of the heat exchange box. The upper end of the main box is fixedly connected to an outer shell and a shell, a mixing component for mixing exhaust gas and steam is installed in the shell, and a multi-layer mesh plate is installed in the outer shell.

[0019] Preferably, the mixing assembly includes two bent plates, two rectangular plates are fixedly connected between the two bent plates, and flow channels are provided on the two bent portions of the two rectangular plates and the bent plates. An opening is provided at the upper end of the shell, and a circular plate is fixedly connected to the opening. The two bent plates are fixed to the lower end of the cover plate, and a connecting pipe is fixedly connected to the center of the circular plate. One end of the connecting pipe extends into the shell, and the other end of the connecting pipe is fixedly connected to a sealing plate. The sealing plate is fixed to the upper end of the shell, and the side wall of the circular plate is fixedly connected to two air inlet pipes, and a plurality of exhaust ports are obliquely provided on the pipe wall of the two air inlet pipes.

[0020] Preferably, a plurality of limiting protrusions are fixedly connected in the shell, and the plurality of mesh plates are respectively fixed on the upper ends of the plurality of limiting protrusions. One end of the exhaust pipe is fixedly connected to one side of the shell at its outlet and is located below the lowest mesh plate.

[0021] Preferably, a rectangular opening is provided on one side of the cover plate, a door panel is hinged to the rectangular opening through a hinge, a protruding mounting portion is provided on the side wall of the door panel, a fan is fixedly connected to the mounting portion, and a storage rack is fixedly connected to the rectangular tube.

[0022] The heating method provided by the present invention comprises the following steps:

[0023] Step 1: Collect gas phase waste heat, collect the gas phase waste heat and collect it through pipelines to the exhaust main pipe, and then send it to the exhaust gas heat recovery mechanism through the exhaust pipe;

[0024] Step 2: Collect liquid phase waste heat, send the liquid phase high-temperature cooling water into the main box through the high-temperature water pipe, and connect the low-temperature water pipe to the cooling water return pipe, and use the cooling water heat recovery mechanism to recover the waste heat in the cooling water;

[0025] Step 3: Heat storage: using the heat storage medium filled in the heat storage chamber to absorb the heat recovered in steps 1 and 2 to ensure the heating duration and temperature balance;

[0026] Step 4: Low-temperature heating output: Use the warm air pipe to exhaust the air in the heat exchange component and send the warm air to the heat-using unit through the branch pipe;

[0027] Step 5: High-temperature heating output: using the exhaust gas heat recovery mechanism to build a high-temperature heating area in the main box for drying operations during the production process;

[0028] Step six, exhaust gas treatment: the exhaust gas from the exhaust gas heat recovery device is discharged to the exhaust gas treatment system through the exhaust pipe and discharged after targeted treatment.

[0029] (3) Beneficial effects

[0030] Compared with the prior art, the present invention provides an intelligent district heating system and heating method based on waste heat recovery, which has the following beneficial effects:

[0031] 1. The closed flow path formed inside the heat exchange component can directly exchange heat with the medium that can recover heat. The internal flow path of the cooling water heat recovery mechanism has a large flow volume and extends the air flow path in a limited space, greatly increasing the efficiency of heat recovery.

[0032] 2. After being mixed by the mixing assembly, the high-temperature exhaust gas and steam enter the air intake area of ​​the heat exchange box. The air intake area distributes the air to multiple heat exchange tubes. At this time, the heat exchange tubes can exchange heat with the heat storage medium in the storage chamber, and use the heat storage medium to absorb and store the heat of the exhaust gas and steam to achieve heat recovery of the exhaust gas. In addition, the upper part of the heat exchange box extends directly into the rectangular tube. At this time, part of the heat is directly diffused in the rectangular tube to form a high-temperature area. At this time, the drying process in the production process can be carried out directly inside the rectangular tube, and the air inside can be circulated by a fan to increase the drying speed.

[0033] 3. This technical solution introduces exhaust gas and steam respectively through two air inlet pipes. The exhaust gas and steam pass through the flow channel on the bent plate and enter the rectangular space between the bent plate and the rectangular plate from the flow channel on the rectangular plate. At this time, the exhaust gas and steam form a mixed gas and enter the outer shell from the connecting pipe. At this time, the mixed gas passes through multiple mesh plates from top to bottom for further mixing. After mixing, the moisture in the steam will absorb the particulate matter in the exhaust gas, making it easier for the particulate matter to adhere to the mesh plate in the outer shell. In this way, the concentration of particulate matter in the exhaust gas can be reduced, reducing the difficulty of subsequent exhaust gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of the intelligent district heating system based on waste heat recovery proposed by the present invention Figure 1 ;

[0035] Figure 2 Schematic diagram of the structure of the intelligent district heating system based on waste heat recovery proposed by the present invention Figure 2 ;

[0036] Figure 3 Cross-sectional view of the intelligent district heating system based on waste heat recovery proposed by the present invention Figure 1 ;

[0037] Figure 4 Cross-sectional view of the intelligent district heating system based on waste heat recovery proposed by the present invention Figure 2 ;

[0038] Figure 5 This is a schematic structural diagram of a cooling water heat recovery mechanism in an intelligent district heating system based on waste heat recovery proposed by the present invention;

[0039] Figure 6 A cross-sectional view of a cooling water heat recovery mechanism in an intelligent district heating system based on waste heat recovery proposed by the present invention;

[0040] Figure 7 This is an exploded diagram of the heat exchange components in the intelligent district heating system based on waste heat recovery proposed by the present invention;

[0041] Figure 8 This is a schematic structural diagram of the heat exchange component in the intelligent district heating system based on waste heat recovery proposed by the present invention;

[0042] Figure 9 This is a schematic structural diagram of the cooling water heat recovery mechanism, inner box and rectangular tube of the intelligent district heating system based on waste heat recovery proposed by the present invention;

[0043] Figure 10 A cross-sectional view of the inner box, rectangular tubes, and heat exchange tubes in the intelligent district heating system based on waste heat recovery proposed by the present invention;

[0044] Figure 11 This is a schematic structural diagram of the waste heat recovery mechanism in the intelligent district heating system based on waste heat recovery proposed by the present invention;

[0045] Figure 12 This is a schematic diagram of the internal structure of the outer shell and the shell in the intelligent district heating system based on waste heat recovery proposed by the present invention;

[0046] Figure 13 This is a block diagram of the intelligent district heating system based on waste heat recovery proposed in the present invention.

[0047] In the figure: 1. Main box; 2. Cover plate; 3. Door panel; 4. Fan; 5. Shell; 6. Outer shell; 7. Connecting pipe; 8. High-temperature water pipe; 9. Cold air pipe; 10. Warm air pipe; 11. Exhaust pipe; 12. Exhaust pipe; 13. Low-temperature water pipe; 14. Heat exchange component; 15. Inlet pipe; 16. Elbow pipe; 17. Inner box; 18. Rectangular pipe; 19. Storage rack; 20. Sealing end cap; 21. Spacer block; 22. Sealing ring; 23. Outlet Air pipe; 24. Inner recess; 25. Reversing pipe; 26. Long rod bolt; 27. Guide hole; 28. Second conduit; 29. ​​First conduit; 30. First cover; 31. Sealing gasket; 32. Connecting hole; 33. Second cover; 34. Limiting pad; 35. Heat storage chamber; 36. Water baffle; 37. Heat exchange pipe; 38. Heat exchange box; 39. Partition; 40. Bending plate; 41. Air inlet pipe; 42. Rectangular plate; 43. Mesh plate. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] Example 1:

[0050] Refer to the attached Figure 1-11 The intelligent district heating system based on waste heat recovery includes a main box 1, one side of which is provided with an opening, and a cover plate 2 is fixedly connected to the opening. A cooling water heat recovery mechanism is provided in the main box 1. The cooling water heat recovery mechanism is composed of a plurality of C-shaped heat exchange components 14 stacked together. The plurality of heat exchange components 14 are internally connected to form an air flow channel for heat exchange with the cooling water.

[0051] An inner box 17 is sealed and connected in the main box 1. The inner box 17 is fixed in the main box 1. The cooling water recovery mechanism is sleeved in the gap between the inner box 17 and the main box 1 to form a cooling water channel. The high-temperature water pipe 8 and the low-temperature water pipe 13 are fixedly connected to the opposite sides of the main box 1 respectively. The opposite sides of the inner box 17 are provided with inner recesses 24. The inner recesses 24 are mainly used to allow the cooling water to pass smoothly through the gap of the superimposed heat exchange components 14. A plurality of T-shaped water baffles 36 are fixedly connected to the two inner recesses 24. One end of the water baffle 36 is flush with the side wall of the inner box 17. When the cooling water heat recovery mechanism is sleeved on the inner box 17, the water baffle 36 can be fitted together with the outer side of the inner box 17 on the inner side of the heat exchange component 14, so that the cooling water can flow along a curved path, such as Figure 4 As shown, the water baffles 36 provided in the inner recesses 24 on both sides are cross-arranged. When the cooling water enters from the high-temperature water pipe 8, the heat exchange component can be used to change the flow direction of the hot cooling water, thereby extending the flow path and time of the cooling water in the cooling water heat recovery mechanism, so that the heat in the cooling water can be fully recovered.

[0052] like Figure 5-8 As shown, the cooling water heat recovery mechanism includes a reversing pipe 25, an air inlet pipe 15 and an air outlet pipe 23. The reversing pipe 25 is a rectangular structure. Multiple heat exchange components 14 are sequentially stacked between the reversing pipe 25 and the air inlet pipe 15 and the air outlet pipe 23 to form a cylindrical structure. Long rod bolts 26 are fixedly connected to the four corners of the inner side of the reversing pipe 25. Two fixed cylinders are fixedly connected to the pipe walls of the air inlet pipe 15 and the air outlet pipe 23. The air inlet pipe 15 is sleeved with the two long rod bolts 26 located on the upper side through the two fixed cylinders. The outlet pipe 23 is connected to the two long rod bolts 26 located on the lower side through two fixing cylinders. One end of the long rod bolt 26 passes through the fixing cylinder and is threadedly connected to a fixing nut. At this time, multiple heat exchange components 14 are fixed between the reversing pipe 25, the air inlet pipe 15 and the air outlet pipe 23 by four long rod bolts 26, and a curved air flow path is formed inside them. Two baffle blocks 21 are fixedly connected to one side of the cover plate 2. The two baffle blocks 21 are in contact with the pipe walls of the air inlet pipe 15 and the air outlet pipe 23 respectively. Figure 3 As shown, the two blocks 21 play a role in limiting the water flow and can separate the high and low temperature cooling water;

[0053] In this embodiment, the heat exchange component 14 adopts a split splicing assembly structure. The heat exchange component 14 includes a first cover body 30 and a second cover body 33. A tenon is provided at one end edge of the first cover body 30, and a groove matching the tenon is provided at one end edge of the second shell 5. A sealing gasket 31 is fixedly connected in the groove. Under the action of the long rod bolt 26, the first cover bodies 30 and the second cover bodies 33 of the multiple heat exchange components 14 can be synchronously pressed and fixed to ensure sealing. At the same time, a first conduit 29 is fixedly connected to one side of the first cover body 30, and a bundle mouth portion is provided at one end of the pipe mouth of the first conduit 29. A connecting hole 32 is provided on one side of the second cover body 33, and the connecting hole 32 matches the structure of the bundle mouth portion, such as Figure 6 As shown, the first conduit 29 cooperates with the connecting hole 32 to achieve the effect of connecting multiple heat exchange components 14 in series, so that air can flow along a curved path in the heat exchange component 14. A plurality of limiting pads 34 are fixedly connected to one side of the first cover 30. The reversing tube 25 is a frame-shaped and internally connected tube. Two guide holes 27 are provided on the tube wall of the reversing tube 25. The two guide holes 27 correspond to the first conduits 29 on the heat exchange components 14 on both sides. The tube walls of the air inlet pipe 15 and the air outlet pipe 23 are fixedly connected with the first conduit 29. The same second duct 28, the pipe walls of the air inlet pipe 15 and the air outlet pipe 23 are fixedly connected with support pads of the same thickness as the limiting pads 34, both ends of the air inlet pipe 15 and the air outlet pipe 23 are sealed structures, and one end is fixedly connected to a bend pipe 16, one end of the bend pipe 16 is fixedly connected to a flange, the flange is fixed to the inner wall of the main box 1 by bolts, the side wall of the main box 1 is fixedly connected with a cold air pipe 9 and a warm air pipe 10, the cold air pipe 9 corresponds to the flange position on the air inlet pipe 15, and the warm air pipe 10 corresponds to the flange position on the air outlet pipe 23.

[0054] When the cooling water heat recovery mechanism is installed in the main box 1, the cold air pipe 9 and the warm air pipe 10 can be connected to the corresponding air inlet pipe 15 and the air outlet pipe 23 through the flange, so that fresh air can enter the heat exchange component 14 of the cooling water heat recovery mechanism from the cold air pipe 9 and the air inlet pipe 15, and then be discharged from the air outlet pipe 23 and the warm air pipe 10 after circulation. The exhausted hot air can be directly supplied to the heating unit, and an air filter (not shown in the figure) can be installed at the cold air pipe 9 to ensure the quality of the fresh air supply.

[0055] There are more replacement schemes in this embodiment, such as using rectangular pipes to directly make an integral heat exchange component 14, but the integral heat exchange component 14 is not conducive to subsequent repair and maintenance. When there are debris attached to it, it cannot be cleaned. The present technical solution adopts a split splicing solution, which can be quickly disassembled and cleaned during subsequent maintenance. In addition, the cooling water flow area of ​​the present technical solution can also be interchanged with the flow path of the heat exchange air. In order to ensure the heat exchange efficiency, the cooling water heat recovery mechanism can adopt aluminum or copper with high thermal conductivity. At the same time, the main box 1 and the cover plate 2 both adopt a double-layer structure, and the gap is filled with thermal insulation materials, such as foamed polyurethane or thermal insulation cotton.

[0056] The cooling water heat recovery mechanism designed through the present technical solution utilizes the closed flow path formed inside the heat exchange component 14 to directly exchange heat with the medium that can recover heat. In addition, the internal flow path of the cooling water heat recovery mechanism has a large flow volume and extends the air flow path within a limited space, greatly increasing the efficiency of heat recovery.

[0057] Example 2: Based on Example 1, the only difference is that:

[0058] Refer to the attached Figure 2-3 and attached Figure 9-11 , this technical solution mainly adds a rectangular tube 18, one end of the rectangular tube 18 is fixed in the inner box 17 and forms a heat storage chamber 35 between the inner wall of the inner box 17, the heat storage chamber 35 is used to fill the heat storage medium, mainly latent heat storage materials, such as paraffin, crystalline hydrated salts, etc., the heat storage chamber 35 is provided with a waste gas heat recovery mechanism for recovering heat in industrial tail gas and industrial steam, one side of the main box 1 is fixedly connected to the exhaust pipe 12 and the exhaust pipe 11, a frame-shaped sealing end cover 20 is fixedly connected between the inner box 17 and the rectangular tube 18, a sealing ring 22 is fixedly connected to the edge of one end of the inner box 17, the sealing ring 22 and one end of the rectangular tube 18 are in close contact with one side of the cover plate 2, the waste gas heat recovery mechanism includes a heat exchange box 38, a partition 39 is fixedly connected to the heat exchange box 38, and the partition 39 can divide the inside of the heat exchange box 38 into In the air intake area and the exhaust area, a plurality of heat exchange tubes 37 are fixedly connected to the heat exchange box 38, and the two ends of the heat exchange tubes 37 are respectively fixedly connected to the opposite sides of the heat exchange box 38. In this way, the exhaust gas or steam in the intake area can pass through the heat exchange tubes 37 and enter the exhaust area and finally be discharged. The plurality of heat exchange tubes 37 are all located in the heat storage chamber 35, and one end of the exhaust pipe 11 and the exhaust pipe 12 extend into the main box 1 and are fixedly connected to one side of the heat exchange box 38. The upper end of the main box 1 is fixedly connected to the outer shell 6 and the shell 5, and a mixing assembly for mixing exhaust gas and steam is installed in the shell 5. A multi-layer mesh plate 43 is installed in the outer shell 6. A rectangular opening is opened on one side of the cover plate 2, and a door panel 3 is hinged at the rectangular opening by a hinge. The side wall of the door panel 3 is provided with a protruding mounting portion, and a fan 4 is fixedly connected in the mounting portion. A storage rack 19 is fixedly connected in the rectangular tube 18;

[0059] In this embodiment, the high-temperature exhaust gas and steam are mixed by the mixing assembly and then enter the air intake area in the heat exchange box 38. The air intake area distributes the air to multiple heat exchange tubes 37. At this time, the heat exchange tubes 37 can exchange heat with the heat storage medium in the storage chamber, and use the heat storage medium to absorb and store the heat of the exhaust gas and steam to achieve heat recovery of the exhaust gas. In addition, the upper part of the heat exchange box 38 directly extends into the rectangular tube 18. At this time, part of the heat is directly diffused in the rectangular tube 18 to form a high-temperature area. At this time, the drying process in the production process can be carried out directly inside the rectangular tube 18, and the air inside it can be made to flow by the fan 4 to increase the drying speed.

[0060] Example 3: Based on Example 2, the only difference is that:

[0061] Reference Figure 12 The main purpose of mixing industrial exhaust gas with steam is to balance the temperature of the exhaust gas, and secondly, to use the moisture in the steam to absorb particulate matter in the exhaust gas. The specific technical solution is as follows;

[0062] The mixing assembly includes two bent plates 40, and two rectangular plates 42 are fixedly connected between the two bent plates 40. Flow channels are provided on the two rectangular plates 42 and the two bent parts of the bent plates 40. The position of the flow channel on the rectangular plate 42 is higher than the position of the flow channel on the bent plate 40 in the space. An opening is provided at the upper end of the shell 5, and a circular plate is fixedly connected to the opening. The two bent plates 40 are fixed to the lower end of the cover plate 2. A connecting pipe 7 is fixedly connected to the center of the circular plate. One end of the connecting pipe 7 extends into the shell 5, and the other end of the connecting pipe 7 is fixedly connected to a sealing plate. The sealing plate is fixed to the upper end of the shell 6. Two air inlet pipes 41 are fixedly connected to the side wall of the circular plate. Multiple exhaust ports are obliquely opened on the pipe wall of the two air inlet pipes 41. Multiple limiting protrusions are fixedly connected to the shell 6, and multiple mesh plates 43 are respectively fixed to the upper ends of the multiple limiting protrusions. One end of the exhaust pipe 11 is fixedly connected to one side of the shell 5 and is located below the lowest mesh plate 43.

[0063] The present technical solution introduces exhaust gas and steam respectively through two air inlet pipes 41. The exhaust gas and steam pass through the flow channel on the bent plate 40 and enter the rectangular space between the bent plate 40 and the rectangular plate 42 from the flow channel on the rectangular plate 42. At this time, the exhaust gas and steam form a mixed gas and enter the outer shell 6 from the connecting pipe 7. At this time, the mixed gas passes through multiple mesh plates 43 from top to bottom for further mixing. After mixing, the moisture in the steam will absorb the particulate matter in the exhaust gas, making it easier for the particulate matter to adhere to the mesh plate 43 in the outer shell 6. In this way, the concentration of particulate matter in the exhaust gas can be reduced, reducing the difficulty of subsequent exhaust gas treatment.

[0064] Example 4;

[0065] like Figure 13 As shown, the heating system provided by the present invention has the following process when in use:

[0066] 1. Gas-phase waste heat mainly consists of tail gas and steam in industrial production. These gases often contain a large amount of heat. The gas-phase waste heat is collected and concentrated into the exhaust gas main pipe through a pipeline. Insulation measures are taken for the pipeline to reduce losses during collection and transportation. The waste heat is then sent to the exhaust gas heat recovery mechanism through the exhaust pipe 11. Compared with the traditional method of directly using a separate heat exchange device near the heat source for heat exchange, this technical solution first concentrates the gas-phase heat source and then performs heat exchange in a unified manner. This can improve the heat exchange efficiency and avoid the problem of heat recovery by dispersed heat exchange, which cannot be centrally allocated for secondary use.

[0067] Second, collect liquid waste heat. This type of liquid is mainly cooling water used in industrial production. This type of cooling water is often used to dissipate heat and cool down mechanical equipment, or is a liquid used to cool down production products. Usually, the heat of this type of liquid is discharged nearby, so that the temperature of the cooling water is reduced and then recirculated into the mechanical equipment to continue circulating and dissipating heat for the machinery. Therefore, after this improvement, the high-temperature cooling water in the liquid phase is sent into the main box 1 through the high-temperature water pipe 8, and the low-temperature water pipe 13 is connected to the cooling water return pipe. The cooling water heat recovery mechanism is used to recover the waste heat in the cooling water. If the mechanical equipment has a temperature requirement for the cooling water, it can be independently adjusted by adjusting the speed of the discharge and return cooling water. This technology has been widely used in life and will not be described in detail here.

[0068] 3. Heat storage: The heat storage medium filled in the heat storage chamber absorbs the heat recovered in step 1 and step 2 to ensure the duration of heating and the balance of temperature. Since the recovered heat is directly sent to the heat-using area, there may be temperature fluctuations. Therefore, this technical solution is to use the technical ideas of recycling waste heat, storing heat and continuously supplying heat. Heat storage is used as a unit for regulating temperature. When the heat in the cooling water and gas-phase waste heat is high, the excess heat is stored in the heat storage medium. When the heat in the cooling water and gas-phase waste heat is low, the stored heat can be released back to the heat exchange medium. At this time, not only can the balance of heat output be ensured, but also the heat output time can be extended.

[0069] Fourth, low-temperature heating is output to the living area. The warm air pipe 10 is used to exhaust the air in the heat exchange component 14 through a pipe, and the warm air is sent to the heat-using unit through a branch pipe. An independent exhaust fan, air control valve and other related equipment are installed at the heat-using unit;

[0070] 5. Set up an independent high-temperature heating output in the system, and use the exhaust gas heat recovery mechanism to build a high-temperature heating area in the main box 1. The temperature of the high-temperature heating area is close to that of the exhaust gas and steam, and is used for drying operations during the production process;

[0071] 6. The exhaust gas from the exhaust gas heat recovery device is discharged to the exhaust gas treatment system through the exhaust pipe 12 and discharged after targeted treatment.

[0072] Since this system recovers waste heat from industrial production, it is necessary to install temperature control equipment on the cooling water circulation pipeline when the cooling water participates in the heat exchange. The temperature control equipment includes water temperature sensors, controllers, electric control valves and other components. It mainly detects the water temperature of the cooling water. When the water temperature is lower than the set value, the cooling water is controlled by the electric control valve on the pipeline and does not participate in the heat exchange. This can prevent the continuous flow of cooling water from taking away the collected heat. In addition, an intelligent temperature control system can also be used in the heating part, that is, the same principle is adopted, and the temperature of the heating area is monitored by a temperature sensor. When the set temperature is reached, the exhaust volume is controlled by an electric air valve to control the temperature of the heating area automatically and intelligently. This technology has been widely used in life and is implemented using existing technical means. I will not go into details here.

[0073] It should be noted that the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Intelligent district heating system based on waste heat recovery, characterized by: include: A main box (1), wherein one side of the main box (1) is provided with an opening, and a cover plate (2) is fixedly connected to the opening; A cooling water heat recovery mechanism, wherein the cooling water heat recovery mechanism is formed by stacking a plurality of C-shaped heat exchange components (14), wherein the plurality of heat exchange components (14) are internally connected to form an air flow channel for heat exchange with the cooling water; An inner box (17), the inner box (17) is fixed in the main box (1), the cooling water recovery mechanism is sleeved in the gap between the inner box (17) and the main box (1) to form a cooling water channel, and the opposite sides of the main box (1) are respectively fixedly connected with a high-temperature water pipe (8) and a low-temperature water pipe (13); A rectangular tube (18), one end of which is fixed in the inner box (17) and forms a heat storage chamber (35) with the inner wall of the inner box (17), wherein the heat storage chamber (35) is provided with an exhaust gas heat recovery mechanism for recovering heat in industrial exhaust gas and industrial steam, and one side of the main box (1) is fixedly connected to an exhaust pipe (12) and an exhaust pipe (11); A sealing end cover (20) of a frame structure is fixedly connected between the inner box (17) and the rectangular tube (18), and a sealing ring (22) is fixedly connected to the edge of one end of the inner box (17). The sealing ring (22) and one end of the rectangular tube (18) are both in close contact with one side of the cover plate (2).

2. The intelligent district heating system based on waste heat recovery according to claim 1, characterized in that: The cooling water heat recovery mechanism includes a reversing pipe (25), an air inlet pipe (15) and an air outlet pipe (23). The reversing pipe (25) is a rectangular structure. A plurality of heat exchange components (14) are sequentially stacked between the reversing pipe (25) and the air inlet pipe (15) and the air outlet pipe (23) to form a cylindrical structure. The four corners of the inner side of the reversing pipe (25) are fixedly connected with long rod bolts (26). The walls of the air inlet pipe (15) and the air outlet pipe (23) are fixedly connected with two fixed bolts. The fixed cylinder is provided, wherein the air inlet pipe (15) is sleeved with two long rod bolts (26) located on the upper side through two fixed cylinders, and the air outlet pipe (23) is sleeved with two long rod bolts (26) located on the lower side through two fixed cylinders, one end of the long rod bolt (26) passes through the fixed cylinder and is threadedly connected to a fixing nut, and one side of the cover plate (2) is fixedly connected with two spacer blocks (21), and the two spacer blocks (21) are in contact with the pipe walls of the air inlet pipe (15) and the air outlet pipe (23) respectively.

3. The intelligent district heating system based on waste heat recovery according to claim 2, characterized in that: The heat exchange assembly (14) comprises a first cover body (30) and a second cover body (33), wherein a tenon is provided at one end edge of the first cover body (30), a groove matching the tenon is provided at one end edge of the second shell (5), a sealing gasket (31) is fixedly connected in the groove, a first conduit (29) is fixedly connected to one side of the first cover body (30), a constriction portion is provided at one end of the pipe opening of the first conduit (29), a connecting hole (32) is provided on one side of the second cover body (33), the connecting hole (32) matches the structure of the constriction portion, and a plurality of limiting pads (34) are fixedly connected to one side of the first cover body (30); Two guide holes (27) are provided on the wall of the reversing pipe (25); a second conduit (28) having the same structure as the first conduit (29) is fixedly connected to the walls of the air inlet pipe (15) and the air outlet pipe (23); and a support pad having the same thickness as the limiting pad (34) is fixedly connected to the walls of the air inlet pipe (15) and the air outlet pipe (23).

4. The intelligent district heating system based on waste heat recovery according to claim 2, characterized in that: Both ends of the air inlet pipe (15) and the air outlet pipe (23) are sealed structures, and one end thereof is fixedly connected to a bent pipe (16), one end of the bent pipe (16) is fixedly connected to a flange, and the flange is fixed to the inner wall of the main box (1) by bolts. The side wall of the main box (1) is fixedly connected to a cold air pipe (9) and a warm air pipe (10), and the cold air pipe (9) corresponds to the flange position on the air inlet pipe (15), and the warm air pipe (10) corresponds to the flange position on the air outlet pipe (23).

5. The intelligent district heating system based on waste heat recovery according to claim 1 is characterized in that: The inner box (17) is provided with inner recesses (24) on both opposite sides, and a plurality of T-shaped water baffles (36) are fixedly connected to the two inner recesses (24), and one end of the water baffle (36) is flush with the side wall of the inner box (17).

6. The intelligent district heating system based on waste heat recovery according to claim 1, characterized in that: The exhaust gas heat recovery mechanism includes a heat exchange box (38), a partition (39) is fixedly connected to the heat exchange box (38), a plurality of heat exchange tubes (37) are fixedly connected to the heat exchange box (38), the plurality of heat exchange tubes (37) are all located in a heat storage chamber (35), and the heat storage chamber (35) is used to be filled with a heat storage medium. One end of the exhaust pipe (11) and the exhaust pipe (12) extend into the main box (1) and are fixedly connected to one side of the heat exchange box (38). The upper end of the main box (1) is fixedly connected to an outer shell (6) and a shell (5), a mixing component for mixing exhaust gas and steam is installed in the shell (5), and a multi-layer mesh plate (43) is installed in the outer shell (6).

7. The intelligent district heating system based on waste heat recovery according to claim 6, characterized in that: The mixing assembly comprises two bent plates (40), two rectangular plates (42) are fixedly connected between the two bent plates (40), and flow channels are provided on the two bent portions of the two rectangular plates (42) and the bent plates (40). The upper end of the shell (5) is provided with an opening, and a circular plate is fixedly connected to the opening. The two bent plates (40) are fixed to the lower end of the cover plate (2), and a connecting pipe (7) is fixedly connected to the center of the circular plate. One end of the connecting pipe (7) extends into the shell (5), and the other end of the connecting pipe (7) is fixedly connected to a sealing plate, and the sealing plate is fixed to the upper end of the shell (6). The side wall of the circular plate is fixedly connected to two air inlet pipes (41), and a plurality of air outlets are inclinedly provided on the pipe wall of the two air inlet pipes (41).

8. The intelligent district heating system based on waste heat recovery according to claim 6, characterized in that: A plurality of limiting protrusions are fixedly connected inside the shell (6), and a plurality of mesh plates (43) are respectively fixed to the upper ends of the plurality of limiting protrusions. One end of the exhaust pipe (11) is fixedly connected to one side of the shell (5) at a pipe opening and is located below the lowest mesh plate (43).

9. The intelligent district heating system based on waste heat recovery according to claim 1, characterized in that: A rectangular opening is provided on one side of the cover plate (2), a door panel (3) is hingedly connected to the rectangular opening, a protruding mounting portion is provided on the side wall of the door panel (3), a fan (4) is fixedly connected to the mounting portion, and a storage rack (19) is fixedly connected to the rectangular tube (18).

10. A heating method for the intelligent district heating system based on waste heat recovery according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Collect gas phase waste heat, collect the gas phase waste heat and collect it into the exhaust main pipe through the pipeline, and send it to the exhaust heat recovery mechanism through the exhaust pipe (11); Step 2: Collect liquid phase waste heat, send the liquid phase high-temperature cooling water into the main box (1) through the high-temperature water pipe (8), and connect the low-temperature water pipe (13) to the cooling water return pipe, and use the cooling water heat recovery mechanism to recover the waste heat in the cooling water; Step 3: Heat storage: using the heat storage medium filled in the heat storage chamber to absorb the heat recovered in steps 1 and 2 to ensure the heating duration and temperature balance; Step 4: Low-temperature heating output: the air in the heat exchange component (14) is discharged through the warm air pipe (10) through a pipe, and the warm air is sent to the heat-using unit through a branch pipe; Step 5: High-temperature heating output: using the waste gas heat recovery mechanism to construct a high-temperature heating zone in the main box (1) for drying during the production process; Step 6: exhaust gas treatment. The exhaust gas from the exhaust gas heat recovery device is discharged to the exhaust gas treatment system through the exhaust pipe (12) and discharged after targeted treatment.

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