A gypsum board raw material calcination waste heat recovery device

Abstract

The utility model relates to a waste heat utilization technical field, concretely is a kind of gypsum board raw material calcination waste heat recovery device, including flue gas heat exchanger, lithium bromide refrigerating unit, cooling tower and air supply fan, lithium bromide refrigerating unit includes generator, condenser, absorber and evaporator;Flue gas heat exchanger is connected generator by first heat exchange circulation pipeline, generator is connected with condenser by first conveying pipeline, condenser is connected with evaporator by second conveying pipeline, evaporator is connected air supply fan by another refrigeration circulation pipeline, absorber is connected with generator by third conveying pipeline, generator is connected flue gas heat exchanger and forms heat exchange loop by another second heat exchange circulation pipeline, cooling tower is connected condenser and absorber respectively by first cooling circulation pipeline, second cooling circulation pipeline.By waste heat recovery to replace traditional electric refrigeration, reduce energy consumption, while reducing the heat pollution of high-temperature flue gas direct emission.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology, specifically a waste heat recovery device for calcining gypsum board raw materials. Background Technology

[0002] In the gypsum board production process, the calcination of raw materials (such as gypsum ore) is one of the core steps. This process usually needs to be carried out in a high-temperature environment, which generates a large amount of high-temperature flue gas. Currently, most gypsum board manufacturers treat these high-temperature flue gases in a relatively simple way, usually only performing preliminary dust removal before directly releasing them into the atmosphere.

[0003] In the calcination workshop, the continuous operation of the furnace significantly increases the ambient temperature, especially in summer when the workshop temperature can reach over 40°C, severely impacting the working environment for workers and the efficiency of equipment operation. Traditional solutions mainly rely on adding refrigeration equipment for cooling, but this method is not only energy-intensive but also fails to effectively utilize the waste heat resources generated during the calcination process. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model proposes a waste heat recovery device for calcination of gypsum board raw materials, which aims to achieve efficient recovery of waste heat from flue gas and convert it into cooling energy for use in office areas, thereby reducing energy consumption and enterprise operating costs.

[0005] To address the aforementioned technical problems, this utility model provides a waste heat recovery device for calcination of gypsum board raw materials, comprising a flue gas heat exchanger, a lithium bromide refrigeration unit, a cooling tower, and a blower. The lithium bromide refrigeration unit includes a generator, a condenser, an absorber, and an evaporator. The flue gas heat exchanger is connected to the generator via a first heat exchange circulation pipe. The generator is connected to the condenser via a first conveying pipe. The condenser is connected to the evaporator via a second conveying pipe. The evaporator is further connected to the blower via a refrigeration circulation pipe. The absorber is connected to the generator via a third conveying pipe. The generator and the flue gas heat exchanger form a heat exchange loop via a second heat exchange circulation pipe. The cooling tower is connected to the condenser and the absorber via a first cooling circulation pipe and a second cooling circulation pipe, respectively.

[0006] Preferably, the flue gas heat exchanger includes a housing assembly, with guide shrouds installed at both ends of the housing assembly, a water inlet assembly on one side of the housing assembly, and a water outlet assembly on the other side of the housing assembly.

[0007] Preferably, the housing assembly consists of multiple sets of heat exchange units connected in series. Each heat exchange unit includes a housing, and several sets of heat exchange coils are installed inside the housing. The inlet of each heat exchange coil is connected to the water inlet assembly, and the outlet of each heat exchange coil is connected to the water outlet assembly.

[0008] Preferably, the water inlet assembly includes multiple sets of water inlet pipe sections connected in series and corresponding one-to-one with the housing, and each water inlet pipe section has a water inlet on one side; the water outlet assembly includes multiple sets of water outlet pipe sections connected in series and corresponding one-to-one with the housing, and each water outlet pipe section has a water outlet on one side.

[0009] Preferably, an inlet regulating valve is provided between adjacent inlet pipe sections, and an outlet regulating valve is provided between adjacent outlet pipe sections.

[0010] Preferably, the heat exchange coil has multiple sets of fins on its tube wall.

[0011] Preferably, maintenance compartments are provided on both sides of the shell, the ports of the maintenance compartments are closed by cover plates, and the bent part of the heat exchange coil is located in the maintenance compartment.

[0012] Preferably, the cover plate is provided with a handle.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are: High-temperature flue gas enters the flue gas heat exchanger, transferring heat to the heat exchange medium. The heated medium then enters the generator of the lithium bromide refrigeration unit through the first heat exchange circulation pipe, serving as a heat source to drive the refrigeration cycle. Inside the generator, the dilute lithium bromide solution is heated and concentrated. The resulting water vapor enters the condenser for condensation. The condensate is then throttled and evaporates in the evaporator, absorbing heat. Cool air is then delivered to the areas requiring cooling by a blower. By recovering waste heat to replace traditional electric refrigeration, energy consumption is reduced, while simultaneously lowering the thermal pollution from direct emissions of high-temperature flue gas. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a flue gas heat exchanger. Figure 2 This is a schematic diagram of the heat exchange unit. Figure 3 This is a schematic diagram of the waste heat recovery and utilization process.

[0016] In the diagram: 1-Guide shroud, 2-Shell, 3-Inlet pipe section, 4-Inlet water control valve, 5-Inlet, 6-Cover plate, 7-Outlet pipe section, 8-Outlet, 9-Outlet water control valve, 10-Handle, 11-Heat exchange coil, 12-Maintenance compartment, 13-Flue gas heat exchanger, 14-Lithium bromide refrigeration unit, 15-Generator, 16-Condenser, 17-Cooling tower, 18-Blower, 19-Absorber, 20-Evaporator. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present utility model and are not configured to limit the present utility model. For those skilled in the art, the present utility model can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present utility model by illustrating examples of it.

[0018] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this utility model. It should also be noted in the description of this utility model that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] A waste heat recovery device for calcining gypsum board raw materials includes a flue gas heat exchanger 13, a lithium bromide refrigeration unit 14, a cooling tower 17, and a blower 18. The lithium bromide refrigeration unit 14 consists of a generator 15, a condenser 16, an absorber 19, and an evaporator 20.

[0020] The flue gas heat exchanger 13 is connected to the generator 15 through the first heat exchange circulation pipe. The generator 15 is connected to the condenser 16 through the first conveying pipe. The condenser 16 is connected to the evaporator 20 through the second conveying pipe. The evaporator 20 is also connected to the blower 18 through the refrigeration circulation pipe. The absorber 19 is connected to the generator 15 through the third conveying pipe. The generator 15 is also connected to the flue gas heat exchanger 13 through the second heat exchange circulation pipe to form a heat exchange loop. The cooling tower 17 is connected to the condenser 16 and the absorber 19 through the first cooling circulation pipe and the second cooling circulation pipe, respectively.

[0021] like Figure 1As shown, the flue gas heat exchanger 13 includes a housing assembly, with a water inlet assembly on one side and a water outlet assembly on the other side. Two sets of guide shrouds 1 are respectively installed at both ends of the housing assembly to guide the calcination flue gas into / out of the housing assembly and avoid local airflow turbulence.

[0022] The water inlet assembly consists of multiple sets of water inlet pipe sections 3 connected in series. Adjacent water inlet pipe sections 3 are connected by water inlet regulating valves 4. Each set of water inlet pipe sections 3 has a water inlet 5 on one side. The water outlet assembly consists of multiple sets of water outlet pipe sections 7 connected in series. Adjacent water outlet pipe sections 7 are connected by water outlet regulating valves 9. Each set of water outlet pipe sections 7 has a water outlet 8 on one side.

[0023] like Figure 2 As shown, the housing assembly consists of multiple sets of heat exchange units connected in series. Each heat exchange unit includes a shell 2, inside which several sets of heat exchange coils 11 are installed. The walls of the heat exchange coils 11 are provided with multiple sets of fins, which can increase the contact area with the flue gas and improve the heat transfer coefficient.

[0024] The number of shell sections 2 matches the number of inlet pipe sections 3 and outlet pipe sections 7. One end of the heat exchange coil 11 inside the shell section 2 is connected to the corresponding inlet pipe section 3, and the other end of the heat exchange coil 11 inside the shell section 2 is connected to the corresponding outlet pipe section 7.

[0025] The shell 2 encapsulates the heat exchange coil 11 as a relatively independent heat exchange unit. By regulating the opening and closing of the inlet water control valve 4 and the outlet water control valve 9, the separation or connection of different heat exchange units can be realized, thereby realizing the regulation of independent operation of a single unit or coordinated operation of multiple units to meet different load requirements.

[0026] Both sides of the shell 2 are equipped with maintenance compartments 12, and the bends of the heat exchange coils 11 are located in the maintenance compartments 12. The ports of the maintenance compartments 12 are sealed by cover plates 6, and handles 10 are provided on the cover plates 6. Personnel do not need to disassemble the entire housing assembly or shell 2; they only need to open the cover plates 6 to directly access the bends for cleaning accumulated dust, checking for corrosion, or repairing leaks.

[0027] like Figure 3 As shown, the lithium bromide refrigeration unit 14 achieves refrigeration through thermal energy drive, and the core process is as follows: The flue gas duct of the furnace is connected to the flue gas heat exchanger 13. The waste heat of the flue gas heats the circulating water in the first heat exchange circulation pipe through the heat exchange coil 11, and then transfers it to the generator 15. The lithium bromide solution in the generator 15 is heated, and the water evaporates to form refrigerant vapor. The refrigerant vapor enters the condenser 16 along the first conveying pipe. The concentration of the lithium bromide solution increases due to the reduction of water, and it becomes a concentrated solution. Cooling tower 17 delivers ambient temperature cooling water to condenser 16 through the first cooling circulation pipe. Refrigerant vapor and cooling water exchange heat in condenser 16. Refrigerant vapor condenses into liquid refrigerant water. Cooling water absorbs heat and its temperature rises. It then flows back to cooling tower 17 through the first cooling circulation pipe to cool down. Liquid refrigerant water enters the evaporator 20 through the second delivery pipeline (including the throttling valve) with reduced pressure. The evaporator 20 is in a low-pressure environment, where the liquid refrigerant water evaporates rapidly, absorbing the heat of the cold water in the refrigeration cycle pipeline and becoming refrigerant vapor again. The cold water in the refrigeration cycle pipeline is delivered to the coil of the blower 18 to provide refrigerant for the blower 18. Cooling tower 17 delivers ambient temperature cooling water to absorber 19 through a second cooling circulation pipe. Refrigerant vapor and cooling water exchange heat in absorber 19. The concentrated solution in generator 15 is sent to absorber 19 through a third conveying pipe for dilution, reforming into a dilute solution. The dilute solution in absorber 19 is then transported through a second heat exchange circulation pipe to an independent heat exchange unit for heating, and then sent to generator 15 to raise the temperature of the dilute solution when it re-enters generator 15.

[0028] The low-temperature chilled water produced by the evaporator 20 is transported to the office area's ventilation fan 18 through a refrigeration circulation pipe. The chilled water circulates within the coil built into the ventilation fan 18. After the ventilation fan 18 is started, it draws in indoor air and blows it over the surface of the coil. The air exchanges heat with the low-temperature coil, lowers its temperature, and is then returned to the room to achieve cooling.

[0029] The embodiments described above are not exhaustive, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, enabling those skilled in the art to effectively utilize the invention and its modifications. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A waste heat recovery device for calcining gypsum board raw materials, characterized in that: The system includes a flue gas heat exchanger (13), a lithium bromide refrigeration unit (14), a cooling tower (17), and a blower (18). The lithium bromide refrigeration unit (14) includes a generator (15), a condenser (16), an absorber (19), and an evaporator (20). The flue gas heat exchanger (13) is connected to the generator (15) through a first heat exchange circulation pipe. The generator (15) is connected to the condenser (16) through a first conveying pipe. The condenser (16) is connected to the evaporator (20) through a second conveying pipe. The evaporator (20) is also connected to the blower (18) through a refrigeration circulation pipe. The absorber (19) is connected to the generator (15) through a third conveying pipe. The generator (15) also forms a heat exchange loop with the flue gas heat exchanger (13) through a second heat exchange circulation pipe. The cooling tower (17) is connected to the condenser (16) and the absorber (19) through a first cooling circulation pipe and a second cooling circulation pipe, respectively.

2. The waste heat recovery device for calcination of gypsum board raw materials according to claim 1, characterized in that: The flue gas heat exchanger (13) includes a housing assembly, with guide shrouds (1) installed at both ends of the housing assembly, a water inlet assembly on one side of the housing assembly, and a water outlet assembly on the other side of the housing assembly.

3. The waste heat recovery device for calcination of gypsum board raw materials according to claim 2, characterized in that: The housing assembly consists of multiple sets of heat exchange units connected in series. Each heat exchange unit includes a housing (2), and several sets of heat exchange coils (11) are installed inside the housing (2). The inlet of the heat exchange coil (11) is connected to the water inlet assembly, and the outlet of the heat exchange coil (11) is connected to the water outlet assembly.

4. The waste heat recovery device for calcination of gypsum board raw materials according to claim 3, characterized in that: The water inlet assembly includes multiple sets of water inlet pipe sections (3) connected in series and corresponding one-to-one with the housing (2), and a water inlet (5) is provided on one side of the water inlet pipe section (3); the water outlet assembly includes multiple sets of water outlet pipe sections (7) connected in series and corresponding one-to-one with the housing (2), and a water outlet (8) is provided on one side of the water outlet pipe section (7).

5. The waste heat recovery device for calcination of gypsum board raw materials according to claim 4, characterized in that: An inlet regulating valve (4) is provided between adjacent inlet pipe sections (3), and an outlet regulating valve (9) is provided between adjacent outlet pipe sections (7).

6. The waste heat recovery device for calcination of gypsum board raw materials according to claim 3, characterized in that: The heat exchange coil (11) has multiple sets of fins on its tube wall.

7. The waste heat recovery device for calcination of gypsum board raw materials according to claim 3, characterized in that: Both sides of the shell (2) are provided with maintenance chambers (12), the ports of the maintenance chambers (12) are closed by cover plates (6), and the bent part of the heat exchange coil (11) is located in the maintenance chamber (12).

8. The waste heat recovery device for calcination of gypsum board raw materials according to claim 7, characterized in that: The cover plate (6) is provided with a handle (10).

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