Lithium bromide system for producing chilled water from hcn system

Abstract

The utility model relates to the technical field of chemical production, concretely relates to a lithium bromide system for making refrigerated water for HCN system, including frame and evaporimeter, and the evaporimeter includes the box that is fixed on the frame, the bottom intercommunication of box has the circulating water pipe, installs circulating water pump on circulating water pipe, is equipped with the baffle in the box, the baffle divides the box into two chambers, the bottom of baffle is opened and is communicated with two chambers's water hole, the top intercommunication of chamber has with the air pipe that communicates with absorber, is equipped with the cooling circuit that water flows through two chambers in the box, is equipped with the spraying structure that the coolant water is evenly sprayed on the cooling circuit in the box and passes, spraying structure communicates with condenser and circulating water pipe respectively, the utility model discloses can promote the effect of making refrigerated water.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical production, specifically to a lithium bromide system for producing chilled water using an HCN system. Background Technology

[0002] Hydrogen cyanide (HCN) has numerous applications as a reactant or synthetic intermediate in various synthetic pathways. In particular, it is used to prepare acetone cyanohydrin (used in the production of methyl methacrylate (MAM), such as PMMA (Altuglas). ® Plexiglas ® Hydrogen cyanide is a key reactant in the synthesis of methionine, a basic monomer of thermoplastic polymers, or as a synthetic intermediate for adiponitrile, which is essential for the preparation of polyamide 6.6 (Nylon). ® ) and synthetic intermediates of many chelating agents.

[0003] The chilled water source for our HCN system used in the production of hydrogen cyanide is a screw chiller unit. The screw chiller unit uses electricity as an energy source to produce chilled water. In many years of production practice, the unit has been operating relatively stably, but it has the disadvantage of high energy consumption. Since a large amount of surplus steam is generated during the production process of various chemical products in our company, we are now using this surplus steam to heat the generator in the lithium bromide system to produce chilled water, replacing the screw chiller unit and solving the problem of high energy consumption of the screw chiller unit.

[0004] A lithium bromide refrigeration system mainly consists of an evaporator, absorber, generator, and condenser. It also includes a vacuum system to maintain a vacuum environment within the system. The main steps for producing chilled water using a lithium bromide refrigeration system include: (1) Spray refrigerant water into the evaporator and simultaneously pass water into the cooling circuit inside the evaporator. The refrigerant water sprayed into the evaporator evaporates rapidly in a vacuum environment and absorbs heat, causing the water flowing through the cooling circuit to cool down quickly and produce chilled water. The refrigerant water that is not completely evaporated accumulates at the bottom of the evaporator. The refrigerant water at the bottom of the evaporator is sprayed back into the evaporator through the circulating water pipe and circulating pump.

[0005] (2) The water vapor generated by the evaporation of refrigerant water in the evaporator enters the absorber and is absorbed by the concentrated lithium bromide in the absorber, thereby preventing the water vapor in the evaporator from reaching saturation and enabling the refrigerant water in the evaporator to continue to evaporate rapidly.

[0006] (3) After the concentrated lithium bromide in the absorber absorbs water vapor, the concentrated lithium bromide is diluted into dilute lithium bromide. The dilute lithium bromide enters the generator, and the water in the dilute lithium bromide is evaporated by heating in the generator to obtain concentrated lithium bromide again. The concentrated lithium bromide is then passed back to the absorber.

[0007] (4) The water vapor in the generator enters the condenser. After being cooled by the condenser, the water vapor condenses into refrigerant water. The refrigerant water is passed from the condenser into the evaporator. Through steps (1), (2), (3) and (4), lithium bromide and refrigerant water are repeatedly recycled to produce chilled water.

[0008] However, since existing evaporators typically spray refrigerant water from top to bottom only, the upper cooling circuit can come into contact with more refrigerant water, thus absorbing heat from the rapidly evaporating refrigerant water to achieve cooling. After the refrigerant water is consumed by the upper cooling circuit, the lower circuit can come into contact with less refrigerant water, and the temperature of the refrigerant water in the lower circuit is higher than that in the upper circuit. This results in a poorer cooling effect in the lower cooling circuit, and the uneven distribution of refrigerant water leads to a decrease in the overall cooling effect of the cooling circuit. Utility Model Content

[0009] The present invention aims to provide a lithium bromide system for producing chilled water using an HCN system, which can improve the efficiency of chilled water production.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: 1) A lithium bromide system for producing chilled water using an HCN system, comprising a frame and an evaporator. The evaporator includes a housing fixed to the frame, with a circulating water pipe connected to the bottom of the housing and a circulating water pump installed on the circulating water pipe. The housing is equipped with a partition that divides the housing into two chambers. The bottom of the partition has a water passage connecting the two chambers, and the top of the chambers is connected to a vent pipe connected to the absorber. The housing is equipped with a cooling circuit that supplies water to flow through the two chambers. A spray structure is installed inside the housing to evenly spray refrigerant water onto the cooling circuit. The spray structure is connected to the condenser and the circulating water pipe respectively.

[0011] In this invention, a spray structure is used to spray refrigerant water from the condenser into the housing, while water is simultaneously supplied to the cooling circuit. The refrigerant water sprayed into the housing evaporates rapidly in a vacuum environment, absorbing heat from the water in the cooling circuit, thereby producing chilled water. Because the spray structure can evenly spray the refrigerant water onto the cooling circuit, the refrigerant water can evenly absorb heat from the water in the cooling circuit during the evaporation process, ensuring a consistent cooling effect throughout the entire cooling circuit and improving the chilled water production efficiency.

[0012] Meanwhile, as the water in the cooling circuit flows through the two chambers in sequence, it undergoes initial cooling in the first chamber by evaporating the refrigerant water and carrying away heat. It then undergoes secondary cooling in the second chamber. Since the water in the cooling circuit has already undergone initial cooling before entering the second chamber, there is less water vapor generated by the refrigerant water absorbing heat in the second chamber, which is easily absorbed by the absorber in a timely manner. This allows the low-pressure environment in the second chamber to be maintained relatively stably, enabling the refrigerant water to stably cool the water in the cooling circuit to the predetermined temperature.

[0013] During the above process, the refrigerant water that does not evaporate in time accumulates at the bottom of the two chambers. Since there are water passage holes at the bottom of the partition connecting the two chambers, the refrigerant water accumulated in the two chambers can communicate with each other. By starting the circulating water pump, this part of the refrigerant water can return to the spray structure through the circulating water pipe and be sprayed back into the tank from the spray structure, thus realizing the recycling of refrigerant water.

[0014] 2) The lithium bromide system for producing chilled water from an HCN system as described in 1), wherein: The cooling circuit includes two spiral tubes with a spiral structure, which are located in two chambers respectively. A straight pipe that passes through the partition connects the two spiral tubes. One of the spiral tubes has a water inlet and the other has a water outlet. It also includes a water inlet pipe and a water outlet pipe. The water inlet pipe passes through the box and connects to the water inlet, and the water outlet pipe passes through the box and connects to the water outlet.

[0015] In this invention, during the spraying of refrigerant water into the cooling circuit by the spray structure, water flows into the spiral tube through the inlet pipe from the inlet hole. The water entering the spiral tube then flows through a straight pipe into another spiral tube, and finally flows out through the outlet pipe. Since the two spiral tubes are located in two separate chambers, the water flows sequentially through both chambers during its flow within the spiral tubes and the straight pipe. After evaporating and absorbing heat in the first chamber to cool down, the water then evaporates and absorbs heat again in the second chamber, achieving a two-stage cooling process to produce chilled water and improving the chilled water production efficiency.

[0016] 3) The lithium bromide system for producing chilled water from an HCN system as described in 2), wherein: The spray structure includes two spray pipes that pass through the housing. The two spray pipes are located at the center of two spiral tubes. The top of the two spray pipes are connected to a refrigerant water pipe that supplies refrigerant water to the spray pipe. The refrigerant water pipe is connected to the condenser and the circulating water pipe. Several spray holes are evenly distributed on the spray pipe, and the spray holes are connected to nozzles for spraying refrigerant water.

[0017] In this invention, as water flows through the spiral tube, the refrigerant water in the condenser and circulating water pipe can enter the spray pipe through the refrigerant water pipe, and then be sprayed onto the spiral tube through the spray nozzles on the spray pipe. Since the spray pipe is located at the center of the spiral tube, the refrigerant water sprayed from the nozzles can contact the spiral tube evenly, thereby allowing the refrigerant water to evaporate evenly and absorb the heat of the water in the spiral tube, thus improving the effect of producing chilled water.

[0018] 4) The lithium bromide system for producing chilled water from an HCN system as described in 3), wherein: The spray pipe is rotatably connected to the refrigerant water pipe and is in communication with it. A rotating rod is fixedly connected to the bottom end of the spray pipe. The rotating rod passes through the bottom of the box and is rotatably connected to the bottom of the box. A negative pressure turbine is fixedly connected to the rotating rod. The negative pressure turbine is covered with a conduit. The bottom of the conduit is fixedly connected to the bottom of the box. A conduit hole is opened at the bottom of the conduit. A drive component for driving the rotating rod to rotate is provided at the bottom of the box.

[0019] In this invention, during the spraying of refrigerant water through the nozzles of the spray pipe, any refrigerant water that does not evaporate in time drips and accumulates at the bottom of the chamber. A drive mechanism can rotate a rotating rod, causing a negative pressure turbine on the rod to rotate. During rotation, the turbine discharges gas from the conduit upwards, creating a negative pressure within the conduit. This forces the refrigerant water accumulated at the bottom of the chamber to enter the conduit through the conduit hole and be sprayed upwards again, accelerating the evaporation and heat absorption of this portion of refrigerant water. This overall reduces the temperature within the chamber. Furthermore, the upward-sprayed refrigerant water contacts the spiral tube again, evaporating and absorbing heat, thus improving the chilled water production effect. Simultaneously, the rotating rod drives the spray pipe to rotate, ensuring that the refrigerant water sprayed from the nozzles contacts the spiral tube more evenly, further enhancing the chilled water production effect.

[0020] 5) The driving component includes a motor installed at the bottom of the housing. The output shaft of the motor is fixedly connected to a gear shaft, which is rotatably connected to the bottom of the housing. A first gear is fixedly connected to the gear shaft, and the first gear meshes with two second gears. The two second gears are respectively fixedly connected to two rotating rods.

[0021] In this invention, a motor drives a gear shaft to rotate, which in turn drives a first gear to rotate, which in turn drives a second gear to rotate, which in turn drives a rotating rod to rotate. The rotating rod then drives a negative pressure turbine and a spray pipe to rotate. During the rotation of the negative pressure turbine, the refrigerant water accumulated at the bottom of the chamber enters the conduit through the conduit hole and is then sprayed upwards, accelerating the evaporation rate of this refrigerant water and reducing the overall temperature inside the chamber. The upward-sprayed refrigerant water then comes into contact with the spiral tube again to evaporate and absorb heat, thereby improving the production of chilled water. At the same time, the rotating spray pipe allows the refrigerant water sprayed from the nozzle to contact the spiral tube more evenly, further improving the production of chilled water.

[0022] Compared with the prior art, this utility model also has the following technical effects: In this invention, refrigerant water from the condenser and circulating water pipes enters the spray pipe through the refrigerant water pipe, while water is simultaneously supplied to the spiral tube connected to it through the inlet pipe. The water flows through the straight pipe into another spiral tube and then out through the outlet pipe. Because the refrigerant water entering the spray pipe can be evenly sprayed onto the spiral tube through the nozzle, the refrigerant water can make uniform contact with the spiral tube, thereby allowing the refrigerant water to evaporate and absorb heat from the water in the spiral tube evenly, improving the chilled water production effect. Since the two spiral tubes are located in two chambers respectively, the water can flow through the two chambers sequentially during the flow of the spiral tube and the straight pipe. After evaporating and absorbing heat in the first chamber to cool down, it is cooled down again in the second chamber by evaporating and absorbing heat from the refrigerant water, thus performing a two-stage cooling process to produce chilled water, further improving the chilled water production effect.

[0023] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the lithium bromide system for producing chilled water using an HCN system, as described in this utility model. Figure 2 for Figure 1 Side view of surface AA in the middle.

[0025] The reference numerals in the accompanying drawings include: frame 1, housing 2, circulating water pipe 3, circulating water pump 4, partition 5, chamber 6, vent pipe 7, water inlet 8, spiral pipe 9, straight pipe 10, inlet pipe 11, outlet pipe 12, spray pipe 13, nozzle 14, refrigerant water pipe 15, rotating rod 16, negative pressure turbine 17, guide tube 18, guide tube hole 19, motor 20, gear shaft 21, first gear 22, and second gear 23. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0031] See the example. Figure 1 and Figure 2 As shown, this embodiment is a lithium bromide system for producing chilled water using an HCN system, including a frame 1 and an evaporator. The evaporator includes a housing 2 fixed on the frame 1. A circulating water pipe 3 is connected to the bottom of the housing 2, and a circulating water pump 4 is installed on the circulating water pipe 3. A partition 5 is welded inside the housing 2, which divides the housing 2 into two chambers 6. A water passage hole 8 connecting the two chambers 6 is opened at the bottom of the partition 5, and a vent pipe 7 connected to the absorber is connected to the top of the chamber 6.

[0032] Two spiral tubes 9 are located in two chambers 6 respectively. A straight pipe 10 that passes through the partition 5 connects the two spiral tubes 9. The straight pipe 10 is welded and fixed to the partition 5. One of the two spiral tubes 9 has a water inlet hole and the other has a water outlet hole. It also includes a water inlet pipe 11 and a water outlet pipe 12. The water inlet pipe 11 passes through the box body 2 and connects to the water inlet hole. The water outlet pipe 12 passes through the box body 2 and connects to the water outlet hole. Both the water inlet pipe 11 and the water outlet pipe 12 are welded and fixed to the box body 2.

[0033] Two spray pipes 13 are located at the center of two spiral pipes 9, respectively. Several spray holes are evenly distributed on each spray pipe 13, and these spray holes are connected to nozzles 14 for spraying refrigerant water. The top of each spray pipe 13 extends through the top of the housing 2 and is rotatably connected to the housing 2 via a bearing. The tops of both spray pipes 13 are connected to a refrigerant water pipe 15 for supplying refrigerant water into the spray pipe 13. The spray pipe 13 is rotatably connected to the refrigerant water pipe 15 via a rotary joint. The refrigerant water pipe 15 is connected to the condenser and the circulating water pipe 3. A rotating rod 16 is welded and fixed to the bottom of each spray pipe 13, and the rotating rod 16 passes through the bottom of the housing 2 and… The housing 2 is rotatably connected to the rotating rod 16 via bearings. A negative pressure turbine 17 is welded and fixed on the rotating rod 16. A conduit 18 is sleeved on the negative pressure turbine 17. The bottom of the conduit 18 is fixedly connected to the bottom of the housing 2. A conduit hole 19 is opened at the bottom of the conduit 18. A motor 20 is installed at the bottom of the housing 2 via bolts and nuts. A gear shaft 21 is fixedly connected to the output shaft of the motor 20. The gear shaft 21 is rotatably connected to the bottom of the housing 2 via bearings. A first gear 22 is connected to the gear shaft 21 via a key. The first gear 22 meshes with two second gears 23. The two second gears 23 are respectively connected to the two rotating rods 16 via keyes.

[0034] In this embodiment, refrigerant water in the condenser is introduced into spray pipe 13 through refrigerant water pipe 15. The refrigerant water in spray pipe 13 is sprayed from nozzle 14 through spray hole onto spiral tube 9. At the same time, water is introduced into spiral tube 9 through water inlet pipe 11. The water entering spiral tube 9 enters another spiral tube 9 through straight pipe 10, and then flows out through water outlet pipe 12. The refrigerant water sprayed onto spiral tube 9 evaporates rapidly in a vacuum environment, taking away the heat of the water in spiral tube 9, thereby producing chilled water. During this process, the water vapor generated by the evaporation of refrigerant water enters the absorber through vent pipe 7 and is absorbed by concentrated lithium bromide.

[0035] Since the spray pipe 13 is located at the center of the spiral tube 9 and the nozzles 14 are evenly distributed on the spray pipe 13, the refrigerant water sprayed by the nozzles 14 can contact the spiral tube 9 evenly, so that the refrigerant water can evaporate evenly and absorb the heat of the water in the spiral tube 9, thereby improving the effect of producing chilled water.

[0036] Meanwhile, as the water flows through the spiral tube 9 in the first chamber 6, it undergoes initial cooling by the evaporation of the refrigerant water, which carries away heat. Then, it undergoes secondary cooling as it flows through the spiral tube 9 in the second chamber 6. Since the water flowing in the spiral tube 9 in the second chamber 6 has already undergone initial cooling, there is less water vapor generated by the refrigerant water absorbing heat in the second chamber 6, which is easily absorbed by the absorber in a timely manner. This allows the low-pressure environment in the second chamber 6 to be maintained relatively stably, enabling the refrigerant water to stably cool the water in the spiral tube 9 to the predetermined temperature.

[0037] During the above process, the refrigerant water that does not evaporate in time will accumulate at the bottom of the two chambers 6. Since the bottom of the partition 5 has a water passage hole 8 connecting the two chambers 6, the refrigerant water accumulated in the two chambers 6 is interconnected. By starting the circulating water pump 4, this part of the refrigerant water can return to the refrigerant water pipe 15 through the circulating water pipe 3, and then enter the spray pipe 13 from the refrigerant water pipe 15 and be sprayed into the chamber 6 from the nozzle 14, realizing the recycling of refrigerant water. At the same time, by starting the motor 20, the gear shaft 21 is driven to rotate, the gear shaft 21 drives the first gear 22 to rotate, and the first gear 22 drives the second gear 23 to rotate. The second gear 23 drives the rotating rod 16 to rotate, and the rotating rod 16 drives the negative pressure turbine 17 and the spray pipe 13 to rotate. During the rotation of the negative pressure turbine 17, the refrigerant water accumulated at the bottom of the chamber 6 can enter the conduit 18 through the conduit hole 19 and then be sprayed upward, which increases the evaporation rate of this part of the refrigerant water and reduces the temperature inside the chamber 6 as a whole. The refrigerant water sprayed upward comes into contact with the spiral tube 9 again to evaporate and absorb heat, thereby improving the effect of producing chilled water. At the same time, the rotating spray pipe 13 can make the refrigerant water sprayed by the nozzle 14 contact the spiral tube 9 more evenly, further improving the effect of producing chilled water.

[0038] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this invention. These modifications and improvements should also be considered within the scope of protection of this invention, and will not affect the effectiveness of the implementation of this invention or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A lithium bromide system for producing chilled water using an HCN system, comprising a frame and an evaporator, the evaporator comprising a housing fixed to the frame, the bottom of the housing being connected to a circulating water pipe, and a circulating water pump being installed on the circulating water pipe, characterized in that, The box is equipped with a partition that divides the box into two chambers. The bottom of the partition has a water passage connecting the two chambers. The top of each chamber is connected to a vent pipe that connects to the absorber. The box is equipped with a cooling circuit that supplies water to flow through the two chambers. The box is also equipped with a spray structure that evenly sprays refrigerant water onto the cooling circuit. The spray structure is connected to the condenser and the circulating water pipe, respectively.

2. The lithium bromide system for producing chilled water using an HCN system according to claim 1, characterized in that: The cooling circuit includes two spiral tubes with a spiral structure, which are located in two chambers respectively. A straight pipe that penetrates a partition connects the two spiral tubes. One of the spiral tubes has a water inlet hole, and the other spiral tube has a water outlet hole. It also includes a water inlet pipe and a water outlet pipe. The water inlet pipe passes through the housing and communicates with the water inlet hole, and the water outlet pipe passes through the housing and communicates with the water outlet hole.

3. The lithium bromide system for producing chilled water using an HCN system according to claim 1, characterized in that: The spray structure includes two spray pipes that pass through the housing. The two spray pipes are located at the center of two spiral tubes. The top ends of the two spray pipes are connected to a refrigerant water pipe that supplies refrigerant water to the spray pipes. The refrigerant water pipe is connected to the condenser and the circulating water pipe. Several spray holes are evenly distributed on the spray pipes. The spray holes are connected to nozzles for spraying refrigerant water.

4. The lithium bromide system for producing chilled water from an HCN system according to claim 3, characterized in that: The spray pipe is rotatably connected to and communicates with the refrigerant water pipe. A rotating rod is fixedly connected to the bottom end of the spray pipe. The rotating rod passes through the bottom of the box and is rotatably connected to the bottom of the box. A negative pressure turbine is fixedly connected to the rotating rod. A conduit is sleeved on the negative pressure turbine. The bottom of the conduit is fixedly connected to the bottom of the box. A conduit hole is opened at the bottom of the conduit. A driving component for driving the rotating rod to rotate is provided at the bottom of the box.

5. The lithium bromide system for producing chilled water from an HCN system according to claim 4, characterized in that: The driving component includes a motor installed at the bottom of the housing. The output shaft of the motor is fixedly connected to a gear shaft, which is rotatably connected to the bottom of the housing. A first gear is fixedly connected to the gear shaft, and the first gear meshes with two second gears. The two second gears are respectively fixedly connected to two rotating rods.

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