Lithium bromide unit with waste heat recovery function

Abstract

The invention belongs to the technical field of heat energy recovery, and particularly relates to a lithium bromide unit with a waste heat recovery function. The hot water system comprises a water heat exchanger, a circulating pump, a control valve and a pipeline system; the hot water system is used for providing heat energy for the lithium bromide host; the cold water system comprises a circulating pump, a control valve, a control instrument and a pipeline system; the cooling water system comprises a cooling tower, a circulating pump, a control valve and a pipeline system; the cooling tower comprises a water tank, a water inlet pipe, a lower-layer tower body and an upper-layer tower body; the lower-layer tower body is fixedly connected with the water tank; the produced hot water serves as driving energy, the interior of the lithium bromide unit is vacuumized, the boiling point of water is reduced, cold water is produced through the lithium bromide unit, electric energy is saved by reducing the load of a factory refrigeration station, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat energy recovery, and in particular to a lithium bromide unit with a waste heat recovery function. Background Art

[0002] On-site investigations found that the terminal part of industrial exhaust gas has high temperature (≥200℃), which is discharged after being cooled down after mixing with fresh air. The traditional heat recovery method is to set up air-to-water or air-to-air heat exchange at the terminal to provide hot water or preheat the fresh air to achieve the purpose of energy saving and consumption reduction. When the workshop does not have this part of energy-saving demand, the high-temperature gas is directly discharged, resulting in energy loss.

[0003] Most industrial workshops have a demand for cold water throughout the year, and refrigeration stations consume electricity to output cold water, resulting in electricity loss. Currently, lithium bromide units can use thermal energy for refrigeration, but the refrigeration effect and efficiency are relatively general. How to use lithium bromide units to significantly reduce the load of refrigeration stations and achieve energy conservation and emission reduction is of great significance. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a lithium bromide unit with a waste heat recovery function, which can produce industrial cold water while recovering industrial heat energy, thereby achieving the diversity of uses for heat energy recovery, and aims to solve the problems in the background technology.

[0005] In order to achieve the above technical objectives, the specific technical scheme of the present invention is as follows: a lithium bromide unit with waste heat recovery function proposed by the present invention comprises: a hot water system, the hot water system comprises a water heat exchanger, a circulating pump, a control valve and a piping system; a lithium bromide host, the hot water system is used to provide heat energy to the lithium bromide host; a cold water system, the cold water system comprises a circulating pump, a control valve, a control instrument, and a piping system; a cooling water system, the cooling water system comprises a cooling tower, a circulating pump, a control valve and a piping system; the cooling tower comprises a water pool, a water inlet pipe, a lower tower body and an upper tower body, the lower tower body is fixed to the water pool The lower tower body is connected, and an air inlet net is provided between the lower tower body and the water pool, and air enters the interior of the cooling tower through the air inlet net, and an outlet pipe is provided on the water pool; the inner tower body is fixedly connected to the interior of the lower tower body, and a ventilation duct is formed between the outer wall of the inner tower body and the outer wall of the lower tower body, and the upper end of the ventilation duct is communicated with the interior of the upper tower body, and fillers are provided in the inner tower body and the upper tower body, and a shielding component is provided between the two fillers; the water inlet pipe is vertically arranged at the center of the cooling tower, and the lower end of the water inlet pipe extends to the outside of the cooling tower, and a water pump is connected to the water inlet pipe, the shielding component is sleeved on the water inlet pipe, and a fan is installed above the upper tower body.

[0006] As a preferred technical solution of the present invention, the upper end of the water inlet pipe is rotatably connected to a water distribution seat, a plurality of watering pipes are evenly and fixedly connected to the water distribution seat along its circumference, and a plurality of watering holes are evenly arranged on the side of the watering pipe along its length direction.

[0007] As a preferred technical solution of the present invention, the shielding assembly includes a connecting pipe, which is installed on the surface of the water inlet pipe. A pair of threaded sleeves are threadedly connected at both ends of the water inlet pipe. A plurality of support frames are evenly fixedly connected to the surface of the threaded sleeve along its circumference, and the support frames are in contact with the filler surface.

[0008] As a preferred technical solution of the present invention, the shielding assembly also includes a plurality of shielding plates that can together form a circle. The shielding plates are in a fan-shaped structure and are rotatably connected to the surface of the connecting pipe. The shielding plates are used to drain water dripping from the upper layer of filler into the ventilation duct.

[0009] As a preferred technical solution of the present invention, a rotating rod is fixedly connected to the baffle plate, the rotating rod is rotatably connected to the connecting tube, a driven gear is fixedly connected to the rotating rod, a rotating seat is rotatably connected to the surface of the connecting tube, and a driving gear meshing with the driven gear is fixedly connected to the rotating seat.

[0010] As a preferred technical solution of the present invention, a gear ring is fixedly mounted on the rotating seat, a driving motor is mounted on the rotating seat, and a driving gear is fixedly connected to a rotating shaft of the driving motor.

[0011] As a preferred technical solution of the present invention, a plurality of water guide grooves are provided on the surface of the shielding plate, and mutually matching sealing grooves are provided on both sides of the shielding plate.

[0012] As a preferred technical solution of the present invention, a water collector is installed on the top of the upper tower body.

[0013] The beneficial effects of the present invention are: 1. The present invention uses the produced hot water as a driving energy source, evacuates the interior of the lithium bromide unit to a vacuum state, reduces the boiling point of water, produces cold water through the lithium bromide unit, and saves electricity by reducing the load of the factory refrigeration station, thereby achieving the purpose of energy conservation and emission reduction.

[0014] 2. The cooling tower of the present invention is provided with an upper tower body, a lower tower body and an inner tower body, and a shielding component is provided between the upper tower body and the lower tower body, thereby controlling the number of filler layers used and the cooling effect of the cooling tower. A ventilation duct is provided between the inner tower body and the lower tower body, thereby allowing new air to enter the upper filler through the ventilation duct, thereby improving the cooling effect of the cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the process of a lithium bromide unit with waste heat recovery function proposed by the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of the cooling tower proposed by the present invention.

[0017] Figure 3 This is a schematic structural diagram of the shielding assembly proposed by the present invention when it is in a closed state.

[0018] Figure 4 This is a schematic diagram of the shielding assembly proposed by the present invention in an open state.

[0019] Figure 5 This is a schematic structural diagram of the shielding plate proposed in the present invention.

[0020] Figure 6 This is a schematic structural diagram of the connecting pipe proposed by the present invention.

[0021] In the figure: 1. hot water system; 2. lithium bromide host; 3. cold water system; 4. cooling water system; 5. cooling tower; 51. upper tower body; 52. lower tower body; 53. water tank; 54. shielding assembly; 541. connecting pipe; 542. threaded sleeve; 543. support frame; 544. rotating seat; 545. driving gear; 546. gear ring; 547. driving motor; 548. driving gear; 55. shielding plate; 551. driven gear; 552. rotating rod; 553. water guide groove; 554. sealing groove; 56. inner tower body; 57. ventilation duct; 58. filler; 59. air inlet net; 510. water inlet pipe; 511. water distribution seat; 512. sprinkler pipe; 513. water collector; 514. fan; 515. water pump. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] This embodiment discloses a lithium bromide unit with waste heat recovery function, such as Figure 1As shown, it includes: a hot water system 1, which includes a water heat exchanger, a circulation pump, a control valve and a pipeline system; the specific structure is that a heat exchange box is set at the KPR terminal air duct, a pneumatic valve is set at the inlet and outlet of the box, and an electric control valve is set at the bypass air duct; a system consisting of a circulation pump, an instrument thermal resistor / pressure switch, a control valve, an electric valve, etc. is set near the heat exchanger to achieve stable and continuous output of hot water; an exhaust valve is set at the highest point of the pipeline to exhaust the air in the pipe; a safety valve is set on the hot water outlet side to ensure overpressure relief to ensure the safety of the system; the hot water system and the lithium bromide host signal are interlocked, when the host needs to be shut down for maintenance, the air duct is switched to the bypass mode and then the circulation pump is turned off; among them, the hot water pipeline adopts DN100 seamless pipe and is insulated with 80mm rock wool, which can prevent energy loss and avoid scalding.

[0024] Lithium bromide host 2, hot water system 1 is used to provide heat energy to lithium bromide host 2, the refrigeration power selection of the unit is matched with the heat power of hot water; lithium bromide aqueous solution is only an absorbent, and the water in it is the refrigerant; the purpose of refrigeration is achieved by absorbing heat by evaporating at a low boiling point of water under a high vacuum state; first, the vacuum pump pumps the lithium bromide host 2 to a high vacuum state to ensure that the water boils at an extremely low temperature; since the boiling point pressure of lithium bromide aqueous solution is lower than that of refrigerant water, there is a boiling point difference between the two, so the former has the ability to absorb water vapor, thus providing conditions for the refrigerant water to boil continuously; after the refrigerant water enters the evaporation, The refrigerant pump sprays it on the surface of the heat exchange tube through the replenisher. The refrigerant water absorbs the heat of the cold water in the tube, boils at low temperature to form refrigerant vapor again, and produces low-temperature cold water at the same time; the concentrated solution directly enters the absorber after passing through the heat exchanger, and is sprayed on the absorber heat exchange tube through the replenisher; on the one hand, the concentrated solution absorbs the refrigerant vapor produced by the evaporator and becomes a dilute solution itself; on the other hand, the absorption heat released when absorbing the refrigerant vapor is transferred to the cooling water; the refrigeration cycle is the cycle of the lithium bromide aqueous solution changing from dilute to concentrated and then from concentrated to dilute in the machine, and the refrigerant water changing from liquid to vapor and then from vapor to liquid; the two cycles are carried out simultaneously and repeatedly.

[0025] Cold water system 3, cold water system 3 includes a circulation pump, a control valve, a control instrument, and a piping system; the cold water intake point is set at the return pipe of the cold water network, and enters the lithium bromide main unit through the circulation pump; after the cold water is produced, it is merged into the return pipe of the original network to reduce the system return water temperature of the network, thereby reducing the load of the cold station and achieving energy saving; a flow switch is set at the front end of the water intake point of the network and interlocked with the refrigeration unit and the cold water pump. When there is no flow in the network, the system shuts down; a pressure switch and a pump interlock are set at the water intake point and return point of the power main network to ensure that the inlet and return pressures are equal, thereby ensuring the stability of the original network; the cold water pipeline adopts DN150 galvanized pipe and rubber and plastic insulation to prevent the occurrence of condensed water.

[0026] The cooling water system 4 includes a cooling tower 5, a circulation pump, a control valve and a piping system; the cooling tower 5 is placed outdoors for heat dissipation, and the cooling pipeline adopts a DN250 galvanized pipe and is insulated with rubber and plastic to ensure the stability of the process temperature and the appearance of condensed water.

[0027] like Figure 2-Figure 6 As shown, the cooling tower 5 includes a pool 53, a water inlet pipe 510, a lower tower body 52 and an upper tower body 51. The diameter of the upper tower body 51 is smaller than that of the lower tower body 52. ​​A water collector 513 is installed on the top of the upper tower body 51 to reduce the evaporation of water. The recovered water re-enters the pool 53. The lower tower body 52 is fixedly connected to the pool 53, and an air inlet net 59 is provided between the lower tower body 52 and the pool 53. Air enters the interior of the cooling tower 5 through the air inlet net 59. An outlet pipe is provided on the pool 53 to facilitate the discharge of water in the pool 53. An inner tower body 56 is fixedly connected to the interior of the lower tower body 52. ​​The inner tower body 56 is transparent from top to bottom, and the inner tower body 56 has the same diameter as the upper tower body 51. A ventilation duct 57 is formed between the outer wall of the inner tower body 56 and the inner wall of the lower tower body 52. ​​The upper end of the ventilation duct 57 is connected to the interior of the upper tower body 51. The inner tower body 56 The upper tower body 51 is provided with fillers 58, and a shielding assembly 54 is provided between the two fillers 58. The shielding assembly 54 is used to close the lower tower body 52. ​​During operation, when the shielding assembly 54 is opened, a part of the new air flows from the fillers 58 in the lower tower body 52 to the fillers 58 in the upper tower body 51, and the other part of the new air directly enters the fillers 58 in the upper tower body 51 through the ventilation duct 57. Compared with the prior art in which the upper and lower fillers are in contact with each other and no new air enters the fillers in the upper layer, this embodiment is provided with ventilation ducts 57 and shielding assemblies 54, so that new air can enter the fillers 58 in the upper and lower layers, thereby improving the cooling effect of the cooling tower on water; when the shielding assembly 54 is closed, the lower fillers 58 are in an inoperative state, and only the upper fillers 58 are in an operating state, thereby controlling the cooling temperature and efficiency of the cooling tower.

[0028] Among them, the water inlet pipe 510 is vertically arranged at the center of the cooling tower 5, and the lower end of the water inlet pipe 510 extends to the outside of the cooling tower 5, and the water inlet pipe 510 is connected to a water pump 515 for transporting water to the top of the cooling tower 5, the shielding component 54 is sleeved on the water inlet pipe 510, and a fan 514 is installed above the upper tower body 51 for exhausting air; the upper end of the water inlet pipe 510 is rotatably connected to a water diversion seat 511, the water diversion seat 511 is sealed with the water inlet pipe 510, the water diversion seat 511 is arranged above the filler, and a plurality of sprinkler pipes 512 are evenly fixedly connected to the water diversion seat 511 along its circumference, and a plurality of sprinkler holes are evenly arranged on the side of the sprinkler pipe 512 along its length direction. Since the sprinkler holes are arranged on the side of the sprinkler pipe 512, there will be a reaction force when the sprinkler pipe 512 sprinkles water, which pushes the water diversion seat 511 to rotate, and then the water is evenly sprinkled on the filler 58.

[0029] like Figure 3-Figure 6 As shown, the shielding assembly 54 includes a connecting pipe 541, which is installed on the surface of the water inlet pipe 510. A pair of threaded sleeves 542 are threadedly connected at both ends of the water inlet pipe 510. A plurality of support frames 543 are evenly fixedly connected to the surface of the threaded sleeve 542 along its circumference, and the support frames 543 are in contact with the surface of the filler 58; the shielding assembly 54 also includes a plurality of shielding plates 55 that can together form a circle. In this embodiment, 8 shielding plates 55 are provided. The shielding plates 55 are in a fan-shaped structure. The shielding plates 55 are rotatably connected to the surface of the connecting pipe 541. The shielding plates 55 are used to drain water dripping from the upper filler 58 into the ventilation duct 57; a rotating rod 552 is fixedly connected to the shielding plate 55, and the rotating rod 552 is rotatably connected to the connecting pipe 541. A driven gear 551 is fixedly connected to the rotating rod 552. A rotating seat 544 is rotatably connected to the surface of the connecting pipe 541. The driving gear 545 meshing with the driven gear 551 is fixedly connected to the moving seat 544; wherein, a gear ring 546 is fixedly installed on the rotating seat 544, a driving motor 547 is installed on the rotating seat 544, and a driving gear 548 is fixedly connected to the rotating shaft of the driving motor 547; the driving motor 547 drives the rotating seat 544 to rotate, drives the driving gear 545 to rotate, and then drives the baffle plate 55 to rotate. When the baffle plate 55 rotates to a horizontal state, the shielding assembly 54 is in a closed state, and the baffle plates 55 together form a circular structure, closing the inner tower body 56. Water droplets from the upper filler 58 fall on the baffle plate 55, and then flow into the pool 53 through the ventilation duct 57; when the baffle plate 55 rotates to a vertical state, the shielding assembly 54 is in an open state, and water dripping from the upper filler 58 flows into the lower filler 58 to continue cooling.

[0030] Preferably, a plurality of water guiding grooves 553 are provided on the surface of the baffle plate 55 to facilitate the drainage of water into the ventilation duct 57, and sealing grooves 554 that cooperate with each other are provided on both sides of the baffle plate 55. The sealing grooves 554 on both sides of the same baffle plate 55 are staggered in the vertical direction, so that adjacent baffle plates 55 are sealed.

[0031] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium bromide unit with waste heat recovery function, characterized in that: include: A hot water system (1), the hot water system (1) comprising a water heat exchanger, a circulation pump, a control valve and a pipeline system; A lithium bromide host (2), wherein the hot water system (1) is used to provide heat energy to the lithium bromide host (2), and the interior of the lithium bromide host (2) is evacuated to a vacuum state; A cold water system (3), the cold water system (3) comprising a circulation pump, a control valve, a control instrument, and a pipeline system; A cooling water system (4), the cooling water system (4) comprising a cooling tower (5), a circulation pump, a control valve and a piping system; The cooling tower (5) comprises a water pool (53), a water inlet pipe (510), a lower tower body (52) and an upper tower body (51); the lower tower body (52) is fixedly connected to the water pool (53); an air inlet net (59) is provided between the lower tower body (52) and the water pool (53); air enters the interior of the cooling tower (5) through the air inlet net (59); and a water outlet pipe is provided on the water pool (53); The lower tower body (52) is fixedly connected to an inner tower body (56), and a ventilation duct (57) is formed between an outer wall of the inner tower body (56) and an inner wall of the lower tower body (52), and an upper end of the ventilation duct (57) is connected to the interior of the upper tower body (51), and fillers (58) are provided in both the inner tower body (56) and the upper tower body (51), and a shielding component (54) is provided between the two fillers (58); The water inlet pipe (510) is vertically arranged at the center of the cooling tower (5), and the lower end of the water inlet pipe (510) extends to the outside of the cooling tower (5), and a water pump (515) is connected to the water inlet pipe (510), the shielding component (54) is sleeved on the water inlet pipe (510), and a fan (514) is installed above the upper tower body (51).

2. A lithium bromide unit with waste heat recovery function according to claim 1, characterized in that: The upper end of the water inlet pipe (510) is rotatably connected to a water distribution seat (511), a plurality of watering pipes (512) are evenly and fixedly connected to the water distribution seat (511) along its circumference, and a plurality of watering holes are evenly arranged on the side of the watering pipe (512) along its length.

3. A lithium bromide unit with waste heat recovery function according to claim 2, characterized in that: The shielding assembly (54) comprises a connecting pipe (541), the connecting pipe (541) being mounted on the surface of the water inlet pipe (510), a pair of threaded sleeves (542) being threadedly connected at both ends of the water inlet pipe (510), a plurality of support frames (543) being evenly fixedly connected to the surface of the threaded sleeve (542) along its circumference, and the support frames (543) being in contact with the surface of the filler (58).

4. A lithium bromide unit with waste heat recovery function according to claim 3, characterized in that: The shielding assembly (54) further comprises a plurality of shielding plates (55) that can together form a circle, the shielding plates (55) being in a fan-shaped structure, the shielding plates (55) being rotatably connected to the surface of the connecting pipe (541), and the shielding plates (55) being used to guide water dripping from the filler (58) on the upper layer into the ventilation duct (57).

5. A lithium bromide unit with waste heat recovery function according to claim 4, characterized in that: A rotating rod (552) is fixedly connected to the shielding plate (55), the rotating rod (552) is rotatably connected to the connecting tube (541), a driven gear (551) is fixedly connected to the rotating rod (552), a rotating seat (544) is rotatably connected to the surface of the connecting tube (541), and a driving gear (545) meshing with the driven gear (551) is fixedly connected to the rotating seat (544).

6. A lithium bromide unit with waste heat recovery function according to claim 5, characterized in that: A gear ring (546) is fixedly mounted on the rotating seat (544), a driving motor (547) is mounted on the rotating seat (544), and a driving gear (548) is fixedly connected to the rotating shaft of the driving motor (547).

7. A lithium bromide unit with waste heat recovery function according to claim 6, characterized in that: The surface of the shielding plate (55) is provided with a plurality of water guide grooves (553), and both sides of the shielding plate (55) are provided with sealing grooves (554) that cooperate with each other.

8. The lithium bromide unit with waste heat recovery function according to claim 7, characterized in that: A water collector (513) is installed on the top of the upper tower body (51).

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