System for improving vacuum degree stability of lithium bromide ice unit

Abstract

The utility model discloses a system for improving the vacuum degree stability of a lithium bromide ice unit, and belongs to the technical field of industrial refrigeration. According to the technical scheme, the lithium bromide ice sampler comprises a controller, a lithium bromide ice unit, an ejector, a liquid storage tank and a sampler, the lithium bromide ice unit is connected with a chilled water outlet pipeline and a chilled water inlet pipeline; the lithium bromide ice unit is provided with a pressure sensor, the pressure sensor is electrically connected with the controller, the lithium bromide ice unit is further provided with a demister, the chilled water outlet pipeline is provided with a temperature sensor, and the temperature sensor is electrically connected with the controller; the jet device is connected with a gas source gas inlet pipeline and a jet device outlet pipeline, a nitrogen flow meter and a gas source adjusting valve are arranged on the gas source gas inlet pipeline, and the nitrogen flow meter and the gas source adjusting valve are both electrically connected with the controller. According to the vacuumizing device of the lithium bromide ice unit, related devices and pipelines of the jet device are additionally arranged, and the vacuum degree of the absorber is controlled through the Venturi effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial refrigeration, and particularly relates to a system for improving the vacuum stability of a lithium bromide ice unit. Background Art

[0002] In industrial refrigeration systems, the vacuum degree of lithium bromide ice units affects the service life and operational safety of the units. To ensure the safe and stable operation of lithium bromide ice units, the vacuum degree of lithium bromide ice units is very important. In the chemical industry, lithium bromide ice units mostly use vacuum pumps to evacuate. However, in summer, high humidity and high temperature cause the cooling water inlet temperature of the lithium bromide ice units to rise, reducing the heat carried away, which will cause the vacuum degree of the lithium bromide ice units to decrease. The rise in cold water outlet temperature affects the operational safety of the unit and causes pipeline crystallization, resulting in waste of resources and increased costs. However, frequent use of vacuum pumps to evacuate will cause the vacuum pump to be damaged or malfunction. When using vacuum pumps to evacuate, abnormal vacuum conditions cannot be adjusted and handled in time. Once the vacuum degree is abnormal, it is very easy to cause the refrigeration unit to interlock and shut down, affecting production progress and causing unnecessary economic losses. Utility Model Content

[0003] The utility model provides a system for improving the vacuum stability of a lithium bromide ice unit. The vacuum pumping device of the lithium bromide ice unit is added with ejector-related devices and pipelines, and the vacuum degree of the absorber is controlled by using the Venturi effect.

[0004] The technical solution of the utility model is:

[0005] The system for improving the vacuum stability of a lithium bromide ice unit comprises a controller and a lithium bromide ice unit, an ejector, a liquid storage tank and a sampler connected in sequence through pipelines; the lithium bromide ice unit is connected to a chilled water outlet pipeline and a chilled water inlet pipeline; the lithium bromide ice unit is provided with a pressure sensor, which is electrically connected to the controller; the lithium bromide ice unit is also provided with a defoamer, and a temperature sensor is provided on the chilled water outlet pipeline, which is electrically connected to the controller; the lithium bromide ice unit and the ejector are connected through a vacuum outlet pipeline, and the vacuum outlet pipeline is provided with a vacuum shut-off valve, a shut-off valve before the ejector and The ejector regulating valve is electrically connected to the controller, and a vacuum pipeline is also connected to the pipeline between the vacuum shut-off valve and the shut-off valve before the ejector. The vacuum pipeline is provided with a vacuum pump shut-off valve and a vacuum pump, and the vacuum pipeline is connected to the safe position vent pipeline 1; the ejector is connected to the gas source inlet pipeline and the ejector outlet pipeline, and a nitrogen flowmeter and a gas source regulating valve are provided on the gas source inlet pipeline, and the nitrogen flowmeter and the gas source regulating valve are both electrically connected to the controller, the ejector outlet pipeline is provided with an ejector outlet shut-off valve, and the ejector outlet pipeline is connected to the atmospheric pressure nitrogen storage tank and the safe position vent pipeline 2.

[0006] Preferably, a safety valve is provided on the liquid storage tank.

[0007] Preferably, the vacuum outlet pipeline is arranged vertically or obliquely.

[0008] Preferably, the ejector is provided with an air source inlet, a nozzle, a vacuum air chamber, an expansion chamber, a vacuum port and an air source outlet. The ejector is provided with a nozzle at one end close to the air source inlet, and an expansion chamber at one end close to the air source outlet. A vacuum air chamber is formed between the nozzle and the expansion chamber. The air source inlet is connected to the air source air inlet pipeline, the vacuum port is connected to the vacuum outlet pipeline, and the air source outlet is connected to the ejector outlet pipeline.

[0009] Preferably, two vacuum ports are provided, and the vacuum ports are installed vertically to the vacuum outlet pipeline.

[0010] Preferably, the vacuum port and the ejector are connected by an elbow.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This utility model combines the vacuum pump of the lithium bromide ice chiller with the ejector pumping system and related piping. This can address situations where the vacuum pump is damaged due to heavy loads, or where the vacuum level drops significantly during hot and humid summer weather, resulting in poor refrigeration and increased chilled water outlet temperature. By adding an ejector to control the vacuum level of the lithium bromide ice chiller, the refrigeration effect is improved, the cooling capacity of the refrigeration unit is increased, steam usage is reduced, and operating costs are lowered.

[0013] 2. The ejector gas source of this utility model is approximately 0.5 MPa nitrogen. A vacuum shut-off valve, a shut-off valve before the ejector, and an ejector regulating valve are installed on the gas inlet pipeline. The valves control the airflow and thus the vacuum level. The exhaust pipe of the ejector outlet pipeline is led to the outside for safe discharge. The ejector outlet shut-off valve is normally open during operation. When the unit is shut down, the ejector outlet shut-off valve can be closed to allow nitrogen to enter the lithium bromide ice unit for nitrogen protection.

[0014] 3. This utility model uses an arc-shaped connection between the vacuum port and the ejector, which reduces the risk of water accumulation compared to traditional vertical connections. Two vacuum ports are provided, with inlets at both ends, compared to traditional single-end inlets, making the system more stable. If one inlet becomes blocked, the other end can still flow in the medium without affecting the normal operation of the vacuum system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural diagram of a system for improving the vacuum stability of a lithium bromide ice unit.

[0016] Figure 2 It is a structural diagram of the ejector of the utility model.

[0017] In the figure, 1. Lithium bromide ice unit; 101. Chilled water outlet pipe; 102. Chilled water inlet pipe; 103. Pressure sensor; 104. Defoamer; 106. Temperature sensor; 2. Ejector; 201. Air source inlet pipe; 2011. Nitrogen flow meter; 2012. Air source regulating valve; 202. Ejector outlet pipe; 203. Air source inlet; 204. Nozzle; 205. Vacuum chamber; 206. Expansion chamber; 207. Pump Vacuum port; 208, gas source outlet; 2021, ejector outlet shut-off valve; 3, liquid storage tank; 301, safety valve; 4, sampler; 5, vacuum outlet pipeline; 501, vacuum shut-off valve; 502, ejector front shut-off valve; 503, ejector regulating valve; 6, vacuum pipeline; 601, vacuum pump shut-off valve; 602, vacuum pump; 7, safe position vent pipeline 1; 8, atmospheric pressure nitrogen storage tank; 9, safe position vent pipeline 2. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described 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 should fall within the scope of protection of the present invention.

[0019] Example 1

[0020] like Figure 1 and Figure 2 As shown, this embodiment provides a system for improving the vacuum stability of a lithium bromide ice unit, comprising a controller and a lithium bromide ice unit 1, an ejector 2, a liquid storage tank 3, and a sampler 4 connected in sequence through pipelines, wherein the liquid storage tank 3 is provided with a safety valve 301;

[0021] The lithium bromide ice unit 1 is connected to a chilled water outlet pipe 101 and a chilled water inlet pipe 102; the lithium bromide ice unit 1 is provided with a pressure sensor 103, which is electrically connected to a controller. The lithium bromide ice unit 1 is also provided with a demister 104, and a temperature sensor 106 is provided on the chilled water outlet pipe 101, which is electrically connected to the controller.

[0022] The lithium bromide ice unit 1 and the ejector 2 are connected via a vacuum outlet pipe 5. The vacuum outlet pipe 5 is arranged vertically or obliquely and cannot be bent, otherwise water will accumulate in the liquid storage tank 3 and the nitrogen cannot be recycled. The vacuum outlet pipe 5 is provided with a vacuum shut-off valve 501, a shut-off valve 502 before the ejector and an ejector regulating valve 503. The ejector regulating valve 503 is electrically connected to the controller. A vacuum pipe 6 is further connected to the pipe between the vacuum shut-off valve 501 and the shut-off valve 502 before the ejector. A vacuum pump shut-off valve 601 and a vacuum pump 602 are provided on the vacuum pipe 6. The vacuum pipe 6 is connected to a safe position vent pipe 7.

[0023] The ejector 2 is connected to an air source inlet pipeline 201 and an ejector outlet pipeline 202, and the air source inlet pipeline 201 is provided with a nitrogen flow meter 2011 and an air source regulating valve 2012, and the nitrogen flow meter 2011 and the air source regulating valve 2012 are both electrically connected to the controller, and the ejector outlet pipeline 202 is provided with an ejector outlet cut-off valve 2021, and the ejector outlet pipeline 202 is connected to the atmospheric pressure nitrogen storage tank 8 and the safe position vent pipeline 29; the ejector 2 is provided with an air source inlet 203, a nozzle 204, a vacuum chamber 205, an expansion chamber 206, a vacuum port 207 and an air source outlet 208, and the ejector A nozzle 204 is provided at one end of the device 2 near the gas source inlet 203, and an expansion chamber 206 is provided at one end of the ejector 2 near the gas source outlet 208. A vacuum air chamber 205 is formed between the nozzle 204 and the expansion chamber 206. The gas source inlet 203 is connected to the gas source air inlet pipeline 201, the vacuum port 207 is connected to the vacuum outlet pipeline 5, and the gas source outlet 208 is connected to the ejector outlet pipeline 202. There are two vacuum ports 207, which are installed vertically to the vacuum outlet pipeline 5. The vacuum port 207 and the ejector 2 are connected with an elbow. The elbow is a common structure available on the market and will not be described here.

[0024] Since the vacuuming of the lithium bromide ice unit does not necessarily require long-term operation, this embodiment can be divided into four working modes:

[0025] Mode 1: When the lithium bromide ice unit is shut down for a long time and does not need vacuuming and nitrogen protection, the above-mentioned vacuum shut-off valve 501, the shut-off valve 502 before the ejector, the shut-off valve 601 before the vacuum pump, and the ejector regulating valve 503 are closed. In order to save operating costs, the gas source regulating valve 2012 and the ejector outlet shut-off valve 2021 can also be closed (the remaining unmarked ones are manual valves, which can also be closed).

[0026] Mode 2: When the lithium bromide ice unit needs to be vacuumed intermittently and the time is fixed, you can choose to use a vacuum pump or an ejector to vacuum.

[0027] 1) When using a vacuum pump to evacuate the vacuum, it should be done when the vacuum pump is running and stable without any abnormalities. Open the vacuum shut-off valve 501 and enter the vacuum pump shut-off valve 601 to evacuate the vacuum. When stopping the vacuum, close the vacuum shut-off valve 501 first, enter the vacuum pump shut-off valve 601 and then stop the vacuum pump to prevent the backflow of non-condensable steam and incomplete vacuuming, which may cause the vacuum degree to decrease.

[0028] 2) When using the ejector to evacuate the air, first open the ejector outlet shut-off valve 2021 (and the hand valve in the safety position to vent air), the ejector outlet shut-off valve 2021 (this valve is a regulating valve and the opening can be adjusted according to the pressure gauge of the unit; when the unit pressure is high, the valve can be opened wide; when the pressure is low, it can be appropriately closed, and the minimum opening is noted; the opening is determined by the ejector selection and the maximum load to determine the gas source flow) to allow the ejector to establish a vacuum area, then open the ejector inlet shut-off valve 502, the ejector regulating valve 5 03 (Adjust the opening size according to demand. This valve is a regulating valve and the opening can be adjusted according to the level of the unit pressure gauge. When the unit pressure is high, the valve can be opened wider; when the pressure is low, it can be appropriately closed.) Use the vacuum shut-off valve 501 to perform vacuuming. When stopping vacuuming, first close the vacuum shut-off valve 501, the shut-off valve 502 before the ejector, and the ejector regulating valve 503. Then stop the nitrogen gas source to the ejector and stop the operation of the ejector to prevent the backflow of non-condensable steam and incomplete vacuuming, which may cause the vacuum degree to decrease.

[0029] Mode 3: If the lithium bromide ice unit needs to run for a long time, you can choose to use a vacuum pump or an ejector to evacuate the air.

[0030] a) When using a vacuum pump to evacuate the air, the operation method is the same as that in 1) of the above-mentioned mode 2. When the temperature sensor 106 and the pressure sensor 103 are set to alarm abnormally, the vacuum pump shut-off valve 601 is closed in time. If the vacuum pump is abnormal, the ejector can be used to continue evacuating the air. The stable vacuum degree ensures the safe and stable operation of the lithium bromide ice unit.

[0031] b) When using a vacuum pump ejector to create a vacuum, the operation is consistent with the method described in 2) of Mode 2 above. If the temperature sensor 106 and pressure sensor 103 are set to an alarm, the shut-off valve 502 before the ejector is immediately closed. If the ejector is malfunctioning, the vacuum pump can be used to continue creating a vacuum. Maintaining a stable vacuum ensures safe and stable operation of the lithium bromide ice chiller unit. Under these operating conditions, the pressure gauge can be set to automatically adjust according to the lithium bromide ice chiller unit pressure sensor 103, the gas source control valve 2012, and the ejector control valve 503, effectively stabilizing the unit pressure and ensuring stable operation.

[0032] When running for a long time, compared with the previous single vacuum pump vacuuming, if the vacuum pump fails or the load suddenly increases, the vacuum degree will drop too quickly, which will inevitably lead to the lithium bromide unit chain shutdown due to vacuum pressure problems, thereby affecting upstream and downstream devices.

[0033] Mode 4: Valve operation when the lithium bromide vacuum unit switches from normal operation to shutdown state.

[0034] A) From normal operation to shutdown (short-term stop operation), the valve status is the same as mode 1 (vacuum degree needs to be guaranteed);

[0035] B) From normal operation to shutdown (long-term shutdown), nitrogen protection can be provided by returning nitrogen through the ejector. At this time, the ejector outlet shut-off valve 2021, the vacuum pump shut-off valve 601; the gas source regulating valve 2012, the ejector front shut-off valve 502, and the vacuum shut-off valve 501 can be opened to return nitrogen to the unit for nitrogen protection. Compared with the previous operation, which could only break the vacuum to let in air and then let in nitrogen through a temporary pipeline for a long time, the unit downtime is greatly shortened, manual operations are reduced, on-site work intensity is reduced, and in most cases, the contact time between the unit and the air is reduced, thus extending the service life of the unit.

[0036] The purpose of setting up the liquid storage tank 3 is to prevent the N2 from carrying water or the lithium bromide ice unit from malfunctioning when vacuuming. The internal materials of the lithium bromide ice unit are extracted to cause environmental pollution and abnormal problems downstream. If there is a liquid level in the liquid storage tank, it should be judged whether it is caused by N2 carrying water or an operating problem of the vacuum unit. The water quality of the sampler 4 is tested. If it is all water and does not contain the materials of the lithium bromide ice unit, the water in the liquid storage tank 3 can be recycled to the lithium bromide ice unit 1 for use; if the water quality test shows that a small part of the internal materials of the lithium bromide ice unit are mostly water, the lithium bromide ice unit should be tested. When the sampling and analysis of the lithium unit does not affect the operation of the vacuum unit, it can be determined according to the situation whether to add lithium bromide internal additives. At this time, the materials in the liquid storage tank 3 will be handled according to the situation. If there is recovery value, it will be recycled and used. If there is no recovery value, it should be treated as hazardous waste; if the water quality detection shows that most of the internal materials of the vacuum unit are a small part of water, the materials in the storage tank will be handled according to the situation. If there is recovery value, it will be recycled and used. If there is no recovery value, it should be treated as hazardous waste; if the water quality detection shows that all the materials are internal to the unit, it will be determined according to the manufacturer's guidance whether to recycle them to the unit for use. If not, they should be treated as hazardous waste.

[0037] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A system for improving the vacuum stability of a lithium bromide ice unit, characterized in that: It includes a controller and a lithium bromide ice unit (1), an ejector (2), a liquid storage tank (3) and a sampler (4) which are sequentially connected through pipelines; The lithium bromide ice unit (1) is connected to a chilled water outlet pipe (101) and a chilled water inlet pipe (102); the lithium bromide ice unit (1) is provided with a pressure sensor (103), the pressure sensor (103) and the controller are electrically connected; the lithium bromide ice unit (1) is also provided with a defoamer (104); a temperature sensor (106) is provided on the chilled water outlet pipe (101), and the temperature sensor (106) and the controller are electrically connected; The lithium bromide ice unit (1) and the ejector (2) are connected via a vacuum outlet pipeline (5), the vacuum outlet pipeline (5) is provided with a vacuum shut-off valve (501), a shut-off valve before the ejector (502), and an ejector regulating valve (503), the ejector regulating valve (503) is electrically connected to the controller, a vacuum pipeline (6) is further connected to the pipeline between the vacuum shut-off valve (501) and the shut-off valve before the ejector (502), the vacuum pipeline (6) is provided with a vacuum pump shut-off valve (601) and a vacuum pump (602), and the vacuum pipeline (6) is connected to a safety position vent pipeline (7); The ejector (2) is connected to an air source inlet pipeline (201) and an ejector outlet pipeline (202); a nitrogen flow meter (2011) and an air source regulating valve (2012) are provided on the air source inlet pipeline (201); the nitrogen flow meter (2011) and the air source regulating valve (2012) are both electrically connected to the controller; an ejector outlet pipeline (202) is provided with an ejector outlet shut-off valve (221); the ejector outlet pipeline (202) is connected to a normal pressure nitrogen storage tank (8) and a second safety position vent pipeline (9).

2. The system for improving the vacuum stability of a lithium bromide ice unit according to claim 1, wherein: The liquid storage tank (3) is provided with a safety valve (301).

3. The system for improving the vacuum stability of a lithium bromide ice unit according to claim 1, wherein: The vacuum outlet pipeline (5) is arranged vertically or obliquely.

4. The system for improving the vacuum stability of a lithium bromide ice unit according to claim 3, wherein: The ejector (2) is provided with an air source inlet (203), a nozzle (204), a vacuum chamber (205), an expansion chamber (206), a vacuum port (207) and an air source outlet (208). The ejector (2) is provided with a nozzle (204) at one end close to the air source inlet (203), and an expansion chamber (206) at one end close to the air source outlet (208). A vacuum chamber (205) is formed between the nozzle (204) and the expansion chamber (206). The air source inlet (203) is connected to the air source air inlet pipeline (201), the vacuum port (207) is connected to the vacuum outlet pipeline (5), and the air source outlet (208) is connected to the ejector outlet pipeline (202).

5. The system for improving the vacuum stability of a lithium bromide ice unit according to claim 4, characterized in that: Two vacuum ports (207) are provided, and the vacuum ports (207) are installed vertically to the vacuum outlet pipeline (5).

6. The system for improving the vacuum stability of a lithium bromide ice unit according to claim 5, characterized in that: The vacuum port (207) is connected to the ejector (2) by an elbow.

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