Energy-saving cold water system with air cooler replacing lithium bromide unit
By cooling the air cooler and controlling the operation of the lithium bromide unit, the problem of high operation difficulty and high energy consumption of the 7℃ cold water system in extreme environments is solved, and the effect of energy saving and consumption reduction is achieved.
Patent Information
- Application Number
- CN202420023902.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-04
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-01-04
AI Technical Summary
The existing 7℃ cold water system is difficult to operate in extreme environments and requires frequent operation, which can easily cause air-cooled tube freezing, and the frequent operation of the lithium bromide unit leads to high steam and electricity consumption.
Use an air cooler to replace the lithium bromide unit, and refrigerated water is refluxed through the air cooler through the 7℃ return water pipeline and the refrigerated water circulation pump to cool down, control the operation or shutdown of the lithium bromide unit, and use valves and bypass pipelines to adjust the circulation volume of the cold water system according to the ambient temperature Adjust unit load.
It realizes the purpose of reducing the operating frequency and energy consumption of lithium bromide units in extreme environments, and saves steam and electricity consumption through return water temperature control, achieving the purpose of energy saving and consumption reduction.
Smart Images
Figure CN222317401U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cold water systems, and particularly relates to an energy-saving cold water system in which an air cooler replaces a lithium bromide unit. Background Art
[0002] At present, the 7℃ cold water system mainly uses lithium bromide units for refrigeration. The lithium bromide refrigeration unit has a simple structure, small size, small footprint, easy manufacturing and control, low maintenance costs, and is very safe to operate.
[0003] The cooling capacity of the existing 7℃ cold water system mainly comes from the lithium bromide refrigeration unit. The return water temperature of this cold water system is 12℃ and the supply water temperature is 7℃. According to meteorological data, the lowest daily temperature in the past years is -37.4℃, the average temperature of the coldest month is -14.7℃, the earliest freezing period is November 15, and the latest thawing period is April 27. According to the local meteorological environment, the number of air coolers can be used from December to March of the following year to provide all or part of the required cooling capacity for the 7℃ cold water system, which can reduce the number of lithium bromide units in operation and the unit load or stop the operation of lithium bromide units, thereby saving steam consumption and electricity consumption.
[0004] Due to the low supply and return water temperature of the 7℃ cold water system and the large temperature difference between day and night, operation is difficult when the ambient temperature changes suddenly and requires frequent operation. Improper operation may cause freezing of the air-cooling tube bundle. Utility Model Content
[0005] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide an energy-saving cold water system in which an air cooler replaces a lithium bromide unit.
[0006] The technical solution adopted by the utility model is:
[0007] An energy-saving cold water system in which an air cooler replaces a lithium bromide unit comprises a 7°C return water pipeline, the end of the 7°C return water pipeline is connected to a chilled water circulation pump, the outlet of the chilled water circulation pump is connected to a 7°C water supply pipeline, the other end of the 7°C water supply pipeline is connected to a lithium bromide unit, and the lithium bromide unit is also connected to a 7°C water supply pipeline; the air cooler is also included, a water inlet branch is connected between the water inlet of the air cooler and the 7°C return water pipeline, a water outlet branch is connected between the water outlet of the air cooler and the 7°C return water pipeline, a first valve is connected to a section of the 7°C return water pipeline connecting the water inlet branch and the water outlet branch, a second valve is connected to the water inlet branch, and a third valve is connected to the water outlet branch; a bypass pipeline is connected between the 7°C water supply pipeline and the 7°C water supply pipeline, and a fourth valve is connected to the bypass pipeline.
[0008] When the ambient temperature is ≤5℃, close the first valve, open the second valve and the third valve, and allow the 7℃ cold water return water to enter the air cooler for cooling, and then enter the lithium bromide refrigeration unit for cooling after being pressurized by the chilled water circulation pump. When the return water temperature after cooling by the air cooler is ≤8℃, open the fourth valve, stop the lithium bromide unit and close the lithium bromide inlet and outlet valves. When the return water temperature after cooling by the air cooler is greater than 8℃, adjust the circulation volume of the cold water system through the fourth valve, start the lithium bromide unit for cooling and cooling, and adjust the unit load and the number of units in operation according to the water supply temperature.
[0009] The utility model cools the 7°C circulating water return water through an air cooler before merging it into the 7°C water circulating pump inlet without passing through a lithium bromide unit. The lithium bromide unit is partially operated or completely stopped by controlling the return water temperature, thereby achieving the purpose of energy saving and consumption reduction.
[0010] As a preferred solution of the utility model, the water inlet of the air cooler is also connected to a circulating water inlet pipe, and the water outlet of the air cooler is also connected to a circulating water outlet pipe.
[0011] As a preferred solution of the utility model, the circulating water inlet pipe is connected with a fifth valve, and the circulating water outlet pipe is connected with a sixth valve. When the ambient temperature is ≤5°C, the first valve is closed, the second valve and the third valve are opened, the fifth valve and the sixth valve are closed, and the circulating water of the air cooler no longer passes through the circulating water inlet pipe and the circulating water outlet pipe.
[0012] As a preferred solution of the utility model, a seventh valve is connected to a section between the bypass pipeline and the lithium bromide unit on the 7°C water supply pipeline.
[0013] As a preferred solution of the utility model, an eighth valve is connected to a section between the bypass pipeline and the lithium bromide unit on the 7°C water supply pipeline.
[0014] As a preferred solution of the utility model, the lithium bromide unit is respectively connected with a cooling water supply pipe and a cooling water return pipe.
[0015] As a preferred solution of the utility model, a ninth valve is connected to the cooling water supply pipe, and a tenth valve is connected to the cooling water return pipe.
[0016] As a preferred embodiment of the present invention, a flow meter is connected to a section between the bypass line on the 7°C water delivery pipeline and the lithium bromide unit; a flow meter is connected to a section between the bypass line on the 7°C water supply pipeline and the lithium bromide unit.
[0017] As a preferred solution of the utility model, valves are connected to a section between the water outlet branch and the chilled water circulation pump on the 7°C return water pipeline and a section between the chilled water circulation pump and the bypass pipeline on the 7°C water supply pipeline.
[0018] As a preferred solution of the utility model, flow meters are connected to a section between the water outlet branch and the chilled water circulation pump on the 7°C return water pipeline and a section between the chilled water circulation pump and the bypass pipeline on the 7°C water supply pipeline.
[0019] The beneficial effects of the utility model are:
[0020] The utility model cools the 7°C circulating water return water through an air cooler before merging it into the 7°C water circulating pump inlet without passing through a lithium bromide unit. The lithium bromide unit is partially operated or completely stopped by controlling the return water temperature, thereby achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of the utility model.
[0022] In the figure: 1-7℃ return water pipeline; 2-chilled water circulation pump; 3-7℃ water supply pipeline; 4-lithium bromide unit; 5-7℃ water supply pipeline; 6-air cooler; 7-water inlet branch pipe; 8-water outlet branch pipe; 9-bypass pipeline; 11-first valve; 31-seventh valve; 41-cooling water supply pipe; 42-cooling water return pipe; 43-ninth valve; 44-tenth valve; 51-eighth valve; 61-circulating water inlet pipe; 62-circulating water outlet pipe; 63-fifth valve; 64-sixth valve; 71-second valve; 81-third valve; 91-fourth valve. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0024] 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 represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0025] like Figure 1As shown, the energy-saving chilled water system in which the air cooler of this embodiment replaces the lithium bromide unit includes a 7°C return water pipeline 1, the end of the 7°C return water pipeline 1 is connected to a chilled water circulation pump 2, the outlet of the chilled water circulation pump 2 is connected to a 7°C water supply pipeline 3, the other end of the 7°C water supply pipeline 3 is connected to a lithium bromide unit 4, and the lithium bromide unit 4 is also connected to a 7°C water supply pipeline 5; it also includes an air cooler 6, an inlet branch pipe 7 is connected between the water inlet of the air cooler 6 and the 7°C return water pipeline 1, a water outlet branch pipe 8 is connected between the water outlet of the air cooler 6 and the 7°C return water pipeline 1, a first valve 11 is connected to a section of the 7°C return water pipeline 1 between the inlet branch pipe 7 and the outlet branch pipe 8, a second valve 71 is connected to the inlet branch pipe 7, and a third valve 81 is connected to the outlet branch pipe 8; a bypass pipeline 9 is connected between the 7°C water supply pipeline 3 and the 7°C water supply pipeline 5, and a fourth valve 91 is connected to the bypass pipeline 9.
[0026] The water inlet of the air cooler 6 is also connected to a circulating water inlet pipe 61, and the water outlet of the air cooler 6 is also connected to a circulating water outlet pipe 62. The circulating water inlet pipe 61 is connected to a fifth valve 63, and the circulating water outlet pipe 62 is connected to a sixth valve 64.
[0027] When the ambient temperature is ≤5°C, close the first valve 11, open the second valve 71 and the third valve 81, close the fifth valve 63 and the sixth valve 64, and the circulating water of the air cooler 6 no longer passes through the circulating water inlet pipe 61 and the circulating water outlet pipe 62, and the 7°C cold water return water enters the air cooler 6 for cooling, and then enters the lithium bromide refrigeration unit for cooling after being pressurized by the chilled water circulation pump 2. When the return water temperature after cooling through the air cooler 6 is ≤8°C, open the fourth valve 91, stop the lithium bromide unit 4 and close the lithium bromide inlet and outlet valves. When the return water temperature after cooling through the air cooler 6 is greater than 8°C, adjust the circulation volume of the cold water system through the fourth valve 91, start the lithium bromide unit 4 for cooling, and adjust the unit load and the number of units in operation according to the water supply temperature.
[0028] The utility model cools the 7°C circulating water return water through the air cooler 6 before merging it into the 7°C water circulating pump inlet without passing through the lithium bromide unit 4. The lithium bromide unit 4 is partially operated or completely stopped by the return water temperature, thereby achieving the purpose of energy saving and consumption reduction.
[0029] A seventh valve 31 is connected to a section between the bypass pipeline 9 and the lithium bromide unit 4 on the 7° C. water supply pipeline 3 .
[0030] An eighth valve 51 is connected to a section of the 7° C. water supply pipeline 5 between the bypass pipeline 9 and the lithium bromide unit 4 .
[0031] The lithium bromide unit 4 is respectively connected with a cooling water supply pipe 41 and a cooling water return pipe 42. The cooling water supply pipe 41 is connected with a ninth valve 43, and the cooling water return pipe 42 is connected with a tenth valve 44.
[0032] A flow meter is connected to a section between the bypass pipeline 9 and the lithium bromide unit 4 on the 7°C water delivery pipeline 3; a flow meter is connected to a section between the bypass pipeline 9 and the lithium bromide unit 4 on the 7°C water supply pipeline 5.
[0033] Valves are connected to a section between the outlet branch pipe 8 and the chilled water circulation pump 2 on the 7°C return water pipeline 1 and a section between the chilled water circulation pump 2 and the bypass pipeline 9 on the 7°C water supply pipeline 3.
[0034] Flow meters are connected to a section between the outlet branch pipe 8 and the chilled water circulation pump 2 on the 7°C return water pipeline 1 and a section between the chilled water circulation pump 2 and the bypass pipeline 9 on the 7°C water supply pipeline 3.
[0035] Calculation of annual income:
[0036] Calculated based on 120 days of winter operation (i.e. 2,880 hours) per year.
[0037] 7℃ circulating water: flow rate 6000m 3 / h, feed water temperature 7.6℃, return water temperature 9.8℃.
[0038] Energy consumption of lithium bromide at a temperature difference of 2.2°C:
[0039] Steam consumption: 28t / h;
[0040] Power consumption: 1388kW / h;
[0041] Steam consumption: 28t / h*2880h*60 yuan / t=4838400 yuan=4838400 yuan;
[0042] Electricity consumption: 1388kw / h*2880h*0.24 yuan / kw=959385.6 yuan=959,000 yuan;
[0043] Annual cost savings: 4.8384 million + 959,000 = 5.7974 million.
[0044] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.
Claims
1. An energy-saving chilled water system in which an air cooler replaces a lithium bromide unit, characterized in that: The invention comprises a 7°C water return pipeline (1), wherein the end of the 7°C water return pipeline (1) is connected to a chilled water circulation pump (2), the outlet of the chilled water circulation pump (2) is connected to a 7°C water supply pipeline (3), the other end of the 7°C water supply pipeline (3) is connected to a lithium bromide unit (4), and the lithium bromide unit (4) is also connected to a 7°C water supply pipeline (5); and also comprises an air cooler (6), wherein a water inlet branch pipe (7) is connected between the water inlet of the air cooler (6) and the 7°C water return pipeline (1), and a water outlet of the air cooler (6) is connected to the water outlet of the air cooler (6). A water outlet branch pipe (8) is connected to the 7°C water return pipe (1); a first valve (11) is connected to a section of the 7°C water return pipe (1) between the water inlet branch pipe (7) and the water outlet branch pipe (8); a second valve (71) is connected to the water inlet branch pipe (7); and a third valve (81) is connected to the water outlet branch pipe (8); a bypass pipe (9) is connected between the 7°C water delivery pipe (3) and the 7°C water supply pipe (5); and a fourth valve (91) is connected to the bypass pipe (9).
2. The energy-saving cold water system of claim 1 in which an air cooler replaces a lithium bromide unit, characterized in that: The water inlet of the air cooler (6) is also connected to a circulating water inlet pipe (61), and the water outlet of the air cooler (6) is also connected to a circulating water outlet pipe (62).
3. The energy-saving cold water system according to claim 2, wherein the air cooler replaces the lithium bromide unit, characterized in that: The circulating water inlet pipe (61) is connected to a fifth valve (63), and the circulating water outlet pipe (62) is connected to a sixth valve (64).
4. The energy-saving chilled water system according to claim 1, wherein the air cooler replaces the lithium bromide unit, characterized in that: A seventh valve (31) is connected to a section between the bypass pipeline (9) and the lithium bromide unit (4) on the 7°C water supply pipeline (3).
5. The energy-saving chilled water system according to claim 1, wherein the air cooler replaces the lithium bromide unit, characterized in that: An eighth valve (51) is connected to a section of the 7°C water supply pipeline (5) between the bypass pipeline (9) and the lithium bromide unit (4).
6. The energy-saving chilled water system according to claim 1, wherein the air cooler replaces the lithium bromide unit, characterized in that: The lithium bromide unit (4) is respectively connected to a cooling water supply pipe (41) and a cooling water return pipe (42).
7. The energy-saving chilled water system according to claim 6, wherein the air cooler replaces the lithium bromide unit, characterized in that: The cooling water supply pipe (41) is connected to a ninth valve (43), and the cooling water return pipe (42) is connected to a tenth valve (44).
8. The energy-saving chilled water system according to claim 1, wherein an air cooler replaces a lithium bromide unit, characterized in that: A flow meter is connected to a section between the bypass pipeline (9) and the lithium bromide unit (4) on the 7°C water delivery pipeline (3); and a flow meter is connected to a section between the bypass pipeline (9) and the lithium bromide unit (4) on the 7°C water supply pipeline (5).
9. The energy-saving chilled water system according to claim 1, wherein an air cooler replaces a lithium bromide unit, characterized in that: Valves are connected to a section between the outlet branch pipe (8) and the chilled water circulation pump (2) on the 7°C return water pipeline (1) and a section between the chilled water circulation pump (2) and the bypass pipeline (9) on the 7°C water supply pipeline (3).
10. The energy-saving chilled water system according to claim 1, wherein the air cooler replaces the lithium bromide unit, characterized in that: A flow meter is connected to a section between the outlet branch pipe (8) and the chilled water circulation pump (2) on the 7°C return water pipeline (1) and a section between the chilled water circulation pump (2) and the bypass pipeline (9) on the 7°C water supply pipeline (3).