Cold and heat combined supply system utilizing waste heat of compressed air
By designing a combined cooling and heating system, utilizing a gas-water heat exchanger and a hot water-type lithium bromide unit, the comprehensive utilization of compressed air waste heat was achieved, solving the problem of insufficient utilization of compressed air waste heat in aluminum and magnesium smelting, and realizing the effects of combined cooling and heating, energy saving, and pollution reduction.
Patent Information
- Application Number
- CN202520150737.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-01-22
AI Technical Summary
In aluminum and magnesium smelting production, the waste heat of compressed air is not effectively utilized, resulting in heat loss. Furthermore, existing technologies cannot achieve combined cooling and heating, thus failing to meet production demands.
Design a combined cooling and heating system that utilizes waste heat from compressed air for heat exchange via a gas-water heat exchanger and a hot water type lithium bromide unit to generate both cold and hot heat sources for production and domestic use. Continuous water recovery and supply are achieved through a circulating water pump and a circulating water tank. The system is optimized by combining a variable frequency pump and a bypass valve.
It achieves a reduction in compressed air temperature and an increase in circulating water temperature, meeting production needs while reducing heat loss, realizing combined cooling and heating, reducing carbon dioxide emissions, and achieving energy saving and pollution reduction effects.
Smart Images
Figure CN223954416U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to compressed air waste heat utilization field, concretely relates to a kind of cold and heat combined supply system using compressed air waste heat. BACKGROUND
[0002] In the production process of aluminum-magnesium smelting, a large amount of dry and purified compressed air at normal temperature is usually required, and the exhaust temperature of centrifugal air compressor is about 120 DEG C, so the high-temperature compressed air needs to be cooled and dried and purified. According to the different requirements of process production on the quality of compressed air, the types of dryers in the centrifugal air compressor system are usually as follows: waste heat regeneration compressed air dryer, frozen compressed air dryer and combined compressed air dryer.
[0003] Among them, the waste heat regeneration dryer can effectively utilize the compressed air waste heat while drying and purifying the compressed air. For the centrifugal compressor system with a frozen dryer, the high-temperature compressed air needs to be cooled to below 45 DEG C by water cooling, and then the low-temperature compressed air can enter the dryer for drying and purification. The heat energy exchanged is directly discharged to the atmosphere through the circulating cooling system, resulting in a large loss of heat energy. SUMMARY
[0004] To solve the above problems, the utility model provides a kind of cold and heat combined supply system using compressed air waste heat, which comprehensively recycles and utilizes the compressed air waste heat, generates cold and heat sources for production and life at the same time, reduces carbon dioxide emissions, has the dual significance of energy saving and efficiency improvement, pollution reduction and carbon reduction.
[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of cold and heat combined supply system using compressed air waste heat, comprising a centrifugal air compressor, the exhaust port of the centrifugal air compressor is connected with the gas-water heat exchanger inlet, the gas-water heat exchanger outlet is connected with the compressed air after-cooler inlet, the compressed air after-cooler outlet is connected with the frozen dryer inlet;The water outlet of the gas-water heat exchanger is connected with the hot water type lithium bromide unit and the heat user respectively, the cold source discharge port of the hot water type lithium bromide unit is connected with the cold user, the water outlet of the heat user and the cold user is connected with the circulating water tank, the circulating water tank is connected with the inlet of the circulating water pump, and the outlet of the circulating water pump is connected with the water inlet of the gas-water heat exchanger.
[0006] The gas-water heat exchanger adopts staggered multi-tube serpentine pipe, and the shell side is a compressed air passage, and the tube side is a circulating water pipeline.
[0007] The heat exchange tube of the gas-water heat exchanger adopts integral spiral finned tube.
[0008] Electric regulating valves are installed between the drain outlet of the gas-water heat exchanger and the hot water type lithium bromide unit, and between the drain outlet of the gas-water heat exchanger and the heat user.
[0009] A bypass pipeline is provided between the centrifugal air compressor and the compressed air aftercooler, and a bypass valve is provided on the bypass pipeline.
[0010] The circulating water pump is a variable frequency pump.
[0011] The beneficial effects of this invention are as follows: A gas-water heat exchanger is used to exchange heat between high-temperature compressed air and low-temperature circulating water, causing the temperature of the high-temperature compressed air to drop. The compressed air then enters a compressed air aftercooler and a refrigerated dryer to obtain compressed air at room temperature, meeting the requirements of aluminum and magnesium smelting processes. Simultaneously, the low-temperature circulating water temperature rises and is supplied to heat users and hot-water lithium bromide units. The hot-water lithium bromide units use the high-temperature circulating water as a heat source to produce low-temperature chilled water, which is then supplied to cold users, thus achieving combined cooling and heating for production and daily life. Through continuous water recovery and supply via a circulating water tank and pump, a continuous cooling and heating system is achieved. Attached Figure Description
[0012] The present invention will be further described below with reference to the accompanying drawings:
[0013] Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] 1. Centrifugal air compressor; 2. Air-water heat exchanger; 3. Compressed air aftercooler; 4. Refrigerated dryer; 5. Hot water type lithium bromide unit; 6. Heat user; 7. Cold user; 8. Circulating water tank; 9. Circulating water pump; 10. Electric regulating valve; 11. Bypass pipeline; 12. Bypass valve. Detailed Implementation
[0015] 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.
[0016] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments. Example
[0017] like Figure 1The utility model provides a kind of cold and heat combined supply system using compressed air waste heat, including centrifugal air compressor 1, the exhaust of centrifugal air compressor 1 is connected with the air-water heat exchanger 2 air inlet, the air outlet of air-water heat exchanger 2 is connected with the compressed air rear cooler 3 air inlet, the air outlet of compressed air rear cooler 3 is connected with the refrigeration dryer 4 air inlet;The drain of air-water heat exchanger 2 is connected with hot water type lithium bromide unit 5 and hot user 6 respectively, the cold source exhaust of hot water type lithium bromide unit 5 is connected with cold user 7, the drain of hot user 6 and cold user 7 is connected with circulating water tank 8, circulating water tank 8 is also connected with the inlet of circulating water pump 9, the outlet of circulating water pump 9 is connected with the water inlet of air-water heat exchanger 2.
[0018] Specifically, the air-water heat exchanger 2 adopts staggered multi-tube serpentine pipe, the shell side is compressed air channel, and the tube side is circulating water pipeline; the compressed air temperature at the inlet of the shell side is about 120℃, the compressed air temperature at the outlet is about 60℃, the low-temperature circulating water temperature at the inlet of the tube side is about 50℃, and the high-temperature circulating water temperature at the outlet is about 70℃, and the heat exchange tube of the air-water heat exchanger 2 adopts integral spiral finned tube.
[0019] Specifically, the drain of the air-water heat exchanger 2 and the hot water type lithium bromide unit 5 and the drain of the air-water heat exchanger 2 and the hot user 6 are both provided with electric regulating valve 10; when the user needs to adjust the heat supply and cooling capacity, the opening degree of the electric regulating valve 10 can be adjusted to achieve.
[0020] Specifically, the centrifugal air compressor 1 and the compressed air rear cooler 3 are provided with bypass pipeline 11, and the bypass pipeline 11 is provided with bypass valve 12; the high-temperature compressed air discharged by the centrifugal air compressor 1 can directly enter the compressed air rear cooler 3 through the bypass pipeline 11, and the high-temperature compressed air is reduced to low temperature for production use.
[0021] Specifically, the circulating water pump 9 is a variable frequency regulating pump, and in order to prevent the circulating water pipeline from scaling, the circulating water is desalted water.
[0022] Working principle: centrifugal air compressor 1 discharges high temperature compressed air into gas-water heat exchanger 2 shell, and carries out heat exchange with low temperature circulating water of tube side, high temperature compressed air temperature drops, enters compressed air after-cooler 3, temperature continues to drop, enters refrigeration dryer 4, and finally dry and purified compressed air is sent to process production; the low temperature circulating water of tube side is raised to high temperature circulating water, is discharged from the water outlet of gas-water heat exchanger 2, and is sent to hot water type lithium bromide unit 5 and hot user 6 respectively, hot user 6 directly utilizes high temperature circulating water heat to produce and live, hot water type lithium bromide unit 5 utilizes high temperature circulating water as heat source to prepare low temperature cold water, and sends to cold user 7 for use; the low temperature circulating water discharged from hot user 6 and hot water type lithium bromide 5 is sent to circulating water tank 8, circulating water in circulating water tank 8 is sent to the water inlet of gas-water heat exchanger 2 through circulating water pump 9, low temperature circulating water is heat exchanged with high temperature compressed air in gas-water heat exchanger 2, and is converted into high temperature circulating water, high temperature compressed air becomes low temperature compressed air, and the whole cycle is completed. Such continuous circulation realizes cold and heat combined supply.
[0023] In addition to the preferred embodiments described above, the utility model also has other implementation manners, and all other embodiments obtained by those skilled in the art based on the embodiments in the utility model without making creative labor belong to the range of the utility model claimed.
Claims
1. A combined cooling and heating system utilizing compressed air waste heat, characterized by, The centrifugal air compressor (1) is connected with the air inlet of the air-water heat exchanger (2), the air outlet of the air-water heat exchanger (2) is connected with the air inlet of the compressed air after-cooler (3), and the air outlet of the compressed air after-cooler (3) is connected with the air inlet of the refrigeration dryer (4); the water outlet of the air-water heat exchanger (2) is connected with the hot water type lithium bromide unit (5) and the hot user (6) respectively, the cold source outlet of the hot water type lithium bromide unit (5) is connected with the cold user (7), the water outlets of the hot user (6) and the cold user (7) are connected with the circulating water tank (8), the circulating water tank (8) is connected with the inlet of the circulating water pump (9), and the outlet of the circulating water pump (9) is connected with the water inlet of the air-water heat exchanger (2).
2. The combined cooling and heating system using compressed air waste heat according to claim 1, wherein, The air-water heat exchanger (2) adopts staggered multi-tube serpentine pipe, the shell pass is a compressed air channel, and the tube pass is a circulating water pipeline.
3. The combined cooling and heating system using compressed air waste heat according to claim 1, wherein, The heat exchange pipe of the air-water heat exchanger (2) adopts an integral spiral fin pipe.
4. The combined cooling and heating system using compressed air waste heat according to claim 1, wherein, Electric regulating valves (10) are arranged between the water outlets of the air-water heat exchanger (2) and the hot water type lithium bromide unit (5) and between the water outlets of the air-water heat exchanger (2) and the hot user (6).
5. The combined cooling and heating system using compressed air waste heat according to claim 1, wherein, A bypass pipeline (11) is arranged between the centrifugal air compressor (1) and the compressed air after-cooler (3), and a bypass valve (12) is arranged on the bypass pipeline (11).
6. The combined cooling and heating system using compressed air waste heat according to claim 1, wherein, The circulating water pump (9) is a variable frequency regulating pump.