A dry oil-free screw air compressor heat recovery management system

Abstract

The application discloses a dry type oil-free screw air compressor heat recovery management system, which comprises a heat exchanger a, a heat exchanger b, a heat exchanger c and a heat exchanger d, an inlet a is formed in the left upper side of the heat exchanger a, an outlet a is formed in the right upper side of the heat exchanger a, an outlet b is formed in the left lower side of the heat exchanger a, an inlet c and an inlet d are respectively formed in the left and right upper sides of the heat exchanger b, an outlet c and an outlet d are respectively formed in the left and right lower sides of the heat exchanger b, an outlet e, an outlet f, an inlet e and an inlet f are formed in the upper and lower left and right sides of the heat exchanger c, the outlet e, the outlet f, the inlet e and the inlet f correspond to the outlet c, the outlet d, the inlet c and the inlet d one by one, an outlet g, an outlet h, an inlet g and an inlet h are formed in the upper and lower left and right sides of the heat exchanger d, and the dry type oil-free screw air compressor heat recovery management system has the advantages of high proportion of electric energy recycling and reuse, energy saving and consumption reduction, stable operation, prevention of scale formation of the heat exchanger and saving of operation cost.

Description

Technical Field

[0001] This invention relates to the field of heat recovery technology, specifically to a heat recovery management system for a dry oil-free screw air compressor. Background Technology

[0002] Air compressor waste heat recovery refers to a new type of high-efficiency waste heat utilization equipment that uses the absorption of waste heat from air compressors to heat cold water without consuming energy. As a new type of high-efficiency waste heat utilization equipment, it is mainly used to solve the problems of hot water for employees' domestic and industrial use. Since the company already uses screw air compressors, this only adds the function of screw air compressors, saving the company energy consumption and thus saving a lot of costs.

[0003] Existing dry oil-free screw air compressors typically utilize the final stage (second stage) heat recovery technology, with a recovery rate of around 30%. The proportion of electrical energy recovery and reuse of input shaft power is relatively low. Moreover, during the recovery process, dry oil-free screw air compressors are prone to fluctuations, making it impossible to achieve a balance between safety and efficiency. Furthermore, the long-term thermal circulation of tap water as a cooling medium in dry oil-free screw air compressors leads to scaling on the heat exchanger, reducing service life and increasing operating costs. Summary of the Invention

[0004] The purpose of this invention is to provide a heat recovery management system for dry oil-free screw air compressors, which has the advantages of high energy recovery and reuse ratio, energy saving and consumption reduction, stable operation, avoidance of scale formation in heat exchangers, and saving operating costs, thus solving the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dry oil-free screw air compressor heat recovery management system, comprising heat exchanger a, heat exchanger b, heat exchanger c, and heat exchanger d. Heat exchanger a has an inlet a on its upper left side and an outlet a on its upper right side. Heat exchanger a has an outlet b on its lower left side. Heat exchanger b has inlets d and c on its upper left and right sides, respectively. Heat exchanger b has outlets d and c on its lower left and right sides, respectively. Heat exchanger c has outlets f and e on its lower left and right sides, respectively. Heat exchanger c has inlets f and e on its upper left and right sides, respectively. Outlets e, f, e, and f correspond one-to-one with outlets c, d, c, and d. Heat exchanger d has outlets h and g on its lower left and right sides, respectively. Heat exchanger d has inlets h and g on its upper left and right sides, respectively. Outlets g, h, g, and h correspond one-to-one with outlets c, d, c, and d.

[0006] The heat exchanger a has an inlet b on its lower right side. Inlet a is connected to a three-way PID proportional-integral valve via a pipe. The three-way PID proportional-integral valve is connected to a circulating pump via a pipe. A temperature sensor d is connected between the circulating pump and the three-way PID proportional-integral valve. An outlet a is connected between the three-way PID proportional-integral valve and the temperature sensor d. The circulating pump is connected in parallel to a primary cooler, a secondary cooler, and an oil cooler via pipes. The oil cooler is connected in series with a PID proportional-integral valve c and a temperature sensor h via pipes. The temperature sensor h is connected to inlet d via a pipe, and outlet d is connected to a water collector a via a pipe. The water collector a is connected to the three-way PID proportional-integral valve via a pipe. For example, in an integral valve, the inlet c is connected to a cold-side water inlet via a pipe, and a temperature sensor e is connected between the cold-side water inlet and inlet c. The outlet c is connected to a water collector b via a pipe, and a temperature sensor j is connected to the water collector b. The water collector b is connected to inlet e and inlet g via pipes. The inlet f is connected to a secondary cooler via a pipe. The inlet h is connected to a primary cooler via a pipe. Both outlet h and outlet f are connected to a water collector d via pipes. The water collector d is connected to inlet d via a pipe. Both outlet g and outlet e are connected to a water collector c via pipes. The water collector c is connected to a cold-side water outlet via a pipe, and a temperature sensor a is connected between the cold-side water outlet and water collector c.

[0007] Preferably, the inlet b is connected to a water inlet via a pipe, and a temperature sensor c is connected between the water inlet and the inlet b; the outlet b is connected to a water outlet via a pipe, and a temperature sensor b is connected between the outlet b and the water outlet.

[0008] Preferably, the right end of the water collector a is connected in series with a PID proportional integral valve a and a water inlet via a pipe.

[0009] Preferably, a PID proportional-integral valve b and a temperature sensor f are connected in series between the primary cooler and the inlet h, and a PID proportional-integral valve d and a temperature sensor g are connected in series between the secondary cooler and the inlet f.

[0010] Preferably, the inlet e and inlet g are respectively connected to the water collector b via PID proportional integral valve f and PID proportional integral valve g, and the outlet g and outlet e are respectively connected to the water collector c via temperature sensor k and temperature sensor i.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. This dry-type oil-free screw air compressor heat recovery management system regulates the temperature of water collector a through heat exchanger a, facilitating water temperature adjustment in water collector a. It also regulates the drainage pipe through a three-way PID proportional-integral valve, allowing for adjustment based on the opening and closing of the drainage pipe. A circulating pump provides power to ensure water flow. Temperature sensors b and c detect the inlet and outlet temperatures for convenient water temperature monitoring. Temperature sensor d detects the water temperature at the circulating pump, facilitating water temperature monitoring. Water is replenished through a water inlet, controlled by the PID proportional-integral valve a for controlled water replenishment. Heat exchanger b facilitates heat absorption by the lubricating oil, and an oil cooler cools the engine oil.

[0013] 2. This dry-type oil-free screw air compressor heat recovery management system uses a primary cooler and a secondary cooler for cooling, which is convenient. The output of the primary and secondary coolers is controlled by PID proportional integral valves b and d, which is convenient for control. Temperature data is detected by temperature sensors f and g, which is convenient for temperature control. Heat exchange is carried out through heat exchangers c and d, which is convenient for heat energy recovery. Water is collected by water collectors c and d, which is convenient for water storage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system structure of a dry oil-free screw air compressor heat recovery management system according to the present invention;

[0015] Figure 2 This is a schematic diagram of heat exchanger a in a dry oil-free screw air compressor heat recovery management system according to the present invention;

[0016] Figure 3 This is a schematic diagram of heat exchanger b in a dry oil-free screw air compressor heat recovery management system according to the present invention.

[0017] Figure 4 This is a schematic diagram of heat exchanger c in a dry oil-free screw air compressor heat recovery management system according to the present invention;

[0018] Figure 5 This is a schematic diagram of heat exchanger d in a dry oil-free screw air compressor heat recovery management system according to the present invention.

[0019] The diagram is labeled as follows: 1. Cold side outlet; 2. Inlet; 3. Temperature sensor a; 4. Temperature sensor b; 5. Temperature sensor c; 6. Heat exchanger a; 7. Circulation pump; 8. Temperature sensor d; 10. Three-way PID proportional-integral valve; 11. Water inlet; 12. PID proportional-integral valve a; 13. Water collector a; 14. Heat exchanger b; 15. Cold side inlet; 16. Temperature sensor e; 17. Oil cooler; 18. Secondary cooler; 19. Primary cooler; 20. PID proportional-integral valve b; 21. Temperature sensor f; 22. Temperature sensor g; 23. PID proportional-integral valve c; 24. Temperature sensor h; 25. PID proportional-integral valve d. 26. Heat exchanger c; 27. PID proportional-integral valve f; 28. Temperature sensor i; 29. ​​Temperature sensor j; 30. Water collector b; 31. Water collector c; 32. Water collector d; 33. Heat exchanger d; 34. PID proportional-integral valve g; 35. Temperature sensor k; 36. Outlet; 601. Outlet a; 611. Inlet a; 602. Inlet b; 612. Outlet b; 141. Inlet c; 142. Outlet c; 143. Inlet d; 144. Outlet d; 261. Inlet e; 262. Outlet e; 263. Inlet f; 264. Outlet f; 331. Inlet g; 332. Outlet g; 333. Inlet h; 334. Outlet h. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention. Example 1

[0022] Please see Figure 1 , 23, 4, 5, A dry oil-free screw air compressor heat recovery management system, including heat exchanger A6, heat exchanger B14, heat exchanger C26 and heat exchanger D33. Heat exchanger A6 has an inlet A611 on the upper left side, an outlet A601 on the upper right side, and an outlet B612 on the lower left side. Heat exchanger B14 has inlets C141 and D143 on its upper left and right sides, respectively, and outlets C142 and D144 on its lower left and right sides, respectively. Heat exchanger C26 has outlets E262, F264, and inlet E263 on its upper, lower, left, and right sides. Heat exchanger d33 has outlets g332, h334, g331, and h333 on its top, bottom, left, and right sides. Heat exchanger a6 has inlet b602 on its lower right side, which is connected to outlets c142, d144, c141, and d143 via pipes. Inlet 2 is connected to inlet b602 by a temperature sensor c5. Outlet b612 is connected to outlet 36 via a pipe. Outlet b612 and outlet 36 are connected by a temperature sensor b4. Inlet a611 is connected to a three-way PID proportional-integral valve 10 via a pipe. The three-way PID proportional-integral valve 10 is connected to a circulation pump 7 via a pipe. The circulation pump 7 and the three-way PID proportional-integral valve 10 are connected by a temperature sensor d8. The three-way PID proportional-integral valve 10 and the temperature sensor d8 are connected to outlet a601. The circulation pump 7 is connected in parallel to a first-stage cooler 1 via a pipe. 9. Secondary cooler 18 and oil cooler 17. Oil cooler 17 is connected in series with PID proportional integral valve C23 and temperature sensor H24 via pipes. Temperature sensor H24 is connected to inlet D143 via pipes. Outlet D144 is connected to water collector A13 via pipes. The right end of water collector A13 is connected in series with PID proportional integral valve A12 and water inlet 11 via pipes. Water collector A13 is connected to three-way PID proportional integral valve 10 via pipes. Inlet C141 is connected to cold side water inlet 15 via pipes. Temperature sensor E16 is connected between cold side water inlet 15 and inlet C141.

[0023] Specifically, the temperature of the water collector a13 is regulated by heat exchanger a6 to facilitate water temperature adjustment; the drain pipe is regulated by three-way PID proportional-integral valve 10 to facilitate adjustment based on the opening and closing of the drain pipe; the circulating pump 7 provides power to ensure water flow; temperature sensors b4 and c5 detect the temperatures at the inlet 2 and outlet 36 for convenient water temperature monitoring; temperature sensor d8 detects the water temperature at the circulating pump 7 for convenient water temperature monitoring; water is replenished through the water inlet 11 for convenient water replenishment; the PID proportional-integral valve a12 controls the opening for convenient water replenishment; heat exchanger b14 facilitates heat absorption by the lubricating oil; and the oil cooler 17 cools the engine oil for convenient oil cooling. Example 2

[0024] Please see Figure 1 , 23, 4, 5, A dry oil-free screw air compressor heat recovery management system, including heat exchanger A6, heat exchanger B14, heat exchanger C26 and heat exchanger D33. Heat exchanger A6 has an inlet A611 on the upper left side, an outlet A601 on the upper right side, and an outlet B612 on the lower left side. Heat exchanger B14 has inlets C141 and D143 on its upper left and right sides respectively, and outlets C142 and D144 on its lower left and right sides respectively. Heat exchanger C26 has outlets E262 and F2 on its top, bottom, left, and right sides. 64. Inlet E261 and Inlet F263, outlet E262 and Outlet F264, inlet E261 and Inlet F263 correspond one-to-one with outlet C142, outlet D144, inlet C141 and Inlet D143. Heat exchanger D33 has outlets G332 and H334 on all sides, and inlet G331 and Inlet H333 on all sides. Outlet G332, Outlet H334, Inlet G331 and Inlet H333 correspond one-to-one with outlet C142, Outlet D144, Inlet C141 and Inlet D143. Outlet C142 is connected to water collector B30 through a pipe. Temperature sensor J29 is connected to water collector B30. Water collector B30 is connected to inlet E261 and inlet G331 via pipes. Inlet F263 is connected to secondary cooler 18 via pipes. Inlet H333 is connected to primary cooler 19 via pipes. Outlets H334 and F264 are both connected to water collector D32 via pipes. Water collector D32 is connected to inlet D143 via pipes. Outlets G332 and E262 are both connected to water collector C31 via pipes. Water collector C31 is connected to cold side outlet 1 via pipes. Cold side outlet 1 and water collector C31 are connected. Temperature sensor a3 is present. A PID proportional-integral valve b20 and a temperature sensor f21 are connected in series between the primary cooler 19 and the inlet h333. A PID proportional-integral valve d25 and a temperature sensor g22 are connected in series between the secondary cooler 18 and the inlet f263. PID proportional-integral valves f27 and g34 are connected to the water collector b30, respectively. Temperature sensors k35 and i28 are connected to the outlets g332 and e262, respectively, between the outlets c31 and the water collector c31.

[0025] Specifically, cooling is achieved through primary cooler 19 and secondary cooler 18 for convenient cooling. The outputs of primary cooler 19 and secondary cooler 18 are controlled by PID proportional-integral valves b20 and d25 for convenient control. Temperature data is detected by temperature sensors f21 and g22 for convenient temperature control. Heat exchange is achieved through heat exchangers c26 and d33 for convenient heat recovery. Water is collected by water collectors c31 and d32 for convenient water storage.

[0026] Working Principle: This invention discloses a heat recovery management system for a dry, oil-free screw air compressor. When needed, the outlet of the primary cooler 19 is technically modified and diverted. The water flow rate is independently adjusted via a PID proportional-integral valve b20, raising the water temperature. A temperature sensor f21 detects the water temperature, and the heated hot water enters the inlet h333 of heat exchanger d33. After absorbing heat from the cold-side medium water, it flows out from the outlet h334 and into the water collector d32. From the water collector d32, it connects to the PID proportional-integral valve c23 installed on the lubricating oil hot water outlet pipe, and simultaneously enters the inlet d143 of heat exchanger b14. The heat energy exchanges with the cold water at the inlet c141 and flows out from the outlet d14. 4. The water enters the collector a13, completing the first-stage heat recovery. The outlet of the second-stage cooler 18 undergoes a technical modification and diversion, with the water flow rate independently regulated by the PID proportional-integral valve d25. The water temperature passing through the PID proportional-integral valve d25 is increased, and the temperature sensor g22 detects the water temperature. The heated hot water enters the inlet f263 of the heat exchanger c26, where it absorbs heat from the cold-side medium water and flows out through the outlet f264, entering the collector d32. From the collector d32, it connects to the PID proportional-integral valve c23 installed on the lubricating oil hot water outlet pipe, and simultaneously enters the inlet d143 of the heat exchanger b14. After heat exchange with the cold water at the inlet c141, it enters the collector a13 through the outlet d144. At this point, the secondary heat recovery is complete. The outlet of oil cooler 17 is modified and diverted. The water flow rate is independently regulated via PID proportional-integral valve C23, raising the water temperature. Temperature sensor H24 detects the water temperature, and the heated hot water enters the inlet D143 of heat exchanger B14. After absorbing heat from the cold-side medium water, it flows out through outlet D144 and into collector A13. This completes the lubricating oil heat recovery. Having completed the primary, secondary, and hot-side lubricating oil cooling water heat recovery processes, the water simultaneously enters collector A13. A three-way PID proportional-integral valve 10 is installed at the outlet of collector A13, allowing the hot-side cooling water to enter the three-way PID proportional-integral valve from the outlet of collector A13. The integral valve 10 allows water to flow out from either inlet a611 or outlet a601. The specific channel depends on the temperature detected by temperature sensor d8. Inlet a611 connects to heat exchanger a6, which regulates the temperature at the outlet of water collector a13. When the outlet temperature of water collector a13 exceeds a set value, the hot-side cooling water from the outlet of water collector a13 will enter heat exchanger a6 through inlet a611 for cooling before entering circulating pump 7 from outlet a601. Circulating pump 7 then returns the hot-side cooling water to the main inlet pipe of the original cooling system of the dry oil-free screw air compressor. The water then flows out from the outlets of the primary cooler 19, secondary cooler 18, and oil cooler 17, completing one cycle.When the cold-side water initially enters heat exchanger B14 through inlet C141 from the cold-side inlet 15, absorbing the heat energy from the lubricating oil and the primary and secondary heat energy, it enters water collector B30 from outlet C142. Then, it flows into inlets G331 and E261 of heat exchangers D33 and C26 respectively, absorbing the initial primary and secondary heat energy. After absorbing the primary and secondary heat energy from heat exchangers D33 and C26, the water converges into water collector C31. The heat energy output from water collector C31 enters the user end, completing the heat energy recovery and utilization of the dry oil-free screw air compressor.

[0027] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat recovery management system for a dry oil-free screw air compressor, characterized in that: The heat exchanger includes heat exchanger a (6), heat exchanger b (14), heat exchanger c (26), and heat exchanger d (33). Heat exchanger a (6) has an inlet a (611) on its upper left side, an outlet a (601) on its upper right side, and an outlet b (612) on its lower left side. Heat exchanger b (14) has inlets d (143) and c (141) on its upper left and right sides, respectively. Heat exchanger b (14) has outlets d (144) and c (142) on its lower left and right sides, respectively. Heat exchanger c (26) has outlets f (264) and e (262) on its lower left and right sides, respectively. Heat exchanger c (26) has inlets f (264) and e (262) on its upper left and right sides, respectively. The outlets f (263) and e (261) are respectively connected. The outlets e (262), f (264), e (261) and f (263) correspond one-to-one with the outlets c (142), d (144), c (141) and d (143). The heat exchanger d (33) has outlets h (334) and g (332) on the left and right sides below. The heat exchanger d (33) has inlets h (333) and g (331) on the left and right sides above. The outlets g (332), h (334), g (331) and h (333) correspond one-to-one with the outlets c (142), d (144), c (141) and d (143). The heat exchanger a (6) has an inlet b (602) on its lower right side. The inlet a (611) is connected to a three-way PID proportional integral valve (10) via a pipe. The three-way PID proportional integral valve (10) is connected to a circulation pump (7) via a pipe. A temperature sensor d (8) is connected between the circulation pump (7) and the three-way PID proportional integral valve (10). An outlet a (601) is connected between the three-way PID proportional integral valve (10) and the temperature sensor d (8). The circulation pump (7) is connected to... A primary cooler (19), a secondary cooler (18), and an oil cooler (17) are connected in parallel via pipes. The oil cooler (17) is connected in series via pipes to a PID proportional-integral valve c (23) and a temperature sensor h (24). The temperature sensor h (24) is connected via pipes to an inlet d (143). The outlet d (144) is connected via pipes to a water collector a (13). The water collector a (13) is connected via pipes to a three-way PID proportional-integral valve (10). The inlet c (143) is connected via pipes to a water collector a (13). 1) A cold-side water inlet (15) is connected via a pipe. A temperature sensor e (16) is connected between the cold-side water inlet (15) and the inlet c (141). The outlet c (142) is connected via a pipe to a water collector b (30). A temperature sensor j (29) is connected to the water collector b (30). The water collector b (30) is connected via pipes to inlet e (261) and inlet g (331). The inlet f (263) is connected via a pipe to a secondary cooler (18). The inlet h (3) 33) A primary cooler (19) is connected by a pipe. The outlet h (334) and outlet f (264) are both connected by a water collector d (32) through a pipe. The water collector d (32) is connected by a pipe to an inlet d (143). The outlet g (332) and outlet e (262) are both connected by a water collector c (31) through a pipe. The water collector c (31) is connected by a cold side outlet (1) through a pipe. A temperature sensor a (3) is connected between the cold side outlet (1) and the water collector c (31). The right end of the water collector a (13) is connected in series with a PID proportional integral valve a (12) and a water inlet (11) via a pipe. The first-stage cooler (19) and the inlet h (333) are connected in series with a PID proportional integral valve b (20) and a temperature sensor f (21). The second-stage cooler (18) and the inlet f (263) are connected in series with a PID proportional integral valve d (25) and a temperature sensor g (22).

2. The dry oil-free screw air compressor heat recovery management system according to claim 1, characterized in that: The inlet b (602) is connected to the inlet (2) via a pipe, and a temperature sensor c (5) is connected between the inlet (2) and the inlet b (602). The outlet b (612) is connected to the outlet (36) via a pipe, and a temperature sensor b (4) is connected between the outlet b (612) and the outlet (36).

3. The dry oil-free screw air compressor heat recovery management system according to claim 1, characterized in that: The inlet e (261) and inlet g (331) are respectively connected to the water collector b (30) by PID proportional integral valve f (27) and PID proportional integral valve g (34), and the outlet g (332) and outlet e (262) are respectively connected to the water collector c (31) by temperature sensor k (35) and temperature sensor i (28).

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