Waste heat recovery air compressor unit

Abstract

An air compression main machine comprises a first air compression main machine body (5) and a second air compression main machine body (6), and the first air compression main machine body (5), a first water-cooling cooler (1), a second water-cooling cooler (2), the second air compression main machine body (6), a third water-cooling cooler (3) and a fourth water-cooling cooler (4) are sequentially connected in series in the airflow direction to compress and cool airflow. The first water cooler (1) and the third water cooler (3) are sequentially connected in series in the water flow direction to obtain first waste heat recovery hot water. A water outlet of the second water cooler (2) and a water outlet of the fourth water cooler (4) are connected in parallel to obtain second waste heat recovery hot water; according to the waste heat recovery air compressor unit, heat generated by the air compressor unit during working can be better recovered, and meanwhile supply of hot water at different temperatures is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, and particularly to a waste heat recovery air compressor unit. Background Art

[0002] An air compressor is a device that compresses air. A common main unit of an air compressor is a screw air compressor. During the operation of the air compressor, heat is generated when compressing air. Recycling this heat is beneficial for the full utilization of energy.

[0003] A plurality of air compressor main units connected in series and / or in parallel will form an air compressor unit. When the air compressor unit is working, more heat will be generated. Therefore, how to better recycle this heat and simultaneously realize the supply of hot water at different temperatures remains to be further studied. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and propose a waste heat recovery air compressor unit, which is beneficial to better recycle the heat generated during the operation of the air compressor unit and simultaneously realize the supply of hot water at different temperatures.

[0005] Compared with the prior art, the utility model proposes a waste heat recovery air compressor unit, which includes a plurality of air compressor main units. It is characterized in that it further includes a first water-cooled cooler, a second water-cooled cooler, a third water-cooled cooler and a fourth water-cooled cooler. The plurality of air compressor main units include a first air compressor main unit and a second air compressor main unit. The first air compressor main unit, the first water-cooled cooler, the second water-cooled cooler, the second air compressor main unit, the third water-cooled cooler and the fourth water-cooled cooler are connected in series in sequence along the air flow direction to compress and cool the air flow.

[0006] The first water-cooled cooler is connected to a water source. The cooling water of the water source enters from the first water-cooled cooler, and the first water-cooled cooler and the third water-cooled cooler are connected in series in sequence along the water flow direction to obtain first waste heat recovery hot water.

[0007] The second water-cooled cooler and the fourth water-cooled cooler are respectively connected to the water source. The cooling water of the water source respectively enters the second water-cooled cooler and the fourth water-cooled cooler, and the water outlets of the second water-cooled cooler and the fourth water-cooled cooler are connected in parallel to obtain second waste heat recovery hot water.

[0008] After adopting the above structure, compared with the prior art, the utility model has the following advantages:

[0009] Through improvement, the present disclosure separately cools the gas compressed by the first air compressor host and the gas compressed by the second air compressor host for heat recovery. The cooling water of the water source enters from the first water-cooled cooler, and the first water-cooled cooler and the third water-cooled cooler are serially connected in sequence along the water flow direction to obtain the first recovered waste heat hot water, thereby obtaining the first recovered waste heat hot water at a relatively high temperature. At the same time, the cooling water of the water source enters the second water-cooled cooler and the fourth water-cooled cooler respectively, and the water outlets of the second water-cooled cooler and the fourth water-cooled cooler are connected in parallel to obtain the second recovered waste heat hot water, thereby obtaining the second recovered waste heat hot water at a relatively low temperature.

[0010] In addition, since the cooling water of the water source enters the second water-cooled cooler and the fourth water-cooled cooler respectively, the second water-cooled cooler has a better temperature reduction effect on the gas entering the second air compressor host, which is beneficial to improving the compression efficiency of the second air compressor host. This is because the lower the temperature, the more free water can be precipitated, and the gas entering the compressor cavity of the air compressor host is drier. This is not only beneficial to improving the volumetric efficiency of the air compressor host, but also can reduce the material requirements for the rotor and the housing, which is beneficial to selecting ductile iron with higher cost performance. There is no need to worry about having to choose stainless steel material due to rotor rust and corrosion caused by gas containing water. The volumetric efficiency is improved because the inlet temperature is low, the overall temperature rise of the gas is small, and the expansion coefficient of the rotor is small, which is more conducive to maintaining a stable optimal clearance ratio between the rotors.

[0011] Similarly, the fourth water-cooled cooler has a better temperature reduction effect on the gas compressed by the second air compressor host, which is beneficial to raising the temperature of the compressed gas at a relatively low temperature. Or if an additional air compressor host, such as a third air compressor host, is added to the second air compressor host, then similarly, the fourth water-cooled cooler has a better temperature reduction effect on the gas entering the third air compressor host, which is beneficial to improving the compression efficiency of the third air compressor host.

[0012] As an improvement, it further includes a third air compressor host and a fifth water-cooled cooler. The first air compressor host, the first water-cooled cooler, the second water-cooled cooler, the second air compressor host, the third water-cooled cooler, the fourth water-cooled cooler, the third air compressor host and the fifth water-cooled cooler are serially connected in sequence along the gas flow direction to compress and cool the gas. The water inlet of the fifth water-cooled cooler is connected to the water source, and the water outlet of the fifth water-cooled cooler is connected in parallel with the aforementioned first recovered waste heat hot water to form a main pipe to supply hot water.

[0013] As an improvement, it further includes a first valve, a second valve and a cooling device. The first valve is arranged on the main pipe, the second valve is arranged between the main pipe and the cooling device, and the position where the second valve communicates with the main pipe is before the first valve. The first valve is used to close / regulate the main pipe to cut off the hot water supply, and the second valve is used to divert the hot water in the main pipe into the cooling device for cooling.

[0014] As an improvement, it further includes a first valve and a second valve. The first valve is provided on the main pipe, and the second valve is provided between the main pipe and the flow pipe of the second waste heat recovery hot water. Moreover, the position where the second valve communicates with the main pipe is before the first valve. The first valve is used to close / regulate the main pipe to cut off the hot water supply, and the second valve is used to divert the hot water in the main pipe into the flow pipe.

[0015] As an improvement, it further includes an oil cooler. The water inlet of the oil cooler is connected to a water source to draw water, and the water outlet of the oil cooler is connected to the flow pipe of the second waste heat recovery hot water. The hot water generated by the oil cooler is incorporated into the second waste heat recovery hot water.

[0016] As an improvement, it further includes a third valve and a cooling device. A third valve is provided between the flow pipe of the second waste heat recovery hot water and the cooling device. The third valve is used to divert the hot water in the flow pipe of the second waste heat recovery hot water into the cooling device for cooling.

[0017] As an improvement, the second water-cooled cooler is connected in series with the water source through a first valve, and the fourth water-cooled cooler is connected in series with the water source through a second valve.

[0018] As an improvement, both the first water-cooled cooler and the third water-cooled cooler adopt coarse coolers, and both the second water-cooled cooler and the fourth water-cooled cooler adopt fine coolers.

[0019] As an improvement, in the case where a fifth water-cooled cooler is further included, the fifth water-cooled cooler adopts a coarse cooler. Description of the Drawings

[0020] Figure 1 It is a schematic structural principle diagram of a waste heat recovery air compressor unit.

[0021] Description of the reference numerals: 1. First water-cooled cooler, 2. Second water-cooled cooler, 3. Third water-cooled cooler, 4. Fourth water-cooled cooler, 5. First air compressor main unit, 6. Second air compressor main unit, 7. Third air compressor main unit, 8. Main water inlet pipe, 9. Cooling water tank, 10. Main pipe, 11. Flow pipe, 12. Fifth water-cooled cooler, 13. First valve, 14. Second valve, 15. Oil cooler, 16. Fourth valve, 17. Fifth valve, 18. Oil tank. Detailed Embodiments

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present invention.

[0023] The following further describes the present utility model in detail:

[0024] As Figure 1 shown, a waste heat recovery air compressor unit proposed by the present disclosure includes, in this example, three screw air compressor main engines, namely a first air compressor main engine 5, a second air compressor main engine 6, and a third air compressor main engine 7. The first air compressor main engine 5, the second air compressor main engine 6, and the third air compressor main engine 7 are connected in series in sequence along the air flow compression direction, and air is compressed sequentially through the first air compressor main engine 5, the second air compressor main engine 6, and the third air compressor main engine 7.

[0025] The present disclosure further includes a first water-cooled cooler 1, a second water-cooled cooler 2, a third water-cooled cooler 3, and a fourth water-cooled cooler 4. The multiple air compressor main engines include the first air compressor main engine 5 and the second air compressor main engine 6. The first air compressor main engine 5, the first water-cooled cooler 1, the second water-cooled cooler 2, the second air compressor main engine 6, the third water-cooled cooler 3, and the fourth water-cooled cooler 4 are connected in series in sequence along the air flow direction to compress and cool the air flow.

[0026] The first water-cooled cooler 1 is connected to the main water inlet pipe 8 of the water source. The cooling water of the water source enters from the first water-cooled cooler 1, and the first water-cooled cooler 1 and the third water-cooled cooler 3 are connected in series in sequence along the water flow direction to obtain the first waste heat recovery hot water.

[0027] The second water-cooled cooler 2 and the fourth water-cooled cooler 4 are respectively connected to the main water inlet pipe 8 of the water source. The cooling water of the water source enters the second water-cooled cooler 2 and the fourth water-cooled cooler 4 respectively, and the water outlets of the second water-cooled cooler 2 and the fourth water-cooled cooler 4 are connected in parallel to obtain the second waste heat recovery hot water.

[0028] In some embodiments, it further includes a third air compressor main engine 7 and a fifth water-cooled cooler 12. The first air compressor main engine 5, the first water-cooled cooler 1, the second water-cooled cooler 2, the second air compressor main engine 6, the third water-cooled cooler 3, the fourth water-cooled cooler 4, the third air compressor main engine 7, and the fifth water-cooled cooler 12 are connected in series in sequence along the air flow direction to compress and cool the air flow. The water inlet of the fifth water-cooled cooler 12 is connected to the main water inlet pipe 8 of the water source, and the water outlet of the fifth water-cooled cooler 12 is connected in parallel with the first waste heat recovery hot water to form a main pipe 10 to provide hot water, that is Figure 1 shown to provide 60-degree waste heat recovery water. This is beneficial to obtaining hot water at a higher temperature.

[0029] In some embodiments, a first valve 13 and a second valve 14 are further included. The first valve 13 is arranged on the main pipe 10, and the second valve 14 is arranged between the main pipe 10 and the flow pipe 11 of the second recovered waste heat hot water. Moreover, the position where the second valve 14 communicates with the main pipe 10 is before the first valve 13. The first valve 13 is used to close / regulate the main pipe 10 to shut off the hot water supply, and the second valve 14 is used to divert the hot water in the main pipe 10 into the flow pipe 11. In this way, the first recovered waste heat hot water and the second recovered waste heat hot water can be connected.

[0030] Furthermore, an oil cooler 15 is further included. The water inlet of the oil cooler 15 is connected to a water source to draw water, and the water outlet of the oil cooler 15 is connected to the flow pipe 11 of the second recovered waste heat hot water. The hot water generated by the oil cooler 15 is incorporated into the second recovered waste heat hot water. The cooler 15 is used to cool the lubricating oil, and this lubricating oil is used to lubricate each air compressor main unit. After being cooled, the lubricating oil enters the oil tank 18, and the oil tank 18 pumps the lubricating oil to each air compressor main unit through an oil pump. Then, when each air compressor main unit is working, the lubricating oil will also absorb heat. According to this improvement, more comprehensive heat recovery can be achieved.

[0031] Furthermore, when hot water is not needed, a third valve and a cooling device are further included. A third valve is arranged between the flow pipe 11 of the second recovered waste heat hot water and the cooling device. The third valve is used to divert the hot water in the flow pipe 11 of the second recovered waste heat hot water into the cooling device for cooling. The cooling device is, for example, a cooling tower or a cooling pond or a cooling water tank 9.

[0032] Since the second valve 14 is used to divert the hot water in the main pipe 10 into the flow pipe 11, the hot water in the main pipe 10 is also diverted into the cooling device for cooling at the same time.

[0033] Of course, it can also be other structures. For example, when hot water is not needed, a first valve 13, a second valve 14 and a cooling device are further included. The first valve 13 is arranged on the main pipe 10, and the second valve 14 is arranged between the main pipe 10 and the cooling device. Moreover, the position where the second valve 14 communicates with the main pipe 10 is before the first valve 13. The first valve 13 is used to close / regulate the main pipe 10 to shut off the hot water supply, and the second valve 14 is used to divert the hot water in the main pipe 10 into the cooling device for cooling. That is to say, a separate path is provided to the cooling device for cooling.

[0034] In some embodiments, the second water-cooled cooler 2 is connected in series with a water source via a fourth valve 16, and the fourth water-cooled cooler 4 is connected in series with a water source via a fifth valve 17.

[0035] The working principle of the present disclosure can be referred to as follows. The cold water from the outside is controlled to have an outlet water temperature of 20 degrees through the cooling water tank 9 or the chiller (for example, the feedback signal detected by the temperature sensor is given to the compressor of the chiller to adjust the refrigerating capacity by frequency conversion). The 20-degree cold water enters the first water-cooled cooler 1, the second water-cooled cooler 2, the fourth water-cooled cooler 4, and the fifth water-cooled cooler 12 respectively from the inlet main pipe 8. The water with a temperature of about 40 degrees coming out of the first water-cooled cooler 1 all enters the third water-cooled cooler 3 to be heated again. For example, at this time, the exhaust temperature of the second air compressor main unit 6 is 150 degrees. The heat is recovered through the third water-cooled cooler 3 to make the water temperature reach about 50 degrees. The hot water at about 50 degrees converges with the hot water coming out of the fifth water-cooled cooler 12 into the waste heat recovery main pipe 10. For example, at this time, the exhaust temperature of the third air compressor main unit 7 is 170 degrees, and the hot water coming out of the fifth water-cooled cooler 12 reaches about 60 degrees. Thus, the hot water at about 50 degrees converges with the hot water at about 60 degrees and is output in the waste heat recovery main pipe 10. There are two-way valves distributed on the main pipe 10. The second valve 14 can be opened when the customer does not need hot water, so that the hot water returns to the circulation pipe 11. When the circulation pipe 11 is connected to the cooling water pool (i.e., the cooling device), then the hot water returns to the cooling water pool for cooling circulation. When the waste heat outlet temperature sensor detects that the temperature is lower than 50 degrees, the output hot water flow of the waste heat recovery main pipe 10 is adjusted to be smaller through the first valve 13 so that the output hot water temperature can reach above 50 degrees, thereby ensuring the hot water supply.

[0036] In the present disclosure, in order to better ensure the intake air temperature of the air inlet of the second air compressor main unit 6 and the air inlet of the second air compressor main unit 6, the second water-cooled cooler 2 and the water source are connected in series through the fourth valve 16, and the fourth water-cooled cooler 4 and the water source are connected in series through the fifth valve 17. The opening degrees of the fourth valve 16 and the fifth valve 17 are monitored and regulated through the air temperature sensor at the air inlet of the second air compressor main unit 6 and the air temperature sensor at the air inlet of the second air compressor main unit 6, so as to continuously supply hot water to the user while the present disclosure operates efficiently. Based on the above scheme, the present disclosure does not require an external waste heat recovery machine and connecting pipes, has a small overall floor area, a simple structure, and a low cost, and achieves the function of dual use of one machine.

[0037] The first valve 13 described above can be equipped with a waste heat outlet temperature sensor to form an automatic adjustment device, so as to automatically control and stably supply hot water automatically.

[0038] In some embodiments, both the first water-cooled cooler 1 and the third water-cooled cooler 3 adopt rough coolers, and both the second water-cooled cooler 2 and the fourth water-cooled cooler 4 adopt fine coolers. Specifically, the high-temperature gas is cooled in two stages. The stage from high temperature to medium temperature is a rough cooler, and the stage from medium temperature to normal temperature is a fine cooler.

[0039] In some embodiments, for the case where a fifth water-cooled cooler 12 is further included, the fifth water-cooled cooler 12 adopts a rough cooler to quickly discharge hot water.

[0040] The first water-cooled cooler 1, the second water-cooled cooler 2, the third water-cooled cooler 3, the fourth water-cooled cooler, and the fifth water-cooled cooler 12 can all adopt shell-and-tube coolers, that is, water flows through the shell of the shell-and-tube cooler, while air flows through the tubes of the shell-and-tube cooler, so as to conduct heat exchange in isolation from each other.

[0041] When understanding the present utility model, if necessary, the above structure can refer to other embodiments / attachments Figure 1 and it is understood that details are not described herein again.

[0042] The above are only illustrative embodiments of the present utility model. Therefore, all equivalent changes or modifications made according to the structures, features, and principles described in the protection scope of the present utility model patent are included in the protection scope of the present utility model patent.

Claims

1. A waste heat recovery air compressor unit, comprising a plurality of air compressor hosts, characterized in that: It also includes a first water-cooled cooler (1), a second water-cooled cooler (2), a third water-cooled cooler (3) and a fourth water-cooled cooler (4); the plurality of air compressor hosts include a first air compressor host (5) and a second air compressor host (6); the first air compressor host (5), the first water-cooled cooler (1), the second water-cooled cooler (2), the second air compressor host (6), the third water-cooled cooler (3) and the fourth water-cooled cooler (4) are connected in series in sequence along the air flow direction to compress and cool the air flow; The first water-cooled cooler (1) is connected to a water source, cooling water from the water source enters the first water-cooled cooler (1), and the first water-cooled cooler (1) and the third water-cooled cooler (3) are connected in series in sequence along the water flow direction to obtain first waste heat recovery hot water; The second water-cooled cooler (2) and the fourth water-cooled cooler (4) are respectively connected to a water source, and cooling water from the water source enters the second water-cooled cooler (2) and the fourth water-cooled cooler (4) respectively, and the water outlet of the second water-cooled cooler (2) and the water outlet of the fourth water-cooled cooler (4) are connected in parallel to obtain second waste heat recovery hot water.

2. A waste heat recovery air compressor unit according to claim 1, characterized in that: It also includes a third air compressor main unit (7) and a fifth water-cooled cooler (12). The first air compressor main unit (5), the first water-cooled cooler (1), the second water-cooled cooler (2), the second air compressor main unit (6), the third water-cooled cooler (3), the fourth water-cooled cooler (4), the third air compressor main unit (7) and the fifth water-cooled cooler (12) are connected in series in sequence along the air flow direction to compress and cool the air flow. The water inlet of the fifth water-cooled cooler (12) is connected to a water source, and the water outlet of the fifth water-cooled cooler (12) is connected in parallel with the first waste heat recovery hot water to form a main pipe (10) to provide hot water.

3. A waste heat recovery air compressor unit according to claim 2, characterized in that: The invention also comprises a first valve (13), a second valve (14) and a cooling device, wherein the first valve (13) is arranged on the main pipe (10), the second valve (14) is arranged between the main pipe (10) and the cooling device, and the position where the second valve (14) is connected to the main pipe (10) is located before the first valve (13), the first valve (13) is used to close / adjust the flow of the main pipe (10) to close / adjust the hot water supply, and the second valve (14) is used to guide the hot water in the main pipe (10) into the cooling device for cooling.

4. The waste heat recovery air compressor unit according to claim 2, characterized in that: The invention also comprises a first valve (13) and a second valve (14), wherein the first valve (13) is arranged on the main pipe (10), and the second valve (14) is arranged between the main pipe (10) and a circulation pipe (11) for second waste heat recovery hot water, and the position where the second valve (14) is connected to the main pipe (10) is located before the first valve (13), the first valve (13) is used to close / adjust the main pipe (10) to close the hot water supply, and the second valve (14) is used to guide the hot water in the main pipe (10) into the circulation pipe (11).

5. The waste heat recovery air compressor unit according to claim 4, characterized in that: It also includes an oil cooler (15), the water inlet of the oil cooler (15) is connected to a water source to take water, the water outlet of the oil cooler (15) is connected to a circulation pipe (11) of a second waste heat recovery hot water, and the hot water generated by the oil cooler (15) flows into the second waste heat recovery hot water.

6. A waste heat recovery air compressor unit according to claim 1, 4 or 5, characterized in that: It also includes a third valve and a cooling device. The third valve is arranged between the second waste heat recovery hot water circulation pipe (11) and the cooling device. The third valve is used to guide the hot water in the second waste heat recovery hot water circulation pipe (11) into the cooling device for cooling.

7. The waste heat recovery air compressor unit according to claim 1, characterized in that: The second water-cooled cooler (2) is connected in series with the water source via a fourth valve (16), and the fourth water-cooled cooler (4) is connected in series with the water source via a fifth valve (17).

8. A waste heat recovery air compressor unit according to claim 1 or 2, characterized in that: The first water-cooled cooler (1) and the third water-cooled cooler (3) both use rough coolers, and the second water-cooled cooler (2) and the fourth water-cooled cooler (4) both use fine coolers.

9. The waste heat recovery air compressor unit according to claim 8, characterized in that: In the case where a fifth water-cooled cooler (12) is further included, the fifth water-cooled cooler (12) is a rough cooler.

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