Waste heat recovery device of centrifugal compressor

Abstract

The utility model discloses a waste heat recovery device of a centrifugal compressor. Comprising a hot water pipeline, a cold water pipeline, a water return pipeline, a cooling water tank, a heating plate heat exchanger and a supportability plate heat exchanger, the cold water pipeline and the hot water pipeline are respectively connected with a heat exchanger of the centrifugal compressor, the cold water pipeline is connected with the cooling water tank, and cold water and compressed air complete heat exchange in the heat exchanger; the hot water pipeline is connected with the heating plate type heat exchanger, and hot water and water to be heated complete heat exchange in the heating plate type heat exchanger; the water return pipeline comprises a front section and a rear section, the heating plate type heat exchanger is connected with the supportability plate type heat exchanger through the front section, the supportability plate type heat exchanger is connected with the water tank through the rear section, and return water and cooling media complete heat exchange in the supportability plate type heat exchanger. Waste heat is recovered through the waste heat recovery device, waste of a large amount of heat is avoided, energy is saved, and production cost is reduced.

Description

Technical Field:

[0001] The utility model belongs to the technical field of centrifugal compressors, and particularly relates to a waste heat recovery device for a centrifugal compressor. Background Art:

[0002] When a centrifugal compressor operates, a large amount of heat is generated. In order to ensure the normal and stable operation of the centrifugal compressor equipment, the heat generated during the operation of the centrifugal compressor needs to be discharged. In the existing production process, an open cooling water tower is generally used to discharge the heat into the external atmosphere. This treatment causes a large amount of heat waste and increases the production cost.

[0003] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model:

[0004] The purpose of the present utility model is to provide a waste heat recovery device for a centrifugal compressor, thereby overcoming the defects in the above-mentioned prior art.

[0005] To achieve the above purpose, the present utility model provides a waste heat recovery device for a centrifugal compressor, including a hot water pipeline, a cold water pipeline, a return water pipeline, a water tank, a heating plate heat exchanger, and a safeguard plate heat exchanger; the cold water pipeline and the hot water pipeline are respectively connected to the heat exchanger of the centrifugal compressor, the cold water pipeline is connected to the cold water tank, and cold water and compressed air complete heat exchange in the heat exchanger; the hot water pipeline is connected to the heating plate heat exchanger, and hot water completes heat exchange in the heating plate heat exchanger; the return water pipeline includes a front section and a rear section, the heating plate heat exchanger and the safeguard plate heat exchanger are connected through the front section, and the safeguard plate heat exchanger and the cooling water tank are connected through the rear section, and the return water and the cooling medium complete heat exchange in the safeguard plate heat exchanger; the hot water pipeline, the heating plate heat exchanger, the front section, the safeguard plate heat exchanger, the rear section, the cooling water tank, and the cold water pipeline form a cooling water waste heat recovery channel; in the waste heat recovery channel, the cooling water temperatures in the rear section, the cooling water tank, and the cold water pipeline are the same.

[0006] Preferably, in the technical solution, temperature sensors and pressure sensors are arranged on both the hot water pipeline and the cold water pipeline.

[0007] Preferably, in the technical solution, temperature sensors are arranged on both the front section and the rear section of the return water pipeline.

[0008] Preferably, in the technical solution, a corresponding hot water pipeline and cold water pipeline are arranged for each stage of the multi-stage centrifugal compressor.

[0009] Preferably, in the technical solution, a liquid level switch and a water replenishing port are arranged in the cooling water tank.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] By setting up a waste heat recovery device, cold water will recover heat in the compressor heat exchanger, and the cold water will be heated by a heating plate heat exchanger to meet the temperature requirements of the recovered hot water. When the heating plate heat exchanger is not working, heat exchange can also be carried out with the cooling medium through the safeguard plate heat exchanger to ensure that the return water temperature does not exceed 36°C and ensure the heat exchange efficiency in the centrifugal compressor. The waste heat recovery device recovers waste heat, avoids waste of a large amount of heat, saves energy, and reduces production costs. Description of the drawings:

[0012] Figure 1 It is a schematic structural diagram of the waste heat recovery device for the centrifugal compressor of the utility model. Specific implementation manners:

[0013] The following will describe in detail the specific implementation manners of the utility model, but it should be understood that the protection scope of the utility model is not limited by the specific implementation manners.

[0014] Unless otherwise clearly stated, throughout the specification and claims, the term "comprise" or its variations such as "comprises" or "including" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0015] As Figure 1 shown, a waste heat recovery device for a centrifugal compressor includes a hot water pipeline 1, a cold water pipeline 2, a return water pipeline, a cooling water tank 5, a heating plate heat exchanger 6, and a safeguard plate heat exchanger 7; the cold water pipeline 2 and the hot water pipeline 1 are respectively connected to the heat exchanger of the centrifugal compressor 8, the cold water pipeline 2 is connected to the cooling water tank 5, a liquid level switch and a water replenishing port are arranged in the cooling water tank 5, and each stage of the heat exchanger of the centrifugal compressor 8 is provided with a corresponding hot water pipeline 1 and a cold water pipeline 2, and heat exchange between the cooling water and the compressed air is completed in the heat exchanger; the hot water pipeline 1 is connected to the heating plate heat exchanger 6, and heat exchange between the hot water and the cold water is completed in the heating plate heat exchanger 6; the return water pipeline includes a front section 3 and a rear section 4, the heating plate heat exchanger 6 and the safeguard plate heat exchanger 7 are connected through the front section 3, and the safeguard plate heat exchanger 7 and the cooling water tank 5 are connected through the rear section 4, and heat exchange between the return water and the cooling medium is completed in the safeguard plate heat exchanger 7; the hot water pipeline 1, the heating plate heat exchanger 6, the front section 3, the safeguard plate heat exchanger 7, the rear section 4, the cooling water tank 5, and the cold water pipeline 2 form a cooling water waste heat recovery channel. The heating plate heat exchanger 6 and the safeguard plate heat exchanger 7 are one in use and one in reserve.

[0016] A variable frequency constant pressure water pump 9 is provided on the cold water pipeline 2. A temperature sensor TB1 and a pressure sensor PB1 are provided on the cold water pipeline in front of the variable frequency constant pressure water pump 9. The outlet of the cold water pipeline 2 is divided into a primary cold water branch pipe and a secondary cold water branch pipe. A temperature sensor TW11 and a pressure sensor PW11 are provided on the primary cold water branch pipe, and a temperature sensor TW13 and a pressure sensor PW13 are provided on the secondary cold water branch pipe. The inlet of the hot water pipeline is divided into a primary hot water branch pipe and a secondary hot water branch pipe. A temperature sensor TW12 and a pressure sensor PW12 are provided on the primary hot water branch pipe, and a temperature sensor TW14 and a pressure sensor PW14 are provided on the secondary hot water branch pipe. A temperature sensor TB2 and a pressure sensor PB2 are provided at the outlet of the hot water pipeline. A temperature sensor TB3 is provided in the front section of the return water pipeline, and a temperature sensor TB4 is provided in the rear section.

[0017] When the centrifugal compressor 8 operates, air is inhaled. The air passes through a self-cleaning air filter during the process of entering the centrifugal compressor. The variable frequency constant pressure water pump 9 pumps the 36°C cooling water in the cooling water tank 5 into the centrifugal compressor heat exchanger through the cold water pipeline 2. In the heat exchanger, the 36°C cooling water exchanges heat with the high-temperature compressed gas. The low-temperature compressed gas after heat exchange is discharged from the centrifugal compressor to the gas-using end, and the cooling water is heated to a certain temperature.

[0018] The cooling water enters the heating plate heat exchanger 6 through the hot water pipeline 1. When hot water is used, the low-temperature water to be heated enters the heating plate heat exchanger 6. In the heating plate heat exchanger 6, the low-temperature water exchanges heat with the high-temperature water. The cold water is heated to a certain temperature before use, and the temperature of the cooling water is reduced to 36°C. The 36°C cooling water flows back to the cooling water tank 5 through the front section 3, the safeguard plate heat exchanger 7, and the rear section 4. When the heat is not used, the hot water produced by the compressor enters the safeguard plate heat exchanger 7 through the heating plate heat exchanger 6 and the front section 3. The 32°C cooling medium in the external cooling water tower enters the safeguard plate heat exchanger 7. In the safeguard plate heat exchanger 7, the 32°C cooling medium exchanges heat with the heat. The cooling medium is heated to 40°C for return use, and the cooling water is cooled to 36°C. The cooling water flows back to the cooling water tank 5 through the rear section 4.

[0019] Through the waste heat recovery device, the heat in the cooling water after heat exchange can be recovered. The water to be heated is heated through the heating plate heat exchanger to meet the temperature requirements. When the heat is not used, it can also exchange heat with the cooling medium through the safeguard plate heat exchanger to ensure that the return water temperature does not exceed 36°C and ensure the heat exchange efficiency in the centrifugal compressor. The waste heat is recovered through the waste heat recovery device, avoiding a large amount of heat waste, saving energy, and reducing production costs.

[0020] The foregoing description of the specific exemplary embodiments of the present utility model is for purposes of illustration and exemplification. These descriptions are not intended to limit the present utility model to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present utility model and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the present utility model, as well as various different selections and changes. The scope of the present utility model is intended to be defined by the claims and their equivalents.

Claims

1. A waste heat recovery device for a centrifugal compressor, characterized in that: It includes a hot water pipeline, a cold water pipeline, a return water pipeline, a water tank, a heating plate heat exchanger, and a safeguard plate heat exchanger; the cold water pipeline and the hot water pipeline are respectively connected to the heat exchanger of the centrifugal compressor, the cold water pipeline is connected to the water tank, and cold water and compressed air complete heat exchange in the heat exchanger; the hot water pipeline is connected to the heating plate heat exchanger, and hot water and water to be heated complete heat exchange in the heating plate heat exchanger; the return water pipeline includes a front section and a rear section, the heating plate heat exchanger and the safeguard plate heat exchanger are connected through the front section, and the safeguard plate heat exchanger and the water tank are connected through the rear section, and return water and a cooling medium complete heat exchange in the safeguard plate heat exchanger; The hot water pipeline, the heating plate heat exchanger, the front section, the safeguard plate heat exchanger, the rear section, the water tank, and the cold water pipeline form a cold water waste heat recovery channel; in the waste heat recovery channel, the water temperatures in the rear section, the water tank, and the cold water pipeline are the same.

2. The waste heat recovery device of the centrifugal compressor according to claim 1, characterized in that: Temperature sensors and pressure sensors are both provided on the hot water pipeline and the cold water pipeline.

3. The waste heat recovery device of the centrifugal compressor according to claim 1, characterized in that: Temperature sensors are provided on both the front section and the rear section of the return water pipeline.

4. The waste heat recovery device of a centrifugal compressor according to claim 1, characterized in that: Each stage of the multi-stage centrifugal compressor can be provided with a corresponding hot water pipeline and a cold water pipeline.

5. The waste heat recovery device of a centrifugal compressor according to claim 1, characterized in that: A liquid level switch and a water replenishing port are provided in the cooling water tank.

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